Table of Contents

 
 
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
____________________________________________________________________________________________________________________________
Form 10-K
(Mark One)
xANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the fiscal year ended December 31, 20172018
OR
oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from          to
Commission File Number 1-13232 (Apartment Investment and Management Company)
Commission File Number 0-24497 (AIMCO Properties, L.P.)
 
Apartment Investment and Management Company
AIMCO Properties, L.P.
(Exact name of registrant as specified in its charter)
Maryland (Apartment Investment and Management Company) 84-1259577 
Delaware (AIMCO Properties, L.P.) 84-1275621 
(State or other jurisdiction of
incorporation or organization)
 
(I.R.S. Employer
Identification No.)
 
    
4582 South Ulster Street, Suite 1100   
Denver, Colorado 80237 
(Address of principal executive offices) (Zip Code) 
(303) 757-8101
(Registrant’s telephone number, including area code)
Securities registered pursuant to Section 12(b) of the Act:
 
Title of Each Class  Name of Each Exchange on Which Registered 
Class A Common Stock (Apartment Investment and Management Company) New York Stock Exchange 
Class A Cumulative Preferred Stock (Apartment Investment and Management Company) New York Stock Exchange 
    
Securities registered pursuant to Section 12(g) of the Act:
  
None (Apartment Investment and Management Company)
Partnership Common Units (AIMCO Properties, L.P.)
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined by Rule 405 of the Securities Act.
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.
 
Apartment Investment and Management Company: Yes o    No x
AIMCO Properties, L.P.: Yes o    No x
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).
 
Apartment Investment and Management Company: Yes x    No o
AIMCO Properties, L.P.: Yes x    No o
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.
 
Apartment Investment and Management Company: Yes ox     No xo
AIMCO Properties, L.P.: Yes x    No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “non-accelerated filer”“smaller reporting company,” and “smaller reporting“emerging growth company” in Rule 12b-2 of the Exchange Act.
 
Apartment Investment and Management Company:
 Large accelerated filerx Accelerated filero
 Non-accelerated filero(Do not check if a smaller reporting company)Smaller reporting companyo
    Emerging growth companyo
      
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o
 
AIMCO Properties, L.P.:
 Large accelerated filero Accelerated filerx
 Non-accelerated filero(Do not check if a smaller reporting company)Smaller reporting companyo
    Emerging growth companyo
      
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
Apartment Investment and Management Company: o
AIMCO Properties, L.P.: o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).
 
Apartment Investment and Management Company: Yes o    No x
AIMCO Properties, L.P.: Yes o    No x
The aggregate market value of the voting and non-voting common stock of Apartment Investment and Management Company held by non-affiliates of Apartment Investment and Management Company was approximately $6.7$6.6 billion as of June 30, 2017.2018. As of February 27, 2018,15, 2019, there were 157,330,262148,766,616 shares of Class A Common Stock outstanding.
As of February 27, 2018,15, 2019, there were 164,901,915158,495,487 Partnership Common Units outstanding.
_______________________________________________________
Documents Incorporated by Reference
Portions of Apartment Investment and Management Company’s definitive proxy statement to be issued in conjunction with Apartment Investment and Management Company’s annual meeting of stockholders to be held May 1, 2018,April 30, 2019, are incorporated by reference into Part III of this Annual Report.
 

EXPLANATORY NOTE
This filing combines the Annual Reports on Form 10-K for the fiscal year ended December 31, 2017,2018, of Apartment Investment and Management Company, or Aimco, and AIMCO Properties, L.P., or the Aimco Operating Partnership. Where it is important to distinguish between the two entities, we refer to them specifically. Otherwise, references to “we,” “us” or “our” mean collectively Aimco, the Aimco Operating Partnership and their consolidated entities.
Aimco, a Maryland corporation, is a self-administered and self-managed real estate investment trust, or REIT. Aimco, through wholly-owned subsidiaries, is the general and special limited partner of and, as of December 31, 2017,2018, owned a 95.5%94.3% ownership interest in the common partnership units of, the Aimco Operating Partnership. The remaining 4.5%5.7% interest is owned by limited partners. As the sole general partner of the Aimco Operating Partnership, Aimco has exclusive control of the Aimco Operating Partnership’s day-to-day management.
The Aimco Operating Partnership holds all of Aimco’s assets and manages the daily operations of Aimco’s business. Pursuant to the Aimco Operating Partnership agreement, Aimco is required to contribute to the Aimco Operating Partnership any assets, which it may acquire including all proceeds from the offerings of its securities. In exchange for the contribution of these assets, Aimco receives additional interests in the Aimco Operating Partnership with similar terms (e.g., if Aimco contributes proceeds of a stock offering, Aimco receives partnership units with terms substantially similar to the stock issued by Aimco).
We believe combining the periodic reports of Aimco and the Aimco Operating Partnership into this single report provides the following benefits:
We present our business as a whole, in the same manner our management views and operates the business;
We eliminate duplicative disclosure and provide a more streamlined and readable presentation because a substantial portion of the disclosures apply to both Aimco and the Aimco Operating Partnership; and
We save time and cost through the preparation of a single combined report rather than two separate reports.
We operate Aimco and the Aimco Operating Partnership as one enterprise, the management of Aimco directs the management and operations of the Aimco Operating Partnership, and the members of the Board of Directors of Aimco are identical to those of the Aimco Operating Partnership.Partnership’s general partner.
We believe it is important to understand the few differences between Aimco and the Aimco Operating Partnership in the context of how Aimco and the Aimco Operating Partnership operate as a consolidated company. Aimco has no assets or liabilities other than its investment in the Aimco Operating Partnership. Also, Aimco is a corporation that issues publicly traded equity from time to time, whereas the Aimco Operating Partnership is a partnership that has no publicly traded equity. Except for the net proceeds from stock offerings by Aimco, which are contributed to the Aimco Operating Partnership in exchange for additional limited partnership interests (of a similar type and in an amount equal to the shares of stock sold in the offering), the Aimco Operating Partnership generates all remaining capital required by its business. These sources include the Aimco Operating Partnership’s working capital, net cash provided by operating activities, borrowings under its revolving credit facility, the issuance of debt and equity securities, including additional partnership units, and proceeds received from the sale of apartment communities.
Equity, partners’ capital and noncontrolling interests are the main areas of difference between the consolidated financial statements of Aimco and those of the Aimco Operating Partnership. Interests in the Aimco Operating Partnership held by entities other than Aimco, which we refer to as OP Units, are classified within partners’ capital in the Aimco Operating Partnership’s financial statements and as noncontrolling interests in Aimco’s financial statements.
To help investors understand the differences between Aimco and the Aimco Operating Partnership, this report provides separate consolidated financial statements for Aimco and the Aimco Operating Partnership; a single set of consolidated notes to such financial statements that includes separate discussions of each entity’s stockholders’ equity or partners’ capital, as applicable; and a combined Management’s Discussion and Analysis of Financial Condition and Results of Operations section that includes discrete information related to each entity.
This report also includes separate Part II, Item 9A. Controls and Procedures sections and separate Exhibits 31 and 32 certifications for Aimco and the Aimco Operating Partnership in order to establish that the requisite certifications have been made and that Aimco and the Aimco Operating Partnership are both compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and 18 U.S.C. §1350.


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
TABLE OF CONTENTS
ANNUAL REPORT ON FORM 10-K
For the Fiscal Year Ended December 31, 20172018
  
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FORWARD-LOOKING STATEMENTS
The Private Securities Litigation Reform Act of 1995 provides a “safe harbor” for forward-looking statements in certain circumstances. Certain information included in this Annual Report contains or may contain information that is forward-looking, within the meaning of the federal securities laws, including, without limitation, statements regarding: our ability to maintain current or meet projected occupancy, rental ratesrate and property operating results; the effect of acquisitions, dispositions, redevelopments and developments; our ability to meet budgeted costs and timelines, and achieve budgeted rental rates related to our redevelopment and development investments; expectations regarding sales of our apartment communities and the use of proceeds thereof; and our ability to comply with debt covenants, including financial coverage ratios.
Actual results may differ materially from those described in these forward-looking statements and, in addition, will be affected by a variety of risks and factors, some of which are beyond our control, including, without limitation:
Real estate and operating risks, including fluctuations in real estate values and the general economic climate in the markets in which we operate and competition for residents in such markets; national and local economic conditions, including the pace of job growth and the level of unemployment; the amount, location and quality of competitive new housing supply; the timing of acquisitions, dispositions, redevelopments and developments; and changes in operating costs, including energy costs;
Financing risks, including the availability and cost of capital markets’ financing; the risk that our cash flows from operations may be insufficient to meet required payments of principal and interest; and the risk that our earnings may not be sufficient to maintain compliance with debt covenants;
Insurance risks, including the cost of insurance, natural disasters and severe weather such as hurricanes; and
Legal and regulatory risks, including costs associated with prosecuting or defending claims and any adverse outcomes; the terms of governmental regulations that affect us and interpretations of those regulations; and possible environmental liabilities, including costs, fines or penalties that may be incurred due to necessary remediation of contamination of apartment communities presently or previously owned by us.
In addition, our current and continuing qualification as a real estate investment trust involves the application of highly technical and complex provisions of the Internal Revenue Code and depends on our ability to meet the various requirements imposed by the Internal Revenue Code, through actual operating results, distribution levels and diversity of stock ownership.
Readers should carefully review our financial statements and the notes thereto, as well as the section entitled “Risk Factors” described in Item 1A of this Annual Report and the other documents we file from time to time with the Securities and Exchange Commission.
As used herein and except as the context otherwise requires, “we,” “our” and “us” refer to Apartment Investment and Management Company (which we refer to as Aimco), AIMCO Properties, L.P. (which we refer to as the Aimco Operating Partnership) and their consolidated entities, collectively.
Certain financial and operating measures found herein and used by management are not defined under accounting principles generally accepted in the United States, or GAAP. These measures are defined and reconciled to the most comparable GAAP measures under the Non-GAAP Measures heading and include: Funds From Operations, Pro forma Funds From Operations, Adjusted Funds From Operations, Free Cash Flow, Net Asset Value, Economic Income, and the measures used to compute our leverage ratios.
PART I

Item 1. Business
The Company
Apartment Investment and Management Company, or Aimco, is a Maryland corporation incorporated on January 10, 1994. Aimco is a self-administered and self-managed real estate investment trust, or REIT, focused on the ownership, management, redevelopment and limited development of quality apartment communities located in some of the largest markets in the United States.

Aimco, through its wholly-owned subsidiaries, AIMCO-GP, Inc. and AIMCO-LP Trust, owns a majority of the ownership interests in AIMCO Properties, L.P., or the Aimco Operating Partnership, a Delaware limited partnership formed on May 16, 1994. Aimco conducts all of its business and owns all of its assets through the Aimco Operating Partnership.
As of December 31, 2017, we had ownership interests in 182 apartment communities with 43,802 apartment homes.
Business Overview
Our business activities are defined by a commitment to our core values of integrity, respect, collaboration, performance and a focus on our customers. These values and our corporate mission, “to consistently provide quality apartment homes in a respectful environment delivered by a team of people who care,” shape our culture. In all of our interactions with residents, team members, business partners, lenders, and equity holders, we aim to be the best owner and operator of apartment communities and an outstanding corporate citizen.

Our principal financial objective is to provide predictable and attractive returns to our equity holders. We measure our currentlong- term total return using Economic Income, defined as Net Asset Value, or NAV, growth plus dividends. NAV is used by many investors because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors, enhancing comparability among companies that have differences in their accounting, and avoiding disparity that can result from application of GAAP to investment properties and various ownership structures. Some investors focus on multiples of Adjusted Funds From Operations, or AFFO, and Funds From Operations, FFO. Our disclosure of AFFO, a measure of current return, complements our long-term return usingfocus on Economic Income. We also use Pro forma Funds From Operations, or Pro forma FFO, as a secondary measure of operational performance. Over the past five years, we have generated Economic Income (eachat a compounded annual return of which are defined under the Non-GAAP Measures heading in Item 7)11.5%. Our business plan to achieve this principal financial objective is to:
operate our portfolio of desirable apartment homes with a high level of focus on customer selection and customer satisfaction and in an efficient manner that produces predictable and growing Free Cash Flow, which is defined under the Operational Excellence heading, below;Flow;
improve our portfolio of apartment communities, which is diversified both by geography and by price point by selling apartment communities with lower projected free cash flowFree Cash Flow internal rates of return and investing the proceeds from such sales through capital enhancements, redevelopment, limited development, and acquisitions with greater land value, higher expected rent growth, and projected free cash flowFree Cash Flow internal rates of return in excess of those expected from the communities sold;
use low levels of financial leverage primarily in the form of non-recourse, long-dated, fixed-rate property debt and perpetual preferred equity, a combination whichthat reduces our refunding and re-pricing risk and which provides a hedge against increases in interest rates; and
focus intentionally on a collaborative and productive culture based on respect for others and personal responsibility.
Our business is organized around five areas of strategic focus: operational excellence; redevelopment; portfolio management; balance sheet; and team and culture. Our areas of strategic focus are described in more detail below. Recent accomplishments in the execution of such strategies are discussed in the Executive Overview in Item 7.
Operational Excellence
We own and operate a portfolio of market rate apartment communities, diversified by both geography and price point, which we refer to as our Real Estate portfolio. At December 31, 2017,2018, our Real Estate portfolio included 136134 apartment communities with 36,90436,549 apartment homes in which we held an average ownership of approximately 99%. This portfolio was divided about two thirds by value to our “Same Store” portfolio of stabilized apartment communities and about one third by value to “Other Real Estate,” which includes recently acquired communities and communities under redevelopment or development whose long-term financial contribution is not yet stabilized.
We also held nominal ownership positions in partnerships that own 46 low-income housing tax credit apartment communities with 6,898 apartment homes. We provide services to these partnerships and receive fees and other payments in return. Our relationship with these partnerships is different than real estate ownership and is better described as an asset management business, or Asset Management.
To manage our property operations efficiently and to increase the benefits from our local management expertise, we give direct responsibility for operations within each area to area operations leaders with regular oversight by senior management. To enable the area operations leaders to focus on sales and service, as well as to improve financial control and budgeting, we have dedicated area financial officers who support the operations leaders. Additionally, with the exception of routine maintenance and purchases and installation of equipment, we have specialized teams that manage capital spending related to larger and more complicated construction.
We seek to improve our property operations by: employing service-oriented, well-trained team members; taking advantage of advances in technology; centralizing operational tasks where efficient to do so; standardizing business processes, operational measurements, and internal reporting; and enhancing financial controls over field operations. We focus on the following areas:

Customer Satisfaction. Our operating culture is focused on our residents and providing them with a high level of service in a clean, safe, and respectful living environment. We regularly monitor and evaluate our performance by providing customers with numerous opportunities to grade our work. In 2017,2018, we received 84,00078,000 customer grades averaging 4.25 on a five-point scale. We use this customer feedback as a daily management tool. We also publish on-line these customer evaluations as important and credible information for prospective customers. We have automated certain aspects of our on-site operations to enable current and future residents to interact with us using methods that are efficient and effective for them, such as making on-line requests for service work and executing leases and lease renewals on-line. In addition, we emphasize the quality of our on-site team members through recruiting, training and retention programs, which, with the continuous and real-time customer feedback, contributes to improved customer service. We believe that greater customer satisfaction leads to higher resident retention and increased occupancy rates, which in turn leads to increased revenue and reduced costs.
Resident Selection and Retention. In our apartment communities, we believe that one’s neighbors are a meaningful part of the customer experience, together with the location of the community and the physical quality of the apartment homes.

Part of our property operations strategy is to focus on attracting and retaining stable, credit-worthy residents who are also good neighbors. We have explicit criteria for resident selection, which we apply to new leases and to renewal leases, including creditworthiness and behavior in accordance with our community standards and our written “Good Neighbor Commitment.” Our focus on resident selection and retention led to 53%54% of expiring leases being renewed in 2017, which is above peer average.2018, the highest result we have yet achieved.
Revenue Management and Ancillary Services. We have a centralized revenue management system that leverages people, processes and technology to work in partnership with our local property management teams to develop rental rate pricing. We seek to increase Free Cash Flow, which we define as net operating income less Capital Replacements, by optimizing the balance between rental and occupancy rates, as well as taking into consideration costs such as preparing an apartment home for a new resident. We are focused on careful measurements of on-site operations, as we believe that timely and accurate collection of apartment community performance and resident profile data will enableallows us to maximize Free Cash Flow through better property management and leasing decisions. We seek to maximize profit by performing timely data analysis of new and renewal pricing for each apartment home, thereby enabling us to adjust rents quickly in response to changes in supply and demand and minimize vacancy time. We also generate incremental revenue by providing or facilitating the provision of services to our residents, including, at certain apartment communities, telecommunications services, parking options, package lockers and storage space rental.
Controlling Expenses. Innovation is the foundation of our cost control efforts. Innovative activities we have undertaken include: moving administrative tasks to our shared service center, which reduces costs and allows site teams to focus on sales and service; taking advantage of economies of scale at the corporate level, through electronic procurement which reduces complexity and increases purchasing volume discounts; focusing on life cycle costs by investing in more durable, longer-lived materials, which reduce turn times and costs; and leveraging technology to enhance the customer experience through such items as website design and package lockers, which meet today’s customer preference for self-service. For the year ended December 31, 2017 comparedThese and other innovations contributed to 2016, Same Store property operating expenses increased by 0.7%. Same Storea growth rate in controllable operating expenses,expense, which we define as property operating expenses excludingless taxes, insurance and utility expenses, decreased by 1.3%. The compounded annual growth rate for Same Store controllable operating expensescompounding for the past decade is negative 0.4%at an annual rate of 0.1%.
Improving and Maintaining Apartment Community Quality. We believe that the physical condition and amenities of our apartment communities are important factors in our ability to maintain and increase rental rates. We invest in the maintenance and improvement of our apartment communities primarily through: Capital Enhancements, which may include kitchen and bath remodeling, energy conservation projects and investments in longer-lived materials as described above, all of which are generally lesser in scope than is a redevelopment and do not significantly disrupt property operations; Capital Improvements, which extend the useful life of an apartment community from its condition at our date of purchase; and Capital Replacements, which are capital additions made to replace the portion of an apartment community consumed during our ownership. During 2017,2018, we invested approximately $2,800$2,890 per apartment home in Capital Enhancements, $470$4,670 per apartment home in Capital Improvements planned as part of our initial investment in apartment communities acquired in 2018, $270 per apartment home in Capital Improvements for apartment communities acquired prior to 2018, and $1,050$1,052 per apartment home in Capital Replacements.
Redevelopment
Redevelopment is ourOur second line of business whereis the redevelopment and limited development of apartment communities. Through these activities, we expect to create value equal to 25% to 35% of our incremental investment by repositioning communities within our portfolio. Over the Aimco portfoliopast five years, we have spent approximately $1.0 billion on redevelopment and by constructing new communities.development, resulting in estimated value creation of approximately $400.0 million. We measure the rate and quality of financial returns by Net Asset ValueNAV creation, an important component of Economic Income, our primary measure of

long-term financial performance (Net Asset Value is defined under the Non-GAAP Measures heading in Item 7).performance. We invest to earn risk-adjusted returns in excess of those expected from the apartment communities sold in paired trades to fund the redevelopment andor development.
We undertake a range of redevelopments, including those in which buildings or exteriors are renovated without the need to vacate apartment homes; those in which significant renovation of apartment homes may be accomplished upon lease expiration and turnover; and those in which an entire building or community is vacated. We often execute redevelopmentsredevelopment using a phased approach, in which we renovate an apartment community in stages. Redevelopment work may include seeking entitlements from local governments, which enhance the value of our existing portfolio by increasing density, that is, the right to add apartment homes to a site.
We also undertake ground-up development when warranted by risk-adjusted investment returns, either directly or in connection with the redevelopment of an existing apartment community or, on a more limited basis, at a new location.community. When warranted, we rely on the expertise and credit of a third-party developer familiar with the local market to limit our exposure to construction risk.
Of these two activities, we favor redevelopment because it permits adjustment ofto the scope and timing of spending to align with changing market conditions and customer preferences.

Portfolio Management
Our portfolio management strategy involves the allocation of investment capital to enhance rent growth and increase long termlong-term capital values through portfolio design, emphasizing land value as well as location and submarket. We target geographic diversification in our portfolio in order to reduce the volatility of our rental revenue and to reduce the risk of undue concentration in any particular market. Similarly, we seek price point diversification by owning communities that offer apartment homes at rents below those asked by competitive new building supply.
Our portfolio of apartment communities is diversified across “A,” “B,” and “C+” price points, averaging “B/B+” in quality and is also diversified among someacross several of the largest markets in the United States. Please refer to the Executive Overview heading under Item 7 for a description of our portfolio quality ratings. At December 31, 2017,2018, our Real Estate portfolio was allocated about one halfone-half to “A” rated properties, and about one halfone-half to “B” and “C+” rated properties.
As part of our portfolio strategy, we seek to sell up to 10% of our portfolio annually and to reinvest the proceeds from such sales in accretive uses such as capital enhancements, redevelopments, occasional developments,limited development and selective acquisitions with projected free cash flowFree Cash Flow internal rates of return higher than expected from the communities being sold. Through this disciplined approach to capital recycling, we have significantly increased the quality and expected rental rate growth of our portfolio.
Balance Sheet
Our leverage strategy seeks to increasemagnify financial returns while using leverage with appropriate caution. We limit risk through balance sheet structure, employing low leverage, primarily non-recourse and long-dated property debt; build financial flexibility by maintaining ample unused and available credit as well as holding properties with substantial value unencumbered by property debt; and use partners’ capital when it enhances financial returns or reduces investment risk.
Our leverage includes our share of long-term, non-recourse, property debt encumbering apartment communities, outstanding borrowings under our revolving credit facility, and outstanding preferred equity.
We target thea ratio of Proportionate Debt plusand Preferred Equity to Adjusted EBITDA to be below 7.0x and we target thea ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. Please refer to the Non-GAAP Measures heading under Item 7 for definitionsOur ratios as of these terms. Our leverage includes our share of long-term, non-recourse property debt secured by apartment communities in our Real Estate portfolio, our term loan, outstanding borrowings under our revolving credit facility,December 31, 2018 were 7.2x and outstanding preferred equity.3.4x, respectively.
Our liquidity consists of cash balances and available capacity on our revolving line of credit. AtAs of December 31, 2017,2018, we had on hand $616.6 million in cash and restricted cash plus availableof $72.6 million and had capacity onto borrow $632.5 million under our line of credit.revolving credit facility.
We also manage our financial flexibility by maintaining an investment grade rating and holding apartment communities that are unencumbered by property debt. AtAs of December 31, 2017,2018, we held unencumbered apartment communities with an estimated fair market value of approximately $1.8$2.7 billion, up 12.5% year-over year.50% from December 31, 2017.
Please refer to the Executive Overview and Liquidity and Capital Resources headings under Item 7 for additional information regarding our balance sheet and liquidity.
Team and Culture
Our team and culture are keys to our success. Our intentional focus on a collaborative and productive culture based on respect for others and personal responsibility is reinforced by a preference for promotion from within basedwithin. We focus on succession planning and talent development to produce a strong, stable team that is the enduring foundation of our success. In 2017, Aimco was2018, we were recognized

by the Denver Post as a Top Work Place. We are one ofPlace for the sixth consecutive year, an accomplishment shared with only a dozen Coloradoseven other companies of all sizes that have earned this designation for five consecutive years.in Colorado.
Competition
In attracting and retaining residents to occupy our apartment communities we compete with numerous other housing providers. Our apartment communities compete directly with other rental apartments as well as condominiums and single-family homes that are available for rent or purchase in the markets in which our apartment communities are located. Principal factors of competition include rent or price charged, attractiveness of the location and apartment community, and the quality and breadth of services. The number of competitive apartment communities relative to demand in a particular area has a material effect on our ability to lease apartment homes at our communities and on the rents we charge. In certain markets, there exists an oversupply of newly-constructed apartment homes, single-family homes, and condominiums relative to consumer demand, which affects the pricing and occupancy of our rental apartments.
We also compete with other real estate investors, including other apartment REITs, pension and investment funds, partnerships and investment companies in acquiring, redeveloping, managing, obtaining financing for and disposing of apartment communities. This competition affects our ability to acquire apartment communities we want to add to our portfolio and the price that we pay

in such acquisitions; our ability to finance or refinance communities in our portfolio and the cost of such financing; and our ability to dispose of communities we no longer desire to retain in our portfolio and the timing and price available to us when we seek to dispose of such communities.
Taxation
Aimco
Aimco has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, which we refer to as the Code, commencing with our taxable year ended December 31, 1994, and intends to continue to operate in such a manner. The Code imposes various requirements related to organizational structure, distribution levels, diversity of stock ownership, and certain restrictions with regard to owned assets and categories of income that must be met in order to continue to qualify as a REIT. If Aimco continues to qualify for taxation as a REIT, Aimco will generally not be subject to United States federal corporate income tax on its taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation.
Certain of Aimco’s operations or a portion thereof, including property management and risk management are conducted through taxable REIT subsidiaries, each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and, as such, is subject to United States federal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities.
The Aimco Operating Partnership
The Aimco Operating Partnership is treated as a “pass-through” entity for United States federal income tax purposes and is not subject to United States federal income taxation. Partners in the Aimco Operating Partnership, however, are subject to tax on their allocable share of partnership income, gains, losses, deductions and credits, regardless of whether the partners receive any actual distributions of cash or other property from the Aimco Operating Partnership during the taxable year. Generally, the characterization of any particular item is determined by the Aimco Operating Partnership, rather than at the partner level, and the amount of a partner’s allocable share of such item is governed by the terms of the Aimco Operating Partnership’s Partnership Agreement. The Aimco Operating Partnership is subject to tax in certain states.
Regulation
General
Apartment communities and their owners are subject to various laws, ordinances, and regulations, including those related to real estate broker licensing and regulations relating to recreational facilities such as swimming pools, activity centers and other common areas. Changes in laws increasing the potential liability for environmental conditions existing on apartment communities or increasing the restrictions on discharges or other conditions, as well as changes in laws affecting development, construction, and safety requirements, may result in significant unanticipated expenditures, which would adversely affect our net income and cash flows from operating activities. In addition, existing rent control laws, as well as future enactment of rent control or rent stabilization laws, such as legislation that has been considered in New York and certain cities in California, or other laws regulating multifamily housing, may reduce rental revenue or increase operating costs in particular markets.

Environmental
Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present at an apartment community. These materials may include lead-based paint, asbestos, polychlorinated biphenyls and petroleum-based fuels. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the release or presence of such materials. In connection with the ownership, operation and management of apartment communities, we could potentially be liable for environmental liabilities or costs associated with our current apartment communities, communities we acquire or manage in the future, or communities we previously owned or operated in the past. These and other risks related to environmental matters are described in more detail in Item 1A. Risk Factors.
Insurance
Our primary lines of insurance coverage are property, general liability and workers’ compensation. We believe that our insurance coverages adequately insure our apartment communities against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood, terrorism and other perils, and adequately insure us against other risk. Our coverage includes deductibles, retentions and

limits that are customary in the industry. We have established loss prevention, loss mitigation, claims handling and litigation management procedures to manage our exposure.
Employees
At December 31, 2017,2018, we had approximately 1,3501,050 team members, of whichwhom about 1,000700 were at the apartment community level performing on-site functions or at our shared service center performing tasks that have been centralized there, with the balance managing corporate and area functions, including investment and debt transactions, legal, finance and accounting, information systems, human resources and other support functions. As of December 31, 2017,2018, unions represented approximately 8050 of our team members. We have never experienced a work stoppage and believe we maintain satisfactory relations with our team members.
Available Information
Our combined Annual Report on Form 10-K, our combined Quarterly Reports on Form 10-Q, Current Reports on Form 8-K filed by Aimco or the Aimco Operating Partnership and any amendments to any of those reports that we file with the Securities and Exchange Commission are available free of charge as soon as reasonably practicable through Aimco’s website at www.aimco.com. The information contained on Aimco’s website is not incorporated into this Annual Report. Aimco’s Common Stock is listed on the New York Stock Exchange under the symbol “AIV.” In 2017,2018, Aimco’s chief executive officer submitted his annual corporate governance listing standards certification to the New York Stock Exchange, which certification was unqualified.
Item 1A. Risk Factors
The risk factors noted in this section and other factors noted throughout this Annual Report, describe certain risks and uncertainties that could cause our actual results to differ materially from those contained in any forward-looking statement.
Redevelopment, development and construction risks could affect our profitability.
We are currently redeveloping certain of our apartment communities. During 20182019, we expect to invest $120$225 million to $200$275 million in redevelopment and development activities. Redevelopment and development are subject to numerous risks, including the following:
we may be unable to obtain, or experience delays in obtaining, necessary zoning, occupancy or other required governmental or third-party permits and authorizations, which could result in increased costs or the delay or abandonment of opportunities;
we may incur costs that exceed our original estimates due to increased material, labor or other costs, such as litigation;
we may be unable to complete construction and lease-up of an apartment community on schedule, resulting in increased construction and financing costs and a decrease in expected rental revenues;
occupancy rates and rents at an apartment community may fail to meet our expectations for a number of reasons, including changes in market and economic conditions beyond our control and the development of competing communities;
we may be unable to obtain financing with favorable terms, or at all, which may cause us to delay or abandon an opportunity;
we may abandon opportunities that we have already begun to explore, or stop projects we have already commenced, for a number of reasons, including changes in local market conditions or increases in construction or financing costs, and, as a result, we may fail to recover costs already incurred in exploring those opportunities;
we may incur liabilities to third parties during the redevelopment or development process;

unexpected events or circumstances may arise during the redevelopment or development process that affect the timing of completion and the cost and profitability of the redevelopment or development; and
loss of a key member of a redevelopment or development team could adversely affect our ability to deliver redevelopments and developments on time and within our budget.
Failure to generate sufficient net operating income may adversely affect our liquidity, limit our ability to fund necessary capital expenditures or adversely affect our ability to pay dividends or distributions.
Our ability to fund necessary capital expenditures on our apartment communities depends on, among other things, our ability to generate net operating income in excess of required debt payments. If we are unable to fund capital expenditures on our apartment communities, we may not be able to preserve the competitiveness of our communities, which could adversely affect their net operating income and long termlong-term value.

Our ability to make payments to our investors depends on our ability to generate net operating income in excess of required debt payments and capital expenditure requirements. Our net operating income and liquidity may be adversely affected by events or conditions beyond our control, including:
the general economic climate;
an inflationary environment in which the costs to operate and maintain our communities increase at a rate greater than our ability to increase rents, which we can only do upon renewal of existing leases or at the inception of new leases;
competition from other apartment communities and other housing options;
local conditions, such as loss of jobs, unemployment rates or an increase in the supply of apartments, that might adversely affect apartment occupancy or rental rates;
changes in governmental regulations and the related cost of compliance;
changes in tax laws and housing laws, including the enactment of rent control laws or other laws regulating multifamily housing; and
changes in interest rates and the availability of financing.
Competition could limit our ability to lease apartment homes or increase or maintain rents.
Our apartment communities compete for residents with other housing alternatives, including other rental apartments and condominiums, and, to a lesser degree, single-family homes that are available for rent, as well as new and existing condominiums and single-family homes for sale. Competitive residential housing as well as household formation and job creation in a particular area could adversely affect our ability to lease apartment homes and to increase or maintain rental rates.
Because real estate investments are relatively illiquid, we may not be able to sell apartment communities when appropriate.
Real estate investments are relatively illiquid and generally cannot be sold quickly. REIT tax rules also restrict our ability to sell apartment communities. Thus, we may not be able to change our portfolio promptly in response to changes in economic or other market conditions. Our ability to dispose of apartment communities in the future will depend on prevailing economic and market conditions, including the cost and availability of financing. This could have a material adverse effect on our financial condition or results of operations.
If we are not successful in our acquisition of apartment communities, our results of operations could be adversely affected.
The selective acquisition of apartment communities is a component of our strategy. However, we may not be able to complete transactions successfully in the future. Although we seek to acquire apartment communities when such acquisitions increase our free cash flowFree Cash Flow internal rate of returns and are accretive to Net Asset Value, such transactions may fail to perform in accordance with our expectations. In particular, following acquisition, the value and operational performance of an apartment community may be diminished if obsolescence or neighborhood changes occur before we are able to redevelop or sell the community. This could have an adverse effect on our financial condition or results of operations.
Our existing and future debt financing could result in foreclosure of our apartment communities, prevent us from making distributions on our equity, or otherwise adversely affect our liquidity.
We are subject to the risk that our cash flow from operations will be insufficient to make required payments of principal and interest, and the risk that existing indebtedness may not be refinanced or that the terms of any refinancing will not be as favorable as the terms of existing indebtedness. If we fail to make required payments of principal and interest on our non-recourse debt, our

lenders could foreclose on the apartment communities and other collateral securing such debt, which would result in the loss to us of income and asset value. As of December 31, 2017,2018, the majority of our apartment communities were encumbered by debt. Our organizational documents do not limit the amount of debt that we may incur, and we have significant amounts of debt outstanding. Payments of principal and interest may leave us with insufficient cash resources to operate our communities or pay distributions required to be paid in order to maintain Aimco’s qualification as a REIT.
Disruptions in the financial markets could affect our ability to obtain financing and the cost of available financing and could adversely affect our liquidity.
Our ability to obtain financing and the cost of such financing depends on the overall condition of the United States credit markets. During periods of economic uncertainty the United States credit markets may experience significant liquidity disruptions, which may cause the spreads on debt financings to widen considerably and make obtaining financing, both non-recourse property debt and corporate borrowings such as those under our revolving credit agreement, more difficult. In particular, apartment

borrowers have benefited from the historic willingness of Federal National Mortgage Association, or Fannie Mae, and the Federal Home Loan Mortgage Corporation, or Freddie Mac, to make substantial amounts of loans secured by multi-family properties, even in times of economic distress. These two lenders are federally chartered and subject to federal regulation, which is subject to change, making uncertain their prospects and ability to provide liquidity in a future downturn.
If our ability to obtain financing is adversely affected, we may be unable to satisfy scheduled maturities on existing financing through other sources of liquidity, which could result in lender foreclosure on the apartment communities securing such debt and loss of income and asset value, eachboth of which would adversely affect our liquidity.
Increases in interest rates would increase our interest expense and reduce our profitability.
As of December 31, 2017,2018, we had approximately $399.8$420.5 million of variable-rate indebtedness outstanding associated with our Real Estate portfolio.outstanding. We estimate that an increase in 30-day LIBOR of 100 basis points with constant credit risk spreads would reduce our net income and the amount of net income attributable to our common security holders (including Aimco common stockholders and the Aimco Operating Partnership’s common unitholders) by approximately $3.8$4.2 million on an annual basis.
At December 31, 2017, our Real Estate portfolio2018, we had approximately $95.3$72.6 million in cash and cash equivalents and restricted cash, a portion of which bear interest at variable rates indexed to LIBOR-based rates, which may partially mitigate the effect of an increase in variable rates on our variable-rate indebtedness discussed above.
Covenant restrictions may limit our ability to make payments to our investors.
Some of our debt and other securities contain covenants that restrict our ability to make distributions or other payments to our investors unless certain financial tests or other criteria are satisfied. Our revolving credit agreement provides, among other things, that we may not make distributions to our investors during any four consecutive fiscal quarters in an aggregate amount greater than 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status. Our outstanding classes of preferred stock or preferred units prohibit the payment of dividends on our Common Stock or common partnership units if we fail to pay the dividends to which the holders of the preferred stock or preferred units are entitled.
The Aimco Operating Partnership and its subsidiaries may be prohibited from making distributions and other payments.
All of Aimco’s apartment communities are owned, and all of Aimco’s operations are conducted, by the Aimco Operating Partnership. Further, many of the Aimco Operating Partnership’s apartment communities are owned by subsidiaries of the Aimco Operating Partnership. As a result, Aimco depends on distributions and other payments from the Aimco Operating Partnership, and the Aimco Operating Partnership depends on distributions and payments from its subsidiaries in order to satisfy our financial obligations and make payments to our investors. The ability of the Aimco Operating Partnership and its subsidiaries to make such distributions and other payments depends on their earnings and cash flows and may be subject to statutory or contractual limitations. As an equity investor in the Aimco Operating Partnership and its subsidiaries, our right to receive assets upon their liquidation or reorganization will be effectively subordinated to the claims of their creditors. To the extent that we are recognized as a creditor of such subsidiaries, our claims may still be subordinate to any security interest in or other lien on their assets and to any of their debt or other obligations that are senior to our claims.
Potential liability or other expenditures associated with potential environmental contamination may be costly.
Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Potentially hazardous materials may include polychlorinated biphenyls, petroleum-based fuels, lead-based paint or asbestos, among other materials. Such laws often impose liability without regard to fault or whether the owner or operator

knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions, damages to natural resources and for potential fines or penalties in connection with such damage or with respect to the improper management of hazardous materials. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials at an apartment community. In addition to potential environmental liabilities or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.

Laws benefiting disabled persons may result in our incurrence of unanticipated expenses.
Under the Americans with Disabilities Act of 1990, or ADA, all places intended to be used by the public are required to meet certain federal requirements related to access and use by disabled persons. The Fair Housing Amendments Act of 1988, or FHAA, requires apartment communities first occupied after March 13, 1991, to comply with design and construction requirements for disabled access. For those apartment communities receiving federal funds, the Rehabilitation Act of 1973 also has requirements regarding disabled access. These and other federal, state and local laws may require structural modifications to our apartment communities or changes in policy/practice, or affect renovations of the communities. Noncompliance with these laws could result in the imposition of fines or an award of damages to private litigants and also could result in an order to correct any non-complying feature, which could result in substantial capital expenditures. Although we believe that our apartment communities are substantially in compliance with present requirements, we may incur unanticipated expenses to comply with the ADA, the FHAA and the Rehabilitation Act of 1973 in connection with the ongoing operation or redevelopment of our apartment communities.
Moisture infiltration and resulting mold remediation may be costly.
Although we are proactively engaged in managing moisture intrusion and preventing the presence of mold at our apartment communities, it is not unusual for periodic moisture intrusion to cause mold in isolated locations within an apartment community. We have implemented policies, procedures and training, and include a detailed moisture intrusion and mold assessment during acquisition due diligence. We believe these measures will manage mold exposure at our apartment communities and will minimize the effects that mold may have on our residents. To date, we have not incurred any material costs or liabilities relating to claims of mold exposure or to abate mold conditions. We have only limited insurance coverage for property damage claims arising from the presence of mold and for personal injury claims related to mold exposure.
Government housing regulations may limit the opportunities at some of our apartment communities and failure to comply with resident qualification requirements may result in financial penalties and/or loss of benefits, such as rental revenues paid by government agencies. Additionally, the government may cease to operate or reduce funding for government housing programs which would result in a loss of benefits from those programs.
We own equity interests in consolidated and unconsolidated entities that own certain apartment communities that benefit from governmental programs intended to provide housing to people with low or moderate incomes. These programs, which are usually administered by the United States Department of Housing and Urban Development, or HUD, or state housing finance agencies, typically provide one or more of the following: mortgage insurance; favorable financing terms; tax-exempt interest; historic or low-income housing tax credits; or rental assistance payments to the apartment community owners. As a condition of the receipt of assistance under these programs, the apartment communities must comply with various requirements, which typically limit rents to pre-approved amounts and limit our choice of residents to those with incomes at or below certain levels. Failure to comply with these requirements may result in financial penalties or loss of benefits. We are usually required to obtain the approval of HUD in order to acquire or dispose of a significant interest in or manage a HUD-assisted apartment community. We may not always receive such approval.
Additionally, there is no guarantee that the government will continue to operate these programs or that the programs will be operated in a manner that generates benefits consistent with those received in the past. Any cessation of or change in the administration of benefits from these government housing programs may result in our loss or reduction in the amount of the benefits we receive under these programs, including rental subsidies. During 2017, 2016 and 2015, rental revenues for our Real Estate portfolio included $30.6 million, $30.9 million and $25.6 million, respectively, from subsidies from government agencies. Of the 2017 subsidies, approximately 23.9% related to communities sold during 2017 leaving about $7.1 million related to communities benefiting from housing assistance contracts that expire in 2018, which we are in the process of renewing or anticipate renewing, and $16.2 million related to communities benefiting from housing assistance contracts that expire after 2018 and had a weighted average term of 8.0 years. Any loss or reduction in the amount of these benefits may adversely affect our liquidity and results of operations.
We also hold nominal ownership positions in partnerships owning low-income housing tax credit communities. We provide services to these partnerships and receive fees and other payments in return. We refer to this relationship as our Asset Management business. During 2017, 2016 and 2015, rental revenues of communities owned by partnerships served by our Asset Management business included $49.0 million, $49.3 million and $47.8 million, respectively, of subsidies from government agencies.
Although we are insured for certain risks, the cost of insurance, increased claims activity or losses resulting from casualty events may affect our operating results and financial condition.
We are insured for a portion of our consolidated apartment communities’ exposure to casualty losses resulting from fire, earthquake, hurricane, tornado, flood and other perils, which insurance is subject to deductibles and self-insurance retention. We recognize casualty losses or gains based on the net book value of the affected apartment community and the amount of any related

insurance proceeds. In many instances, the actual cost to repair or replace the apartment community may exceed its net book value and any insurance proceeds. We recognize the uninsured portion of losses as casualty losses in the periods in which they are incurred. In addition, we are self-insured for a portion of our exposure to third-party claims related to our employee health insurance plans, workers’ compensation coverage and general liability exposure. With respect to our exposure to claims of third parties, we establish reserves at levels that reflect our known and estimated losses. The ultimate cost of losses and the impact of unforeseen events may vary materially from recorded reserves, and variances may adversely affect our operating results and financial condition. We purchase insurance to reduce our exposure to losses and limit our financial losses on large individual risks. The availability and cost of insurance are determined by market conditions outside our control. No assurance can be made that we will be able to obtain and maintain insurance at the same levels and on the same terms as we do today. If we are not able to obtain or maintain insurance in amounts we consider appropriate for our business, or if the cost of obtaining such insurance increases materially, we may have to retain a larger portion of the potential loss associated with our exposures to risks.
Natural disasters and severe weather may affect our operating results and financial condition.
Natural disasters such as earthquakes and severe weather such as hurricanes may result in significant damage to our apartment communities. The extent of our casualty losses and loss in operating income in connection with such events is a function of the severity of the event and the total amount of exposure in the affected area. When we have geographic concentration of exposures, a single catastrophe (such as an earthquake) or destructive weather event (such as a hurricane) affecting a region may have a significant adverse effect on our financial condition and results of operations. We cannot accurately predict natural disasters or severe weather, or the number and type of such events that will affect us. As a result, our operating and financial results may vary significantly from one period to the next. Although we anticipate and plan for losses, there can be no assurance that our financial

results will not be adversely affected by our exposure to losses arising from natural disasters or severe weather in the future that exceed our previous experience and assumptions.
We depend on our senior management.
Our success depends upon the retention of our senior management, including Terry Considine, our chief executive officer. We have a succession planning and talent development process that is designed to identify potential replacements and develop our team members to provide depth in the organization and a bench of talent on which to draw. However, there are no assurances that we would be able to find qualified replacements for the individuals who make up our senior management if their services were no longer available. The loss of services of one or more members of our senior management team could have a material adverse effect on our business, financial condition and results of operations. We do not currently maintain key-man life insurance for any of our employees.
Aimco may fail to qualify as a REIT.
If Aimco fails to qualify as a REIT, Aimco will not be allowed a deduction for dividends paid to its stockholders in computing its taxable income, and will be subject to United States federal income tax at regular corporate rates. This would substantially reduce our funds available for distribution to our investors. Unless entitled to relief under certain provisions of the Code, Aimco also would be disqualified from taxation as a REIT for the four taxable years following the year during which it ceased to qualify as a REIT. In addition, Aimco’s failure to qualify as a REIT would place us in default under our revolving credit agreement.
We believe that Aimco operates, and has since its taxable year ended December 31, 1994, operated, in a manner that enables it to meet the requirements for qualification as a REIT for United States federal income tax purposes. Aimco’s continued qualification as a REIT will depend on its satisfaction of certain asset, income, investment, organizational, distribution, stockholder ownership and other requirements on a continuing basis. Aimco’s ability to satisfy the asset tests depends upon our analysis of the fair market values of our assets, some of which are not susceptible to a precise determination, and for which we do not obtain independent appraisals. Aimco’s compliance with the REIT annual income and quarterly asset requirements also depends upon our ability to manage successfully the composition of our income and assets on an ongoing basis. Moreover, the proper classification of an instrument as debt or equity for United States federal income tax purposes may be uncertain in some circumstances, which could affect the application of the REIT qualification requirements. Accordingly, there can be no assurance that the Internal Revenue Service, or the IRS, will not contend that our interests in subsidiaries or other issuers constitutes a violation of the REIT requirements. Moreover, future economic, market, legal, tax or other considerations may cause Aimco to fail to qualify as a REIT, or Aimco’s Board of Directors may determine to revoke its REIT status.
REIT distribution requirements limit our available cash.
As a REIT, Aimco is subject to annual distribution requirements. The Aimco Operating Partnership pays distributions intended to enable Aimco to satisfy its distribution requirements. This limits the amount of cash available for other business purposes, including amounts to fund our growth. Aimco generally must distribute annually at least 90% of its REIT taxable income, determined without regard to the dividends paid deduction and excluding any net capital gain, in order for its distributed earnings not to be

subject to United States federal corporate income tax. We intend to make distributions to Aimco’s stockholders to comply with the requirements of the Code. However, differences in timing between the recognition of taxable income and the actual receipt of cash could require us to sell apartment communities or borrow funds on a short-term or long-term basis to meet the 90% distribution requirement of the Code.
Aimco may be subject to federal and state income taxes, in certain circumstances.
Even if Aimco qualifies as a REIT, Aimco may be subject to United States federal income and excise taxes in various situations, such as on its undistributed income. Aimco could also be required to pay a 100% tax on any net income on non-arm’s length transactions between Aimco and a taxable REIT subsidiary and on any net income from sales of apartment communities that were held for sale primarily in the ordinary course. State and local tax laws may not conform to the United States federal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions in which Aimco transacts business. Any taxes imposed on Aimco would reduce our operating cash flow and net income and could negatively impact our ability to pay dividends and distributions.
Dividends payable by REITs do not qualify for the reduced tax rates available for some dividends.
REITs are entitled to a U.S.United States federal tax deduction for dividends paid to their stockholders. As compared to other taxable corporations, this ability to reduce or eliminate the REIT’s taxable income by paying dividends to stockholders is a principal benefit of maintaining REIT status, generally resulting in a lower combined tax liability of the REIT and its stockholders as

compared to that of the combined tax liability of other taxable corporations and their stockholders. Notwithstanding this combined benefit, dividends payable by REITs may result in marginally higher taxes to the stockholder.
C-corporations are generally required to pay U.S.United States federal income tax on earnings. After tax earnings are then available for stockholder dividends. The maximum U.S. federal tax rate applicable to income from "qualified dividends"“qualified dividends” payable to U.S.United States stockholders that are individuals, trusts and estates is currently 20%, plus the 3.8% investment tax surcharge. While dividends payable by REITs are generally not eligible for the qualified dividend reduced rates, stockholders that are individuals, trusts or estates may deduct 20% of the aggregate amount of ordinary dividends from REITs. This deduction is available for taxable years beginning after December 31, 2017, and before January 1, 2026, and will generally cause the maximum tax rate for ordinary dividends from REITs to be 29.6%, plus the 3.8% investment tax surcharge.
Beginning in 2018, REIT dividends payable The more favorable tax rates applicable to individuals, trusts and estates can be taxed at 20% for capital gains andregular corporate qualified dividends 25% for unrecaptured Section 1250 gains, or 29.6% for ordinary dividends, whereas qualified dividends from C-corporations are generally taxed at 20%. Both are subject to the 3.8% investment tax surcharge. Based on the character of Aimco’s 2017 REIT dividends, the effective U.S. federal income tax rate that would be be paid on Aimco’s 2018 dividends by stockholderscould cause investors who are individuals, trusts and estates wouldto perceive investments in REITs to be 25.5% before consideringrelatively less attractive than investments in the 3.8% investment tax surcharge. Toshares of non-REIT corporates that pay dividends, which could adversely affect the extent, the character of Aimco’s 2018 REIT dividends are similar to that of 2017, Aimco dividends would be taxed at a marginal rate 5.5% higher than the rate for a C-corporation dividend. In 2017, the ordinary income portion of of Aimco’s REIT taxable income was elevated compared to prior years. If the character of Aimco’s 2018 REIT dividends are similar to the averagevalue of the last three years,shares of REITs, including Aimco dividends would be taxed at a marginal rate 4.6% higher than the rate for a C-corporation dividend.Common Stock.
Changes to U.S.United States federal income tax laws could materially and adversely affect Aimco and Aimco'sAimco’s stockholders.
The present U.S.United States federal income tax treatment of REITs may be modified, possibly with retroactive effect, by legislative, judicial or administrative action at any time, which could affect the U.S.United States federal income tax treatment of an investment in Aimco Common Stock. The U.S.United States federal income tax rules dealing with REITs constantly are under review by persons involved in the legislative process, the IRS and the U.S.United States Treasury Department, which results in statutory changes as well as frequent revisions to regulations and interpretations. The recently enacted Tax Cuts and Jobs Act made substantial changes to the Code. Among those changes are a significant permanent reduction in the generally applicable corporate tax rate,We cannot predict how changes in the taxation of individualstax laws might affect Aimco or Aimco’s stockholders. Revisions in federal tax laws and other non-corporate taxpayers that generally but not universally reduce their tax rates oninterpretations thereof could significantly and negatively affect Aimco’s ability to qualify as a temporary basis subject to ‘‘sunset” provisions, the elimination or modification of various currently allowed deductions (including substantial limitations on the deductibility of interest and, in the case of individuals, the deduction for personal state and local taxes), certain additional limitations on the deduction of net operating losses, and preferential rates of taxation on most ordinary REIT dividends and certain business income derived by noncorporate taxpayers in comparison to other ordinary income recognized by such taxpayers. The effect of these and the many other changes made in the Tax Cuts and Jobs Act is highly uncertain, both in terms of their direct effect on the taxation oftax considerations relevant to an investment in Aimco Common Stock, or could cause Aimco to change its investments and commitments.
Government housing regulations may limit the opportunities at some of our common stockapartment communities and their indirect effect on market conditions generally. Furthermore, manyfailure to comply with resident qualification requirements may result in financial penalties and/or loss of benefits, such as rental revenues paid by government agencies. Additionally, the government may cease to operate or reduce funding for government housing programs which would result in a loss of benefits from those programs.
We own equity interests in entities that own certain apartment communities that benefit from governmental programs intended to provide housing to people with low or moderate incomes. These programs, which are usually administered by the United States Department of Housing and Urban Development, or HUD, or state housing finance agencies, typically provide one or more of the provisionsfollowing: mortgage insurance; favorable financing terms; tax-exempt interest; historic or low-income housing tax credits; or rental assistance payments to the apartment community owners. As a condition of the Tax Cutsreceipt of assistance under these programs, the apartment communities must comply with various requirements, which typically limit rents to pre-approved amounts and Jobs Act will require guidance throughlimit our choice of residents to those with incomes at or below certain levels. Failure to comply with these requirements may result in financial penalties or loss of benefits. We are usually required to obtain the issuanceapproval of Treasury regulationsHUD in order to assess their effect. Thereacquire or dispose of a significant interest in or manage a HUD-assisted apartment community. We may be a substantial delay beforenot always receive such regulations are promulgated, increasing the uncertainty as to the ultimate effect of the statutory amendments on Aimco. There may also be technical corrections legislation proposed with respect to the Tax Cuts and Jobs Act, the effect and timing of which cannot be predicted and may be adverse to Aimco or Aimco's stockholders.

Investors are urged to consult their tax advisors with respect to these changes and the potential effect on their investment in Aimco’s Common Stock.approval.
Limits on ownership of shares specified in Aimco’s charter may result in the loss of economic and voting rights by purchasers that violate those limits.
Aimco’s charter limits ownership of Common Stock by any single stockholder (applying certain “beneficial ownership” rules under the federal securities laws) to 8.7% (or up to 12.0% upon a waiver from Aimco’s Board of Directors) of outstanding shares of Common Stock, or 15% in the case of certain pension trusts, registered investment companies and Mr. Considine (or up to 18.0% for such pension trusts or registered investment companies upon a waiver from Aimco’s Board of Directors). Aimco’s charter also limits ownership of Aimco’s Common Stock and preferred stock by any single stockholder to 8.7% of the value of the outstanding Common Stock and preferred stock, or 15% in the case of certain pension trusts, registered investment companies and Mr. Considine. The charter also prohibits anyone from buying shares of Aimco’s capital stock if the purchase would result in Aimco losing its REIT status. This could happen if a transaction results in fewer than 100 persons owning all of Aimco’s shares of capital stock or results in five or fewer persons (applying certain attribution rules of the Code) owning 50% or more of the value of all of Aimco’s shares of capital stock. If anyone acquires shares in excess of the ownership limit or in violation of the ownership requirements of the Code for REITs:
the transfer will be considered null and void;
we will not reflect the transaction on Aimco’s books;
we may institute legal action to enjoin the transaction;

we may demand repayment of any dividends received by the affected person on those shares;
we may redeem the shares;
the affected person will not have any voting rights for those shares; and
the shares (and all voting and dividend rights of the shares) will be held in trust for the benefit of one or more charitable organizations designated by Aimco.
Aimco may purchase the shares of capital stock held in trust at a price equal to the lesser of the price paid by the transferee of the shares or the then current market price. If the trust transfers any of the shares of capital stock, the affected person will receive the lesser of the price paid for the shares or the then current market price. An individual who acquires shares of capital stock that violate the above rules bears the risk that the individual:
may lose control over the power to dispose of such shares;
may not recognize profit from the sale of such shares if the market price of the shares increases;
may be required to recognize a loss from the sale of such shares if the market price decreases; and
may be required to repay to us any dividends received from us as a result of his or her ownership of the shares.
Aimco’s charter may limit the ability of a third-party to acquire control of Aimco.
The 8.7% and other ownership limits discussed above may have the effect of delaying or precluding acquisition by a third-party of control of Aimco without the consent of Aimco’s Board of Directors. Aimco’s charter authorizes its Board of Directors to issue up to 510,587,500 shares of capital stock. As of December 31, 2017,2018, 500,787,260 shares were classified as Common Stock, of which 157,189,447149,133,826 were outstanding, and 9,800,240 shares were classified as preferred stock, of which 5,000,000 were outstanding. Under Aimco’s charter, its Board of Directors has the authority to classify and reclassify any of Aimco’s unissued shares of capital stock into shares of capital stock with such preferences, conversion or other rights, voting power restrictions, limitations as to dividends, qualifications or terms or conditions of redemptions as the Board of Directors may determine. The authorization and issuance of a new class of capital stock could have the effect of delaying or preventing someone from taking control of Aimco, where there is a difference of opinion between the Aimco Board of Directors and others as to what is in Aimco’s stockholders’ best interests.
The Maryland General Corporation Law may limit the ability of a third-party to acquire control of Aimco.
As a Maryland corporation, Aimco is subject to various Maryland laws that may have the effect of discouraging offers to acquire Aimco and increasing the difficulty of consummating any such offers, where there is a difference of opinion between the Aimco Board of Directors and others as to what is in Aimco’s stockholders’ best interests. The Maryland General Corporation Law, specifically the Maryland Business Combination Act, restricts mergers and other business combination transactions between Aimco

and any person who acquires, directly or indirectly, beneficial ownership of shares of Aimco’s stock representing 10% or more of the voting power without Aimco’s Board of Directors’ prior approval. Any such business combination transaction could not be completed until five years after the person acquired such voting power, and generally only with the approval of stockholders representing 80% of all votes entitled to be cast and 66-2/3% of the votes entitled to be cast, excluding the interested stockholder, or upon payment of a fair price. The Maryland General Corporation Law, specifically the Maryland Control Share Acquisition Act, provides generally that a person who acquires shares of Aimco’s capital stock representing 10% or more of the voting power in electing directors will have no voting rights unless approved by a vote of two-thirds of the shares eligible to vote. Additionally, the Maryland General Corporation Law provides, among other things, that the board of directors has broad discretion in adopting stockholders’ rights plans and has the sole power to fix the record date, time and place for special meetings of the stockholders. To date, Aimco has not adopted a stockholders’ rights plan. In addition, the Maryland General Corporation Law provides that a corporation that:
has at least three directors who are not officers or employees of the entity or related to an acquiring person; and
has a class of equity securities registered under the Securities Exchange Act of 1934, as amended,

may elect in its charter or bylaws or by resolution of the board of directors to be subject to all or part of a special subtitle that provides that:
the corporation will have a staggered board of directors;
any director may be removed only for cause and by the vote of two-thirds of the votes entitled to be cast in the election of directors generally, even if a lesser proportion is provided in the charter or bylaws;
the number of directors may only be set by the board of directors, even if the procedure is contrary to the charter or bylaws;
vacancies may only be filled by the remaining directors, even if the procedure is contrary to the charter or bylaws; and
the secretary of the corporation may call a special meeting of stockholders at the request of stockholders only on the written request of the stockholders entitled to cast at least a majority of all the votes entitled to be cast at the meeting, even if the procedure is contrary to the charter or bylaws.
To date, Aimco has not made any of the elections described above.
Item 1B. Unresolved Staff Comments
None.

Item 2. Properties
Additional information about our consolidated apartment communities is contained in “Schedule III - Real Estate and Accumulated Depreciation” in this Annual Report on Form 10-K. Refer to Note 4 to the consolidated financial statements in Item 8 for additional information regarding property debt.
Our Real Estate portfolio is diversified by both price point and geography and consists of market rate apartment communities in which we own a substantial interest. Our Real Estate portfolio includes garden style, mid-rise and high-rise apartment communities located in 2217 states and the District of Columbia. Our portfolio strategy seeks predictable rent growth from a portfolio of apartment communities diversified among some of the largest markets in the United States, and that is diversified across “A,” “B” and “C+” price points, averaging “B/B+” in quality. As of December 31, 2017,2018, our Real Estate portfolio consisted of roughly one halfone-half “A” quality communities and one halfone-half “B” and “C+” quality communities (as measured by gross asset value). Please refer to the Executive Overview heading under Item 7 for a description of our portfolio quality ratings. The following table sets forth information on the apartment communities in our Real Estate portfolio as of December 31, 2017:2018:
Number of Apartment Communities Number of Apartment Homes Average Economic OwnershipNumber of Apartment Communities Number of Apartment Homes Average Economic Ownership
Atlanta5
 817
 100%5
 817
 100%
Bay Area16
 3,236
 100%12
 2,632
 100%
Boston15
 4,689
 100%15
 4,689
 100%
Chicago10
 3,246
 100%10
 3,246
 100%
Denver8
 2,065
 98%8
 2,151
 98%
Greater New York18

1,040
 100%18
 1,040
 100%
Greater Washington, DC13
 5,325
 99%14
 5,900
 100%
Los Angeles13
 4,347
 100%13
 4,347
 100%
Miami5
 2,652
 100%5
 2,671
 100%
Philadelphia5
 2,796
 97%8
 2,638
 97%
San Diego12
 2,423
 97%12
 2,423
 97%
Seattle2
 239
 100%2
 239
 100%
Other markets14
 4,029
 97%12
 3,756
 99%
Total Real Estate portfolio136
 36,904
 99%134
 36,549
 99%
At December 31, 2017,2018, we owned an equity interest in 136134 apartment communities with 36,90436,549 apartment homes in our Real Estate portfolio. We consolidated 132130 of these apartment communities with 36,76236,407 apartment homes.
These consolidated apartment communities contained, on average, 279280 apartment homes, with the largest community containing 2,113 apartment homes. These apartment communities offer residents a range of amenities, including resort pools with cabanas, grills, clubhouses, spas, fitness centers, package lockers, dog parks and large open spaces. Many of the apartment homes offer features such as granite countertops, wood flooring, stainless steel appliances, fireplaces, spacious closets, washer and dryer connections, balconies and patios.

The majority of our consolidated apartment communities are encumbered by property debt. At December 31, 2017,2018, apartment communities in our Real Estate portfolio were encumbered by, in aggregate, $3.5$3.9 billion of property debt with a weighted average interest rate of 4.6%4.18% and a weighted average maturity of 7.28.0 years. The apartment communities collateralizing this non-recourse property debt have an estimated aggregate fair value of $10.9$10.2 billion. At December 31, 2017,2018, we held unencumbered apartment communities with an estimated fair value of approximately $1.8 billion.
At December 31, 2017, we also held nominal ownership positions in partnerships that own 46 apartment communities with 6,898 apartment homes that qualify for low-income housing tax credits and are structured to provide for the pass through of tax credits and tax deductions to their partners. We provide asset management and other services to these partnerships and receive fees and other payments in return. In accordance with accounting principles generally accepted in the United States of America, or GAAP, we consolidate most of these partnerships, which own an aggregate of 39 apartment communities with 6,211 apartment homes.$2.7 billion.
Item 3. Legal Proceedings
As further discussed in Note 5 to the consolidated financial statements in Item 8, we are engaged in discussions with regulatory agencies regarding environmental matters at apartment communities we, or predecessor entities, previously owned. Although the outcome of these matters is uncertain, we do not expect the resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.

Additionally, as further discussed in Note 3 to the consolidated financial statements in Item 8, in January 2018 we reached an agreement to settle litigation pertaining to the ownership of a property we acquired in 2014.
Item 4. Mine Safety Disclosures
Not applicable.

PART II

Item 5. Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Aimco
Aimco’s Common Stock has been listed and traded on the NYSE under the symbol “AIV” since July 22, 1994. The following table sets forth the quarterly high and low sales prices of our Common Stock, as reported on the NYSE, and the dividends declared in the periods indicated:
Quarter EndedHigh Low 
Dividends
Declared
(per share)
December 31, 2017$45.47
 $43.15
 $0.36
September 30, 201746.45
 42.42
 0.36
June 30, 201744.99
 42.64
 0.36
March 31, 201746.53
 43.11
 0.36
      
December 31, 2016$45.45
 $39.88
 $0.33
September 30, 201647.59
 43.30
 0.33
June 30, 201644.16
 39.57
 0.33
March 31, 201641.82
 35.45
 0.33
Aimco’s Board of Directors determines and declares its dividends. In making a dividend determination, Aimco’s Board of Directors considers a variety of factors, including: REIT distribution requirements; current market conditions; liquidity needs; and other uses of cash, such as for deleveraging and accretive investment activities. Aimco’s Board of Directors targets a dividend payout ratio between 65% and 70% of Adjusted Funds From Operations (which is defined in Item 7). In January 2018, Aimco’s Board of Directors declared a cash dividend of $0.38 per share on its Common Stock. On an annualized basis, this represents an increase of 6% compared to the dividends paid in 2017. This dividend is payable on February 28, 2018, to stockholders of record on February 16, 2018. Aimco’s Board of Directors anticipates similar per share quarterlycash dividends for the remainder of 2018. However, the Board of Directors may adjust the dividend amount or the frequency with which the dividend is paid based on then prevailing circumstances.
On February 27, 2018, the closing price of Aimco Common Stock was $38.43 per share, as reported on the NYSE, and15, 2019, there were 157,330,262148,766,616 shares of Common Stock outstanding, held by 1,7411,673 stockholders of record. The number of holders does not include individuals or entities who beneficially own shares but whose shares are held of record by a broker or clearing agency, but does include each such broker or clearing agency as one record holder.
As a REIT, Aimco is required to distribute annually to holders of its Common Stock at least 90% of its “real estate investment trust taxable income,” which, as defined by the Code and United States Department of Treasury regulations, is generally equivalent to net taxable ordinary income.
From time to time, Aimco may issue shares of Common Stock in exchange for OP Units, defined under The Aimco Operating Partnership heading below. Please refer to Note 7 to the consolidated financial statements in Item 8 for further discussion of such exchanges. Aimco may also issue shares of Common Stock in exchange for limited partnership interests in consolidated real estate partnerships. During the year ended December 31, 2017,2018, Aimco did not issue any shares of Common Stock in exchange for OP Units or limited partnership interests in consolidated real estate partnerships.
The following table summarizes Aimco’s share repurchases (in thousands, except for per share data) for the three months ended December 31, 2018:
Fiscal periodTotal Number of Shares Purchased Average Price Paid per Share Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Shares that May Yet Be Purchased Under Plans or Programs (1)
October 1 - October 31, 20181,708
 $43.91
 1,708
 17,616
November 1 - November 30, 20181,828
 45.50
 1,828
 15,788
December 1 - December 31, 20184,683
 46.00
 4,683
 11,105
Total8,219
 $45.43
 8,219
  
(1)Aimco’s Board of Directors has, from time to time, authorized Aimco to repurchase shares of its outstanding capital stock. There were no repurchases of Aimco shares during the year ended December 31, 2017. As of December 31, 2017, Aimco was authorized to repurchase approximately 19.3 million shares. This authorization has no expiration date. These repurchases may be made from time to time in the open market or in privately negotiated transactions.


Performance Graph
The following graph compares cumulative total returns for Aimco’s Common Stock, the MSCI US REIT Index, the NAREIT Apartment Index, and the Standard & Poor’s 500 Total Return Index (the “S&P 500”). The MSCI US REIT Index is published by Morgan Stanley Capital International Inc., a provider of equity indices. The NAREIT Apartment Index is published by The National Association of Real Estate Investment Trusts, or NAREIT, a representative of real estate investment trusts and publicly traded real estate companies with interests in United States real estate and capital markets. The MSCI REIT Index reflects total shareholder return for a broad range of REITs and the NAREIT Apartment Index provides a more direct multifamily peer comparison of total shareholder return. The indices are weighted for all companies that fit the definitional criteria of the particular index and are calculated to exclude companies as they are acquired and to add companies to the index calculation as they become publicly traded companies. All companies that fit the definitional criteria and existed at the point in time presented are included in the index calculations. The graph assumes the investment of $100 in Aimco’s Common Stock and in each index on December 31, 2012,2013, and that all dividends paid have been reinvested. The historical information set forth below is not necessarily indicative of future performance.
chart-23721a2a503b5e1dac2.jpg
For the fiscal years ended December 31,For the fiscal years ended December 31,
Index201220132014201520162017201320142015201620172018
Aimco (1)$100.00
$98.95
$146.49
$162.81
$190.96
$189.68
100.00148.04164.54192.98191.69199.60
MSCI US REIT (1)100.00
102.47
133.60
136.97
148.75
156.29
100.00130.38133.67145.16152.52145.55
NAREIT Apartment Index (2)100.00
93.80
130.97
152.52
156.88
162.72
100.00139.62162.60167.24173.46179.88
S&P 500 (1)100.00
132.39
150.51
152.59
170.84
208.14
100.00113.69115.26129.05157.22150.33
(1) Source: S&P Global Market Intelligence © 20182019
(2) Source: National Association of Real Estate Investment Trusts
The Performance Graph will not be deemed to be incorporated by reference into any filing by Aimco under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except to the extent that Aimco specifically incorporates the same by reference.

The Aimco Operating Partnership
Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as OP Units. OP Units include common partnership units, which we refer to as common OP Units, as well as partnership preferred units, or preferred OP Units. There is no public market for the Aimco Operating Partnership’s common partnership units, including OP Units, and we have no intention of listing the common partnership units on any securities exchange. In addition, the Aimco Operating Partnership’s Partnership Agreement restricts the transferability of common partnership units, including OP Units. The following table sets forth the distributions declared per
At February 15, 2019, there were 158,495,487 common partnership unit in each quarterly period during the two years ended December 31, 2017units and 2016:
Quarter Ended2017 2016
December 31$0.36
 $0.33
September 300.36
 0.33
June 300.36
 0.33
March 310.36
 0.33
equivalents outstanding (148,766,616 of which were held by Aimco) that were held by 2,515 unitholders of record.
The Aimco Operating Partnership’s Partnership Agreement generally provides that after holding common OP Units for one year, limited partners other than Aimco have the right to redeem their common OP Units for cash or, at our election, shares of Aimco Common Stock on a one-for-one basis (subject to customary antidilution adjustments).
No common OP Units or preferred OP Units held by Limited Partners were redeemed for shares of Aimco Common Stock during the year ended December 31, 2018.
The following table summarizes the Aimco Operating Partnership’s repurchases of common OP Units for the three months ended December 31, 2018:
Fiscal periodTotal Number of Units Purchased Average Price Paid per Unit Total Number of Units Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Units that May Yet Be Purchased Under Plans or Programs
October 1 - October 31, 201811,150
 $43.96
 N/A N/A
November 1 - November 30, 20183,765
 43.47
 N/A N/A
December 1 - December 31, 201811,360
 46.45
 N/A N/A
Total26,275
 $44.97
    
Dividend and Distribution Payments
As a REIT, Aimco is required to distribute annually to holders of its Common Stock at least 90% of its “real estate investment trust taxable income,” which, as defined by the Code and United States Department of Treasury regulations, is generally equivalent to net taxable ordinary income. Aimco’s Board of Directors determines and declares its distributions.dividends. In making a dividend determination, Aimco’s Board of Directors considers a variety of factors, including: REIT distribution requirements; current market conditions; liquidity needs; and other uses of cash, such as for deleveraging and accretive investment activities. Aimco’s Board of Directors targets a dividend payout ratio between 65% and 70% of Adjusted Funds From Operations.
In February 2019, the Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and 4.5 million shares of Class A Common Stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed.
Stockholders receiving such dividend and any future dividend payable in cash and shares of Aimco Common Sock will be required to include the full amount of such dividends as ordinary income to the extent of Aimco’s current and accumulated earnings and profits, as determined for United States federal income tax purposes for the year of such dividends, and may be required to pay income taxes with respect to such dividends in excess of the cash dividends received. With respect to certain non-United States stockholders, Aimco may be required to withhold United States tax with respect to such dividends, including in respect of all or a portion of such dividend that is payable in Common Stock.
The Board of Directors of the Aimco Operating Partnership’s general partner determines and declares distributions on OP Units. Aimco, through wholly-owned subsidiaries, is the general and special limited partner of and, as of December 31, 2017,2018, owned a 95.5%94.3% ownership interest in the common partnership units of the Aimco Operating Partnership and thePartnership. The Aimco Operating Partnership holds all of Aimco’s assets and manages the daily operations of Aimco’s business. The distributions paid by the Aimco Operating Partnership to Aimco are used by Aimco to fund the dividends paid to its stockholders. Accordingly, the per share dividends Aimco pays to its stockholders generally equal the per shareunit distributions paid by the Aimco Operating Partnership to holders of its common partnership units.
At
In February 27, 2018, there were 164,901,915 common partnership units and equivalents outstanding (157,330,2622019, the Board of which were held by Aimco) that were held by 2,624 unitholdersDirectors of record.
The Aimco Operating Partnership’s Partnership Agreement generally provides that after holding common OP Units for one year, limited partners other than Aimco have the right to redeem their common OP Units for cash or, at our election, shares of Aimco Common Stock.
No common OP Units or preferred OP Units held by Limited Partners were redeemed for shares of Aimco Common Stock during the year ended December 31, 2017.
The following table summarizes the Aimco Operating Partnership’s repurchasesgeneral partner declared a special distribution on the common partnership units that consists of $71.5 million in cash and 4.8 million common OP Units forpartnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019.
In order to neutralize the three months ended December 31, 2017:
Fiscal periodTotal Number of Units Purchased Average Price Paid per Unit Total Number of Units Purchased as Part of Publicly Announced Plans or Programs Maximum Number of Units that May Yet Be Purchased Under Plans or Programs
October 1 - October 31, 20171,212
 $45.04
 N/A N/A
November 1 - November 30, 20174,155
 44.26
 N/A N/A
December 1 - December 31, 20172,685
 44.42
 N/A N/A
Total8,052
 $44.43
    
Dividenddilutive impact of the stock issued in the special dividend, Aimco’s Board of Directors also authorized a reverse stock split in which every 1.03119 share of Class A Common Stock will be combined into one share of Class A Common Stock, effective at the close of business on February 20, 2019. The Board of Directors of the Aimco Operating Partnership’s general partner authorized a corresponding reverse unit split to be effective concurrent with the Aimco reverse stock split. As a result, total shares and Distribution Paymentstotal units outstanding following completion of the transactions are expected to be unchanged from the total shares and units outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Our revolving credit agreement includes customary covenants, including a restriction on dividends and other restricted payments, but permits dividends and distributions during any four consecutive fiscal quarters in an aggregate amount of up to 95% of Aimco’s Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status.

Item 6. Selected Financial Data
The following selected financial data is based on audited historical financial statements of Aimco and the Aimco Operating Partnership. This information should be read in conjunction with such financial statements, including the notes thereto, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included herein or in previous filings with the Securities and Exchange Commission.
Years Ended December 31,Years Ended December 31,
2017 2016 2015 2014 20132018 2017 2016 2015 2014
(dollar amounts in thousands, except per share data)(dollar amounts in thousands, except per share data)
OPERATING DATA:                  
Total revenues (1)$1,005,437
 $995,854
 $981,310
 $984,363
 $974,053
$972,410
 $1,005,437
 $995,854
 $981,310
 $984,363
Net income (1)347,079
 483,273
 271,983
 356,111
 237,825
716,603
 347,079
 483,273
 271,983
 356,111
Net income attributable to Aimco/the Aimco Operating Partnership per common share/unit – diluted$1.96
 $2.67
 $1.52
 $2.06
 $1.40
$4.21
 $1.96
 $2.67
 $1.52
 $2.06
                  
BALANCE SHEET INFORMATION:                  
Total assets$6,079,040
 $6,232,818
 $6,118,681
 $6,068,631
 $6,046,579
$6,190,004
 $6,079,040
 $6,232,818
 $6,118,681
 $6,068,631
Total indebtedness3,861,770
 3,648,206
 3,599,648
 3,852,885
 4,090,653
4,075,665
 3,861,770
 3,648,206
 3,599,648
 3,852,885
Non-recourse property debt of partnerships served by Asset Management business227,141
 236,426
 249,493
 255,140
 265,196

 227,141
 236,426
 249,493
 255,140
                  
OTHER INFORMATION:                  
Dividends/distributions declared per common share/unit$1.44
 $1.32
 $1.18
 $1.04
 $0.96
$1.52
 $1.44
 $1.32
 $1.18
 $1.04

(1)Effective January 1, 2014, we adopted a new accounting standard, which revised the definition of a discontinued operation. In the selected financial data presentation above, for the year ended December 31, 2013, total revenues excludes revenue generated by discontinued operations of $62.2 million and net income includes income from discontinued operations, net of tax, of $203.2 million.
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Executive Overview
We are focused on the ownership, management, redevelopment and limited development of quality apartment communities located in someseveral of the largest markets in the United States.
Our principal financial objective is to provide predictable and attractive returns to our equity holders. We measure our currentlong-term total return using Economic Income, defined as Net Asset Value, or NAV, growth plus dividends. NAV is used by many investors because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors, enhancing comparability among companies that have differences in their accounting, avoiding disparity that can result from application of GAAP to investment properties and various ownership structures. Some investors focus on multiples of Adjusted Funds From Operations, or AFFO, and Funds From Operations, or FFO. Our disclosure of AFFO, a measure of current return, complements our long-term total return usingfocus on Economic Income. In 2017, AFFO grew by 7.6% to $2.12 per share.We also use Pro forma Funds From Operations, or Pro forma FFO, as a secondary measure of operational performance. Over the last five years, our Economic Income grew at a compound annual return of 13.7%,11.5%

as of September 30, 2018, comprised of 10.6%a 8.5% compounded annual growth in net asset value, or NAV, per share and $5.78$6.36 in cash dividends per share paid over the period. We also use Pro forma Funds From Operations, or Pro forma FFO, as a measure of operational performance. Economic Income, NAV,In 2018, AFFO and Pro forma FFO are non-GAAP measures and are defined under the Non-GAAP Measures heading below.grew by 1.9% to $2.16 per share.
Our business and five areas of strategic focus are described in more detail within the Business Overview in Item 1. The results from execution of our business plan in 20172018 are further described in the sections that follow.
Net income attributable to common stockholders per common share decreasedincreased by $0.71$2.25 for the year ended December 31, 2017,2018, as compared to 2016,2017, primarily due to lower gains on the sale of the Asset Management Business and lower-rated apartment communities and higher depreciation expense, partially offsetcommunities.
For the year ended December 31, 2018, our NAV per share increased by increased contribution from property net operating income more fully described below.about 6%, which, with our cash dividend, provided Economic Income of 8.5%.
Pro forma FFO per share increased $0.13,$0.02, or 5.6%0.8%, for the year ended December 31, 2017,2018, as compared to 2016. The primary driver of this increase was property net operating income growth of $0.11 per share, consisting of:2017 due to the following items:
$0.100.08 from Same Store property net operating income growth of 4.2%3.1%, driven primarily by a 3.2%3.1% increase in revenue, and almost flat expense growth;offset by a 3.3% increase in expenses;
$0.120.16 net operating income contribution from the lease-up over the last 12 months of more than 800 renovated homes at redevelopment communities and completion of the lease-up of One Canal in Boston, and Indigo in Redwood City, California; and

$0.02 from our Other Real Estate apartment communities, primarily due to rate increases;communities; partially offset by
$0.13 lower property net operating incomeA reduction of $0.14 from apartment communities sold in 2016 to fund redevelopmentour investment activities;
A reduction of $0.03 from the sale of the Asset Management business, net of the contribution from the reinvestment of the proceeds in 2018 acquisitions and development activities and acquisitions.repayment of debt;
As compared to 2016,A reduction of $0.05 from lower interest rates, higher tax benefit, higher transactional incomebenefits and other factors, partially offset by lower deferred tax credit income, contributed an additional $0.02 to Pro forma FFO per share.items, net.
The $0.13$0.02 increase in year-over-year Pro forma FFO per share plus $0.02 in lower capital replacement spending due to fewer apartment homes increased AFFO by $0.15,$0.04, or 7.6%1.9% per share.
Operational Excellence
We own and operate a portfolio of market rate apartment communities diversified by both geography and price point.point, which we refer to as our Real Estate portfolio. At December 31, 2017,2018, our Real Estate portfolio included 136134 apartment communities with 36,90436,549 apartment homes in which we held an average ownership of approximately 99%. This portfolio was divided about two-thirds by value to our “Same Store” portfolio of stabilized apartment communities and about one-third by value to “Other Real Estate,” which includes recently acquired communities and communities under redevelopment or development whose long-term financial contribution is not yet stabilized.
Our property operations team deliveredproduced solid results for our Real Estate portfolio for the year ended December 31, 2017.2018. Highlights include:
Average daily occupancy of 96.5%, 50 basis points higher than the year ended 2017;
Same Store net operating income growth greater than 4% for the seventh year in a row;increased 3.1% with 74.2% net operating income margin; and
Same Store rent increases on renewals and new leases averaged 4.6%4.5% and 0.6%1.5%, respectively, for a weighted average increase of 2.5%; and
Completion of the lease-up of One Canal in Boston, and Indigo in Redwood City, California.3.0%.
Our focus on efficient operations through productivity initiatives such as centralization of administrative tasks, optimization of economies of scale at the corporate level, and investment in more durable, longer-lived materials has helped us control operating expenses. As a result of these efforts, our Same StoreThese and other innovations contributed to limiting growth in controllable operating expenses, which we defineexpense (defined as property operating expenses before real estateless taxes, insurance and utilities, decreased by 1.3% for the year ended December 31, 2017 compared to 2016. The compounded annual growth rate for Same Store controllable operating expensesutility expenses) compounding for the past decade is negative 0.4%at an annual rate of 0.1%.
For the year ended December 31, 2017,2018, our Real Estate portfolio provided 69%72% net operating income margins and 64%67% Free Cash Flow margins. Free Cash Flow is defined under the Non-GAAP Measures heading below.
In addition to those communities in our Real Estate portfolio, as of December 31, 2017, we held nominal ownership positions (generally less than 1%) in partnerships that own 46 low-income housing tax credit communities with 6,898 apartment homes. We provide asset management and other services to these partnerships and receive fees and other payments in return. Our relationship with these partnerships is different than real estate ownership and is better described as an Asset Management business. We have limited upside or downside exposure. In accordance with GAAP, we consolidate most of these partnerships and communities, thus reflecting their operating results as though they were our own until our fee and other interests have been repaid, generally upon sale of the underlying communities.
Redevelopment
Our second line of business is the redevelopment and limited development of apartment communities wherecommunities. Through these activities, we expect to create value equal to 25% to 35% of our incremental investment by repositioning communities within the Aimco portfolio and by constructing new communities.our portfolio. We measure the rate and quality of financial returns by Net Asset ValueNAV creation, an important component of Economic Income, our primary measure of long-term financial performance. We invest to earn risk-adjusted returnsOver the past five years, we have spent approximately $1.0 billion on redevelopment and development, resulting in excessestimated value creation of those expected from the apartment communities sold in paired trades to fund the redevelopment or development.
approximately $400.0 million. We also undertake limited ground-up development when warranted by risk-adjusted

investment returns, either directly or in connection with the redevelopment of an existing apartment community or, on a more limited basis, at a new location.community. When warranted, we rely on the expertise and credit of a third-party developer familiar with the local market to limit our exposure to construction risk.
We invest to earn risk-adjusted returns in excess of those expected from the apartment communities sold in paired trades to fund the redevelopment or development. Of these two activities, we favor redevelopment because it permits adjustment ofto the scope and timing of spending to align with changing market conditions and customer preferences.
During the year ended December 31, 2017,2018, we invested $172.4$175.9 million primarily in our ongoing redevelopment and development projects.development.

During the year ended December 31, 2017,In Boulder, Colorado, we completed construction on the third tower of Park Towne Place in Center City, Philadelphia. As of December 31, 2017, the first three towers combined were 89% leased with approximately 40 homes remaining to be leased at the third redeveloped tower to reach occupancy stabilization. Based on these results, we decided to proceed with a $40have invested $68.9 million redevelopment of the fourth and final tower. We have completed de-leasing and commenced construction on this tower, and lease-up is scheduled to commence in the springdevelopment of 2018.
We have planned and entitledParc Mosaic, a new $117.0 million, 226226-unit apartment home community to be known as Parc Mosaic, located in Boulder, Colorado on the site of our Eastpointe community. As part of this plan, as of December 31, 2017, we completed the de-leasing of Eastpointe and commenced demolition and construction. The site is two miles from the new Google campus and is across the street from Ball Aerospace’s Technology Campus and Foothills Hospital. Building in Boulder is highly regulated and new supply is limited, notwithstanding higher enrollment at the University of Colorado and increased employment generally.
InclusiveAt the University of theseColorado Anschutz Medical Campus, we exercised our option to acquire approximately two new projects,acres of land adjacent to our 21 Fitzsimons apartment community, and broke ground on the development of The Fremont, a 253-apartment home community. We expect to invest approximately $87.0 million to construct the community, which is expected to be ready for occupancy in late 2020.
We also commenced the next phase of redevelopment at our Flamingo community, located in Miami Beach, bringing our potential net investment to $39.7 million. This phase includes extensive redevelopment of retail, leasing, and common areas, including major enhancements to the entryway.
In Center City, Philadelphia, we completed the redevelopment of Park Towne Place, and as of December 31, 2018, we had leased 95.6% of the apartment homes at the community. This multi-year redevelopment of 940 apartment homes, amenities, and common area spaces, was executed on plan and leased-up in-line with expectations with expected free cash flow returns of greater than 9%.
In San Jose, California we completed the redevelopment of Saybrook Pointe, a 324-apartment home, garden-style community. Construction was completed on time and in-line with underwritten costs, and lease-up of the community finished ahead of schedule and at rates above underwriting, increasing the expected free cash flow return to greater than 14%, a 100 basis point outperformance to underwriting.
As of December 31, 2018, our total estimated net investment in redevelopment and development activities is $714.6$571.2 million, with a projected weighted average net operating income yield on these investments of 6.1%, assuming untrended rents. As of December 31, 2017, $513.12018, $361.0 million of this total has been funded.
During 2017,the year ended December 31, 2018, we leased over 800457 apartment homes at our redevelopment and development communities. As ofAt December 31, 2017,2018, our exposure to lease-up exposure at active redevelopment and development projects includedcommunities was approximately 611366 apartment homes, of which 232208 were being constructed at Parc Mosaic, and 158 were located in the fourth tower of Park Towne Place, whichfour other communities. Additionally, we expect to be available for lease beginningacquire One Ardmore in 2019 upon its completion as part of the summer of 2018 and 215 werePhiladelphia portfolio acquisition announced in Parc Mosaic, which we expectApril 2018. This acquisition will increase our exposure to be available for lease beginning in the summer of 2019.lease-up risk by approximately 100 apartment homes.
See below under the Liquidity and Capital Resources – Redevelopment/Development heading for additional information regarding our redevelopment and development investment during the year ended December 31, 2017.2018.
Portfolio Management
Our portfolio of apartment communities is diversified across “A,” “B,” and “C+” price points, averaging “B/B+” in quality and is diversified across someseveral of the largest markets in the U.S. We measure the quality of apartment communities in our Real Estate portfolio based on average rents of our apartment homes compared to local market average rents as reported by a third-party provider of commercial real estate performance and analysis. Under this rating system, we classify as “A” quality apartment communities those earning rents greater than 125% of the local market average,average; as “B” quality apartment communities those earning rents between 90% and 125% of the local market average; as “C+” quality apartment communities those earning rents greater than $1,100 per month, but lower than 90% of local market average; and as “C” quality apartment communities those earning rents less than $1,100 per month and lower than 90% of local market average. We classify as “B/B+” quality a portfolio that on average earns rents between 100% and 125% of the local market average rents where the portfolio is located. Although some companies and analysts within the multifamily real estate industry use apartment community quality ratings of “A,” “B,” and “C,” some of which are tied to local market rent averages, the metrics used to classify apartment community quality as well as the period for which local market rents are calculated may vary from company to company. Accordingly, our rating system for measuring apartment community quality is neither broadly nor consistently used in the multifamily real estate industry.

As part of our portfolio strategy, we seek to sell up to 10% of our portfolio annually and to reinvest the proceeds from such sales in accretive uses such as capital enhancements, redevelopments, occasionallimited developments and selective acquisitions with projected Free Cash Flow internal rates of return higher than expected from the communities being sold. Through this disciplined approach to capital recycling, we have significantly increased the quality and expected growth rate of our portfolio, resulting in a compound annual growth rate in average revenue per Aimco apartment home of 8.8% over the last three years.portfolio.
 Three Months Ended
 December 31,
 2017 2014
Average Revenue per Aimco apartment home (1)$2,123
 $1,650
Portfolio Average Rents as a Percentage of Local Market Average Rents113% 108%
Percentage A (4Q 2017 Average Revenue per Aimco Apartment Home $2,707)53% 45%
Percentage B (4Q 2017 Average Revenue per Aimco Apartment Home $1,848)32% 33%
Percentage C+ (4Q 2017 Average Revenue per Aimco Apartment Home $1,721)15% 5%
Percentage C% 17%
(1) Represents average monthly rental and other property revenues divided by the number of occupied apartment homes multiplied by our ownership interest in the apartment community as of the end of the current period.

 Three Months Ended
 December 31,
 2018 2015
Average Revenue per Aimco apartment home (1)$2,126
 $1,771
Portfolio Average Rents as a Percentage of Local Market Average Rents113% 111%
Percentage A (4Q 2018 Average Revenue per Aimco Apartment Home $2,786)51% 51%
Percentage B (4Q 2018 Average Revenue per Aimco Apartment Home $1,850)33% 32%
Percentage C+ (4Q 2018 Average Revenue per Aimco Apartment Home $1,706)16% 17%
(1) Represents average monthly rental and other property revenues (excluding resident reimbursement of utility cost) divided by the number of occupied apartment homes as of the end of the period.
The quality of our portfolio improved through value created by our redevelopment and transaction activities, contributing to the increase in average revenue per apartment home. TheOur average revenue per apartment home was $2,126 for the three months ended December 31, 2018, a 6.4% compounded annual growth rate compared to 2015. This increase is due to rent growth from the improved qualityin Same Store revenue as well as our acquisition activities, lease-up of our portfolio, driven in part byredevelopment and acquisition communities, and the sale of apartment communities with average monthly revenues per Aimco apartment home lower than those of the retained portfolio, and also by our reinvestment of the sales proceeds through redevelopment, development and acquisition of apartment communities with higher rents and better free cash flow return prospects than the apartment communities sold.portfolio.
As we execute our portfolio strategy, we expect to increase average revenue per Aimco apartment home for our Real Estate portfolio at a rate greater than market rent growth; increase free cash flowFree Cash Flow margins; and maintain sufficient geographic and price point diversification to moderatelimit volatility and concentration risk.
Apartment Community Acquisitions
We evaluate potential acquisitions with an eye for unique and opportunistic investments, and fund acquisitions pursuant to our “paired trade” discipline.
During the year ended December 31, 2017,2018, we acquired six apartment communities. We acquired for $307.9 million four apartment communities in the Philadelphia area including 665 apartment homes and 153,000 square feet of office and retail space. We also acquired for $160.0 million Bent Tree Apartments, a 748-apartment home community in Fairfax County, Virginia, and for $29.7 million Avery Row, a 67-apartment home community in Arlington, Virginia.
In addition to the four communities in Philadelphia that were acquired in 2018, we also agreed last year to purchase a fifth community, One Ardmore, upon completion of its construction in the first half of 2019.
Dispositions
During the year ended December 31, 2018, we sold fivefor $590.0 million our Asset Management business and four affordable apartment communities located in the Hunters Point area of San Francisco. After payment of transaction costs and repayment of property-level debt encumbering the Hunters Point apartment communities, net proceeds to us were $512.2 million.
During the year ended December 31, 2018, we also sold for $242.3 million four apartment communities with 2,2911,334 apartment homes, for a gain of $297.9 million and grosswhich were previously included in our Real Estate segment. Net proceeds of $397.0 million resulting in net proceeds of $381.1to us were $230.1 million. Two of these apartment communities were affordable communities located in Washington, DC and Philadelphia, and three were located in southern New JerseyVirginia, one was located in suburban Maryland, and southern Virginia.one was located in northern Philadelphia.
In JanuaryDuring the year ended December 31, 2018, we agreed to sellsold our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. AsWe provided seller financing with a resultstated value of $48.6 million and received net cash proceeds of approximately $5.0 million upon the settlement, we recognized a gross impairment loss of $35.8 million in our 2017 results, $25.6 million of which relates to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. Upon closing of the transaction, the tax liability will be assumed by the buyer, resulting in no economic loss. The remaining $10.2 million loss is offset by cash distributions we received during our ownership and avoided legal costs for continued litigation. On an economic basis, we agreed to sell these entities at roughly our purchase price, adjusted for retained cash distributions and avoided legal costs.sale.
Also inIn January 2018,2019, we sold three additionaltwo apartment communities with 513782 apartment homes for a gain of approximately $50.0 million, net of tax, and gross proceeds of $71.9 million, resulting in $64.6 million in net proceeds. Two of these communities are$141.2 million. One community was located in southern VirginiaSchaumberg, Illinois and one isthe other located in suburban Maryland.Virginia Beach, Virginia.
Proceeds from the 20172018 and 20182019 sales were used to repay outstanding borrowings onfund accretive investments in community acquisitions, capital enhancements, redevelopments and share repurchases, representing continued execution of our revolving credit facility, effectively funding the equity portionpaired trade strategy. This reallocation of the Palazzo reacquisition, as further discussed$1.1 billion in Note 3 to the consolidated financial statements in Item 8, as well as our 2017 redevelopment and development activities.capital increased expected Free Cash Flow internal rates of return by 420 basis points.

Balance Sheet
We target net leverage of $3.8 billion. At December 31, 2017, our leverage of $3.9 billion was above this target due to the timing of the three apartment community sales discussed above that closed in January 2018.
Our leverage includes our share of long-term, non-recourse property debt encumbering apartment communities in our Real Estate portfolio, our term loan, outstanding borrowings on the revolving credit facility and outstanding preferred equity. In our calculation of leverage, we exclude non-recourse property debt obligations of consolidated partnerships served by our Asset Management business, as these are not our obligations and they have limited effect on the amount of fees and other amounts we expect to receive in our role as asset manager for these partnerships.Leverage
Our leverage strategy seeks to increase financial returns while using leverage with appropriate caution. We limit risk through balance sheet structure, employing low leverage, primarily non-recourse and long-dated property debt; build financial flexibility by maintaining ample unused and available credit as well as holding properties with substantial value unencumbered by property debt; and use partners’ capital when it enhances financial returns or reduces investment risk.
Our leverage includes our share of long-term, non-recourse property debt encumbering apartment communities, outstanding borrowings on the revolving credit facility and outstanding preferred equity. For additional information regarding our leverage, please see the discussion under the Liquidity and Capital Resources heading.
Leverage Ratios
We target the ratio of Proportionate Debt and Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x.
Proportionate Debt, Adjusted EBITDA and Adjusted Interest Expense, as used in these ratios, are non-GAAP financial measures, which are further discussed and reconciled under the Non-GAAP Measures Leverage Ratios heading. Preferred Equity represents Aimco’s preferred stock and the Aimco Operating Partnership’s preferred OP Units. Our leverage ratios for the three months ended December 31, 2017,2018, are presented below:
Proportionate Debt to Adjusted EBITDA 6.5x6.8x
Proportionate Debt and Preferred Equity to Adjusted EBITDA 6.9x7.2x
Adjusted EBITDA to Adjusted Interest Expense 3.3x3.8x
Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends 3.1x3.4x

We calculate our leverage ratios based on the most recent three month amounts, annualized. Our calculation of Adjusted EBITDA in our leverage ratios has been adjustedcalculated on a pro forma basis to reflectadjust for significant items impacting the dispositionthree months ended December 31, 2018 for which annualization would distort the results. Leverage ratios are elevated by 0.5x due to the use of fivedebt to fund temporarily the Aimco common share repurchases completed during the three months ended December 31, 2018. We intend to reduce our Proportionate Debt and Preferred Equity to Adjusted EBITDA to 6.9x by the end of 2019 from earnings growth, primarily due to increasing contribution from Same Store apartment communities duringand reduction of debt balances due to regularly-scheduled debt amortization and apartment community sales, partially offset by the period as if the sales had closed on October 1, 2017. The effectloss of this pro forma adjustment may be foundearnings from communities sold. As used in the Adjusted EBITDA reconciliation underratios above, Preferred Equity represents Aimco’s preferred stock and the Non-GAAP Measures heading.Aimco Operating Partnership’s preferred OP units.
Refinancing Activity
During 2017,the year ended December 31, 2018, we closed or rate-locked nine fixed-rate, non-recourse, amortizing,addressed approximately half of our property loans totaling $550.8 million. Onmaturing in 2019, 2020, and 2021. We placed $867.4 million of new loans, $740.4 million of fixed-rate loans at a weighted basis, the term of these loans averaged 9.1 years and their interest rates averaged 3.48%, 123 basis points above the corresponding treasury rates at the time of pricing.
Also during 2017, we restructured five fixed-rate, non-recourse, amortizing, property loans totaling $17.4 million, extending their maturity dates from 2018 to 2023 and reducing their weighted average interest rate from 4.13% to 3.63%.
The net effect of 2017 property debt refinancing activities has been to lower our4.20% and a weighted average fixed interestterm of 9.3 years, and $127.0 million of variable-rate loans with rates by about 20floating at 115 basis points to 4.64%, generating prospectiveover 30-day LIBOR and a weighted average term of 5.1 years. This refinancing activity results in an annual interest savings of approximately $6.6$13.0 million.
Liquidity
Our liquidity consists of cash balances and available capacity on our revolving line of credit. During the year ended December 31, 2018, we exercised our option to expand our revolving credit facility by $200.0 million, bringing the total borrowing capacity to $800.0 million. As of December 31, 2017,2018, we had on hand $616.6 million of cash and restricted cash plus availableof $72.6 million and had the capacity to borrow up to $632.5 million on our revolving linecredit facility, after consideration of $7.1 million letters of credit backed by the facility. We use our credit facility primarily for working capital and other short-term purposes and to secure letters of credit.
We also manage our financial flexibility by maintaining an investment grade rating and holding apartment communities that are unencumbered by property debt. At December 31, 2017,2018, we held unencumbered apartment communities with an estimated fair market value of approximately $1.8$2.7 billion, up 12.5% year-over-year.50% from December 31, 2017.
Two credit rating agencies rate our creditworthiness, using different methodologies and ratios for assessing our credit, and both have rated our credit and outlook as BBB- (stable), an investment grade rating. Although some of the ratios they use are similar to those we use to measure our leverage, there are differences in our methods of calculation and therefore our leverage ratios disclosed above are not indicative of the ratios that may be calculated by these agencies.
For additional information regarding
Equity Capital Activities
During the year ended December 31, 2018, we repurchased 8.7 million shares of common stock, of which 0.5 million settled in January 2019, all for $394.1 million, at a weighted average price of $45.33 per share, approximately a 20% discount to our published NAV per share. Approximately half of the repurchases were funded with proceeds from 2018 and January 2019 property sales at a premium to the values ascribed to these communities in our published NAV. The remaining half of repurchases are temporarily funded with borrowings on our credit facility. We expect to repay these borrowings with proceeds from the sale of communities now under contract, again at prices greater than those used in our published NAV. With the completion of these transactions, we will have increased NAV by an estimated $0.67 per share.
The 2019 property sales necessary to fund our share repurchases are expected to generate taxable gains of $285 million, which is in excess of our regular quarterly dividend. Accordingly, on February 3, 2019, Aimco’s Board of Directors declared a special dividend on the common stock that consists of $67.1 million in cash and 4.5 million shares of common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend also includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share, which represents an increase of 3% compared to cash dividends paid during 2018.
Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. Based on Aimco’s closing share price on February 15, 2019, we estimate the aggregate value of the special dividend to be approximately $290.3 million. However, the actual value will vary depending on the price of Aimco common stock on the dividend valuation dates (March 11 and 12, 2019).
In order to neutralize the dilutive impact of the stock issued in the special dividend, Aimco’s Board also authorized a reverse stock split, effective on February 20, 2019. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections. The reverse split will facilitate comparability of Aimco per share results before and after these transactions.
In aggregate, these transactions:
Increase NAV per share by 1%;
Do not affect Aimco’s regular quarterly cash dividend;
Reduce the number of Aimco shares outstanding by 6% (as a result of the share repurchases);
Minimize the aggregate tax paid by Aimco and its stockholders;
Are leverage please seeneutral; and
Result in no change in the discussion undernumber of shares outstanding (as a result of the Liquidityspecial dividend and Capital Resources heading.the reverse stock split), thereby improving comparability of per share results.
Team and Culture
Our team and culture are keys to our success. Our intentional focus on a collaborative and productive culture based on respect for others and personal responsibility is reinforced by a preference for promotion from within based on succession planning and talent development to produce a strong, stable team that is the enduring foundation of our success. In 2017, Aimco was2018, we were recognized by the Denver Post as a Top Work Place. We are one ofPlace for the sixth consecutive year, an accomplishment shared with only a dozen Coloradoseven other companies of all sizes that have earned this designation for five consecutive years.in Colorado.
Key Financial Indicators
The key financial indicators that we use in managing our business and in evaluating our operating performance are Economic Income, our measure of long-term total return, and Adjusted Funds From Operations,AFFO, our measure of current return. In addition to these indicators, we evaluate our operating performance and financial condition using: Pro forma Funds From Operations; FCF; same storeFFO; Free Cash Flow; Same Store property net operating results;income; proportionate property net operating income; average revenue per effective apartment home; leverage ratios; and net leverage. Certain of these financial indicators are non-GAAP financial measures, which are defined, further described and, for certain of the measures, reconciled to comparable GAAP-based measures under the Non-GAAP Measures heading below.

Results of Operations
Because our operating results depend primarily on income from our apartment communities, the supply of and demand for apartments influences our operating results. Additionally, the level of expenses required to operate and maintain our apartment communities and the pace and price at which we redevelop, acquire and dispose of our apartment communities affect our operating results.
The following discussion and analysis of the results of our operations and financial condition should be read in conjunction with the accompanying consolidated financial statements in Item 8.
Overview
2018 compared to2017
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $350.5 million and $370.4 million, respectively, for the year ended December 31, 2018 as compared to 2017. The increase in income was primarily due to an increase in gain on dispositions of real estate, including the 2018 sale of our Asset Management business, and results of operations described more fully below, partially offset by an increase in depreciation and amortization resulting from redeveloped and developed apartment homes placed into service.

2017 compared to 2016
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership decreased by $114.6 million and $120.0 million, respectively, for the year ended December 31, 2017 as compared to 2016. The decrease in income was

principally due to a decrease in gain on dispositions of real estate and an increase in depreciation and amortization resulting from redeveloped apartment homes placed into service and the completion of One Canal and the acquisition of Indigo in 2016, partially offset by improved operating results as further described below.

2016 compared to2015
Net income attributable to Aimco and net income attributable to the Aimco Operating Partnership increased by $181.7 million and $190.8 million, respectively, for the year ended December 31, 2016 as compared to 2015. The increase in income was principally due to an increase in gain on dispositions of real estate, partially offset by an increase in depreciation and amortization resulting from redeveloped apartment homes placed into service and the completion of One Canal and the acquisition of Indigo in 2016.results.
The following paragraphs discuss these and other items affecting the results of operations of Aimco and the Aimco Operating Partnership in more detail.
Property Operations
As described under the preceding Executive Overview heading, ourwe have a single reportable segment, Real Estate, segmentwhich consists primarily of market rate apartment communities in which we hold a substantial equity ownership interest.
We use proportionate property net operating income to assess the operating performance of our Real Estate portfolio. Proportionate property net operating income reflects our share of rental and other property revenues, excluding resident utility reimbursement, less direct property operating expenses, net of resident utility reimbursement, and including real estate taxes, for consolidated apartment communities we manage. Accordingly, the results of operations of our Real Estate segment discussed below are presented on a proportionate basis and exclude the results of four apartment communities with 142 apartment homes that we neither manage nor consolidate. Beginning in 2018, our segment results below reflect utility reimbursements as a reduction of the corresponding expense. We have revised the 2017 and 2016 amounts to conform to this presentation.
We do not include offsite costs associated with property management or casualty-related amounts in our assessment of segment performance. Accordingly, these items are not allocated to our segment results discussed below.
Refer to Note 12 into the consolidated financial statements in Item 8 for further discussion regarding our reportable segments,segment, including a reconciliation of these proportionate amounts to consolidated rental and other property revenues and property operating expenses.
Real Estate Proportionate Property Net Operating Income
We classify apartment communities within our Real Estate segment as Same Store and Other Real Estate. Same Store communities are those that have reached a stabilized level of operations as of the beginning of a two-year comparable period and maintained it throughout the current and comparable prior year, and are not expected to be sold within 12 months. Other Real Estate includes apartment communities that do not meet the Same Store definition, including, but not limited to: redevelopment and development apartment communities, which are those currently under construction that have not achieved a stabilized level of operations and those that have been completed in recent years that have not achieved and maintained stabilized operations for both the current and comparable prior year; acquisition apartment communities, which are those we have acquired since the beginning of a two-year comparable period; and communities that we expect to sell within 12 months but do not yet meet the criteria to be classified as held for sale.

As of December 31, 2017, as defined by our segment performance metrics,2018, our Real Estate segment consisted of 9293 Same Store communities with 26,38625,905 apartment homes and 3735 Other Real Estate communities with 9,8639,720 apartment homes.
From December 31, 20162017 to December 31, 2017,2018, on a net basis, our Same Store portfolio decreasedincreased by nine communitiesone community and decreased by 4,507481 apartment homes. These changes consisted of:
the addition of threeone developed apartment community with 91 apartment homes and one redeveloped apartment communitiescommunity with 974104 apartment homes that were classified as Same Store upon maintaining stabilized operations for the entirety of boththe periods presented;
the addition of one acquired apartment community with 94115 apartment homes that was classified as Same Store because we have now owned it for the entirety of boththe periods presented;
the addition of one apartment community with 492 apartment homes which we no longer expect to sell within 12 months;
the reduction of fiveone apartment communitiescommunity with 2,460821 apartment homes for which we commenced redevelopmentsold during the period;
the reduction of twoone apartment communitiescommunity with 90694 apartment homes we expectedexpect to sell during 2017;
the reduction of three apartment communities with 1,696 apartment homes sold during the period;2019; and
the reduction of threeone apartment communitiescommunity with 513368 apartment homes classified as held for sale.

sale at December 31, 2018.
As of December 31, 2017, our Other Real Estate communities included:
15 apartment communities with 6,386 apartment homes in redevelopment or development;
2 apartment communities with 578 apartment homes recently acquired;
4 apartment communities with 604 apartment homes owned that receive forms of government rental assistance; and
16 apartment communities with 2,295 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Prior to 2017, five of the Other Real Estate communities were classified as part of our former Affordable segment. The results of operations for these communities are reflected in the comparable periods in the tables below.
Our Real Estate segment results for the years ended December 31, 2017 and 2016, as presented below, are based on the apartment community classifications as of December 31, 2017.
 Year Ended December 31,
(in thousands)2017 2016 $ Change % Change
Rental and other property revenues:       
Same Store communities$587,562
 $569,522
 $18,040
 3.2%
Other Real Estate communities266,929
 222,065
 44,864
 20.2%
Total854,491
 791,587
 62,904
 7.9%
Property operating expenses:       
Same Store communities167,356
 166,134
 1,222
 0.7%
Other Real Estate communities97,830
 85,502
 12,328
 14.4%
Total265,186
 251,636
 13,550
 5.4%
Proportionate property net operating income:       
Same Store communities420,206
 403,388
 16,818
 4.2%
Other Real Estate communities169,099
 136,563
 32,536
 23.8%
Total$589,305
 $539,951
 $49,354
 9.1%
For the year ended December 31, 2017 compared to 2016, our Real Estate segment’s proportionate property net operating income increased $49.4 million, or 9.1%.
Same Store proportionate property net operating income increased by $16.8 million, or 4.2%. This increase was primarily attributable to an $18.0 million, or 3.2%, increase in rental and other property revenues due to higher average revenues ($59 per effective home), comprised primarily of increases in rental rates. Renewal rents (the rent paid by an existing resident who renewed her lease compared to the rent she previously paid) were up 4.6% for the year ended December 31, 2017, and new lease rents (the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home) were up 0.6%, resulting in a weighted average increase of 2.5%. The increase in Same Store rental and other property revenues was partially offset by a $1.2 million, or 0.7%, increase in property operating expenses, primarily due to increases in real estate taxes. During the year ended December 31, 2017 compared to 2016, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, decreased by $1.0 million, or 1.3%.
The proportionate property net operating income of Other Real Estate communities increased by $32.5 million, or 23.8%, due to:
redevelopment and lease-up activities during the year ended December 31, 2017, which helped contribute to incremental property net operating income of $20.9 million compared to 2016; and
higher property net operating income of $11.6 million from other communities, including the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of the 47% limited partner interest in the related joint venture.

As of December 31, 2016, as defined by our segment performance metrics, our Real Estate portfolio consisted of 95 Same Store apartment communities with 28,684 apartment homes and 34 Other Real Estate communities with 7,531 apartment homes.
As of December 31, 2016,2018, our Other Real Estate communities included:
13 apartment communities with 4,7256,294 apartment homes in redevelopment or development;
37 apartment communities with 6721,943 apartment homes recently acquired; and
415 apartment communities with 604 apartment homes owned that receive forms of government rental assistance; and
14 apartment communities with 1,5301,483 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 20162018 and 2015,2017, as presented below, are based on the apartment community classifications as of December 31, 2016, including the five Other Real Estate communities that were classified as part of our former Affordable segment until 2017, and excluding amounts related to apartment communities sold or classified as held for sale during 2017.2018.
Year Ended December 31,Year Ended December 31,
(in thousands)2016 2015 $ Change % Change2018 2017 $ Change % Change
Rental and other property revenues:       
Rental and other property revenues before utility reimbursements:       
Same Store communities$604,663
 $577,159
 $27,504
 4.8%$580,536
 $563,040
 $17,496
 3.1%
Other Real Estate communities186,924
 159,920
 27,004
 16.9%273,704
 218,154
 55,550
 25.5%
Total791,587
 737,079
 54,508
 7.4%854,240
 781,194
 73,046
 9.4%
Property operating expenses:       
Property operating expenses, net of utility reimbursements:       
Same Store communities181,077
 179,186
 1,891
 1.1%150,042
 145,301
 4,741
 3.3%
Other Real Estate communities70,559
 61,603
 8,956
 14.5%88,818
 77,430
 11,388
 14.7%
Total251,636
 240,789
 10,847
 4.5%238,860
 222,731
 16,129
 7.2%
Proportionate property net operating income:              
Same Store communities423,586
 397,973
 25,613
 6.4%430,494
 417,739
 12,755
 3.1%
Other Real Estate communities116,365
 98,317
 18,048
 18.4%184,886
 140,724
 44,162
 31.4%
Total$539,951
 $496,290
 $43,661
 8.8%$615,380
 $558,463
 $56,917
 10.2%
For the year ended December 31, 20162018 compared to 2015,2017, our Real Estate segment’s proportionate property net operating income increased $43.7$56.9 million, or 8.8%10.2%.
Same Store proportionate property net operating income increased by $25.6$12.8 million, or 6.4%3.1%. This increase was primarily attributable to a $27.5$17.5 million, or 4.8%3.1%, increase in rental and other property revenues due to higher average monthly revenues ($85of $50 per effective home),Aimco apartment home comprised primarily of increases in rental rates.rates and a 50 basis point increase in average daily occupancy. Renewal rents, (thewhich is the rent paid by an existing resident who renewed hera lease compared to the rent she previously paid)paid prior to renewal, were up 5.7%4.5% for the year ended December 31, 2016,2018, and new lease rents, (thewhich is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home)home, were up 2.4%1.5%, resulting in a weighted average increase of 4.0%3.0%. The increase in Same Store rental and other property revenues was partially offset by a $1.9$4.7 million, or 1.1%3.3%, increase in property operating expenses, primarily due to increases in real estate taxes personnel costs and repairs and maintenance partially offset by lower utilities expenses and insurance costs. During the year ended

December 31, 20162018 compared to 2015,2017, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, increased by $1.4$1.5 million, or 1.7%2.0%.
The proportionate property net operating income of Other Real Estate communities increased by $18.0$44.2 million, duringor 31.4%, for the year ended December 31, 20162018 compared to 2015. This2017 primarily due to:
a $24.1 million increase is attributable to the following:
$7.8 million increasein property net operating income due to the 2018 acquisition of the four Philadelphia communities, Bent Tree Apartments and Avery Row, as well as the stabilization of Indigo;
an $11.0 million increase in property net operating income stabilization of three redeveloped communities;
$3.7 million due to lease-upleasing activities at acquiredredevelopment and redeveloped apartmentdevelopment communities, partially offset by decreases due to apartment homes taken out of service for redevelopment; and
$6.5higher property net operating income of $9.1 million from other communities, primarily the effect of our increased ownership interest in the Palazzo communities from our June 2017 reacquisition of a 47% limited partner interest in the related joint venture.
As of December 31, 2017, as defined by our segment performance metrics, our Real Estate portfolio consisted of 90 Same Store apartment communities with 25,197 apartment homes and 32 Other Real Estate communities with 8,845 apartment homes.
As of December 31, 2017, our Other Real Estate communities included:
15 apartment communities with 6,386 apartment homes in redevelopment or development;
2 apartment communities with 578 apartment homes recently acquired; and
15 apartment communities with 1,881 apartment homes that do not meet the definition of Same Store because they are either subject to agreements that limit the amount by which we may increase rents or have not reached or maintained a stabilized level of occupancy as of the beginning of a two-year comparable period, often due to a casualty event.
Our Real Estate segment results for the years ended December 31, 2017 and 2016, as presented below, are based on the apartment community classifications as of December 31, 2017, and exclude amounts related to apartment communities sold or classified as held for sale during 2018. The results of operations for these communities are reflected in the comparable periods in the tables below.
 Year Ended December 31,
(in thousands)2017 2016 $ Change % Change
Rental and other property revenues before utility reimbursements:       
Same Store communities$547,912
 $530,619
 $17,293
 3.3%
Other Real Estate communities233,282
 189,683
 43,599
 23.0%
Total781,194
 720,302
 60,892
 8.5%
Property operating expenses, net of utility reimbursements:       
Same Store communities141,773
 140,007
 1,766
 1.3%
Other Real Estate communities80,958
 70,419
 10,539
 15.0%
Total222,731
 210,426
 12,305
 5.8%
Proportionate property net operating income:       
Same Store communities406,139
 390,612
 15,527
 4.0%
Other Real Estate communities152,324
 119,264
 33,060
 27.7%
Total$558,463
 $509,876
 $48,587
 9.5%
For the year ended December 31, 2017 compared to 2016, our Real Estate segment’s proportionate property net operating income increased $48.6 million, or 9.5%.
Same Store proportionate property net operating income increased by $15.5 million, or 4.0%. This increase was primarily attributable to a $17.3 million, or 3.3%, increase in rental and other property revenues due to higher average revenues of approximately $59 per effective home, comprised primarily of increases in rental rates. Renewal rents, which is the rent paid by an existing resident who renewed a lease compared to the rent paid prior to renewal, were up 4.6% for the year ended December 31, 2017, and new lease rents, which is the rent paid by a new resident compared to the rent paid by the previous resident of the same apartment home, were up 0.6%, resulting in a weighted average increase of 2.5%. The increase in Same Store rental and other property revenues was partially offset by a $1.8 million, or 1.3%, increase in property operating expenses, primarily due to

increases in real estate taxes. During the year ended December 31, 2017 compared to 2016, controllable operating expenses, which exclude utility costs, real estate taxes and insurance, decreased by $1.6 million, or 2.1%.
The proportionate property net operating income of Other Real Estate communities increased by $33.1 million, or 27.7%, for the year ended December 31, 2017 compared to 2016 primarily due to:
redevelopment and lease-up activities during the year ended December 31, 2017, which helped contribute to incremental property net operating income of $20.9 million compared to 2016; and
higher property net operating income of $12.0 million from other communities, including apartmentthe effect of our increased ownership interest in the Palazzo communities we acquiredfrom our June 2017 reacquisition of the 47% limited partner interest in 2015 and market rate increases at four apartment communities that were approved in 2016 by the Department of Housing and Urban Development.related joint venture.

Non-Segment Real Estate Operations
Operating income amounts not attributed to our Real Estate segment include offsite costs associated with property management, casualty losses, and the results of apartment communities sold or held for sale, reported in consolidated amounts, which we do not allocate to our Real Estate segment for purposes of evaluating segment performance, (seeas described in Note 12 to the consolidated financial statements in Item 8).8.
For the years ended December 31, 2018, 2017 2016 and 2015,2016, casualty losses totaled $4.0 million, $8.2 million and $5.6 million, respectively. Casualty losses during the year ended December 31, 2018 included several claims, primarily due to storm and $7.0 million, respectively.fire damage, partially offset by recovery from insurance carriers for insured losses in excess of policy limits. Casualty losses were elevated during the year ended December 31, 2017, primarily due to hurricane damage. Casualty losses were elevated during the year ended December 31, 2015, primarily due to losses resulting from property damage and snow removal costs associated with the severe snow storms in the Northeast.
For the years ended December 31, 2018, 2017 2016 and 2015,2016, apartment communities previously in our Real Estate portfolio that were sold or classified as held for sale as of December 31, 2017 generated net operating income of $26.5$22.3 million, $46.8$59.6 million and $68.8$79.7 million, respectively.
Asset Management Results
As further discussed in Note 2Prior to the consolidated financial statements in Item 8,July 2018 sale of our Asset Management business, we provideprovided asset management and other services to certain consolidated partnerships that ownowning apartment communities that qualify for low-income housing tax credits and are structured to provide for the pass-through of tax credits and tax deductions to their partners.
Contribution from Asset Management included in our consolidated financial statements includes:included: fees and other amounts paid to us from the net operating income of partnerships served by our Asset Management business, less interest expense incurred on non-recourse property debt obligations of the partnerships; income associated with delivery of tax credits to the third-party investors in the partnerships (including amounts received during the period and amounts received in previous periods);partnerships; and transactional revenue and other income less asset management expenses, (includingwhich included certain allocated offsite costs related to the operation of this business).business.
TheFor the year ended December 31, 2018 compared to 2017, contribution from Asset Management for the years ended December 31, 2017, 2016 and 2015, is presented in the table below.
 Year Ended December 31,
(in thousands)2017 2016 2015
Net operating income of partnerships served by the Asset Management business$43,745
 $43,161
 $41,887
Interest expense on non-recourse property debt of partnerships(13,031) (13,387) (12,984)
Amount available for payment of Asset Management fees30,714
 29,774
 28,903
Tax credit income, net10,049
 16,546
 22,819
Asset management expenses(5,934) (5,804) (6,770)
Transactional revenue and other income5,208
 8,290
 3,146
Contribution from the Asset Management business$40,037
 $48,806
 $48,098
For the periods presented above, the contribution from the Asset Management business fluctuated for the reasons discussed below.
Increases in the amount available for payment of Asset Management fees generated by the partnerships were primarily attributed to increases in rental incomedecreased $19.3 million due to higher rates, partially offset by the loss of net operating income from communities sold and higher operating expenses, including personnel and repairs and maintenance costs.its July 2018 sale.
Tax credit income, net, decreased primarily due to the delivery of substantially all of the tax credits on various partnerships and our 2016 acquisition of an investor limited partner’s interest in one of the tax credit partnerships (and their rights to undelivered tax credits) prior to the end of the tax credit delivery period. Following the purchase, we recognized tax benefits in our results of operations, which largely offset the tax credit income we otherwise would have recognized.
Transactional revenues forFor the year ended December 31, 2017 includes $2.4compared to 2016, contribution from Asset Management decreased $8.8 million due to decreases in fees earnedtax credit income as the result of delivering final credits and acquiring certain partners’ interests in connection with the disposition of real estatepartnerships, as well as transactional revenues.
Depreciation and forAmortization
For the year ended December 31, 2016 includes a $3.62018 compared to 2017, depreciation and amortization expense increased by $11.6 million fee earned for assisting a third-party property ownerprimarily due to apartment homes acquired in a mark-up-to-market renewal related to an affordable community we previously owned. Other income, for each of the years presented, includes results related to the Napico business, which is further described under the Other, net heading below.

We expect the contribution to our net income from the Asset Management business to decline2018 and renovated apartment homes placed in future years as we continue to deliver the final tax credits for these partnerships and, as part of our plan to exit the Asset Management business, the partnerships sell the underlyingservice after their completion, partially offset by decreases associated with apartment communities.
Depreciation and Amortizationcommunities sold.
For the year ended December 31, 2017 compared to 2016, depreciation and amortization expense increased by $33.1 million primarily due to renovated apartment homes placed in service after their completion, a full year of depreciation following the 2016 completion of our One Canal development and 2016 acquisition of Indigo, and other capital additions, partially offset by decreases associated with apartment communities sold.
For the year ended December 31, 2016 compared to 2015, depreciation and amortization expense increased by $26.8 million primarily due to renovated apartment homes placed in service after their completion, the completion of our One Canal and Vivo developments, and our 2016 acquisition of Indigo and other capital additions, partially offset by decreases associated with apartment communities sold.
General and Administrative Expenses
In recent years, we have worked toward simplifying our business, including the sale of our Asset Management Business, which allowed us to reduce overhead and other costs. This simplification and our scale reductions have allowed us to reduce our offsite

costs, which consist of general and administrative expenses, property management expenses and investment management expenses, by $11.6$6.4 million, or 15.1%8.6%, over the last three years.
For the year ended December 31, 2018 compared to 2017, general and administrative expenses increased $2.6 million, primarily due to higher variable incentive compensation cost.
For the year ended December 31, 2017 compared to 2016, general and administrative expenses decreased $3.1 million, primarily due to lower personnel and related costs including incentive compensation, professional services, technology costs and other corporate costs.
For the year ended December 31, 2016 compared to 2015, general and administrative expenses, excluding incentive compensation, decreased by approximately $0.2 million. Inclusive of incentive compensation, general and administrative expenses increased $0.5 million, primarily due to our performance against key performance indicators in 2016 as compared to 2015.
Other Expenses, Net
Other expenses, net includes franchise taxes, costs associated with our risk management activities, partnership administration expenses and certain non-recurring items.
For the year ended December 31, 2018 compared to 2017, other expenses, net decreased by $7.4 million, primarily due to the resolution of our litigation against Airbnb, and settlement of litigation related to the challenge to the title of the La Jolla Cove property which we acquired in 2014.
For the year ended December 31, 2017 compared to 2016, other expenses, net decreased by $2.9$3.1 million. The decrease was primarily due to the 2016 recognition of estimated future environmental clean-up and abatement costs associated with the matters discussed in Note 5 to the consolidated financial statements in Item 8, partially offset by legal costs we incurred related to a challenge to the title of a property we acquired in 2014.the La Jolla Cove property.
For the year ended December 31, 2016 compared to 2015, other expenses, net increased by $3.9 million. The increase was primarily due to the 2016 environmental costs discussed above, partially offset by lower legal and related costs.
Provision for Real Estate Impairment Loss
In JanuaryWe recognized no provisions for impairment losses during the years ended December 31, 2018 or 2016.
During the year ended December 31, 2018, we agreed to sell our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. As a result of the settlement, we recognized in our 2017 results a gross impairment loss of $35.8 million, $25.6 million of which relatesrelated to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. Upon closing of the transaction, theThe tax liability will bewas assumed by the buyer, resulting in no economic loss to Aimco.us. The remaining $10.2 million loss iswas offset by cash distributions paid to us during our ownership and avoided legal costs for continued litigation. On an economic basis, we agreed to sell these entities at roughly our purchase price, adjusted for retained cash distributions and avoided legal costs.
We recognized no provisions for impairment losses duringInterest Income
For the yearsyear ended December 31, 2016 or 2015.2018 compared to 2017, interest income increased $2.6 million, primarily due to interest earned on the seller financing notes received as consideration in the sale of the La Jolla Cove property.
Interest Expense
For the year ended December 31, 20172018 compared to 2016,2017, interest expense, which includes the amortization of debt issuance costs and amortization of deferred financing costs, increased by $6.0 million, or 3.1%. The increase was primarily due to debt prepayment penalties of $14.9 million incurred in connection with 2018 property-level debt refinancing activity undertaken to refinance property-level debt that was scheduled to mature in 2019, 2020, and 2021, partially offset by a decrease in mortgage interest expense for communities sold and the sale of the Asset Management business in July 2018, and lower corporate-level interest.
For the year ended December 31, 2017 compared to 2016, interest expense decreased by $1.8 million, or 0.9%. The decrease was primarily due to lower average outstanding balances on non-recourse property debt for our Real Estate apartment communities and lower interest rates, resulting in an $11.9 million reduction in interest expense. These decreases were partially offset by higher amounts outstanding on corporate borrowings (including our term loan and incremental line borrowings used to temporarily fund the reacquisition of

the Palazzo limited partner interests) and a decrease in capitalized interest associated with our redevelopment and development activities.
For the year ended December 31, 2016 compared to 2015, interest expense decreased by $3.3 million, or 1.7%. The decrease was primarily attributed to lower average outstanding balances from our repayment of non-recourse property debt and to a lesser extent from a lower average cost of debt on property loans refinanced during the year, resulting in an $8.1 million reduction in interest expense, and a $4.9 million reduction of interest expense on debt related to apartment community dispositions. These decreases were partially offset by increased interest expense on debt associated with apartment community acquisitions and on One Canal, the construction of which was completed during 2016 and for which we ceased interest capitalization, and higher average borrowings on our revolving credit facility.
Other, Net
Other, net includes our equity in the income or loss of unconsolidated real estate partnerships, and the results of operations related to the NapicoNAPICO business, which we accounted for under the profit sharing method prior to the derecognition of the final property during 2017.

For the year ended December 31, 2018 compared to 2017, other, net decreased by $7.4 million, primarily due to the derecognition of the final NAPICO property in 2017, which resulted in a gain. For the year ended December 31, 2017 compared to 2016, other, net income of the Napico business increased by $2.1 million. Formillion, also attributed to gain recognized upon the year ended December 31, 2016 compared to 2015, net incomederecognition of the Napico business increased by $5.4 million. As discussed in Note 3 to the consolidated financial statements in Item 8, in 2017 we derecognized the assets and liabilities related to the final Napico property, and in 2016 we partially derecognized the assets and liabilities of the Napico business, resulting in gains that contributed to the increase in other, net in both years.
Income Tax Benefit
Certain of our operations, including property management and risk management, are conducted through TRS entities. Additionally, some of our apartment communities are owned through TRS entities.
Our income tax benefit calculated in accordance with GAAP includes: (a) historic tax credits that offset income tax obligations of our TRS entities; (b) income taxes associated with the income or loss of our TRS entities, for which the tax consequences have been realized or will be realized in future periods; and (c) low income housing tax credits that offset REIT taxable income, primarily from retained capital gains. Income taxes related to these items (before gains on dispositions) are included in income tax benefit in our consolidated statements of operations.
Income tax benefit for the periods presented also reflects GAAP taxes associated with income and gains related to the Napico business, which was partially deconsolidated in 2016 and for which the final property was deconsolidated in 2017.
For the year ended December 31, 2017 compared to 2016, income tax benefit increased by $6.9 million, from $25.2 million to $32.1 million. The increase is primarily due to higher tax benefit associated with low-income housing tax credits from our September 2016 acquisition of the limited partner interests in a tax credit partnership, higher net operating losses at the TRS entities (including the La Jolla Cove impairment loss discussed above) and the $0.5 million net tax benefit we recognized as a result of the December 2017 tax reform legislation (as further discussed in Note 9 to the consolidated financial statements in Item 8). These increases were partially offset by a decrease in historic tax credits associated with the redevelopment of certain apartment communities, including the timing of final certification on one redevelopment in 2016.
For the year ended December 31, 2016 compared to 2015, income tax benefit decreased by $2.3 million, primarily due to lower net losses recognized by apartment communities owned by our TRS entities, partially offset by higher historic tax credits associated with the redevelopment of certain apartment communities and higher tax benefit associated with low-income housing tax credits from our acquisition of the limited partner interests in a tax credit partnership.

NAPICO property.
Gain on Dispositions of Real Estate Net of Tax
The table below summarizes dispositions of apartment communities from our Real Estate portfolio and of consolidated partnerships served by our Asset Management business during the years ended 2018, 2017 and 2016 (dollars in millions):
 December 31, December 31,
 2017 2016 2015 2018 2017 2016
Real Estate            
Number of apartment communities sold 5
 7
 11
 4
 5
 7
Gross proceeds $397.0
 $517.0
 $404.3
 $242.3
 $397.0
 $517.0
Net proceeds (1) $385.3
 $511.0
 $229.4
 $235.7
 $385.3
 $511.0
Gain on disposition, net of tax $298.0
 $377.3
 $180.6
      
Asset Management      
Number of apartment communities sold 2
 1
 N/A
Gross proceeds $10.9
 $27.5
 N/A
Net proceeds (1) $5.0
 $13.2
 N/A
Gain on disposition, net of tax $1.6
 $16.5
 N/A
Gain on disposition $175.2
 $297.9
 $383.6
(1)
Net proceeds are after repayment of debt, if any, net working capital settlements, payment of transaction costs and debt prepayment penalties, if applicable.

The apartment communities sold from our Real Estate portfolio during 2018, 2017 2016 and 20152016 were primarily located outside of our primary markets or in lower-rated locations within our primary markets and had average revenues per apartment home significantly below those of our retained portfolio.
During the year ended December 31, 2018, we sold for $590 million our Asset Management business and our four Hunters Point communities. Please refer to Note 3 to the consolidated financial statements in Item 8 for further details regarding this sale.
Income Tax Benefit
Certain of our operations, including property management and risk management, are conducted through taxable REIT subsidiaries, or TRS entities. Additionally, some of our apartment communities are owned through TRS entities.
Our income tax benefit calculated in accordance with GAAP includes: (a) income taxes associated with the income or loss of our TRS entities, for which the tax consequences have been realized or will be realized in future periods; (b) low income housing tax credits generated prior to the sale of our Asset Management business that offset REIT taxable income, primarily from retained capital gains; and (c) historic tax credits that offset income tax obligations of our TRS entities. Income taxes related to these items, as well as changes in valuation allowance and the establishment of incremental deferred tax items in conjunction with intercompany asset transfers (if applicable), are included in income tax benefit in our consolidated statements of operations.
For the year ended December 31, 2018 compared to 2017, income tax benefit decreased by $17.8 million, from $30.8 million to $13.0 million. The decrease is primarily due to the reversal of a $19.3 million net tax benefit we recognized as a result of the December 2017 tax reform legislation in 2017 (as further discussed in Note 9 to the consolidated financial statements in Item 8) and higher tax expense related to gains on sale of real estate for communities held through TRS entities.
For the year ended December 31, 2017 compared to 2016, income tax benefit increased by $12.0 million, from $18.8 million to $30.8 million. The increase is primarily due to lower tax expense on the gains of sale of apartment communities, higher net operating losses at the TRS entities (including the La Jolla Cove impairment loss discussed above), higher tax benefit associated with low-income housing tax credits, and the $0.5 million net tax benefit we recognized for December 2017 tax reform legislation (as further discussed in Note 9 to the consolidated financial statements in Item 8).
Noncontrolling Interests in Consolidated Real Estate Partnerships
Noncontrolling interests in consolidated real estate partnerships reflects the results of our consolidated real estate partnerships allocated to the owners who are not affiliated with Aimco. The amounts of income or loss of our consolidated real estate partnerships that we allocate to owners not affiliated with Aimco include their share of property management fees, interest on notes and other amounts that we charge to these partnerships.
For the years ended December 31, 2018, 2017 2016 and 2015,2016, we allocated net income of $8.2 million, $9.1 million, $25.3 million, and $4.8$25.3 million, respectively, to noncontrolling interests in consolidated real estate partnerships. The amount of net income allocated to noncontrolling interests was driven by three primary factors: the operations of the consolidated apartment communities; gains on

the sale of apartment communities with noncontrolling interest holders; and the results of operations of the NapicoNAPICO business, as further discussed below.
The amount of net income allocated to noncontrolling interests resulting from operations of the consolidated apartment communities was $0.3 million, $2.4 million $4.4 million and $4.2$4.4 million for the years ended December 31, 2018, 2017 2016 and 2015, respectively. The decrease from 2016 to 2017 is primarily due to the June 30, 2017 reacquisition of our limited partner’s interest in the Palazzo joint venture.2016.
Gains on the sale of apartment communities allocated to noncontrolling interests totaled $7.9 million, $7.3 million $13.0 million and $6.0$13.0 million for the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively.
As discussed in Note 3 to the consolidated financial statements in Item 8, weWe derecognized the NapicoNAPICO business in two transactions, which occurred in 20162017 and 2017.2016. We allocated an $8.1 million of the gain on sale and a $0.6 million net loss, respectively, to the noncontrolling interest holders in connection with the 2017 and 2016 transactions. In 2015, we allocated a net loss of $5.4 million to the noncontrolling interest holders from the results of Napico operations.
Net Income Attributable to Aimco Preferred Stockholders and the Aimco Operating Partnership’s Preferred Unitholders
Net income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders decreased by $3.4 million and $2.9 million, respectively, during the year ended December 31, 2017 as compared to 2016. These decreases were primarily due to Aimco’s redemption of its Class Z Preferred Stock in 2016.
Noncontrolling Interests in Aimco Operating Partnership
In connection withAimco’s consolidated financial statements, noncontrolling interests in the redemption, we wrote off previously deferred issuance costs of $1.3 million. Additionally,Aimco Operating Partnership reflects the $0.7 million excessresults of the redemption value overAimco Operating Partnership that are allocated to the

carrying amount was reflected OP Unit holders. Allocations to noncontrolling interests in the Aimco Operating Partnership fluctuate in proportion to variations in net income, attributableas described above. For the year ended December 31, 2018 compared to Aimco Preferred Stockholders and2017, net income allocated to noncontrolling interests in the Aimco Operating Partnership’s Preferred UnitholdersPartnership increased $20.0 million primarily due to the increase in net income, as well as an increase in the percentage allocated following the issuance of OP Units as partial consideration for the acquisition of the four Philadelphia properties, discussed further in Note 3 to the consolidated financial statements. Net income allocated to noncontrolling interests in the Aimco Operating Partnership for the year ended December 31, 2016.
Net income attributable to Aimco preferred stockholders and the Aimco Operating Partnership’s preferred unitholders increased by $0.22017 decreased $5.9 million and $0.5 million, respectively, during the year ended December 31, 2016 as compared to 2015. These increases were primarily2016 due to Aimco’s redemption of its Class Z Preferred Stock described above, which resultedthe decrease in $2.0 million of redemption related charges, partially offset by $1.1 million of lower dividends.net income between the periods.
Critical Accounting Policies and Estimates
We prepare our consolidated financial statements in accordance with GAAP, which requires us to make estimates and assumptions. We believe that the following critical accounting policies involve our more significant judgments and estimates used in the preparation of our consolidated financial statements.
Capitalized Costs
We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopments and developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with the planning, execution and control of all capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopments and developments are in progress. We commence capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, at the point in time when activities necessary to get apartment communities ready for their intended use begin. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the apartment communities or components thereof are substantially complete and ready for their intended use, which is typically when construction has been completed and apartment homes are available for occupancy. We charge costs including ordinary repairs, maintenance and resident turnover costs to property operating expense, as incurred. Refer to the discussion of investing activities within the Liquidity and Capital Resources section for a summary of costs capitalized during the periods presented.
Impairment of Long-Lived Assets
Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the estimated aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community.

As part of our portfolio strategy, we seek to sell up to 10% of our portfolio annually and to reinvest the proceeds from such sales in accretive uses such as capital enhancements, redevelopments, occasional developments, and selective acquisitions with projected Free Cash Flow internal rates of return higher than expected from the communities being sold. As we execute this strategy, we evaluate alternatives to sell or reduce our interest in apartment communities that do not align with our long-term investment strategy, although there is no assurance that we will sell or reduce our investment in such apartment communities during the desired time frame. For any apartment communities that are sold or meet the criteria to be classified as held for sale during the next 12 months, the reduction in the estimated holding period for these apartment communities may result in impairment losses.
Non-GAAP Measures
Various of the key financial indicators we use in managing our business and in evaluating our financial condition and operating performance are non-GAAP measures. Key non-GAAP measures we use are defined and described below, and for those non-GAAP financial measures used or disclosed within this annual report, reconciliations of the non-GAAP financial measures to the most comparable financial measure computed in accordance with GAAP are provided.
We measure our long-term total return using Economic Income, which is a non-GAAP financial measure and is defined and further described below under the Economic Income heading.
Funds from Operations, or FFO, Pro forma Funds From OperationsFFO and Adjusted Funds From OperationsFFO, or AFFO, are non-GAAP financial measures, which are defined and further described below under the Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations heading. Economic Income and
Net Asset Value, are non-GAAP financial measures defined and further described below under the Economic Income heading.

or NAV, Free Cash Flow, or FCF, as calculated for our retained portfolio, represents an apartment community’s property net operating income, or NOI, less spending for capital replacements,Capital Replacements, which represents our estimation of the capital additions made to replace capital assets consumed during our ownership period (further discussed under the Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations heading and the Liquidity and Capital Resources heading). FCF margin as calculated for apartment communities sold represents anthe sold apartment community’s NOI less $1,200 per apartment home of assumed annual capital replacement spending, as a percentage of the apartment community’s rental and other property revenues. Capital replacement spending isrepresents a method of measuring the costmeasure of capital asset usage during the period; therefore, we believe that FCF is useful to investors as a supplemental measure of apartment community performance because it takes into consideration costs incurred during the period to replace capital assets that have been consumed during our ownership.
Funds From Operations and Adjusted Funds From Operations
Funds From Operations, or FFO, is a non-GAAP financial measure that we believe, when considered with the financial statements determined in accordance with GAAP, is helpful to investors in understanding our performance because it captures features particular to real estate performance by recognizing that real estate generally appreciates over time or maintains residual value to a much greater extent than do other depreciable assets such as machinery, computers or other personal property. The National Association of Real Estate Investment Trusts, or NAREIT, defines FFO as net income or loss computed in accordance with GAAP, excluding gains from sales of, and impairment losses recognized with respect to, depreciable real estate, plus depreciation and amortization related to real estate, and after adjustments for unconsolidated partnerships and joint ventures. Adjustments for unconsolidated partnerships and joint ventures are calculated on the same basis to determine FFO. We calculate FFO attributable to Aimco common stockholders (diluted) by subtracting, if dilutive, redemption or repurchase related preferred stock issuance costs and dividends on preferred stock.
In addition to FFO, we compute Pro forma FFO and Adjusted FFO, or AFFO, which are also non-GAAP financial measures that we believe are helpful to investors in understanding our performance. Pro forma FFO represents FFO attributable to Aimco common stockholders (diluted), excluding preferred equity redemption-related amounts (adjusted for noncontrolling interests). Preferred equity redemption-related amounts (gains or losses) are items that periodically affect our operating results and we exclude these items from our calculation of Pro forma FFO because such amounts are not representative of our operating performance.
Additionally in 2017, we recognized a net tax benefit associated with the December 2017 tax reform legislation consisting of a benefit related to the revaluation of net deferred tax liabilities of Aimco’s taxable REIT subsidiaries, partially offset by a valuation allowance related to deferred tax assets. We excluded this net tax benefit from our computation of Pro forma FFO because this type of tax benefit occurs infrequently and is not representative of our operating performance.
AFFO represents Pro forma FFO reduced by Capital Replacements (also adjusted for noncontrolling interests), which represents our estimation of the capital additions made to replace capital assets consumed during our ownership period. When we make capital additions at an apartment community, we evaluate whether the additions extend the useful life of an asset as compared to its condition at the time we purchased the apartment community. We classify as Capital Improvements those capital additions that meet these criteria and we classify as Capital Replacements those that do not. AFFO is a key financial indicator we use to evaluate our operational performance and is one of the factors that we use to determine the amounts of our dividend payments.
FFO, Pro forma FFO and AFFO should not be considered alternatives to net income (loss), as determined in accordance with GAAP, as indications of our performance. Although we use these non-GAAP measures for comparability in assessing our performance compared to other REITs, not all REITs compute these same measures and those who do may not compute them in the same manner. Additionally, computation of AFFO is subject to our definition of Capital Replacement spending. Accordingly, there can be no assurance that our basis for computing these non-GAAP measures is comparable with that of other REITs.

For the years ended December 31, 2017, 2016 and 2015, Aimco’s FFO, Pro forma FFO and AFFO are calculated as follows (in thousands):
 2017 2016 2015
Net income attributable to Aimco common stockholders (1)$306,861
 $417,781
 $235,966
Adjustments:     
Real estate depreciation and amortization, net of noncontrolling partners’ interest352,109
 314,840
 288,611
Gain on dispositions and other, net of noncontrolling partners’ interest(262,583) (381,131) (174,797)
Income tax provision related to gain on disposition of real estate(8,265) 6,374
 1,758
Common noncontrolling interests in Aimco Operating Partnership’s share of above adjustments (2)(3,810) 2,782
 (5,548)
Amounts allocable to participating securities(81) 88
 (473)
FFO attributable to Aimco common stockholders – diluted$384,231
 $360,734
 $345,517
Revaluation of deferred tax accounts, net of common noncontrolling interests in Aimco Operating Partnership and participating securities(498) 
 
Preferred equity redemption related amounts, net of common noncontrolling interests in Aimco Operating Partnership and participating securities
 1,877
 658
Pro forma FFO attributable to Aimco common stockholders – diluted$383,733
 $362,611
 $346,175
Capital Replacements, net of common noncontrolling interests in Aimco Operating Partnership and participating securities(51,760) (55,289) (53,925)
AFFO attributable to Aimco common stockholders – diluted$331,973
 $307,322
 $292,250
Weighted average common shares outstanding – diluted (FFO, Pro forma FFO and
AFFO) (3)
156,796
 156,391
 155,570
      
Net income attributable to Aimco per common share – diluted$1.96
 $2.67
 $1.52
FFO per share – diluted$2.45
 $2.31
 $2.22
Pro Forma FFO per share – diluted$2.45
 $2.32
 $2.23
AFFO per share – diluted$2.12
 $1.97
 $1.88
(1)
Represents the numerator for calculating Aimco’s earnings per common share in accordance with GAAP (see Note 10 to the consolidated financial statements in Item 8).
(2)
During the years ended December 31, 2017, 2016 and 2015, the Aimco Operating Partnership had outstanding, on average, 7,422,334, 7,760,597 and 7,656,626 common OP Units.
(3)Represents the denominator for Aimco’s earnings per common share – diluted, calculated in accordance with GAAP.
Refer to the Executive Overview for discussion of our Pro forma FFO and AFFO results for 2017, as compared to their comparable periods in 2016.
Refer to the Liquidity and Capital Resources section for further information regarding our capital investing activities, including Capital Replacements.
The Aimco Operating Partnership does not separately compute or report FFO, Pro forma FFO or AFFO. However, based on Aimco’s method for allocation of such amounts to noncontrolling interests in the Aimco Operating Partnership, as well as the limited differences between Aimco’s and the Aimco Operating Partnership’s net income amounts during the periods presented, FFO, Pro forma FFO and AFFO amounts on a per unit basis for the Aimco Operating Partnership would be expected to be substantially the same as the corresponding per share amounts for Aimco.
Economic Income
Economic Income represents stockholder value creation as measured by the change in estimated NAV per share plus cash dividends per share. We believe Economic Income is important to investors as it represents a measure of the total return we have earned for our stockholders. NAV, as used in our calculation of Economic Income, is a non-GAAP measure and represents the estimated fair value of assets net of liabilities attributable to Aimco’s common stockholders and the Aimco Operating Partnership’s common unitholders on a diluted basis. We believe NAV is considered useful by some investors in real estate companies because the value of company assets can be readily estimated, even for non-earning assets such as land or properties under development. NAV has the advantage of incorporating the investment decisions of thousands of real estate investors. We believe it enhances comparability among companies that have differences in their accounting. While NAV is not identical to liquidation value in that some costs and benefits are disregarded, it is often considered a floor with upside for value ascribed to the operating platform.

NAV also provides an objective basis for the perceived quality and predictability of future cash flows as well as their expected growth as these are factors considered by real estate investors.
Our estimated NAV per share and the quoted share price of Aimco Common Stock are not necessarily equal. Although we use Economic Income and NAV for comparability in assessing our value creation compared to other REITs, not all REITs publish these measures and those who do may not compute them in the same manner. Accordingly, there can be no assurance that our basis for computing these measures is comparable with that of other REITs.
We report NAV on a semiannual basis, as of the end of the first and third quarters. Economic Income for 2017,2018 was calculated using the change in NAV per share between September 30, 20162017 and 2017.2018. NAV will fluctuate over time. This NAV information should not be relied upon as representative of the amount a stockholder could expect to receive in a liquidation event, now or in the future. Certain assets are excluded as are certain liabilities, such as taxes and transaction costs associated with a liquidation. In addition, NAV is based on management’s subjective judgments, assumptions and opinions as of the date of determination. We assume no obligation to revise or update NAV to reflect subsequent or future events or circumstances. Our NAV estimate is subject to a variety of risks and uncertainties, many of which are beyond our control, including, without limitation, those described in Item 1A. Risk Factors.

A reconciliation of NAV to Aimco’s total equity, which we believe is the most directly comparable GAAP measure, as of September 30, 2017,2018, is provided below (in millions, except per share data):
Total equityTotal equity  $1,436
Total equity  $2,194
Fair value adjustment for Real Estate portfolioFair value adjustment for Real Estate portfolio   Fair value adjustment for Real Estate portfolio   
Less: consolidated real estate, at depreciated cost $(5,543)  Less: consolidated real estate, at depreciated cost $(5,731)  
Plus: fair value of real estate (1)   Plus: fair value of real estate (1)   
Stabilized portfolio fair value (2)$10,059
   Stabilized portfolio fair value (2)$10,806
   
Non-stabilized portfolio fair value (3)2,741
   Non-stabilized portfolio fair value (3)2,052
   
Total real estate at fair value
12,800
  Total real estate at fair value
12,858
  
Adjustment to present real estate at fair value  7,257
Adjustment to present real estate at fair value  7,127
Fair value adjustment for total indebtednessFair value adjustment for total indebtedness   Fair value adjustment for total indebtedness   
Plus: consolidated total indebtedness, net related to Real Estate portfolio 4,162
  Plus: consolidated total indebtedness, net related to Real Estate portfolio 3,647
  
Less: fair value of indebtedness related to real estate shown above (4) (4,232)  Less: fair value of indebtedness related to real estate shown above (4) (3,591)  
 Adjustment to present indebtedness at fair value  (70) Adjustment to present indebtedness at fair value  56
Plus: fair value of Asset Management business (5)  213
Adjustments to present other tangible assets, liabilities and preferred equity at fair value (6)  (189)
Adjustments to present other tangible assets, liabilities and preferred equity at fair value (5)Adjustments to present other tangible assets, liabilities and preferred equity at fair value (5)  (155)
Estimated NAVEstimated NAV  $8,647
Estimated NAV  $9,222
Total shares, units and dilutive share equivalents (7)  164
Total shares, units and dilutive share equivalents (6)  166
Estimated NAV per weighted average common share and unit - dilutedEstimated NAV per weighted average common share and unit - diluted  $53
Estimated NAV per weighted average common share and unit - diluted  $56
(1)We compute NAV by estimating the value of our communities, using methods we believe are appropriate based on the characteristics of the communities. For purposes of estimating NAV, real estate at fair value disclosed above includes wholly owned apartment communities plus our proportionate share of communities held by non-wholly owned entities (both consolidated and unconsolidated), and excludes the estimated fair value of communities that are part of the Asset Management business. The value of Asset Management communities is factored into the valuation of the Asset Management portfolio as described in footnote 5.. A reconciliation of our consolidated apartment communities to those communities included in total real estate at fair value in the table above is as follows:
Consolidated apartment communities as of September 30, 20172018176129
Less: Consolidated communities in the Asset Management portfolio(39)
Plus: Unconsolidated apartment communities4
Apartment communities in total real estate at fair value for NAV141133
For valuation purposes at September 30, 2017,2018, we segregated these 141133 communities into the following categories: stabilized portfolio and non-stabilized portfolio.
(2)As of September 30, 2017,2018, our stabilized portfolio includes 123122 communities that had reached stabilized operations and were not expected to be sold within twelve months. We value this portfolio using a direct capitalization rate method based on the annualized proportionate property NOI for the three months ended September 30, 2017,2018, less a 2% management fee. Market property management fees range between 1.5% and 3.0% with larger, higher quality portfolios at the lower end of that range. The weighted average estimated capitalization rate as applied to the annualized property NOI was 5.1%4.96%, which we calculate on a property-by-property basis, based primarily on information published by a third-party. Community characteristics that we use to determine comparable market capitalization rates include: the market in which the community is located; infill or suburban location within the market; property quality grade; and whether the community is stabilized or value-add. We used this valuation method for approximately 84% of real estate fair value at September 30, 2018.

primarily on information published by a third-party. Community characteristics that we use to determine comparable market capitalization rates include: the market in which the community is located; infill or suburban location within the market; property quality grade; and whether the community is stabilized or value-add. We used this valuation method for approximately 79% of real estate fair value at September 30, 2017.
(3)The non-stabilized portfolio includes sevensix apartment communities under redevelopment or development at September 30, 2017 and two apartment communities in lease-up.2018. We valued these communities by discounting projected future cash flows. Key assumptions used to estimate the value of these communities include: revenues, which are based on in-place rents, projected submarket rent growth to community stabilization based on projections published by third parties and adjusted for the impacts of redevelopment; expenses, which are based on estimated operating costs adjusted for inflation and a management fee equal to 2% of projected revenue; estimated remaining costs to complete construction; and a terminal value based on current market capitalization rates plus five basis points per year from September 30, 20172018 to community stabilization. Discount rates applied to estimated future cash flows of these communities ranged between 6.00%6.30% and 7.15%6.40% depending on construction and lease-up progress.progress as of September 30, 2018. We used this valuation method for approximately 17%12% of the real estate fair value at September 30, 2017.2018. The non-stabilized portfolio also included ninefive recently acquired apartment communities under contract for sale, which were valued at sales contractpurchase price and certain land investments at Aimco’s carrying value that represent approximately 4% of real estate fair value at September 30, 2017.2018. Our calculation of NAV does not include such future values as air rights, the potential for increased density, nor the potential for completion of future phases of redevelopments.
(4)We calculate the fair value of indebtedness related to real estate as the carrying value of our non-recourse property debt adjusted for the mark-to-market liabilityasset on our fixed-rate property debt as of September 30, 2017,2018, plus the outstanding balances on the revolving line of credit and term loan, which approximate their fair value as of September 30, 2017.2018. The mark-to-market has been computed using a money-weighted average interest ratefair value of 4.15%, which rate takes into account the timing of amortization and maturities, and a market rate of 3.75%, which ratedebt takes into account the duration of the existing property debt, the loan-to-valueas well as its loan to value ratio and debt service coverage, as well as timing of amortization and maturities.coverage. For purposes of estimating NAV, the fair value of debt includes our proportionate share of debt related to non-wholly owned entities (both consolidated and unconsolidated), and excludes non-recourse property debt obligations of consolidated partnerships of the Asset Management business, which is factored into the valuation of the Asset Management business as described in footnote 5..

(5)We estimate our share of the fair value of the Asset Management business as the present value of the expected future cash flows of various low-income housing tax credit partnerships using a 7% discount rate. As further discussed in Note 2 to the consolidated financial statements in Item 8, the future cash flows we expect to receive include fees and other amounts to be paid from cash flows from the operation of the underlying communities and proceeds from sale of the underlying communities after repayment of any associated property-level debt. The key assumptions used to estimate the future cash flows we expect to receive include: operating cash flow, which is based on an estimate of contractual rents and expenses reflecting expected increases; the value of the underlying apartment communities, which we value using a direct capitalization rate method similar to that described in footnote 2 above; and the estimated sale date of the apartment communities, which is generally upon or shortly after the expiration of the tax credit compliance periods.
(6)Other tangible assets consist of cash, restricted cash, accounts receivable and other assets for which we reasonably expect to receive cash through the normal course of operations or another future event. Other tangible liabilities consist of accounts payable, accrued liabilities and other tangible liabilities we reasonably expect to settle in cash through the normal course of operations or another future event. Other tangible assets and liabilities were generally valued at their carrying amounts and reduced by the noncontrolling interests’ portion of these amounts and exclude intangible assets and liabilities reflected on our consolidated balance sheet. The fair value of our preferred stock is estimated as the closing share price on September 30, 2017,2018, less accrued dividends. Such accrued dividends are assumed to be accounted for in the closing share price and these amounts are also included in other tangible liabilities. For purposes of this NAV calculation, no realizable value has been assigned to goodwill or other intangible assets. Deferred income, which includes below market lease liabilities, recognized in accordance with GAAP in connection with the purchase of the related apartment communities, and cash received in prior periods and required to be deferred under GAAP, is excluded from this NAV calculation.
(7)(6)Total shares, units and dilutive share equivalents represents Common Stock, OP Units, participating unvested restricted shares and the dilutive effect of common stock equivalents outstanding as of September 30, 2017.2018.
Funds From Operations, Pro forma Funds From Operations and Adjusted Funds From Operations
FFO is a non-GAAP financial measure that we believe, when considered with the financial statements determined in accordance with GAAP, is helpful to investors in understanding our performance because it captures features particular to real estate performance by recognizing that real estate generally appreciates over time or maintains residual value to a much greater extent than do other depreciable assets such as machinery, computers or other personal property. The National Association of Real Estate Investment Trusts, or Nareit, defines FFO as net income computed in accordance with GAAP, excluding: depreciation and amortization related to real estate; gains and losses from sales and impairment of depreciable assets and land used in our primary business; and income taxes, current or deferred, directly associated with a gain or loss on sale of real estate, and including our share of the FFO of unconsolidated partnerships and joint ventures. Adjustments for unconsolidated partnerships and joint ventures are calculated on the same basis to determine FFO. We calculate FFO attributable to Aimco common stockholders (diluted) by subtracting dividends on preferred stock and amounts allocated from FFO to participating securities.
In addition to FFO, we compute Pro forma FFO and AFFO, which are also non-GAAP financial measures that we believe are helpful to investors in understanding our performance. Pro forma FFO represents FFO attributable to Aimco common stockholders (diluted), excluding preferred equity redemption-related amounts and certain other income or costs, adjusted for noncontrolling interests. Preferred equity redemption-related amounts (gains or losses) are items that periodically affect our operating results and we exclude these items from our calculation of Pro forma FFO because such amounts are not representative of our operating performance.
In computing 2018 Pro forma FFO, we made a number of adjustments. We were engaged in litigation with Airbnb, which was resolved during the year. Due to the unpredictable nature of these proceedings, related amounts recognized, net of income tax effect, have been excluded from Pro forma FFO. In connection with the sale of our Asset Management business, we incurred severance costs during 2018. We exclude such costs from Pro forma FFO because we believe these costs incurred are closely related to the sale of the business. We also excluded from Pro forma FFO the tax benefit due to the release of a valuation allowance. Due to the sale of the Asset Management business, we expect to realize our deferred tax benefits. As a result, we determined the valuation allowance recorded in connection with recognizing the effect of the 2017 tax reform is no longer necessary. We excluded the effect of the establishment of the valuation allowance from Pro forma FFO and as such have excluded the benefit from its release. We have also excluded the impact of tax reform. Finally, we addressed approximately half of our property loans maturing in 2019, 2020 and 2021. In connection with this activity, we incurred debt extinguishment costs, which we have excluded from Pro forma FFO.
AFFO represents Pro forma FFO reduced by Capital Replacements, which represents our estimation of the actual capital additions made to replace capital assets consumed during our ownership period. When we make capital additions at an apartment community, we evaluate whether the additions extend the useful life of an asset as compared to its condition at the time we purchased the apartment community. We classify as Capital Improvements those capital additions that meet these criteria, and we classify as Capital Replacements those that do not. AFFO is a key financial indicator we use to evaluate our operational performance and is one of the factors that we use to determine the amounts of our dividend payments.
FFO, Pro forma FFO and AFFO should not be considered alternatives to net income, as determined in accordance with GAAP, as indications of our performance. Although we use these non-GAAP measures for comparability in assessing our performance compared to other REITs, not all REITs compute these same measures and those who do may not compute them in the same manner. Additionally, computation of AFFO is subject to our definition of Capital Replacement spending. Accordingly, there can be no assurance that our basis for computing these non-GAAP measures is comparable with that of other REITs.

For the years ended December 31, 2018, 2017 and 2016, Aimco’s FFO, Pro forma FFO and AFFO are calculated as follows (in thousands):
 2018 2017 2016
Net income attributable to Aimco common stockholders (1)$656,597
 $306,861
 $417,781
Adjustments:     
Real estate depreciation and amortization, net of noncontrolling partners’ interest368,961
 352,109
 314,840
Gain on dispositions and other, net of noncontrolling partners’ interest(669,450) (262,583) (381,131)
Income tax adjustments related to gain on dispositions and other items (2)27,310
 (8,265) 6,374
Common noncontrolling interests in Aimco Operating Partnership’s share of above adjustments14,063
 (3,810) 2,782
Amounts allocable to participating securities402
 (81) 88
FFO attributable to Aimco common stockholders – diluted$397,883
 $384,231
 $360,734
Adjustments, all net of common noncontrolling interests in Aimco OP and participating securities:     
Preferred equity redemption related amounts
 
 1,877
Tax provision (benefit) related to tax reform legislation (3)273
 (498) 
Tax benefit due to release of valuation allowance (4)(19,349) 
 
Litigation, net (5)(8,558) 
 
Severance costs (6)1,282
 
 
Prepayment penalties, net (7)14,089
 
 
Pro forma FFO attributable to Aimco common stockholders – diluted$385,620
 $383,733
 $362,611
Capital Replacements, net of common noncontrolling interests in Aimco Operating Partnership and participating securities(48,493) (51,760) (55,289)
AFFO attributable to Aimco common stockholders – diluted$337,127
 $331,973
 $307,322
Weighted average common shares outstanding – diluted (FFO, Pro forma FFO and
AFFO) (8)
156,053
 156,796
 156,391
      
Net income attributable to Aimco per common share – diluted$4.21
 $1.96
 $2.67
FFO per share – diluted$2.55
 $2.45
 $2.31
Pro Forma FFO per share – diluted$2.47
 $2.45
 $2.32
AFFO per share – diluted$2.16
 $2.12
 $1.97
(1)
Represents the numerator for calculating Aimco’s earnings per common share in accordance with GAAP (see Note 10 to the consolidated financial statements in Item 8).
(2)For the year ended December 31, 2018, income taxes related to gain on dispositions and other items includes tax on the gain on the sale of the Asset Management business, as well as tax on the gain on the sale of apartment communities during the year ended December 31, 2018.
(3)In connection with the Tax Cuts and Jobs Act signed into law in December 2017, we recognized income tax benefit during 2017 and adjusted the estimated impact of tax reform upon the conclusion of our analysis of the effects during 2018. We have excluded such amounts from Pro forma FFO.
(4)Due to the sale of the Asset Management business, we expect to realize our deferred tax benefits. As a result, we have determined that a valuation allowance is no longer necessary. We excluded the effect of the establishment of the valuation allowance from Pro forma FFO and as such have excluded the benefit from its release.
(5)During 2018, we were engaged in litigation with Airbnb, which was resolved during the year. Due to the unpredictable nature of these proceedings, related amounts recognized, net of income tax effect, have been excluded from Pro forma FFO.
(6)We incurred severance costs in connection with the sale of our Asset Management business. We exclude such costs from Pro forma FFO because we believe these costs are closely related to the sale of the business.
(7)In connection with 2018 refinancing activity undertaken related to property-level debt scheduled to mature in 2019, 2020 and 2021, we incurred debt extinguishment costs, net of income tax effect, which have been excluded from Pro forma FFO.
(8)Represents the denominator for Aimco’s earnings per common share – diluted, calculated in accordance with GAAP.
Refer to the Executive Overview for discussion of our Pro forma FFO and AFFO results for 2018, as compared to their comparable periods in 2017.

Refer to the Liquidity and Capital Resources section for further information regarding our capital investing activities, including Capital Replacements.
The Aimco Operating Partnership does not separately compute or report FFO, Pro forma FFO or AFFO. However, based on Aimco’s method for allocation of such amounts to noncontrolling interests in the Aimco Operating Partnership, as well as limited differences between the amounts of net income attributable to Aimco’s common stockholders and the Aimco Operating Partnership’s unit holders during the periods presented, FFO, Pro forma FFO and AFFO amounts on a per unit basis for the Aimco Operating Partnership would be expected to be substantially the same as the corresponding per share amounts for Aimco.
Leverage Ratios
As discussed under the Balance Sheet and Liquidity heading, as part of our leverage strategy, we target the ratio of Proportionate Debt and Preferred Equity to Adjusted EBITDA to be below 7.0x and we target the ratio of Adjusted EBITDA to Adjusted Interest Expense and Preferred Dividends to be greater than 2.5x. We believe these ratios are important measures as they are commonly used by investors and analysts to assess the relative financial risk associated with balance sheets of companies within the same industry, and they are believed to be similar to measures used by rating agencies to assess entity credit quality.
We calculate Adjusted EBITDA and Adjusted Interest Expense used in our leverage ratios based on the most recent three month amounts, annualized.
Proportionate Debt, as used in our leverage ratios, is a non-GAAP measure and includes our share of the long-term, non-recourse property debt secured by apartment communities in the Real Estate portfolio our term loan, and outstanding borrowings under our revolving credit facility, reduced by our share of the cash and restricted cash of our consolidated and unconsolidated partnerships owning communities in our Real Estate portfolio, and also by our investment in the subordinate tranches of a securitization trust that holds certain of our property debt, (essentially,which is essentially an investment in our own non-recourse property loans).loans.
In our Proportionate Debt computation, we increase our recorded debt by unamortized debt issue costs because these amounts represent cash expended in earlier periods and do not reduce our contractual obligations, and we reduce our recorded debt obligations by the amounts of cash and restricted cash on-hand (such restricted cash amounts beingwhich are primarily restricted under the terms of

our property debt agreements)agreements, assuming these amounts would be used to reduce our outstanding leverage. We further reduce our recorded debt by the value of our investment in a securitization trust that holds certain of our property debt, as our payments of principal and interest associated with such property debt will ultimately repay our investments in the trust.
We exclude from our leverage the non-recourse property debt obligations of consolidated partnerships served by our Asset Management business. The non-recourse property debt obligations of these partnerships are not our obligations and have limited effect on the amount of fees and other payments we expect to receive.
We believe Proportionate Debt is useful to investors as it is a measure of our net exposure to debt obligations. Proportionate Debt, as used in our leverage ratios, is calculated as set forth in the table below.
Preferred Equity, as used in our leverage ratios, represents the redemption amounts for Aimco’s preferred stock and the Aimco Operating Partnership’s preferred OP Units. Preferred Equity, although perpetual in nature, is another component of our overall leverage.
Adjusted EBITDA is a non-GAAP measure. We believe Adjusted EBITDA provides investors relevant and useful information because it allows investors to view income from our operations on an unleveraged basis, before the effects of taxes, depreciation and amortization, gains or losses on sales of and impairment losses related to real estate, and various other items described below.
Adjusted EBITDA represents Aimco’s share of the consolidated amount of our net income, adjusted to exclude the effect of the following items for the reasons set forth below:
Adjusted Interest Expense, defined below, to allow investors to compare a measure of our earnings before the effects of our indebtedness with that of other companies in the real estate industry;
preferred dividends, to allow investors to compare a measure of our performance before the effects of our capital structure and indebtedness with that of other companies in the real estate industry;
income taxes, to allow investors to measure our performance independent of income taxes, which may vary significantly from other companies within our industry due to leverage and tax planning strategies, among other factors;
depreciation and amortization, gains or losses on dispositions and impairment losses related to real estate, for similar reasons to those set forth in our discussion of FFO, Pro forma FFO and AFFO in the preceding section; and
other items, including gains on dispositions of non-depreciable assets, as these are items that periodically affect our operations but that are not necessarily representative of our ability to service our debt obligations.

While Adjusted EBITDA is a relevant measure of performance and is commonly used in leverage ratios, it does not represent net income as defined by GAAP, and should not be considered as an alternative to net income in evaluating our performance. Further, our definition and computation of Adjusted EBITDA may not be comparable to similar measures reported by other companies.

Adjusted Interest Expense, as calculated in our leverage ratios, is a non-GAAP measure that we believe is meaningful for investors and analysts as it presents our share of current recurring interest requirements associated with leverage. Our calculation of Adjusted Interest Expense is set forth in the table below. Adjusted Interest Expense represents our proportionate share of interest expense on non-recourse property debt encumbering apartment communities in the Real Estate portfolio and interest expense on our term loan and revolving credit facility borrowings. We exclude from our calculation of Adjusted Interest Expense:
debt prepayment penalties, which are items that, from time to time, affect our operating results, but are not representative of our scheduled interest obligations;
the amortization of debt issue costs, as these amounts have been expended in previous periods and are not representative of our current or prospective debt service requirements; and
the income we receive on our investment in the securitization trust that holds certain of our property debt, as this income is being generated indirectly from interest we pay with respect to property debt held by the trust.
Preferred Dividends represents the preferred dividends paid on Aimco’s preferred stock and the preferred distributions paid on the Aimco Operating Partnership’s preferred OP Units, exclusive of preferred equity redemption related amounts. We add Preferred Dividends to Adjusted Interest Expense for a more complete picture of the interest and dividend requirements of our leverage, inclusive of perpetual preferred equity.

Reconciliations of the most closely related GAAP measures to our calculations of Proportionate Debt, Preferred Equity, Adjusted EBITDA, Adjusted Interest Expense and Preferred Dividends, as used in our leverage ratios, are as follows (in thousands):
December 31, 2017December 31, 2018
Total indebtedness associated with Real Estate portfolio$3,861,770
$4,075,665
Adjustments:  
Debt issue costs related to non-recourse property debt17,932
21,695
Debt issue costs related to term loan499
Debt related to assets classified as held for sale22,693
Proportionate share adjustments related to debt obligations of consolidated and unconsolidated partnerships(9,560)(9,533)
Cash and restricted cash(95,325)(72,595)
Proportionate share adjustments related to cash and restricted cash held by consolidated and unconsolidated partnerships1,271
912
Securitization trust investment and other(82,794)(88,457)
Proportionate Debt$3,693,793
$3,950,380
  
Preferred stock$125,000
$125,000
Preferred OP Units101,537
101,291
Preferred Equity226,537
226,291
Proportionate Debt and Preferred Equity$3,920,330
$4,176,671
Three Months Ended
Three Months Ended December 31, 2017December 31, 2018
Net income attributable to Aimco Common Stockholders$262,097
$5,226
Adjustments:  
Adjusted Interest Expense42,219
38,424
Income tax benefit(17,248)(409)
Depreciation and amortization, net of noncontrolling interest97,418
91,249
Gain on dispositions and other, net of income taxes and noncontrolling partners’ interests(255,516)
Gain on dispositions and other, inclusive of related income taxes and net of noncontrolling partners’ interests2,311
Preferred stock dividends2,149
2,148
Net income attributable to noncontrolling interests in Aimco Operating Partnership14,374
2,291
Pro forma adjustment (1)(4,248)3,342
Adjusted EBITDA$141,245
$144,582
  
Annualized Adjusted EBITDA$564,980
$578,328
 
(1) In our calculation of leverage ratios for the three months ended December 31, 2017, we adjusted our calculation of Adjusted EBITDA to reflect the disposition of five apartment communities sold during the period as if they had closed on October 1, 2017, because the proceeds from these sales were used to reduce leverage as of December 31, 2017.

(1)Our Adjusted EBITDA has been calculated on a pro forma basis to adjust for significant items impacting the three months ended December 31, 2018 for which annualization would distort the results.
Three Months Ended
Three Months Ended December 31, 2017December 31, 2018
Interest expense$49,193
$57,441
Interest expense related to non-recourse property debt obligations of consolidated partnerships served by our Asset Management business(3,166)
Interest expense attributable to Real Estate portfolio46,027
Adjustments:  
Proportionate share adjustments related to interest of consolidated and unconsolidated partnerships(105)(84)
Debt prepayment penalties and other non-interest items(496)(15,531)
Amortization of debt issue costs(1,393)(1,441)
Interest income earned on securitization trust investment(1,814)(1,961)
Adjusted Interest Expense$42,219
$38,424
  
Preferred stock dividends2,149
2,148
Preferred OP Unit distributions1,938
1,934
Preferred Dividends4,087
4,082
Adjusted Interest Expense and Preferred Dividends$46,306
$42,506
  
Annualized Adjusted Interest Expense$168,876
$153,696
Annualized Adjusted Interest Expense and Preferred Dividends$185,224
$170,024

Liquidity and Capital Resources
Liquidity
Liquidity is the ability to meet present and future financial obligations. Our primary source of liquidity is cash flow from our operations. Additional sources are proceeds from sales of apartment communities, proceeds from refinancings of existing property debt, borrowings under new property debt, borrowings under our Credit Agreement, as defined below, including our revolving credit facility and proceeds from equity offerings.
Our principal uses for liquidity include normal operating activities, payments of principal and interest on outstanding property debt, capital expenditures, dividends paid to stockholders, distributions paid to noncontrolling interest partners and acquisitions of apartment communities. We use our cash and cash equivalents and our cash provided by operating activities to meet short-term liquidity needs. In the event that our cash and cash equivalents and cash provided by operating activities are not sufficient to cover our short-term liquidity needs, we have additional means, such as short-term borrowing availability and proceeds from apartment community sales and refinancings. We may use our revolving credit facility for working capital and other short-term purposes, such as funding investments on an interim basis. We expect to meet our long-term liquidity requirements, such as debt maturities, redevelopment spending and apartment community acquisitions, through primarily non-recourse, long-term borrowings, (primarily non-recourse), the issuance of equity securities (including OP Units), the sale of apartment communities and cash generated from operations.
As of December 31, 2017,2018, our primary sources of liquidity were as follows:
$60.536.9 million in cash and cash equivalents;
$34.835.7 million of restricted cash, which consists primarily of escrows related to resident security deposits and reserves and escrows held by lenders for capital additions, property taxes and insurance; and
$521.3632.5 million of available capacity to borrow under our revolving credit facility (which is more fully described below), after consideration of outstanding borrowings of $67.2 million and $11.5$7.1 million of letters of credit backed by the facility.
At December 31, 2017,2018, we also held unencumbered apartment communities with an estimated fair market value of approximately $1.8 billion. Each of the amounts presented above exclude amounts attributable to partnerships served by our Asset Management business.$2.7 billion, up 50.0% from December 31, 2017.
Leverage and Capital Resources
The availability of credit and its related effect on the overall economy may affect our liquidity and future financing activities, both through changes in interest rates and access to financing. Currently, interest rates are low compared to historical levels and many lenders are active in the market. However, any adverse changes in the lending environment could negatively affect our

liquidity. We believe we have mitigated much of this exposure by reducing our short and intermediate term maturity risk through refinancing such loans with long-dated, fixed-rate property debt. However, if property financing options become unavailable for our further debt needs, we may consider alternative sources of liquidity, such as reductions in capital spending or proceeds from apartment community dispositions.
Two credit rating agencies rate our creditworthiness and both have rated our credit and outlook as BBB- (stable), an investment grade rating. Our investment grade rating would be useful in accessing capital through the sale of bonds in private or public transactions. However, our intention and historical practice has been to raise debt capital in the form of property-level, non-recourse, long-dated, fixed-rate, amortizing debt, the cost of which is generally less than that of recourse debt and the terms of which also provide for greater balance sheet safety.
AtAs of December 31, 2017,2018, approximately 86.7%91.0% of our leverage consisted of property-level, non-recourse, long-dated, amortizing debt. Approximately 97.7%93.4% of our property-level debt is fixed-rate, which provides a hedge against increases in interest rates, capitalization rates and inflation. The weighted average maturity of our property-level debt was 7.28.0 years.
For propertyOf our property-level debt, encumbering the communities in our Real Estate portfolio, $173.7$167.5 million of our unpaid principal balances mature during 2018, of which $111.5 million was refinanced in January 2018 with ten-year, fixed-rate, non-recourse property debt.2019. On average, 13.6%7.6% of our unpaid principal balances will mature each year from 20192020 through 2021.2022.
While our primary source of leverage is property-level, non-recourse, long-dated, fixed-rate, amortizing debt, we also have a Senior Secured Credit Agreementcredit facility with a syndicate of financial institutions, whichinstitutions. During the year ended December 31, 2018, we referexercised our $200.0 million expansion option on the credit facility, increasing the total capacity to as our Credit Agreement. Our Credit Agreement provides for $600.0 million of revolving loan commitments.$800.0 million. As of December 31, 2017,2018, we had $67.2$160.4 million of outstanding borrowings under our revolving loan commitments, representing 1.6%credit facility, which represented 3.7% of our total leverage. The Credit Agreement provides us with an option to expand the aggregate loan commitments, subject to customary conditions, by up to $200.0 million.
During 2017, we amended the Credit Agreement to add a $250.0 million term loan to fund partially our reacquisition of limited partner interests in the Palazzo joint venture. The term loan represents 6.1% of our total leverage as of December 31, 2017, matures on June 30, 2018, has a one-year extension option and bears interest at 30-day LIBOR plus 135 basis points.
As of December 31, 2017,2018, our outstanding perpetual preferred equity represented approximately 5.5%5.2% of our total leverage. Our preferred securities are perpetual in nature; however, for illustrative purposes, we compute the weighted average maturity of our total leverage assuming a 40-year maturity on our preferred securities.

The combination of non-recourse property level debt, borrowings under our Credit Agreementrevolving credit facility and perpetual preferred equity that comprises our total leverage, reduces our refunding and re-pricing risk. The weighted average maturity for our total leverage described above was 8.59.5 years as of December 31, 2017.2018.
Under the Credit Agreement,revolving credit facility, we have agreed to maintain a Fixed Charge Coverage ratio of 1.40x, as well as other covenants customary for similar revolving credit arrangements. For the year ended December 31, 2017,2018, our Fixed Charge Coverage ratio was 2.01x,2.05x, compared to ratio of 1.96x2.01x for the year ended December 31, 2016.2017. We expect to remain in compliance with this covenant during the next 12 months.
Changes in Cash, and Cash Equivalents and Restricted Cash
The following discussion relates to changes in consolidated cash, and cash equivalents and restricted cash due to operating, investing and financing activities, which are presented in our consolidated statements of cash flows in Item 8 of this report.
Operating Activities
For the year ended December 31, 2017,2018, our net cash provided by operating activities was $394.1$396.4 million. Our operating cash flow is affected primarily by rental rates, occupancy levels and operating expenses related to our portfolio of apartment communities. Cash provided by operating activities for the year ended December 31, 2017,2018, increased by $16.4$4.3 million compared to 2016,2017, due to improved operating results of our Same Store communities, contribution from acquired communities and increased contribution from redevelopment and lease-up communities, partially offset by a decrease in the net operating income associated with apartment communities we sold during 2016.

2018 and our sale of the Asset Management business.
Investing Activities
For the year ended December 31, 2017,2018, net cash provided by investing activities of $14.7$121.8 million consisted primarily of $402.2$708.8 million in proceeds from the saledisposition of the Asset Management business, four apartment communities located in the Hunters Point area of San Francisco, and four other apartment communities, partially offset by capital expenditures.
For the years ended December 31, 2017, 2016 and 2015, we sold and acquired variousacquisitions of Bent Tree Apartments, Avery Row, four apartment communities as further discussed in Note 3 to the consolidated financial statements in Item 8.Philadelphia, and capital expenditures.
Capital additions for our Real Estate segment totaled $338.0$338.8 million, $321.0$321.9 million and $340.3$312.8 million during the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively. We generally fund capital additions with cash provided by operating activities and cash proceeds from sales of apartment communities.
We categorize capital spending for communities in our Real Estate portfolio broadly into six primary categories:
capital replacements, which represent capital additions made to replace the portion of acquired apartment communities consumed during our period of ownership;
capital improvements, which represent capital additions made to replace the portion of acquired apartment communities consumed prior to our period of ownership;
capital enhancements, which may include kitchen and bath remodeling, energy conservation projects and investments in longer-lived materials designed to reduce turnover and maintenance costs, all of which are generally lesser in scope than redevelopment additions and do not significantly disrupt property operations;
redevelopment additions, which represent capital additions intended to enhance the value of the apartment community through the ability to generate higher average rental rates, and may include costs related to entitlement, which enhance the value of a community through increased density, and costs related to renovation of exteriors, common areas or apartment homes;
development additions, which represent construction and related capitalized costs associated with development of apartment communities; and
casualty capital additions, which represent construction and related capitalized costs incurred in connection with the restoration of an apartment community after a casualty event such as a severe snow storm, hurricane, tornado, flood or fire.
We exclude from these measures the amounts of capital spending related to apartment communities sold or classified as held for sale at the end of the period as well as amounts expended by consolidated partnerships served by our Asset Management business as such amounts generally do not affect the amount of cash flow we expect to receive from the operation and ultimate disposition of these communities.foregoing measures.

A summary of the capital spending for these categories, along with a reconciliation of the total for these categories to the capital expenditures reported in the accompanying consolidated statements of cash flows for the years ended December 31, 2018, 2017 2016 and 2015,2016, are presented below (dollars in thousands):
2017 2016 20152018 2017 2016
Real Estate          
Capital replacements$38,037
 $39,749
 $38,009
$37,472
 $34,892
 $38,088
Capital improvements17,039
 15,147
 16,759
16,055
 16,729
 14,922
Capital enhancements101,497
 74,544
 47,927
102,910
 91,360
 68,340
Redevelopment additions158,141
 155,399
 117,794
114,756
 156,140
 155,398
Development additions14,248
 31,823
 115,638
61,185
 14,249
 31,823
Casualty capital additions9,060
 4,304
 4,184
6,425
 8,556
 4,201
Real Estate capital additions338,022
 320,966
 340,311
338,803
 321,926
 312,772
Plus: additions related to consolidated Asset Management communities, apartment communities sold or held for sale, and other adjustments16,207
 17,548
 22,637
Plus: additions related to consolidated Asset Management communities and apartment communities sold or held for sale9,914
 32,303
 25,742
Consolidated capital additions354,229
 338,514
 362,948
348,717
 354,229
 338,514
Plus: net change in accrued capital spending3,875
 8,131
 4,232
(8,228) 3,875
 8,131
Capital expenditures per consolidated statement of cash flows$358,104
 $346,645
 $367,180
$340,489
 $358,104
 $346,645
For the years ended December 31, 2018, 2017 2016 and 2015,2016, we capitalized $7.6 million, $9.6$7.6 million and $11.7$9.6 million of interest costs, respectively, and $36.8 million, $36.0 million $32.9 million and $28.2$32.9 million of other direct and indirect costs, respectively.
Redevelopment/Development
Information regarding ourWe execute redevelopments and developmentsusing a range of approaches. We prefer to limit risk by executing redevelopments using a phased approach, in which we renovate an apartment community in stages. Smaller phases provide us the flexibility to maintain current earnings while aligning the timing of the completed apartment homes with market demand. The following table summarizes ongoing redevelopments of this nature at December 31, 2017, is presented below2018 (dollars in millions):
 Location Apartment Homes Approved for Redevelopment or Development Estimated Net Investment Inception-to-Date Net Investment Expected Stabilized Occupancy (1) Expected NOI Stabilization (1)
Under Redevelopment or Development          
Bay ParcMiami, FL 15
 $20.0
 $15.3
 (2) (2)
Calhoun Beach ClubMinneapolis, MN 275
 28.7
 9.4
 (3) (3)
Flamingo South BeachMiami, FL N/A
 9.7
 4.2
 (4) (4)
Palazzo at Park La BreaLos Angeles, CA 389
 24.5
 16.2
 2Q 2020 3Q 2021
Palazzo East at Park La BreaLos Angeles, CA 611
 28.0
 0.8
 4Q 2020 1Q 2022
Parc MosaicBoulder, CO 226
 117.0
 27.0
 4Q 2020 1Q 2022
Park Towne PlacePhiladelphia, PA 942
 176.0
 140.8
 1Q 2019 2Q 2020
Saybrook PointeSan Jose, CA 324
 18.3
 14.9
 1Q 2019 2Q 2020
YorktownLombard, IL 292
 25.7
 18.3
 (5) (5)
            
Lease-up complete, NOI stabilization period        
One CanalBoston, MA 310
 195.2
 195.2
   2Q 2018
The SterlingPhiladelphia, PA 534
 71.5
 71.0
   4Q 2018
Total  3,918
 $714.6
 $513.1
    
 Location Apartment Homes Approved for Redevelopment Estimated/Potential Net Investment Inception-to-Date Net Investment
Bay ParcMiami, FL 60
 $24.1
 $20.6
Calhoun Beach ClubMinneapolis, MN 275
 28.7
 10.5
Flamingo South BeachMiami Beach, FL 
 39.7
 14.2
Palazzo West at The GroveLos Angeles, CA 389
 24.5
 19.1
YorktownLombard, IL 292
 25.7
 20.0
OtherVarious 92
 12.9
 12.9
Total  1,108
 $155.6
 $97.3
(1)Redevelopments provide us with the flexibility to align the timing of completed apartment homes with market demand. As such, expected occupancy stabilization and expected NOI Stabilization dates may change as market conditions evolve.
(2)This phase of redevelopment encompasses common areas, amenity improvements, residential homes on one floor and the creation of a new retail space.
(3)In response to market conditions, during 2017, we decided to pause redevelopment activities pertaining to apartment homes and will reassess an appropriate time to resume such activity. Redevelopment of common areas, such as corridors, is ongoing and expected to be complete in early 2018.
(4)This phase of the redevelopment encompasses common areas and security system upgrades.
(5)In response to market conditions, during 2017, we decided to pause redevelopment activities and will reassess an appropriate time to resume redevelopment activity.

We also undertake ground-up development when warranted by risk-adjusted investment returns, either directly or in connection with the redevelopment of an existing apartment community. When smaller redevelopment phases are not possible, we may engage in redevelopment activities where an entire building or community is vacated. The following table summarizes our investments related to these developments and redevelopments at December 31, 2018 (dollars in millions):
 Location Apartment Homes Approved for Redevelopment or Development Estimated/Potential Net Investment Inception-to-Date Net Investment Stabilized Occupancy NOI Stabilization
The Fremont (formerly Anschutz Expansion)Denver, CO (MSA) 253
 $87.0
 $10.6
 3Q 2021 4Q 2022
Elm Creek TownhomesElmhurst, IL 58
 35.1
 11.3
 2Q 2021 3Q 2022
Parc MosaicBoulder, CO 226
 117.0
 68.9
 4Q 2020 1Q 2022
Park Towne PlacePhiladelphia, PA 940
 176.5
 172.9
 1Q 2019 2Q 2020
Total  1,477
 $415.6
 $263.7
    
Net investment represents the total actual or estimated investment, net of tax and other credits earned as a direct result of our redevelopment or development of the community. For phased redevelopments, potential net investment relates to the current phase of the redevelopment.
Stabilized Occupancy represents the period in which we expect to achieve stabilized occupancy, generally greater than 90%.
NOI Stabilization represents the period in which we expect the communities to achieve stabilized rents and operating costs, generally five quarters after occupancy stabilization.
During the year ended December 31, 2017, we invested $172.4 million primarilyOur total estimated or potential net investment in our ongoing redevelopment and development projects.is $571.2 million with a projected weighted average net operating income yield on these investments of 6.1%, assuming untrended rents. Of this total, $361.0 million has been funded. We expect to fund the remaining redevelopment and development investment through a combination of leverage and proceeds from community sales.
During the year ended December 31, 2017,2018, we completed construction on the third tower of Park Towne Placeinvested $175.9 million in Center City, Philadelphia. As of December 31, 2017, the first three towers combined were 89% leased with approximately 40 homes remaining to be leased at the third redeveloped tower to reach occupancy stabilization. Based on these results,redevelopment and development activities.
In Boulder, Colorado, we decided to proceed with a $40have invested $68.9 million redevelopment of the fourth and final tower. We have completed de-leasing and commenced construction on this tower, and lease-up is scheduled to commence in the springdevelopment of 2018.
Also in Center City Philadelphia, during the year ended December 31, 2017, we completed redevelopment and the lease-up of the 534 apartment homes at The Sterling and substantially completed the reconfiguration of the second floor commercial space, upgrades to the third and fourth floor commercial space and upgrades to residential common areas.

We have planned and entitledParc Mosaic, a new $117.0 million, 226226-unit apartment home community to be known as Parc Mosaic, located in Boulder, Colorado on the site of our Eastpointe community. As part of this plan, as of December 31, 2017, we completed the de-leasing of Eastpointe and commenced demolition and construction. The site is two miles from the new Google campus and is across the street from Ball Aerospace’s Technology Campus and Foothills Hospital. Building in Boulder is highly regulated and new supply is limited, notwithstanding higher enrollment at the University of Colorado and increased employment generally.
InclusiveAt the University of Colorado Anschutz Medical Campus, we exercised our option to acquire approximately two acres of land adjacent to our 21 Fitzsimons apartment community, and broke ground on the development of The Fremont, a 253-apartment home community. We expect to invest approximately $87.0 million to construct the community, which is expected to be ready for occupancy in late 2020.
We also commenced the next phase of redevelopment at our Flamingo community, located in Miami Beach, bringing our potential net new investment to $39.7 million. This phase includes extensive redevelopment of retail, leasing, and common areas, including major enhancements to the entryway.
In Center City, Philadelphia, we completed the redevelopment of Park Towne Place, and as of December 31, 2018, we had leased 95.6% of the apartment homes at the community. This multi-year redevelopment of 940 apartment homes, amenities, and development projects discussedcommon area spaces, was executed on plan and leased-up in-line with expectations with expected free cash flow returns of 9.2%.
In San Jose, we completed the redevelopment of Saybrook Pointe, a 324-apartment home, garden-style community. Construction was completed on-time and in-line with underwritten costs, and lease-up of the community finished ahead of schedule and at rates above duringunderwriting, increasing the expected free cash flow return to 14.3%, a 100 basis point outperformance to underwriting.
During the year ended December 31, 20172018, we expandedleased 457 apartment homes at our redevelopment and development pipeline by $228.9 million. The total estimated net investment for thesecommunities. At December 31, 2018, our exposure to lease-up at active redevelopment and development communities is $714.6 million, with a projected weighted average net operating income yield on these investmentswas approximately 366 apartment homes, of 6.1% assuming untrended rents. Aswhich 208 were being constructed at Parc Mosaic, and 158 were located in four other communities. Additionally, we expect to acquire One Ardmore in 2019 upon its completion, as part of December 31, 2017, $513.1 million of this total has been funded.the Philadelphia portfolio acquisition announced in April 2018. This acquisition will increase our exposure to lease-up risk by approximately 100 apartment homes.

We expect our total redevelopmentdevelopment and developmentredevelopment spending to range from $120$225 million to $200$275 million for the year ending December 31, 2018.2019.
Financing Activities
For the year ended December 31, 2017,2018, our net cash used in financing activities of $393.3$588.2 million was primarily attributed to our reacquisition of the limited partner interests in the Palazzo communities, dividends paid to common security holders, distributions paid to noncontrolling interests and principal payments on property loans, partially offset by proceeds from the term loan, net borrowings on our revolving credit facility, and proceeds from non-recourse property debt.items discussed below.
Net borrowings on our revolving credit facility primarily relate to the timing of property debt financing activities and apartment community dispositions. short-term working capital needs. During the year ended December 31, 2018, we repaid the $250.0 million term loan in full.
Proceeds from non-recourse property debt borrowings during the year consisted of the closing of seven14 fixed-rate, amortizing, non-recourse amortizing, property loans totaling $308.8$982.4 million. On a weighted basis, the term of these loans averaged 8.29.4 years and their interest rates averaged 3.48%4.03%, 121112 basis points more than the corresponding 10-year Treasury rate at the time of pricing. The net effect of 2018 fixed-rate property debt refinancing activities has been to lower our weighted average fixed interest rate by 42 basis points since December 31, 2017, to 4.22%.
We like the discipline of financing our investments in real estate through the use of fixed-rate, amortizing,Proceeds from non-recourse property debt asborrowing during the amortization gradually reducesperiod also included the closing of four non-recourse, variable-rate property loans totaling $245.6 million. On a weighted basis, the term of these loans averaged 5 years and the loans bear interest at a weighted average rate of 30-day LIBOR plus 1.20%. The five-year terms fill a void in our leverageladdered maturities and, reducestaken together with the repayment of the variable-rate term loan, reduce our refunding risk, the fixed-rate provides a hedge against increases inexposure to changing short-term interest rates and the non-recourse feature avoids entity risk.to approximately 9.75% of our leverage.
Principal payments on property loans during the year totaled $409.2$976.1 million, consisting of $85.1$82.4 million of scheduled principal amortization and repayments of $324.1$893.7 million.
Aimco common share repurchase, and OP unit and preferred partnership unit redemptions during the year totaled $373.6 million (plus an additional $20.7 million, which settled in January 2019) and $9.9 million, respectively.
Net cash used in financing activities also includes $260.8$275.3 million of dividend and distribution payments to equity holders, as further detailed in the table below.
Equity and Partners’ Capital Transactions
The following table presents our dividend andthe Aimco Operating Partnership’s distribution activity which is included in our net cash used in financing activities(including distributions paid to Aimco) during the year ended December 31, 20172018 (dollars in thousands):
 2017
Cash distributions paid by the Aimco Operating Partnership to holders of noncontrolling interests in consolidated real estate partnerships$8,367
Cash distributions paid by the Aimco Operating Partnership to preferred unitholders (1)16,358
Cash distributions paid by the Aimco Operating Partnership to common unitholders (2)236,044
Total cash distributions paid by the Aimco Operating Partnership$260,769
  
Cash distributions paid by Aimco to holders of noncontrolling interests in consolidated real estate partnerships$8,367
Cash distributions paid by Aimco to holders of OP Units18,431
Cash dividends paid by Aimco to preferred stockholders8,594
Cash dividends paid by Aimco to common stockholders225,377
Total cash dividends and distributions paid by Aimco$260,769
  
Cash distributions paid to holders of noncontrolling interests in consolidated real estate partnerships$9,469
Cash distributions paid by the Aimco Operating Partnership to preferred unitholders (1)16,334
Cash distributions paid by the Aimco Operating Partnership to common unitholders (2)249,491
Total cash distributions paid by the Aimco Operating Partnership$275,294
(1)$8.6 million represented distributions to Aimco, and $7.8$7.7 million represented distributions paid to holders of OP Units.
(2)$225.4237.5 million represented distributions to Aimco, and $10.6$11.9 million represented distributions paid to holders of OP Units.

The following table presents Aimco’s dividend activity during the year ended December 31, 2018 (dollars in thousands):

Cash distributions paid to holders of noncontrolling interests in consolidated real estate partnerships$9,469
Cash distributions paid to holders of OP Units (other than Aimco)19,727
Cash dividends paid by Aimco to preferred stockholders8,594
Cash dividends paid by Aimco to common stockholders237,504
Total cash dividends and distributions paid by Aimco$275,294
During the year ended December 31, 2018, we repurchased 8.2 million shares of common stock and initiated trades that settled in the month ended January 31, 2019, for an additional 0.5 million shares, all for $394.1 million, approximately a 20% discount to Aimco’s estimated NAV at the time of repurchase. The unsettled shares are included in Class A Common Stock outstanding at December 31, 2018.

Contractual Obligations
This table summarizes information contained elsewhere in this Annual Report on Form 10-K regarding payments due under contractual obligations and commitments as of December 31, 20172018 (in thousands):
TotalLess than One Year1-3 Years3-5 YearsMore than Five YearsTotalLess than One Year1-3 Years3-5 YearsMore than Five Years
Non-recourse property debt - Real Estate (1)$3,563,041
$248,540
$915,257
$1,064,282
$1,334,962
$3,937,000
$246,345
$839,556
$741,941
$2,109,158
Revolving credit facility borrowings (2)67,160


67,160

160,360


160,360

Term loan (3)250,000
250,000



Interest related to long-term debt - Real Estate (4)785,945
163,403
251,541
131,621
239,380
Interest related to long-term debt - Real Estate (3)1,066,558
167,382
290,105
205,471
403,600
Office space lease obligations5,676
2,203
2,013
1,460

22,874
2,237
5,540
4,453
10,644
Ground lease obligations (5)86,409
1,179
2,793
3,100
79,337
Construction obligations (6)91,125
78,232
12,893


Ground lease obligations (4)434,056
2,114
4,789
4,984
422,169
Construction obligations (5)206,957
164,549
42,408


Total$4,849,356
$743,557
$1,184,497
$1,267,623
$1,653,679
$5,827,805
$582,627
$1,182,398
$1,117,209
$2,945,571
  
(1)Includes scheduled principal amortization and maturity payments related to our non-recourse property debt secured by communities in our Real Estate portfolio.
(2)Includes outstanding borrowings on our revolving credit facility assuming repayment at the contractual maturity date. Our revolving credit facility is subject to an annual commitment fee (0.25% of aggregate commitments), which is not included in the amounts above.
(3)Represents the term loan that matures on June 30, 2018 and has a one-year extension option.
(4)
Includes interest related to both fixed-rate and variable-rate non-recourse property debt, and our variable-rate revolving credit facility borrowings, and our variable-rate term loan.borrowings. Interest related to variable-rate debt is estimated based on the rate effective at December 31, 2017.2018. Refer to Note 4 to the consolidated financial statements in Item 8 for a description of average interest rates associated with our debt.
(5)(4)These ground leases expire in years ranging from 20632070 to 2087.2117.
(6)(5)
Represents estimated obligations pursuant to construction contracts related to our redevelopment, development and other capital spending. Refer to Note 5 to the consolidated financial statements in Item 8 for additional information regarding these obligations.
In addition to the amounts presented in the table above, at December 31, 2017,2018, we had $125.0 million (liquidation value) of Aimco’s perpetual preferred stock outstanding with an annual dividend yield of 6.9%, which we expect to, but are not obligated to, redeem during 2019, and $101.5$101.3 million (liquidation value) of redeemable preferred OP Units of the Aimco Operating Partnership outstanding with annual distribution yields ranging from 1.92% to 8.8%. The dividends and distributions that accrue on the perpetual preferred stock and redeemable preferred OP Units are cumulative and are paid quarterly.
At December 31, 2017, communities owned by partnerships served by our Asset Management business were encumbered by $231.4 million of non-recourse property debt, $43.3 million of which matures in the next five years. The partnerships’ future obligation for interest related to this debt is $124.6 million, $52.3 million of which will be incurred over the next five years. The non-recourse property debt obligations of these partnerships have limited effect on the amount of fees and other payments we expect to receive.
Additionally, we may enter into commitments to purchase goods and services in connection with the operations of our apartment communities. Those commitments generally have terms of one year or less and reflect expenditure levels comparable to our historical expenditures.
Future Capital Needs
In addition to the items set forth in “Contractual Obligations” above, we expect to fund any future acquisitions, redevelopment, development and other capital spending principally with proceeds from apartment community sales, short-term borrowings, debt and equity financing and operating cash flows. Our near-term business plan does not contemplate the issuance of equity.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk
Our chief market risks are refunding risk, that is the availability of property debt or other cash sources to refund maturing property debt, and re-pricing risk, that is the possibility of increases in base interest rates and credit risk spreads. We use predominantly long-dated, fixed-rate, amortizing, non-recourse property debt in order to avoid the refunding and repricing risks of short-term borrowings. We use short-term debt financing and working capital primarily to fund short-term uses and generally expect to refinance such borrowings with cash from operating activities, proceeds from apartment community sales, long-term debt or equity financings. We make limited use of derivative financial instruments and we do not use them for trading or other speculative purposes.
Market Risk Associated with Loans Secured by Our Real Estate Portfolio
As of December 31, 2017,2018, on a consolidated basis, we had approximately $82.7$260.1 million of variable-rate property-level debt outstanding and $317.2$160.4 million of variable-rate borrowings under our Credit Agreement, including a $250.0 million term loan that matures on June 30, 2018.revolving credit facility. We estimate that a change in 30-day LIBOR of 100 basis points with constant credit risk spreads would reduce or increase net income attributable to Aimco common stockholders and the Aimco Operating Partnership’s common unitholders by approximately $3.8$4.2 million on an annual basis.
At December 31, 2017, our Real Estate segment2018, we had approximately $95.3$72.6 million in cash and cash equivalents and restricted cash, a portion of which bears interest at variable rates, which may offset somewhat a change in rates on our variable-rate debt discussed above.

We estimate the fair value of debt instruments as described in Note 11 to the consolidated financial statements in Item 8. The estimated fair value of total indebtedness associated with the Real Estate portfolio was approximately $3.9$4.1 billion at December 31, 2017,2018, inclusive of a $55.1$43.8 million mark-to-market liability. The mark-to-market liability decreased by $9.8 million as compared to the mark-to-market liability at December 31, 2016.2017 was $92.1 million.
If market rates for consolidated fixed-rate debt in our Real Estate segment were higher by 100 basis points with constant credit risk spreads, the estimated fair value of consolidated debt discussed above would decrease from $3.9$4.1 billion in the aggregate to $3.8$4.0 billion. If market rates for consolidated debt discussed above were lower by 100 basis points with constant credit risk spreads, the estimated fair value of consolidated fixed-rate debt would increase from $3.9$4.1 billion in the aggregate to $4.0$4.2 billion.
Market Risk Associated with Our Asset Management Business
The carrying value of non-recourse property debt of the partnerships served by our Asset Management business of $227.1 million and $236.4 million approximated its estimated fair value at December 31, 2017 and 2016, respectively. All of the non-recourse property debt of these partnership is fixed-rate debt. We do not believe this indebtedness represents a market risk for Aimco because increases or decreases in the fair value of the indebtedness are not expected to have a significant effect on the fees we expect to collect from these consolidated partnerships.
Item 8. Financial Statements and Supplementary Data
The independent registered public accounting firm’s reports, consolidated financial statements and schedule listed in the “Index to Financial Statements” on page F-1 of this Annual Report are filed as part of this report and incorporated herein by this reference.
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
None.

Item 9A. Controls and Procedures
Aimco
Disclosure Controls and Procedures
Aimco’s management, with the participation of Aimco’s chief executive officer and chief financial officer, has evaluated the effectiveness of its disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act), as of the end of the period covered by this report. Based on such evaluation, Aimco’s chief executive officer and chief financial officer have concluded that, as of the end of such period, Aimco’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Aimco’s management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of Aimco’s internal control over financial reporting as of December 31, 2017.2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2017,2018, Aimco’s internal control over financial reporting is effective.
Aimco’s independent registered public accounting firm has issued an attestation report on Aimco’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in Aimco’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 20172018 that has materially affected, or is reasonably likely to materially affect, Aimco’s internal control over financial reporting.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMReport of Independent Registered Public Accounting Firm

TheTo the Shareholders and the Board of Directors and Stockholders of
Apartment Investment and Management Company
Opinion on Internal Control over Financial Reporting
 
We have audited Apartment Investment and Management Company’s internal control over financial reporting as of December 31, 2017,2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework)“2013 framework,” (the COSO criteria). In our opinion, Apartment Investment and Management Company (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017,2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 20172018 and 2016,2017, and the related consolidated statements of operations, comprehensive income, equity and cash flows for each of the three years in the period ended December 31, 20172018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Company and our report dated February 28, 201819, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
 
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting
 
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
 
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 28, 201819, 2019


The Aimco Operating Partnership
Disclosure Controls and Procedures
The Aimco Operating Partnership’s management, with the participation of the chief executive officer and chief financial officer of Aimco, who are the equivalent of the Aimco Operating Partnership’s chief executive officer and chief financial officer, respectively, has evaluated the effectiveness of the Aimco Operating Partnership’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this report. Based on such evaluation, the chief executive officer and chief financial officer of Aimco have concluded that, as of the end of such period, the Aimco Operating Partnership’s disclosure controls and procedures are effective.
Management’s Report on Internal Control Over Financial Reporting
Management of the Aimco Operating Partnership is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and 15d-15(f) under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our Board of Directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risks that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Management assessed the effectiveness of the Aimco Operating Partnership’s internal control over financial reporting as of December 31, 2017.2018. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 Framework).
Based on their assessment, management concluded that, as of December 31, 2017,2018, the Aimco Operating Partnership’s internal control over financial reporting is effective.
The Aimco Operating Partnership’s independent registered public accounting firm has issued an attestation report on the Aimco Operating Partnership’s internal control over financial reporting.
Changes in Internal Control Over Financial Reporting
There has been no change in the Aimco Operating Partnership’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fourth quarter of 20172018 that has materially affected, or is reasonably likely to materially affect, the Aimco Operating Partnership’s internal control over financial reporting.

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRMReport of Independent Registered Public Accounting Firm

TheTo the Partners and the Board of Directors of
AIMCO Properties, L.P.
Opinion on Internal Control over Financial Reporting
 
We have audited AIMCO Properties, L.P.’s internal control over financial reporting as of December 31, 2017,2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework)“2013 framework,” (the COSO criteria). In our opinion, AIMCO Properties, L.P. (the Partnership) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017,2018, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Partnership as of December 31, 20172018 and 2016,2017, and the related consolidated statements of operations, comprehensive income, partners’ capital and cash flows for each of the three years in the period ended December 31, 20172018 and the related notes and financial statement schedule listed in the accompanying Index to Financial Statements of the Partnership and our report dated February 28, 201819, 2019 expressed an unqualified opinion thereon.

Basis for Opinion

The Partnership’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Partnership’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
 
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
 
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
 
/s/ ERNST & YOUNG LLP

Denver, Colorado
February 28, 201819, 2019

Item 9B. Other Information
None.
PART III

Item 10. Directors, Executive Officers and Corporate Governance
Each member of the board of directors of Aimco also is a director of the general partner of the Aimco Operating Partnership. The officers of Aimco are also the officers of the general partner of the Aimco Operating Partnership and hold the same titles. The information required by this item for both Aimco and the Aimco Operating Partnership is presented jointly under the captions “Board of Directors and Executive Officers,” “Corporate Governance Matters - Code of Ethics,” “Other Matters - Section 16(a) Beneficial Ownership Reporting Compliance,” “Corporate Governance Matters - Meetings and Committees: Nominating and Corporate Governance Committee,” “Corporate Governance Matters - Meetings and Committees: Audit Committee” and “Corporate Governance Matters - Meetings and Committees: Audit Committee Financial Expert” in the proxy statement for Aimco’s 20182019 annual meeting of stockholders and is incorporated herein by reference.
Item 11. Executive Compensation
The information required by this item is presented under the captions “Compensation Discussion & Analysis,” “Compensation and Human Resources Committee Report to Stockholders,” “Summary Compensation Table,” “Grants of Plan-Based Awards in 2017,2018,” “Outstanding Equity Awards at Fiscal Year-End 2017,2018,” “Option Exercises and Stock Vested in 2017,2018,” “Potential Payments Upon Termination or Change in Control” and “Corporate Governance Matters - Director Compensation” in the proxy statement for Aimco’s 20182019 annual meeting of stockholders and is incorporated herein by reference.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this item, for both Aimco and the Aimco Operating Partnership, is presented under the captions “Security Ownership of Certain Beneficial Owners and Management” and “Securities Authorized for Issuance Under Equity Compensation Plans” in the proxy statement for Aimco’s 20182019 annual meeting of stockholders and is incorporated herein by reference. In addition, as of February 27, 2018,15, 2019, Aimco, through its consolidated subsidiaries, held 95.4%93.9% of the Aimco Operating Partnership’s common partnership units outstanding.
Item 13. Certain Relationships and Related Transactions, and Director Independence
The information required by this item is presented under the caption “Certain Relationships and Related Transactions” and “Corporate Governance Matters - Independence of Directors” in the proxy statement for Aimco’s 20182019 annual meeting of stockholders and is incorporated herein by reference.
Item 14. Principal Accountant Fees and Services
The information required by this item is presented under the caption “Principal Accountant Fees and Services” in the proxy statement for Aimco’s 20182019 annual meeting of stockholders and is incorporated herein by reference.
PART IV
Item 15.Exhibits and Financial Statement Schedules
(a)(1)The financial statements listed in the Index to Financial Statements on Page F-1 of this report are filed as part of this report and incorporated herein by reference.
(a)(2)The financial statement schedule listed in the Index to Financial Statements on Page F-1 of this report is filed as part of this report and incorporated herein by reference.
(a)(3)The Exhibit Index is incorporated herein by reference.

INDEX TO EXHIBITS (1) (2)
EXHIBIT NO.DESCRIPTION
Charter (Exhibit 3.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2015,March 31, 2018, is incorporated herein by this reference)
Amended and Restated Bylaws (Exhibit 3.1 to Aimco’s Current Report on Form 8-K dated January 26, 2016, is incorporated herein by this reference)
Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 29, 1994, as amended and restated as of February 28, 2007 (Exhibit 10.1 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2006, is incorporated herein by this reference)
First Amendment to Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2007 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2007, is incorporated herein by this reference)
Second Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 30, 2009 (Exhibit 10.1 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by this reference)
Third Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of September 2, 2010 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated September 3, 2010, is incorporated herein by this reference)
Fourth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of July 26, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated July 26, 2011, is incorporated herein by this reference)
Fifth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of August 24, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated August 24, 2011, is incorporated herein by this reference)
Sixth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of December 31, 2011 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 31, 2011, is incorporated herein by this reference)
Seventh Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of May 13, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated May 15,9, 2014, is incorporated herein by this reference)
Eighth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of October 31, 2014 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated November 4, 2014, is incorporated herein by this reference)
Ninth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of August 16, 2016 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated August 16, 2016, is incorporated herein by this reference)
Tenth Amendment to the Fourth Amended and Restated Agreement of Limited Partnership of the Aimco Operating Partnership, dated as of January 31, 2017 (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)
Second Amended and Restated Senior Secured Credit Agreement, dated as of June 30, 2017, among Aimco, the Aimco Operating Partnership, AIMCO/Bethesda Holdings, Inc., the lenders party thereto, KeyBank N.A., as administrative agent, swing line lender and a letter of credit issuer (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated June 30, 2017, is incorporated herein by this reference)
Master Indemnification Agreement, dated December 3, 2001, by and among Aimco, the Aimco Operating Partnership., XYZ Holdings LLC, and the other parties signatory thereto (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
Tax Indemnification and Contest Agreement, dated December 3, 2001, by and among Aimco, National Partnership Investments, Corp., and XYZ Holdings LLC and the other parties signatory thereto (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated December 6, 2001, is incorporated herein by this reference)
Employment Contract executed on December 21, 2017, by and between the Aimco Operating Partnership and Terry Considine (Exhibit 10.1 to Aimco’s Current Report on Form 8-K, dated December 21, 2017, is incorporated herein by this reference)*
Aimco Severance Policy (Exhibit 10.1 to Aimco’s Current Report on Form 8-K dated February 22, 2018, is incorporated herein by reference)*
2007 Stock Award and Incentive Plan (Appendix A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007 is incorporated herein by this reference)*
Form of Restricted Stock Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*

Form of Non-Qualified Stock Option Agreement (2007 Stock Award and Incentive Plan) (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated April 30, 2007, is incorporated herein by this reference)*

2007 Employee Stock Purchase Plan (Appendix B to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 20, 2007, is incorporated herein by this reference)*
Apartment Investment and Management CompanyAimco 2015 Stock Award and Incentive Plan (as amended and restated January 31, 2017) (Exhibit 10.2 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Aimco Second Amended and Restated 2015 Stock Award and Incentive Plan (as amended and restated effective February 22, 2018) (Exhibit A to Aimco’s Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 8, 2018, is incorporated herein by reference)*
Form of Performance Restricted Stock Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.24 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of Restricted Stock Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.25 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of Non-Qualified Stock Option Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.26 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2015, is incorporated herein by this reference)*
Form of LTIP Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.3 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Form of Performance Vesting LTIP Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.4 to Aimco’s Current Report on Form 8-K, dated January 31, 2017, is incorporated herein by this reference)*
Form of Non-Qualified Stock Option Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.26 to Aimco’s Annual Report on Form 10-K for the year ended December 31, 2016, is incorporated herein by this reference)*
Form of Performance Vesting LTIP II Unit Agreement (2015 Stock Award and Incentive Plan) (Exhibit 10.15 to Aimco’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2018, is incorporated herein by this reference)*
List of Subsidiaries
Consent of Independent Registered Public Accounting Firm - Aimco
Consent of Independent Registered Public Accounting Firm - Aimco Operating Partnership
Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a)/15d-14(a), as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 - Aimco Operating Partnership
Agreement regarding disclosure of long-term debt instruments - Aimco
Agreement regarding disclosure of long-term debt instruments - Aimco Operating Partnership
101XBRL (Extensible Business Reporting Language). The following materials from Aimco’s and the Aimco Operating Partnership’s combined Annual Report on Form 10-K for the year ended December 31, 2017,2018, formatted in XBRL: (i) consolidated balance sheets; (ii) consolidated statements of operations; (iii) consolidated statements of comprehensive income; (iv) consolidated statements of equity and consolidated statements of partners’ capital; (v) consolidated statements of cash flows; (vi) notes to the consolidated financial statements; and (vii) financial statement schedule (3)
(1)Schedule and supplemental materials to the exhibits have been omitted but will be provided to the Securities and Exchange Commission upon request.
(2)The Commission file numbers for exhibits is 001-13232 (Aimco) and 0-24497 (the Aimco Operating Partnership), and all such exhibits remain available pursuant to the Records Control Schedule of the Securities and Exchange Commission.
(3)As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.

of the Securities Act of 1933 and Section 18 of the Securities Exchange Act of 1934.
*Management contract or compensatory plan or arrangement
Item 16. Form 10-K Summary
None.

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

APARTMENT INVESTMENT AND
MANAGEMENT COMPANY
  
By:/s/ TERRY CONSIDINE    
 Terry Considine
 Chairman of the Board and
Chief Executive Officer
Date:February 28, 201819, 2019
AIMCO PROPERTIES, L.P.
  
By:AIMCO-GP, Inc., its General Partner
  
By:/s/ TERRY CONSIDINE    
 Terry Considine
 Chairman of the Board and
Chief Executive Officer
Date:February 28, 201819, 2019

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of each registrant and in the capacities and on the dates indicated.

Signature TitleDate
APARTMENT INVESTMENT AND MANAGEMENT COMPANY 
    
AIMCO PROPERTIES, L.P. 
By: AIMCO-GP, Inc., its General Partner  
    
/s/ TERRY CONSIDINE Chairman of the Board andFebruary 28, 201819, 2019
Terry Considine 
Chief Executive Officer
(principal executive officer)
 
    
/s/ PAUL BELDIN Executive Vice President andFebruary 28, 201819, 2019
Paul Beldin 
Chief Financial Officer
(principal financial officer)
 
    
/s/ ANDREW HIGDONSenior Vice President andFebruary 28, 2018
Andrew Higdon
Chief Accounting Officer
(principal accounting officer)
/s/ THOMAS L. KELTNER DirectorFebruary 28, 201819, 2019
Thomas L. Keltner   
    
/s/ J. LANDIS MARTIN DirectorFebruary 28, 201819, 2019
J. Landis Martin   
    
/s/ ROBERT A. MILLER DirectorFebruary 28, 201819, 2019
Robert A. Miller   
    
/s/ KATHLEEN M. NELSON DirectorFebruary 28, 201819, 2019
Kathleen M. Nelson
/s/ ANN SPERLINGDirectorFebruary 19, 2019
Ann Sperling   
    
/s/ MICHAEL A. STEIN DirectorFebruary 28, 201819, 2019
Michael A. Stein   
    
/s/ NINA A. TRAN DirectorFebruary 28, 201819, 2019
Nina A. Tran   


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.


INDEX TO FINANCIAL STATEMENTS

 Page
Financial Statements: 
 
  
 
  
  
Financial Statement Schedule: 
  
All other schedules are omitted because they are not applicable or the required information is shown in the financial statements or notes thereto. 


Report of Independent Registered Public Accounting Firm


The Shareholders and the Board of Directors and Stockholders of
Apartment Investment and Management Company

Opinion on the Financial Statements
 
We have audited the accompanying consolidated balance sheets of Apartment Investment and Management Company (the Company) as of December 31, 20172018 and 2016,2017, the related consolidated statements of operations, comprehensive income, equity, and cash flows for each of the three years in the period ended December 31, 2017,2018, and the related notes and the financial statement schedule listed in the accompanying Index to Financial Statements (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 20172018 and 2016,2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017,2018, in conformity with U.S. generally accepted accounting principles.
 
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company'sCompany’s internal control over financial reporting as of December 31, 2017,2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 28, 201819, 2019 expressed an unqualified opinion thereon.
 
Adoption of New Accounting Standard
 
As discussed in Note 29 to the consolidated financial statements, the Company changed its accounting for the income tax consequences of intercompany transfers of assets effective January 1, 2017.

Basis for Opinion
 
These financial statements are the responsibility of the Company'sCompany’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
 
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ ERNST & YOUNG LLP

We have served as the Company’s auditor since 1994.
 
Denver, Colorado
February 28, 201819, 2019


APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED BALANCE SHEETS
As of December 31, 20172018 and 20162017
(In thousands, except share data)

2017 20162018 2017
ASSETS      
Buildings and improvements$6,174,149
 $6,106,298
$6,552,065
 $6,174,149
Land1,753,604
 1,824,819
1,756,525
 1,753,604
Total real estate7,927,753
 7,931,117
8,308,590
 7,927,753
Accumulated depreciation(2,522,358) (2,421,357)(2,585,115) (2,522,358)
Net real estate5,405,395
 5,509,760
5,723,475
 5,405,395
Cash and cash equivalents60,498
 45,821
36,858
 60,498
Restricted cash34,827
 36,405
35,737
 34,827
Other assets272,739
 293,768
351,541
 272,739
Assets held for sale17,959
 
42,393
 17,959
Assets of partnerships served by Asset Management business:      
Real estate, net224,873
 245,648

 224,873
Cash and cash equivalents16,288
 15,423

 16,288
Restricted cash30,928
 33,501

 30,928
Other assets15,533
 52,492

 15,533
Total assets$6,079,040
 $6,232,818
$6,190,004
 $6,079,040
      
LIABILITIES AND EQUITY      
Non-recourse property debt secured by Real Estate communities, net$3,545,109
 $3,630,276
$3,915,305
 $3,545,109
Term loan, net249,501
 

 249,501
Revolving credit facility borrowings67,160
 17,930
160,360
 67,160
Total indebtedness associated with Real Estate portfolio3,861,770
 3,648,206
4,075,665
 3,861,770
Accrued liabilities and other200,540
 218,937
226,230
 213,027
Liabilities related to assets held for sale23,177
 
Liabilities of partnerships served by Asset Management business:      
Non-recourse property debt, net227,141
 236,426

 227,141
Accrued liabilities and other19,812
 62,630

 19,812
Deferred income12,487
 18,452
Total liabilities4,321,750
 4,184,651
4,325,072
 4,321,750
Preferred noncontrolling interests in Aimco Operating Partnership (Note 7)101,537
 103,201
101,291
 101,537
Commitments and contingencies (Note 5)
 

 
Equity:      
Perpetual Preferred Stock (Note 6)125,000
 125,000
125,000
 125,000
Common Stock, $0.01 par value, 500,787,260 shares authorized, 157,189,447 and 156,888,381 shares issued/outstanding at December 31, 2017 and 2016, respectively1,572
 1,569
Common Stock, $0.01 par value, 500,787,260 shares authorized, 149,133,826 and 157,189,447 shares issued/outstanding at December 31, 2018 and 2017, respectively1,491
 1,572
Additional paid-in capital3,900,042
 4,051,722
3,515,641
 3,900,042
Accumulated other comprehensive income3,603
 1,011
4,794
 3,603
Distributions in excess of earnings(2,367,073) (2,385,399)(1,947,507) (2,367,073)
Total Aimco equity1,663,144
 1,793,903
1,699,419
 1,663,144
Noncontrolling interests in consolidated real estate partnerships(1,716) 151,121
(2,967) (1,716)
Common noncontrolling interests in Aimco Operating Partnership(5,675) (58)67,189
 (5,675)
Total equity1,655,753
 1,944,966
1,763,641
 1,655,753
Total liabilities and equity$6,079,040
 $6,232,818
$6,190,004
 $6,079,040



See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF OPERATIONS
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands, except per share data)

2017 2016 20152018 2017 2016
REVENUES:          
Rental and other property revenues attributable to Real Estate$918,148
 $899,891
 $883,020
$922,593
 $918,148
 $899,891
Rental and other property revenues of partnerships served by Asset Management business74,046
 74,640
 73,934
42,830
 74,046
 74,640
Tax credit and transaction revenues13,243
 21,323
 24,356
6,987
 13,243
 21,323
Total revenues1,005,437
 995,854
 981,310
972,410
 1,005,437
 995,854
OPERATING EXPENSES:          
Property operating expenses attributable to Real Estate318,939
 317,957
 324,579
307,901
 319,126
 317,957
Property operating expenses of partnerships served by Asset Management business35,440
 36,956
 37,537
20,921
 35,458
 36,956
Depreciation and amortization366,184
 333,066
 306,301
377,786
 366,184
 333,066
General and administrative expenses43,657
 46,784
 46,310
46,268
 43,657
 46,784
Other expenses, net11,353
 14,295
 10,368
3,778
 11,148
 14,295
Provision for real estate impairment loss (Note 3)35,881
 
 
Provision for real estate impairment loss
 35,881
 
Total operating expenses811,454
 749,058
 725,095
756,654
 811,454
 749,058
Operating income193,983
 246,796
 256,215
     
Interest income8,332
 7,797
 6,949
10,914
 8,332
 7,797
Interest expense(194,615) (196,389) (199,685)(200,634) (194,615) (196,389)
Gain on dispositions of real estate and the Asset Management Business677,463
 300,849
 400,156
Other, net7,694
 6,071
 387
77
 7,694
 6,071
Income before income taxes and gain on dispositions15,394
 64,275
 63,866
Income before income tax benefit703,576
 316,243
 464,431
Income tax benefit (Note 9)32,126
 25,208
 27,524
13,027
 30,836
 18,842
Income before gain on dispositions47,520
 89,483
 91,390
Gain on dispositions of real estate, net of tax299,559
 393,790
 180,593
Net income347,079
 483,273
 271,983
716,603
 347,079
 483,273
Noncontrolling interests:          
Net income attributable to noncontrolling interests in consolidated real estate partnerships(9,084) (25,256) (4,776)(8,220) (9,084) (25,256)
Net income attributable to preferred noncontrolling interests in Aimco Operating Partnership(7,764) (7,239) (6,943)(7,739) (7,764) (7,239)
Net income attributable to common noncontrolling interests in Aimco Operating Partnership(14,457) (20,368) (11,554)(34,417) (14,457) (20,368)
Net income attributable to noncontrolling interests(31,305) (52,863) (23,273)(50,376) (31,305) (52,863)
Net income attributable to Aimco315,774
 430,410
 248,710
666,227
 315,774
 430,410
Net income attributable to Aimco preferred stockholders(8,594) (11,994) (11,794)(8,593) (8,594) (11,994)
Net income attributable to participating securities(319) (635) (950)(1,037) (319) (635)
Net income attributable to Aimco common stockholders$306,861
 $417,781
 $235,966
$656,597
 $306,861
 $417,781
          
Net income attributable to Aimco per common share – basic$1.96
 $2.68
 $1.52
$4.21
 $1.96
 $2.68
Net income attributable to Aimco per common share – diluted$1.96
 $2.67
 $1.52
$4.21
 $1.96
 $2.67
          
Weighted average common shares outstanding – basic156,323
 156,001
 155,177
155,866
 156,323
 156,001
Weighted average common shares outstanding – diluted156,796
 156,391
 155,570
156,053
 156,796
 156,391






See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)

 2017 2016 2015
Net income$347,079
 $483,273
 $271,983
Other comprehensive income:     
Unrealized (losses) gains on interest rate swaps(173) 221
 (1,299)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income1,480
 1,586
 1,678
Unrealized gains on debt securities classified as available-for-sale1,507
 5,855
 214
Other comprehensive income2,814
 7,662
 593
Comprehensive income349,893
 490,935
 272,576
Comprehensive income attributable to noncontrolling interests(31,527) (53,474) (23,450)
Comprehensive income attributable to Aimco$318,366
 $437,461
 $249,126
 2018 2017 2016
Net income$716,603
 $347,079
 $483,273
Other comprehensive gain:     
Realized and unrealized (losses) gains on interest rate swaps
 (173) 221
Losses on interest rate swaps reclassified into earnings from accumulated other comprehensive loss1,391
 1,480
 1,586
Unrealized (losses) gains on available for sale debt securities(131) 1,507
 5,855
Other comprehensive gain1,260
 2,814
 7,662
Comprehensive income717,863
 349,893
 490,935
Comprehensive income attributable to noncontrolling interests(50,445) (31,527) (53,474)
Comprehensive income attributable to Aimco$667,418
 $318,366
 $437,461






































See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF EQUITY
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)
Preferred Stock Common Stock            Preferred Stock Common Stock            
Shares Issued Amount Shares Issued Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Distributions in Excess of Earnings Total Aimco Equity Noncontrolling Interests Total EquityShares Issued Amount Shares Issued Amount Additional Paid-in Capital Accumulated Other Comprehensive Income (Loss) Distributions in Excess of Earnings Total Aimco Equity Noncontrolling Interests Total Equity
Balances at December 31, 20146,391
 $186,126
 146,403
 $1,464
 $3,696,143
 $(6,456) $(2,649,542) $1,227,735
 $214,370
 $1,442,105
Issuance of Common Stock
 
 9,430
 94
 366,486
 
 
 366,580
 
 366,580
Repurchase of Preferred Stock
 (27,000) 
 
 695
 
 (695) (27,000) 
 (27,000)
Redemption of Aimco Operating Partnership units
 
 
 
 
 
 
 
 (4,181) (4,181)
Amortization of share-based compensation cost
 
 27
 
 7,096
 
 
 7,096
 
 7,096
Effect of changes in ownership for consolidated entities
 
 
 
 (6,008) 
 
 (6,008) 4,189
 (1,819)
Change in accumulated other comprehensive income
 
 
 
 
 416
 
 416
 177
 593
Other, net
 
 466
 5
 247
 
 100
 352
 
 352
Net income
 
 
 
 
 
 248,710
 248,710
 16,330
 265,040
Distributions to noncontrolling interests
 
 
 
 
 
 
 
 (89,371) (89,371)
Common Stock dividends
 
 
 
 
 
 (184,391) (184,391) 
 (184,391)
Preferred Stock dividends
 
 
 
 
 
 (11,099) (11,099) 
 (11,099)
Balances at December 31, 20156,391
 159,126
 156,326
 1,563
 4,064,659
 (6,040) (2,596,917) 1,622,391
 141,514
 1,763,905
6,391
 $159,126
 156,326
 $1,563
 $4,064,659
 $(6,040) $(2,596,917) $1,622,391
 $141,514
 $1,763,905
Redemption of Preferred Stock(1,391) (34,126) 
 
 1,307
 
 (1,980) (34,799) 
 (34,799)(1,391) (34,126) 
 
 1,307
 
 (1,980) (34,799) 
 (34,799)
Redemption of Aimco Operating Partnership units
 
 
 
 
 
 
 
 (10,819) (10,819)
 
 
 
 
 
 
 
 (10,819) (10,819)
Amortization of share-based compensation cost
 
 31
 
 8,610
 
 
 8,610
 
 8,610

 
 31
 
 8,610
 
 
 8,610
 
 8,610
Effect of changes in ownership for consolidated entities
 
 
 
 (26,171) 
 
 (26,171) 10,107
 (16,064)
 
 
 
 (26,171) 
 
 (26,171) 10,107
 (16,064)
Change in accumulated other comprehensive income
 
 
 
 
 7,051
 
 7,051
 611
 7,662

 
 
 
 
 7,051
 
 7,051
 611
 7,662
Other, net
 
 531
 6
 3,317
 
 
 3,323
 
 3,323

 
 531
 6
 3,317
 
 
 3,323
 
 3,323
Net income
 
 
 
 
 
 430,410
 430,410
 45,624
 476,034

 
 
 
 
 
 430,410
 430,410
 45,624
 476,034
Distributions to noncontrolling interests
 
 
 
 
 
 
 
 (35,974) (35,974)
 
 
 
 
 
 
 
 (35,974) (35,974)
Common Stock dividends
 
 
 
 
 
 (206,898) (206,898) 
 (206,898)
 
 
 
 
 
 (206,898) (206,898) 
 (206,898)
Preferred Stock dividends
 
 
 
 
 
 (10,014) (10,014) 
 (10,014)
 
 
 
 
 
 (10,014) (10,014) 
 (10,014)
Balances at December 31, 20165,000
 125,000
 156,888
 1,569
 4,051,722
 1,011
 (2,385,399) 1,793,903
 151,063
 1,944,966
5,000
 125,000
 156,888
 1,569
 4,051,722
 1,011
 (2,385,399) 1,793,903
 151,063
 1,944,966
Redemption of Aimco Operating Partnership units
 
 
 
 
 
 
 
 (11,882) (11,882)
 
 
 
 
 
 
 
 (11,882) (11,882)
Amortization of share-based compensation cost
 
 18
 
 8,638
 
 
 8,638
 613
 9,251

 
 18
 
 8,638
 
 
 8,638
 613
 9,251
Contributions from noncontrolling interests
 
 
 
 
 
 
 
 3,401
 3,401

 
 
 
 
 
 
 
 3,401
 3,401
Effect of changes in ownership for consolidated entities
 
 
 
 (160,586) 
 
 (160,586) (152,189) (312,775)
 
 
 
 (160,586) 
 
 (160,586) (152,189) (312,775)
Cumulative effect of a change in accounting principle
 
 
 
 
 
 (62,682) (62,682) (3,028) (65,710)
 
 
 
 
 
 (62,682) (62,682) (3,028) (65,710)
Change in accumulated other comprehensive income
 
 
 
 
 2,592
 
 2,592
 222
 2,814

 
 
 
 
 2,592
 
 2,592
 222
 2,814
Other, net
 
 283
 3
 268
 
 
 271
 
 271

 
 283
 3
 268
 
 
 271
 
 271
Net income
 
 
 
 
 
 315,774
 315,774
 23,541
 339,315

 
 
 
 
 
 315,774
 315,774
 23,541
 339,315
Distributions to noncontrolling interests
 
 
 
 
 
 
 
 (19,132) (19,132)
 
 
 
 
 
 
 
 (19,132) (19,132)
Common Stock dividends
 
 
 
 
 
 (226,172) (226,172) 
 (226,172)
 
 
 
 
 
 (226,172) (226,172) 
 (226,172)
Preferred Stock dividends
 
 
 
 
 
 (8,594) (8,594) 
 (8,594)
 
 
 
 
 
 (8,594) (8,594) 
 (8,594)
Balances at December 31, 20175,000
 $125,000
 157,189
 $1,572
 $3,900,042
 $3,603
 $(2,367,073) $1,663,144
 $(7,391) $1,655,753
5,000
 125,000
 157,189
 1,572
 3,900,042
 3,603
 (2,367,073) 1,663,144
 (7,391) 1,655,753
Repurchases of Common Stock
 
 (8,219) (82) (373,511) 
 
 (373,593) 
 (373,593)
Issuance of Aimco Operating Partnership units
 
 
 
 
 
 
 
 50,151
 50,151
Redemption of Aimco Operating Partnership units
 
 
 
 
 
 
 
 (9,639) (9,639)
Amortization of share-based compensation cost
 
 22
 
 8,074
 
 
 8,074
 1,691
 9,765
Effect of changes in ownership for consolidated entities
 
 
 
 (19,115) 
 
 (19,115) 9,014
 (10,101)
Change in accumulated other comprehensive income
 
 
 
 
 1,191
 
 1,191
 69
 1,260
Other, net
 
 142
 1
 151
 
 
 152
 
 152
Net income
 
 
 
 
 
 666,227
 666,227
 42,637
 708,864
Distributions to noncontrolling interests
 
 
 
 
 
 
 
 (22,310) (22,310)
Common Stock dividends
 
 
 
 
 
 (238,067) (238,067) 
 (238,067)
Preferred Stock dividends
 
 
 
 
 
 (8,594) (8,594) 
 (8,594)
Balances at December 31, 20185,000
 $125,000
 149,134
 $1,491
 $3,515,641
 $4,794
 $(1,947,507) $1,699,419
 $64,222
 $1,763,641




See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)
 2017 2016 2015
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$347,079
 $483,273
 $271,983
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization366,184
 333,066
 306,301
Gain on dispositions of real estate, net of tax(299,559) (393,790) (180,593)
Provision for real estate impairment loss35,881
 
 
Income tax benefit(32,126) (25,208) (27,524)
Share-based compensation expense7,877
 7,629
 6,640
Amortization of debt issue costs and other5,666
 5,060
 5,186
Other, net(7,694) (6,071) (387)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(13,375) (20,680) 619
Accounts payable, accrued liabilities and other(15,794) (5,555) (22,334)
Total adjustments47,060
 (105,549) 87,908
Net cash provided by operating activities394,139
 377,724
 359,891
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(20,372) (290,729) (169,447)
Capital expenditures(358,104) (346,645) (367,180)
Proceeds from dispositions of real estate402,162
 535,513
 367,571
Purchases of corporate assets(8,899) (7,540) (6,665)
Changes in restricted cash1,506
 1,374
 (429)
Other investing activities(1,589) 10,254
 5,253
Net cash provided by (used in) investing activities14,704
 (97,773) (170,897)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt312,434
 417,714
 352,602
Principal repayments on non-recourse property debt(409,167) (371,947) (514,294)
Proceeds from term loan250,000
 
 
Net borrowings (repayments) on revolving credit facility49,230
 (9,070) (85,330)
Proceeds from issuance of Common Stock
 
 366,580
Redemptions of Preferred Stock
 (34,799) (27,000)
Payment of dividends to holders of Preferred Stock(8,594) (10,014) (11,099)
Payment of dividends to holders of Common Stock(225,377) (206,279) (184,082)
Payment of distributions to noncontrolling interests(26,799) (35,706) (57,401)
Purchases and redemptions of noncontrolling interests(327,815) (26,485) (4,517)
Other financing activities(7,213) 7,090
 (2,635)
Net cash used in financing activities(393,301) (269,496) (167,176)
NET INCREASE IN CASH AND CASH EQUIVALENTS15,542
 10,455
 21,818
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD61,244
 50,789
 28,971
CASH AND CASH EQUIVALENTS AT END OF PERIOD$76,786
 $61,244
 $50,789





 2018 2017 2016
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$716,603
 $347,079
 $483,273
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization377,786
 366,184
 333,066
Provision for real estate impairment loss
 35,881
 
Gain on dispositions of real estate and the Asset Management business(677,463) (300,849) (400,156)
Income tax benefit(13,027) (30,836) (18,842)
Share-based compensation expense8,550
 7,877
 7,629
Amortization of debt issue costs and other9,023
 5,666
 5,060
Other, net1,065
 (7,694) (6,071)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(27,830) (15,841) (22,294)
Accounts payable, accrued liabilities and other1,681
 (15,395) (5,164)
Total adjustments(320,215) 44,993
 (106,772)
Net cash provided by operating activities396,388
 392,072
 376,501
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(242,297) (20,372) (290,729)
Capital expenditures(340,489) (358,104) (346,645)
Proceeds from dispositions of real estate708,848
 401,983
 535,513
Purchases of corporate assets(7,718) (8,899) (7,540)
Proceeds from repayments on notes receivable5,010
 430
 412
Other investing activities(1,508) (2,019) 9,842
Net cash provided by (used in) investing activities121,846
 13,019
 (99,147)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt1,228,027
 312,434
 417,714
Principal repayments on non-recourse property debt(976,087) (409,167) (371,947)
(Repayment of) proceeds from term loan(250,000) 250,000
 
Net borrowings on (repayments of) revolving credit facility93,200
 49,230
 (9,070)
Payment of debt issue costs(11,961) (4,751) (7,816)
Payment of debt extinguishment costs(14,241) (399) (391)
Repurchases of Common Stock(373,593) 
 
Redemptions of Preferred Stock
 
 (34,799)
Payment of dividends to holders of Preferred Stock(8,594) (8,594) (10,014)
Payment of dividends to holders of Common Stock(237,504) (225,377) (206,279)
Payment of distributions to noncontrolling interests(29,196) (26,799) (35,706)
Redemptions of noncontrolling interests in the Aimco Operating Partnership(9,885) (13,546) (12,544)
Purchases of noncontrolling interests in consolidated real estate partnerships(3,579) (314,269) (13,941)
Other financing activities5,233
 (2,462) 844
Net cash used in financing activities(588,180) (393,700) (283,949)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH(69,946) 11,391
 (6,595)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD142,541
 131,150
 137,745
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD$72,595
 $142,541
 $131,150




See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)

2017 2016 20152018 2017 2016
SUPPLEMENTAL CASH FLOW INFORMATION:          
Interest paid$196,438
 $200,278
 $207,087
$199,996
 $196,438
 $200,278
Cash paid for income taxes7,401
 2,152
 2,033
11,522
 7,401
 2,152
Non-cash transactions associated with the acquisition or disposition of real estate:          
Non-recourse property debt assumed by buyer in connection with the disposition of real estate
 
 6,068
Non-recourse property debt assumed by buyer in connection with the disposition of the Asset Management business227,708
 
 
Non-recourse property debt assumed in connection with the acquisition of real estate208,885
 
 
Issuance of preferred OP Units in connection with acquisition of real estate
 17,000
 

 
 17,000
Issuance of common OP Units in connection with acquisition of real estate50,151
 
 
Other non-cash investing and financing transactions:          
Accrued capital expenditures (at end of period)31,719
 35,594
 43,725
40,185
 31,719
 35,594
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)1,720
 927
 309
1,266
 1,720
 927




































See notes to the consolidated financial statements.

Report of Independent Registered Public Accounting Firm


The Partners and the Board of Directors
AIMCO Properties, L.P.
 
Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of AIMCO Properties, L.P. (the “Partnership”) as of December 31, 20172018 and 2016,2017, the related consolidated statements of operations, comprehensive income, partners'partners’ capital, and cash flows for each of the three years in the period ended December 31, 2017,2018, and the related notes and the financial statement schedule listed in the accompanying Index to Financial Statements (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Partnership at December 31, 20172018 and 2016,2017, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017,2018, in conformity with U.S. generally accepted accounting principles.
    
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Partnership'sPartnership’s internal control over financial reporting as of December 31, 2017,2018, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 28, 201819, 2019 expressed an unqualified opinion thereon.

Adoption of New Accounting Standard
 
As discussed in Note 29 to the consolidated financial statements, the Partnership changed its accounting for the income tax consequences of intercompany transfers of assets effective January 1, 2017.

Basis for Opinion

These financial statements are the responsibility of the Partnership'sPartnership’s management. Our responsibility is to express an opinion on the Partnership’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Partnership in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ ERNST & YOUNG LLP
We have served as the Partnership’s auditor since 1994.

Denver, Colorado
February 28, 201819, 2019





AIMCO PROPERTIES, L.P.
CONSOLIDATED BALANCE SHEETS
As of December 31, 20172018 and 20162017
(In thousands)

2017 20162018 2017
ASSETS      
Buildings and improvements$6,174,149
 $6,106,298
$6,552,065
 $6,174,149
Land1,753,604
 1,824,819
1,756,525
 1,753,604
Total real estate7,927,753
 7,931,117
8,308,590
 7,927,753
Accumulated depreciation(2,522,358) (2,421,357)(2,585,115) (2,522,358)
Net real estate5,405,395
 5,509,760
5,723,475
 5,405,395
Cash and cash equivalents60,498
 45,821
36,858
 60,498
Restricted cash34,827
 36,405
35,737
 34,827
Other assets272,739
 293,768
351,541
 272,739
Assets held for sale17,959
 
42,393
 17,959
Assets of partnerships served by Asset Management business:      
Real estate, net224,873
 245,648

 224,873
Cash and cash equivalents16,288
 15,423

 16,288
Restricted cash30,928
 33,501

 30,928
Other assets15,533
 52,492

 15,533
Total assets$6,079,040
 $6,232,818
$6,190,004
 $6,079,040
      
LIABILITIES AND PARTNERS’ CAPITAL      
Non-recourse property debt secured by Real Estate communities, net$3,545,109
 $3,630,276
$3,915,305
 $3,545,109
Term loan, net249,501
 

 249,501
Revolving credit facility borrowings67,160
 17,930
160,360
 67,160
Total indebtedness associated with Real Estate portfolio3,861,770
 3,648,206
4,075,665
 3,861,770
Accrued liabilities and other200,540
 218,937
226,230
 213,027
Liabilities related to assets held for sale23,177
 
Liabilities of partnerships served by Asset Management business:      
Non-recourse property debt, net227,141
 236,426

 227,141
Accrued liabilities and other19,812
 62,630

 19,812
Deferred income12,487
 18,452
Total liabilities4,321,750
 4,184,651
4,325,072
 4,321,750
Redeemable preferred units (Note 7)101,537
 103,201
101,291
 101,537
Commitments and contingencies (Note 5)
 

 
Partners’ Capital:      
Preferred units (Note 7)125,000
 125,000
125,000
 125,000
General Partner and Special Limited Partner1,538,144
 1,668,903
1,574,419
 1,538,144
Limited Partners(5,675) (58)67,189
 (5,675)
Partners’ capital attributable to the Aimco Operating Partnership1,657,469
 1,793,845
1,766,608
 1,657,469
Noncontrolling interests in consolidated real estate partnerships(1,716) 151,121
(2,967) (1,716)
Total partners’ capital1,655,753
 1,944,966
1,763,641
 1,655,753
Total liabilities and partners’ capital$6,079,040
 $6,232,818
$6,190,004
 $6,079,040






See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF OPERATIONS
As ofFor the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands, except per unit data)

2017 2016 20152018 2017 2016
REVENUES:          
Rental and other property revenues attributable to Real Estate$918,148
 $899,891
 $883,020
$922,593
 $918,148
 $899,891
Rental and other property revenues of partnerships served by Asset Management business74,046
 74,640
 73,934
42,830
 74,046
 74,640
Tax credit and transaction revenues13,243
 21,323
 24,356
6,987
 13,243
 21,323
Total revenues1,005,437
 995,854
 981,310
972,410
 1,005,437
 995,854
OPERATING EXPENSES:          
Property operating expenses attributable to Real Estate318,939
 317,957
 324,579
307,901
 319,126
 317,957
Property operating expenses of partnerships served by Asset Management business35,440
 36,956
 37,537
20,921
 35,458
 36,956
Depreciation and amortization366,184
 333,066
 306,301
377,786
 366,184
 333,066
General and administrative expenses43,657
 46,784
 46,310
46,268
 43,657
 46,784
Other expenses, net11,353
 14,295
 10,368
3,778
 11,148
 14,295
Provision for real estate impairment loss (Note 3)35,881
 
 
Provision for real estate impairment loss
 35,881
 
Total operating expenses811,454
 749,058
 725,095
756,654
 811,454
 749,058
Operating income193,983
 246,796
 256,215
     
Interest income8,332
 7,797
 6,949
10,914
 8,332
 7,797
Interest expense(194,615) (196,389) (199,685)(200,634) (194,615) (196,389)
Gain on dispositions of real estate and the Asset Management Business677,463
 300,849
 400,156
Other, net7,694
 6,071
 387
77
 7,694
 6,071
Income before income taxes and gain on dispositions15,394
 64,275
 63,866
Income before income tax benefit703,576
 316,243
 464,431
Income tax benefit (Note 9)32,126
 25,208
 27,524
13,027
 30,836
 18,842
Income before gain on dispositions47,520
 89,483
 91,390
Gain on dispositions of real estate, net of tax299,559
 393,790
 180,593
Net income347,079
 483,273
 271,983
716,603
 347,079
 483,273
Net income attributable to noncontrolling interests in consolidated real estate partnerships(9,084) (25,256) (4,776)(8,220) (9,084) (25,256)
Net income attributable to the Aimco Operating Partnership337,995
 458,017
 267,207
708,383
 337,995
 458,017
Net income attributable to the Aimco Operating Partnership’s preferred unitholders(16,358) (19,233) (18,737)(16,332) (16,358) (19,233)
Net income attributable to participating securities(337) (635) (950)(1,177) (337) (635)
Net income attributable to the Aimco Operating Partnership’s common unitholders$321,300
 $438,149
 $247,520
$690,874
 $321,300
 $438,149
          
Net income attributable to the Aimco Operating Partnership per common unit – basic$1.96
 $2.68
 $1.52
$4.22
 $1.96
 $2.68
Net income attributable to the Aimco Operating Partnership per common unit – diluted$1.96
 $2.67
 $1.52
$4.21
 $1.96
 $2.67
          
Weighted average common units outstanding – basic163,746
 163,761
 162,834
163,846
 163,746
 163,761
Weighted average common units outstanding – diluted164,218
 164,151
 163,227
164,033
 164,218
 164,151










See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)

 2017 2016 2015
Net income$347,079
 $483,273
 $271,983
Other comprehensive income:     
Unrealized (losses) gains on interest rate swaps(173) 221
 (1,299)
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive income1,480
 1,586
 1,678
Unrealized gains on debt securities classified as available-for-sale1,507
 5,855
 214
Other comprehensive income2,814
 7,662
 593
Comprehensive income349,893
 490,935
 272,576
Comprehensive income attributable to noncontrolling interests(9,185) (25,516) (4,932)
Comprehensive income attributable to the Aimco Operating Partnership$340,708
 $465,419
 $267,644
 2018 2017 2016
Net income$716,603
 $347,079
 $483,273
Other comprehensive gain:     
Realized and unrealized (losses) gains on interest rate swaps
 (173) 221
Losses on interest rate swaps reclassified into earnings from accumulated other comprehensive loss1,391
 1,480
 1,586
Unrealized (losses) gains on available for sale debt securities(131) 1,507
 5,855
Other comprehensive gain1,260
 2,814
 7,662
Comprehensive income717,863
 349,893
 490,935
Comprehensive income attributable to noncontrolling interests(8,220) (9,185) (25,516)
Comprehensive income attributable to the Aimco Operating Partnership$709,643
 $340,708
 $465,419






































See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF PARTNERS’ CAPITAL
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)
Preferred
Units
 
General Partner
and Special
Limited Partner
 Limited Partners Partners’ Capital Attributable to the Partnership Noncontrolling Interests Total
Partners’ Capital
Preferred
Units
 
General Partner
and Special
Limited Partner
 Limited Partners Partners’ Capital Attributable to the Partnership Noncontrolling Interests Total
Partners’ Capital
Balances at December 31, 2014$186,126
 $1,041,609
 $(18,926) $1,208,809
 $233,296
 $1,442,105
Issuance of common partnership units to Aimco
 366,580
 
 366,580
 
 366,580
Redemption of preferred units held by Aimco(27,000) 
 
 (27,000) 
 (27,000)
Redemption of partnership units held by non-Aimco partners
 
 (4,181) (4,181) 
 (4,181)
Amortization of Aimco share-based compensation
 7,096
 
 7,096
 
 7,096
Effect of changes in ownership for consolidated entities
 (6,008) 10,739
 4,731
 (6,550) (1,819)
Change in accumulated other comprehensive income
 416
 21
 437
 156
 593
Other, net
 352
 
 352
 
 352
Net income
 248,710
 11,554
 260,264
 4,776
 265,040
Distributions to noncontrolling interests
 
 
 
 (80,313) (80,313)
Distributions to common unitholders
 (184,391) (9,058) (193,449) 
 (193,449)
Distributions to preferred unitholders
 (11,099) 
 (11,099) 
 (11,099)
Balances at December 31, 2015159,126
 1,463,265
 (9,851) 1,612,540
 151,365
 1,763,905
$159,126
 $1,463,265
 $(9,851) $1,612,540
 $151,365
 $1,763,905
Redemption of preferred units held by Aimco(34,126) (673) 
 (34,799) 
 (34,799)(34,126) (673) 
 (34,799) 
 (34,799)
Redemption of partnership units held by non-Aimco partners
 
 (10,819) (10,819) 
 (10,819)
 
 (10,819) (10,819) 
 (10,819)
Amortization of Aimco share-based compensation
 8,610
 
 8,610
 
 8,610

 8,610
 
 8,610
 
 8,610
Effect of changes in ownership for consolidated entities
 (26,171) 10,107
 (16,064) 
 (16,064)
 (26,171) 10,107
 (16,064) 
 (16,064)
Change in accumulated other comprehensive income
 7,051
 351
 7,402
 260
 7,662

 7,051
 351
 7,402
 260
 7,662
Other, net
 3,323
 
 3,323
 
 3,323

 3,323
 
 3,323
 
 3,323
Net income
 430,410
 20,368
 450,778
 25,256
 476,034

 430,410
 20,368
 450,778
 25,256
 476,034
Distributions to noncontrolling interests
 
 
 
 (25,760) (25,760)
 
 
 
 (25,760) (25,760)
Distributions to common unitholders
 (206,898) (10,214) (217,112) 
 (217,112)
 (206,898) (10,214) (217,112) 
 (217,112)
Distributions to preferred unitholders
 (10,014) 
 (10,014) 
 (10,014)
 (10,014) 
 (10,014) 
 (10,014)
Balances at December 31, 2016125,000
 1,668,903
 (58) 1,793,845
 151,121
 1,944,966
125,000
 1,668,903
 (58) 1,793,845
 151,121
 1,944,966
Redemption of partnership units held by non-Aimco partners
 
 (11,882) (11,882) 
 (11,882)
 
 (11,882) (11,882) 
 (11,882)
Amortization of Aimco share-based compensation
 8,638
 613
 9,251
 
 9,251

 8,638
 613
 9,251
 
 9,251
Contributions from noncontrolling interests
 
 
 
 3,401
 3,401

 
 
 
 3,401
 3,401
Effect of changes in ownership for consolidated entities
 (160,586) 4,867
 (155,719) (157,056) (312,775)
 (160,586) 4,867
 (155,719) (157,056) (312,775)
Cumulative effect of a change in accounting principle
 (62,682) (3,028) (65,710) 
 (65,710)
 (62,682) (3,028) (65,710) 
 (65,710)
Change in accumulated other comprehensive income
 2,592
 121
 2,713
 101
 2,814

 2,592
 121
 2,713
 101
 2,814
Other, net
 271
 
 271
 
 271

 271
 
 271
 
 271
Net income
 315,774
 14,457
 330,231
 9,084
 339,315

 315,774
 14,457
 330,231
 9,084
 339,315
Distributions to noncontrolling interests
 
 
 
 (8,367) (8,367)
 
 
 
 (8,367) (8,367)
Distributions to common unitholders
 (226,172) (10,765) (236,937) 
 (236,937)
 (226,172) (10,765) (236,937) 
 (236,937)
Distributions to preferred unitholders
 (8,594) 
 (8,594) 
 (8,594)
 (8,594) 
 (8,594) 
 (8,594)
Balances at December 31, 2017$125,000
 $1,538,144
 $(5,675) $1,657,469
 $(1,716) $1,655,753
125,000
 1,538,144
 (5,675) 1,657,469
 (1,716) 1,655,753
Repurchases of common partnership units
 (373,593) 
 (373,593) 
 (373,593)
Issuance of common partnership units
 
 50,151
 50,151
 
 50,151
Redemption of partnership units held by non-Aimco partners
 
 (9,639) (9,639) 
 (9,639)
Amortization of Aimco share-based compensation
 8,074
 1,691
 9,765
 
 9,765
Effect of changes in ownership for consolidated entities
 (19,115) 9,014
 (10,101) 
 (10,101)
Change in accumulated other comprehensive income
 1,191
 69
 1,260
 
 1,260
Other, net
 152
 
 152
 
 152
Net income
 666,227
 34,417
 700,644
 8,220
 708,864
Distributions to noncontrolling interests
 
 (12,839) (12,839) (9,471) (22,310)
Distributions to common unitholders
 (238,067) 
 (238,067) 
 (238,067)
Distributions to preferred unitholders
 (8,594) 
 (8,594) 
 (8,594)
Balances at December 31, 2018$125,000
 $1,574,419
 $67,189
 $1,766,608
 $(2,967) $1,763,641





See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)
 2017 2016 2015
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$347,079
 $483,273
 $271,983
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization366,184
 333,066
 306,301
Gain on dispositions of real estate, net of tax(299,559) (393,790) (180,593)
Provision for real estate impairment loss35,881
 
 
Income tax benefit(32,126) (25,208) (27,524)
Share-based compensation expense7,877
 7,629
 6,640
Amortization of debt issue costs and other5,666
 5,060
 5,186
Other, net(7,694) (6,071) (387)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(13,375) (20,680) 619
Accounts payable, accrued liabilities and other(15,794) (5,555) (22,334)
Total adjustments47,060
 (105,549) 87,908
Net cash provided by operating activities394,139
 377,724
 359,891
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(20,372) (290,729) (169,447)
Capital expenditures(358,104) (346,645) (367,180)
Proceeds from dispositions of real estate402,162
 535,513
 367,571
Purchases of corporate assets(8,899) (7,540) (6,665)
Changes in restricted cash1,506
 1,374
 (429)
Other investing activities(1,589) 10,254
 5,253
Net cash provided by (used in) investing activities14,704
 (97,773) (170,897)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt312,434
 417,714
 352,602
Principal repayments on non-recourse property debt(409,167) (371,947) (514,294)
Proceeds from term loan250,000
 
 
Net borrowings (repayments) on revolving credit facility49,230
 (9,070) (85,330)
Proceeds from issuance of common partnership units to Aimco
 
 366,580
Redemption of preferred units from Aimco
 (34,799) (27,000)
Payment of distributions to preferred units(16,358) (17,253) (18,042)
Payment of distributions to General Partner and Special Limited Partner(225,377) (206,279) (184,082)
Payment of distributions to Limited Partners(10,667) (10,214) (6,701)
Payment of distributions to noncontrolling interests(8,367) (18,253) (43,757)
Purchases of noncontrolling interests in consolidated real estate partnerships(314,269) (13,941) (320)
Other financing activities(20,760) (5,454) (6,832)
Net cash used in financing activities(393,301) (269,496) (167,176)
NET INCREASE IN CASH AND CASH EQUIVALENTS15,542
 10,455
 21,818
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD61,244
 50,789
 28,971
CASH AND CASH EQUIVALENTS AT END OF PERIOD$76,786
 $61,244
 $50,789





 2018 2017 2016
CASH FLOWS FROM OPERATING ACTIVITIES:     
Net income$716,603
 $347,079
 $483,273
Adjustments to reconcile net income to net cash provided by operating activities:     
Depreciation and amortization377,786
 366,184
 333,066
Provision for real estate impairment loss
 35,881
 
Gain on dispositions of real estate and the Asset Management business(677,463) (300,849) (400,156)
Income tax benefit(13,027) (30,836) (18,842)
Share-based compensation expense8,550
 7,877
 7,629
Amortization of debt issue costs and other9,023
 5,666
 5,060
Other, net1,065
 (7,694) (6,071)
Changes in operating assets and operating liabilities:     
Accounts receivable and other assets(27,830) (15,841) (22,294)
Accounts payable, accrued liabilities and other1,681
 (15,395) (5,164)
Total adjustments(320,215) 44,993
 (106,772)
Net cash provided by operating activities396,388
 392,072
 376,501
CASH FLOWS FROM INVESTING ACTIVITIES:     
Purchases of real estate and deposits related to purchases of real estate(242,297) (20,372) (290,729)
Capital expenditures(340,489) (358,104) (346,645)
Proceeds from dispositions of real estate708,848
 401,983
 535,513
Purchases of corporate assets(7,718) (8,899) (7,540)
Proceeds from repayments on notes receivable5,010
 430
 412
Other investing activities(1,508) (2,019) 9,842
Net cash provided by (used in) investing activities121,846
 13,019
 (99,147)
CASH FLOWS FROM FINANCING ACTIVITIES:     
Proceeds from non-recourse property debt1,228,027
 312,434
 417,714
Principal repayments on non-recourse property debt(976,087) (409,167) (371,947)
(Repayment of) proceeds from term loan(250,000) 250,000
 
Net borrowings on (repayments of) revolving credit facility93,200
 49,230
 (9,070)
Payment of debt issue costs(11,961) (4,751) (7,816)
Payment of debt extinguishment costs(14,241) (399) (391)
Repurchases of common partnership units held by General Partner and Special Limited Partner(373,593) 
 
Redemption of preferred units from Aimco
 
 (34,799)
Payment of distributions to preferred units(16,334) (16,358) (17,253)
Payment of distributions to General Partner and Special Limited Partner(237,504) (225,377) (206,279)
Payment of distributions to Limited Partners(11,987) (10,668) (10,214)
Payment of distributions to noncontrolling interests(9,469) (8,367) (18,253)
Redemption of common and preferred units(9,885) (13,546) (12,544)
Purchases of noncontrolling interests in consolidated real estate partnerships(3,579) (314,269) (13,941)
Other financing activities5,233
 (2,462) 844
Net cash used in financing activities(588,180) (393,700) (283,949)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH(69,946) 11,391
 (6,595)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF PERIOD142,541
 131,150
 137,745
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD$72,595
 $142,541
 $131,150



See notes to the consolidated financial statements.

AIMCO PROPERTIES, L.P.
CONSOLIDATED STATEMENTS OF CASH FLOWS
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In thousands)

2017 2016 20152018 2017 2016
SUPPLEMENTAL CASH FLOW INFORMATION:          
Interest paid$196,438
 $200,278
 $207,087
$199,996
 $196,438
 $200,278
Cash paid for income taxes7,401
 2,152
 2,033
11,522
 7,401
 2,152
Non-cash transactions associated with the acquisition or disposition of real estate:          
Non-recourse property debt assumed by buyer in connection with the disposition of real estate
 
 6,068
Non-recourse property debt assumed by buyer in connection with the disposition of the Asset Management business227,708
 
 
Non-recourse property debt assumed in connection with the acquisition of real estate208,885
 
 
Issuance of preferred OP Units in connection with acquisition of real estate
 17,000
 

 
 17,000
Issuance of common OP Units in connection with acquisition of real estate50,151
 
 
Other non-cash investing and financing transactions:          
Accrued capital expenditures (at end of period)31,719
 35,594
 43,725
40,185
 31,719
 35,594
Accrued dividends on TSR restricted stock and LTIP awards (at end of period) (Note 8)1,818
 927
 309
2,217
 1,818
 927



































See notes to the consolidated financial statements.

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
December 31, 20172018

Note 1 — Organization
Apartment Investment and Management Company, or Aimco, is a Maryland corporation incorporated on January 10, 1994. Aimco is a self-administered and self-managed real estate investment trust, or REIT. AIMCO Properties, L.P., or the Aimco Operating Partnership, is a Delaware limited partnership formed on May 16, 1994, to conduct our business, which is focused on the ownership, management, redevelopment and limited development of quality apartment communities located in someseveral of the largest markets in the United States.
Aimco, through its wholly-owned subsidiaries, AIMCO-GP, Inc. and AIMCO-LP Trust, owns a majority of the ownership interests in the Aimco Operating Partnership. Aimco conducts all of its business and owns all of its assets through the Aimco Operating Partnership. Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are referred to as OP Units. OP Units include common partnership units, which we refer to as common OP Units, as well as partnership preferred units, which we refer to as preferred OP Units. As of December 31, 2017,2018, after eliminations for units held by consolidated subsidiaries, the Aimco Operating Partnership had 164,617,537158,140,169 common partnership units outstanding. As of December 31, 2017,2018, Aimco owned 157,189,447149,133,826 of the common partnership units (95.5%(94.3% of the common partnership units) of the Aimco Operating Partnership and Aimco had outstanding an equal number of shares of its Class A Common Stock, which we refer to as Common Stock.
Except as the context otherwise requires, “we,” “our” and “us” refer to Aimco, the Aimco Operating Partnership and their consolidated subsidiaries, collectively.
As of December 31, 2017,2018, we owned an equity interest in 136134 apartment communities with 36,90436,549 apartment homes in our Real Estate portfolio. Our Real Estate portfolio, which comprises our reportable segment, is diversified by both price point and geography and consists of market rate apartment communities in which we own a substantial interest. We consolidated 132130 of these apartment communities with 36,76236,407 apartment homes.
As of December 31, 2017, we also held nominal ownership positions in partnerships that own 46 low-income housing tax credit apartmenthomes and these communities with 6,898 apartment homes. We provide services to these partnerships and receive fees and other payments in return. Our relationship with these partnerships is different than real estate ownership and is better described as an asset management business, or Asset Management. In accordance with accounting principles generally accepted in the United States of America, or GAAP, we are required to consolidate partnerships owning an aggregate of 39 apartment communities with 6,211 apartment homes.comprise our reportable segment.
Note 2 — Basis of Presentation and Summary of Significant Accounting Policies
Principles of Consolidation
Aimco’s accompanying consolidated financial statements include the accounts of Aimco, the Aimco Operating Partnership and their consolidated subsidiaries. The Aimco Operating Partnership’s consolidated financial statements include the accounts of the Aimco Operating Partnership and its consolidated subsidiaries.subsidiaries (see Note 13). All significant intercompany balances have been eliminated in consolidation.
Interests in the Aimco Operating Partnership that are held by limited partners other than Aimco are reflected in Aimco’s accompanying consolidated balance sheets as noncontrolling interests in Aimco Operating Partnership. Interests in partnerships consolidated intoby the Aimco Operating Partnership that are held by third parties are reflected in our accompanying consolidated balance sheets as noncontrolling interests in consolidated real estate partnerships. The assets of real estate partnerships consolidated by the Aimco Operating Partnership must first be used to settle the liabilities of such consolidated real estate partnerships. These consolidated real estate partnerships’ creditors do not have recourse to the general credit of the Aimco Operating Partnership.
As used herein, and except where the context otherwise requires, “partnership” refers to a limited partnership or a limited liability company and “partner” refers to a partner in a limited partnership or a member of a limited liability company.
Acquisition of Real Estate and Related Depreciation and Amortization
We generally recognize the acquisition of apartment communities or interests in partnerships that own apartment communities at our cost. The related transaction costs are generally included in the cost of the acquired apartment community.

We allocate the cost of apartment communities acquired based on the relative fair value of the assets acquired and liabilities assumed. We determine the fair value of tangible assets, such as land, buildings, furniture, fixtures and equipment, generally using valuation techniques that consider comparable market transactions, replacement costs and other available information. We determine the fair value of identified intangible assets (or liabilities),or liabilities, which typically relate to in-place leases, using valuation techniques that consider the terms of the in-place leases, current market data for comparable leases and our experience in leasing similar communities. The intangible assets or liabilities related to in-place leases are comprised of: (a) the value of the above- and below-market leases in-place, measured over the period, including probable lease renewals for below-market leases, that the leases are

expected to remain in effect; (b) the estimated unamortized portion of avoided leasing commissions and other costs that ordinarily would be incurred to originate the in-place leases; and (c) the value associated with leased apartment homes during an estimated absorption period, (estimates ofwhich estimates rental revenue that would not have been earned had leased apartment homes been vacant at the time of acquisition, assuming lease-up periods based on market demand and stabilized occupancy levels).levels.
Depreciation for all tangible assets is calculated using the straight-line method over their estimated useful lives. Acquired buildings and improvements are depreciated over a useful life based on the age, condition and other physical characteristics of the apartment community. At December 31, 2017,2018, the weighted average depreciable life of our buildings and improvements was approximately 28 years. Furniture, fixtures and equipment associated with apartment communities are depreciated over five years.
The above- and below-market lease intangibles are amortized to rental revenue over the expected remaining terms of the associated leases, which include reasonably assured renewal periods. Other intangible assets related to in-place leases are amortized to depreciation and amortization over the expected remaining terms of the associated leases.
At December 31, 20172018 and 2016,2017, deferred income in our consolidated balance sheets included below-market lease amounts totaling $9.1$18.7 million and $10.4$9.1 million, respectively, which are net of accumulated amortization of $34.4$36.7 million and $33.1$34.4 million, respectively. During the years ended December 31, 2018, 2017 2016 and 2015,2016, we included amortization of below-market leases of $1.3$2.3 million, $1.7$1.3 million and $1.7 million, respectively, in rental and other property revenues in our consolidated statements of operations.
At December 31, 2017,2018, our below-market leases had a weighted average amortization period of 6.26.3 years and estimated aggregate amortization for each of the five succeeding years as follows (in thousands):
 Estimated AmortizationEstimated Amortization
2018 
$1,128
2019 998

$1,986
2020 886
1,741
2021 811
1,668
2022 763
1,621
20231,571
Capital Additions and Related Depreciation
We capitalize costs, including certain indirect costs, incurred in connection with our capital additions activities, including redevelopments, developments, other tangible apartment community improvements and replacements of existing apartment community components. Included in these capitalized costs are payroll costs associated with time spent by site employees in connection with capital additions activities at the apartment community level. We characterize as “indirect costs” an allocation of certain department costs, including payroll, at the area operations and corporate levels that clearly relate to capital additions activities. We also capitalize interest, property taxes and insurance during periods in which redevelopments, developments and construction projects are in progress. We begin capitalization of costs, including certain indirect costs, incurred in connection with our capital addition activities, upon commencement of activities necessary to getready apartment communities ready for their intended use. These activities include when apartment communities or apartment homes are undergoing physical construction, as well as when apartment homes are held vacant in advance of planned construction, provided that other activities such as permitting, planning and design are in progress. We cease the capitalization of costs when the apartment communities are substantially complete and ready for their intended use, which is typically when construction has been substantially completed and apartment homes are available for occupancy. Costs, including ordinary repairs, maintenance and resident turnover costs, are charged to property operating expense as incurred.
We depreciate capitalized costs using the straight-line method over the estimated useful life of the related improvement, which is generally 5, 15 or 30 years. All capitalized site payroll costs and indirect costs are allocated to capital additions proportionately based on direct costs, and depreciated over the estimated useful lives of such capital additions.

Certain homogeneous items that are purchased in bulk on a recurring basis, such as carpeting and appliances, are depreciated using group methods that reflect the average estimated useful life of the items in each group. Except in the case of apartment community casualties, where the net book value of the lost asset is written off in the determination of casualty gains or losses, we generally do not recognize any loss in connection with the replacement of an existing apartment community component because normal replacements are considered in determining the estimated useful lives used in connection with our composite and group depreciation methods.

For the years ended December 31, 2018, 2017 2016 and 2015,2016, we capitalized to buildings and improvements $7.6 million, $9.6$7.6 million and $11.7$9.6 million of interest costs, respectively, and $36.8 million, $36.0 million $32.9 million and $28.2$32.9 million of other direct and indirect costs, respectively.
Impairment of Long-Lived Assets
Real estate and other long-lived assets to be held and used are stated at cost, less accumulated depreciation and amortization, unless the carrying amount of the asset is not recoverable. If events or circumstances indicate that the carrying amount of an apartment community may not be recoverable, we make an assessment of its recoverability by comparing the carrying amount to our estimate of the undiscounted future cash flows, excluding interest charges, of the apartment community. If the carrying amount exceeds the aggregate undiscounted future cash flows, we recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value of the apartment community.
Cash Equivalents
We classify highly liquid investments with an original maturity of three months or less as cash equivalents. We maintain cash equivalents in financial institutions in excess of insured limits. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.
Restricted Cash
Restricted cash includes capital replacement reserves, completion repair reserves, bond sinking fund amounts, tax and insurance escrow accounts held by lenders and resident security deposits.
Other Assets
At December 31, 20172018 and 2016,2017, other assets was comprised of the following amounts (dollars in thousands):
 2017 2016
Investments in securitization trust that holds Aimco property debt$82,794
 $76,063
Accumulated unrecognized deferred tax expense from intercompany transfers
 62,468
Deferred tax asset, net (Note 9)32,227
 5,076
Intangible assets, net38,701
 39,039
Prepaid expenses, commissions, real estate taxes and insurance36,508
 37,082
Software, equipment and leasehold improvements20,048
 22,209
Investments in unconsolidated real estate partnerships12,636
 12,496
Accounts receivable, net11,417
 13,042
Deferred expenses, deposits, notes receivable and other38,408
 26,293
Other assets per consolidated balance sheets$272,739
 $293,768
As discussed under the Accounting Pronouncements Adopted in the Current Year heading, on January 1, 2017, we recognized a cumulative effect adjustment to retained earnings and partners’ capital, which reduced to zero the accumulated unrecognized deferred tax expense from intercompany transfers.
 2018 2017
Investments in securitization trust that holds Aimco property debt$83,587
 $82,794
Deferred tax asset, net (Note 9)67,060
 32,227
Intangible assets, net43,424
 38,701
Prepaid expenses, real estate taxes and insurance25,657
 25,144
Software, equipment and leasehold improvements18,309
 20,048
Investments in unconsolidated real estate partnerships12,650
 12,636
Accounts and notes receivable, net55,630
 17,035
Deferred costs, deposits and other45,224
 44,154
Total other assets$351,541
 $272,739
The table above excludes other assets of partnerships served by our Asset Management business whichat December 31, 2017, as they are presented separately on our consolidated balance sheet.
Investments in Securitization Trust that holds Aimco Property Debt
We hold investments in a securitization trust that primarily holds certain of our property debt. These investments were initially recognized at their purchase price and the discount to the face value is being accreted into interest income over the expected term of the securities. We have designated these investments as available for sale, or AFS, debt securities and we measure these investments at fair

value with changes in their fair value, other than the changes attributed to the accretion described above, recognized as an adjustment of accumulated other comprehensive income or loss within equity and partners’ capital. Refer to Note 11 for further information regarding these debt securities.
Intangible Assets
At December 31, 20172018 and 2016,2017, other assets included goodwill associated with our reportable segment of $37.8 million. We perform an annual impairment test of goodwill by evaluating qualitative factors to determine the likelihood that goodwill may be impaired. We primarily consider the fair value of our real estate portfolio and the fair value of our debt relative to their carrying values. As a result of the qualitative analysis, we do not believe our goodwill is impaired as of the date of our annual test.
During the years ended December 31, 2016 and 2015, we allocated $4.5 million and $1.2 million, respectively, of goodwill related to our reportable segments to the carrying amounts of the apartment communities sold or classified as held for sale. The amounts of goodwill allocated to these apartment communities were based on the relative fair values of the apartment communities sold or classified as held for sale. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading, commencing in 2017 we no longer allocate goodwill to the carrying amounts of apartment communities sold or classified as held for sale that do not meet the definition of a business.
Capitalized Software Costs, Equipment and Leasehold Improvements
Purchased software and other costs related to software purchased or developed for internal use are capitalized during the application development stage and are amortized using the straight-line method over the estimated useful life of the software, generally three to five years. ForPurchased equipment is recognized at cost and depreciated using the years ended December 31, 2017, 2016 and 2015, we capitalized software purchase and development costs totaling $2.0 million, $3.4 million and $3.6 million, respectively. At December 31, 2017 and 2016, other assets included $9.1 million and $12.6 millionstraight-line method over the estimated useful life of net capitalized software, respectively. During the years ended December 31, 2017, 2016 and 2015, we recognized amortization of capitalized software of $5.5 million, $7.2 million and $6.9 million, respectively,asset, which is included in depreciationgenerally five years. Leasehold improvements are also recorded at cost and amortization in our consolidated statementsdepreciated on a straight-line basis over the shorter of operations.the asset’s estimated useful life or the term of the related lease.
Investments in Unconsolidated Real Estate Partnerships
We own general and limited partner interests in partnerships that either directly, or through interests in other real estate partnerships, own apartment communities. We generally account for investments in real estate partnerships that we do not consolidate under the equity method. Under the equity method, we recognize our share of the earnings or losses of the entity for the periods presented, inclusive of our share of any impairments and disposition gains recognized by and related to such entities, and we present such amounts within other, net in our consolidated statements of operations.
The excess of the cost of the acquired partnership interests over the historical carrying amount of partners’ equity or deficit is generally ascribed to the fair values of land and buildings owned by the partnerships. We amortize the excess cost related to the buildings over the related estimated useful lives. Such amortization is recorded as an adjustment of the amounts of earnings or losses we recognize from such unconsolidated real estate partnerships.
Deferred Costs
We defer, as debt issue costs, lender fees and other direct costs incurred in obtaining new financing and amortize the amounts over the terms of the related loan agreements. AmortizationIn connection with the modification of existing financing arrangements, we defer lender fees and amortize these costs is included in interest expense.and any unamortized debt issue costs over the term of the modified loan agreement. Debt issue costs associated with our revolving credit facility are included in other assets on our consolidated balance sheets. Debt issue costs associated with non-recourse property debt and our term loan are presented as a direct deduction from the related liabilities on our consolidated balance sheets. When financing arrangements are repaid or otherwise extinguished prior to maturity, unamortized debt issue costs are written off, additionally, any lender fees or other costs incurred in connection with the extinguishment are recognized. Amortization and write-off of debt issue costs and other extinguishment costs are included in interest expense on our consolidated statements of operations.
We defer leasing commissions and other direct costs incurred in connection with successful leasing efforts and amortize the costs over the terms of the related leases. Beginning in 2019, in connection with our adoption of the new accounting standard for leases, which is further discussed under the Recent Accounting Pronouncements heading below, such costs will be deferred when they are incremental and would not have incurred if the contract had not been obtained. Amortization of these costs is included in depreciation and amortization.
Noncontrolling Interests in Consolidated Real Estate Partnerships
We report the unaffiliated partners’ interests in the net assets of our consolidated real estate partnerships as noncontrolling interests in consolidated real estate partnerships within consolidated equity and partners’ capital. Noncontrolling interests in consolidated real estate partnerships consist primarily of equity interests held by limited partners in consolidated real estate partnerships that have finite lives. We generally attribute to noncontrolling interests their share of income or loss of consolidated partnerships based on their proportionate interest in the results of operations of the partnerships, including their share of losses even if such attribution results in a deficit noncontrolling interest balance within our equity and partners’ capital accounts.

The terms of the related partnership agreements generally require the partnerships to be liquidated following the sale of the underlying real estate. As the general partner in these partnerships, we ordinarily control the execution of real estate sales and other events that could lead to the liquidation, redemption or other settlement of noncontrolling interests.
Changes in our ownership interest in consolidated real estate partnerships generally consist of our purchase of an additional interest in or the sale of our entire interest in a consolidated real estate partnership. The effect on our equity and partners’ capital of our purchase of additional interests in consolidated real estate partnerships during the years ended December 31, 2018, 2017 2016 and 2015,2016, is shown in our consolidated statements of equity and partners’ capital. The effect on our equity and partners’ capital of sales of consolidated real estate or sales of our entire interest in consolidated real estate partnerships is reflected in our consolidated financial statements as gains on disposition of real estate and accordingly the effect on our equity and partners’ capital is reflected within the amount of net income allocated to us and to noncontrolling interests. Upon our deconsolidation of a real estate partnership following the sale of our partnership interests or liquidation of the partnership following sale of the related apartment community,

we derecognize any remaining noncontrolling interest of the associated partnership previously recorded in our consolidated balance sheets.
Noncontrolling Interests in Aimco Operating Partnership
Noncontrolling interests in Aimco Operating Partnership consist of common OP Units and preferred OP Units. Holders of preferred OP Units participate in the Aimco Operating Partnership’s income or loss only to the extent of their preferred distributions. Within Aimco’s consolidated financial statements, after provision for Preferred OP Unit distributions, the Aimco Operating Partnership’s income or loss is allocated to the holders of common partnership units based on the weighted average number of common partnership units (including those held by Aimco) outstanding during the period. During the years ended December 31, 2018, 2017 2016 and 2015,2016, the holders of common OP Units had a weighted average ownership interest in the Aimco Operating Partnership of 4.5%4.9%, 4.7%4.5% and 4.7%, respectively. See Note 7 for further information regarding the items comprising noncontrolling interests in the Aimco Operating Partnership.
Revenue Recognitionfrom Leases
Our apartment communities have operating leases with apartment residents with terms averaging 1213 months. We recognize rental revenue related to these leases, net of any concessions, on a straight-line basis over the term of the lease. We recognize revenues from asset managementOur operating leases with residents also provide that the resident reimburse us for certain costs, primarily the resident’s share of utilities expenses, incurred by the apartment community. These reimbursements are variable payments pursuant to the related lease and recognized as income when the utility expense is incurred. Reimbursement and related expense are presented on a gross basis in our consolidated statements of operations, with the reimbursement included in rental and other services when the related fees are earned and realized or realizable.property revenues on our consolidated statements of operations.
Asset Management Business
We arePrior to the general partner inJuly 2018 sale of our Asset Management business, we provided asset management and other services to certain consolidated partnerships owning apartment communities that qualify for low-income housing tax credit partnerships, whichcredits and are structured to provide for the pass-through of tax credits and tax deductions to their partners. We recognized income from asset management and other services when the related fees were earned and realized or realizable.
The tax credits arewere generally realized ratably over the first ten years of the tax credit arrangement and are subject to the partnership’s compliance with applicable laws and regulations for a period of 15 years. We holdheld nominal ownership positions in these partnerships, generally less than one percent. At inception, each investor agreedpercent, and sold these interests to fund capital contributions to the partnerships and we received a syndication fee from the partnerships upon the investors’ admission to the partnership.an unrelated third party in July 2018. In our role, we provideprovided asset management and other services to these partnerships and we receivereceived fees and other payments in return. To the extent amounts due to us are not paid currently, the balances accrue and are satisfied from the partnerships’ future operating or liquidating cash flow.
Capital contributions received by the partnerships from tax credit investors represent,represented, in substance, consideration that we receivereceived in exchange for our obligation to deliver tax credits and other tax benefits to the investors. We recordrecorded these contributions as deferred income in our consolidated balance sheets upon receipt, and we recognizerecognized these amounts as revenue in our consolidated statements of operations when our obligation to the investors is relieved upon delivery of the tax benefits. This obligation transferred to the buyer along with our interest in the partnerships.
We consolidatePrior to the sale of our interests in the partnerships, we consolidated the low-income housing tax credit partnerships in which we arewere the sole general partner, as further discussed in Note 13.because we were the sole decision maker of the partnerships. When the contractual arrangements obligateobligated us to deliver tax benefits to the investors, and entitleentitled us through fee arrangements to receive substantially all available cash flow from the partnerships, we recognizerecognized the income or loss generated by the underlying real estate based on our economic interest in the partnerships’ current period results, which iswas approximately 100% and representsrepresented the allocation of cash available for distribution we would receive from a hypothetical liquidation at the book value of the partnership’s net assets. Our economic interestinterests generally differed from our legal interests. Upon the sale of our interests in these partnerships, will be 100% untilwe deconsolidated these partnerships and removed the limited partners become entitledobligation to an allocationdeliver future tax credits and benefits, represented by the remaining deferred income as a component of distributable cash (generally uponour gain on the sale of the underlying real estate). Our economic interest generally differs from our legal interest.business.
Insurance
We believe our insurance coverages insure our apartment communities adequately against the risk of loss attributable to fire, earthquake, hurricane, tornado, flood and other perils. In addition, we have third-party insurance coverage (after self-insured

retentions) that defray the costs of large workers’ compensation, health and general liability exposures. We accrue losses based upon our estimates of the aggregate liability for uninsured losses incurred using certain actuarial assumptions followed in the insurance industry and based on our experience.

Share-Based Compensation
We issue various forms of share-based compensation, including stock options and restricted stock awards with service conditions and/or market conditions. We recognize share-based employee compensation based on the fair value on the grant date and recognize compensation cost over the awards’ requisite service periods. We reduce compensation cost related to forfeited awards in the period of forfeiture. See Note 8 for further discussion of our share-based compensation.
Income Taxes
Aimco has elected to be taxed as a REIT under the Internal Revenue Code commencing with its taxable year ended December 31, 1994, and it intends to continue to operate in such a manner. Aimco’s current and continuing qualification as a REIT depends on its ability to meet the various requirements imposed by the Internal Revenue Code, which are related to organizational structure, distribution levels, diversity of stock ownership and certain restrictions with regard to owned assets and categories of income. If Aimco qualifies for taxation as a REIT, it will generally not be subject to United States federal corporate income tax on its taxable income that is currently distributed to stockholders. This treatment substantially eliminates the “double taxation” (at the corporate and stockholder levels) that generally results from an investment in a corporation.
Even if Aimco qualifies as a REIT, it may be subject to United States federal income and excise taxes in various situations, such as on our undistributed income. Aimco also will be required to pay a 100% tax on any net income on non-arm’s length transactions between it and a TRS (described below) and on any net income from sales of apartment communities that were held for sale in the ordinary course. The state and local tax laws may not conform to the United States federal income tax treatment, and Aimco may be subject to state or local taxation in various state or local jurisdictions, including those in which we transact business. Any taxes imposed on us reduce our operating cash flow and net income.
Certain of our operations or a portion thereof, including property management and risk management, are conducted through taxable REIT subsidiaries, which are subsidiaries of the Aimco Operating Partnership, and each of which we refer to as a TRS. A TRS is a subsidiary C-corporation that has not elected REIT status and as such is subject to United States federal corporate income tax. We use TRS entities to facilitate our ability to offer certain services and activities to our residents and investment partners that cannot be offered directly by a REIT. We also use TRS entities to hold investments in certain apartment communities.
For our TRS entities, deferred income taxes result from temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for United States federal income tax purposes, and are measured using the enacted tax rates and laws that are expected to be in effect when the differences reverse. We reduce deferred tax assets by recording a valuation allowance when we determine, based on available evidence, that it is more likely than not that the assets will not be realized. As further discussed under the Accounting Pronouncements Adopted in the Current Year heading within this note, commencing in 2017, weWe recognize the tax consequences associated with intercompany transfers between the Aimco Operating Partnership and TRS entities when such transactions occur. Refer to Note 9 for further information about our income taxes.
Comprehensive Income or Loss
As discussed under the preceding Investments in Securitization Trust that holds Aimco Property Debt heading, we have investments in debt securities that are measured at fair value with unrealized gains or losses recognized as an adjustment of accumulated other comprehensive loss within equity and partners’ capital. Additionally, as discussed in Note 11,during the year ended December 31, 2018, we recognizerecognized changes in the fair value of our cash flow hedges as an adjustment of accumulated other comprehensive loss within equity and partners’ capital.capital until the July 2018 sale of the Asset Management business. The amounts of consolidated comprehensive income for the years ended December 31, 2018, 2017 2016 and 2015,2016, along with the corresponding amounts of such comprehensive income attributable to Aimco, the Aimco Operating Partnership and to noncontrolling interests, are presented within the accompanying consolidated statements of comprehensive income.
Earnings per Share and Unit
Aimco and the Aimco Operating Partnership calculate earnings (loss) per share and unit based on the weighted average number of shares of Common Stock or common partnership units, participating securities, common stock or common unit equivalents and dilutive convertible securities outstanding during the period. The Aimco Operating Partnership considers both common partnership units and equivalents, which have identical rights to distributions and undistributed earnings, to be common units for purposes of the earnings per unit computations. See Note 10 for further information regarding earnings per share and unit computations.

Use of Estimates
The preparation of our consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts included in the financial statements and accompanying notes thereto. Actual results could differ from those estimates.

Reclassifications
Certain items included in the 2017 and 2016 and 2015consolidated financial statements have been reclassified to conform to the current presentation. We have also reclassified certain items on our consolidated statements of operations to comply with the SEC disclosure amendments summarized below.
Accounting Pronouncements Adopted in the Current Year
During 2017, we elected to adopt early the new accounting standard that revised the GAAP definition of a business. Under the new standard we expect apartment communities will no longer be considered businesses; therefore, transaction costs incurred related to the acquisition of real estate operations will be capitalized as a cost of the acquisition. Additionally, we will no longer allocate goodwill to sales of apartment communities for purposes of calculating gain or loss upon sale. We have applied the new standard prospectively to transactions occurring after adoption, which did not have a significant effect on our financial condition or results of operations.
Effective January 1, 2017,2018, we adopted a new standard issued by the Financial Accounting Standards Board, or FASB, that simplifies theaffects accounting for revenue. Under this new standard, revenue is generally recognized when an entity has transferred control of goods or services to a customer for an amount reflecting the consideration to which the entity expects to be entitled for such exchange.
The new revenue standard also introduced new guidance for accounting for other income, tax consequences of intercompany transfers of assets. Previously, the recognition within the statement of operations of income tax expenseincluding how we measure gains or benefit resulting from an intercompany transfer of assets did not occur until the assets affect GAAP income or loss, for example, through depreciation, impairment or uponlosses on the sale of the asset to a third-party. Underreal estate. We adopted the new standard we are required to recognizeusing the income tax expense or benefit from an intercompany transfer of assets when the transfer occurs. We have applied this change on a modified retrospective basis and recognized a cumulative effect adjustment to retained earnings and partners’ capital of $65.7 million as of January 1, 2017, representing accumulated unrecognized tax expense from intercompany transfers between the Aimco Operating Partnership and TRS entities. Such amounts were included in other assets within our consolidated balance sheets at December 31, 2016.
Alsotransition method effective January 1, 2017,2018, with no effect on our results of operations or financial position.
Effective January 1, 2018, we also adopted guidancenew standards issued by the FASB that simplifiesaffect the accounting for share-based compensation. Under prior practice, tax benefits in excess of those associated with compensation cost recognized in accordance with GAAP, or windfalls, were recorded in equitypresentation and tax deficiencies were recorded in equity until previous windfalls had been recovered and then recognized in earnings. Under the new guidance, alldisclosure of the tax effects relatedstatements of cash flows. We are now required to share-based compensation are recognized through earnings. This guidance is applied to all windfallspresent combined inflows and tax deficiencies resulting from settlements occurring after January 1, 2017.outflows of cash, cash equivalents, and restricted cash in the consolidated statement of cash flows. Previously our consolidated statements of cash flows presented transfers between restricted and unrestricted cash accounts as operating, financing and investing cash activities depending on the required or intended purpose for the restricted funds. The new guidance also requires windfallsdebt prepayment and other extinguishment-related payments to be recordedclassified as financing activities. We previously classified such payments as operating activities. We have revised our consolidated statements of cash flows for the years ended December 31, 2017 and 2016 to conform to this presentation, and the effect of the revisions to net cash flows from operating, investing, and financing activities as previously reported are summarized in the periodfollowing table (in thousands):
 2017 2016
 As Previously Reported Adjustments As Revised As Previously Reported Adjustments As Revised
Net cash provided by operating activities$394,139
 $(2,067) $392,072
 $377,724
 $(1,223) $376,501
Net cash used in investing activities14,704
 (1,685) 13,019
 (97,773) (1,374) (99,147)
Net cash used in financing activities(393,301) (399) (393,700) (269,496) (14,453) (283,949)
In 2018, the related transaction triggeringSecurities Exchange Commission, or SEC, amended its rules to eliminate, modify, or integrate into other SEC requirements certain disclosure rules. The amendments are intended to simplify compliance without significantly changing the total mix of information provided to investors and were generally effective on November 5, 2018. The amendments remove the SEC rule that requires REITs to present gain or loss on the sale of real estate, net of income tax, consequences occurs, suchin the statement of operations. Consistent with the SEC’s historical requirements, we previously presented gain or loss on dispositions of real estate below continuing operations and net of tax. For the year ended December 31, 2018, we present gain on dispositions of real estate as an exercisea component of stock optionsincome before income taxes in our consolidated statements of operations and we have revised the 2017 and 2016 comparative periods to conform to this presentation as follows:
 2017 2016
 As Previously Reported Adjustments As Revised As Previously Reported Adjustments As Revised
Income tax benefit32,126
 (1,290) 30,836
 25,208
 (6,366) 18,842
Gain on dispositions of real estate299,559
 1,290
 300,849
 393,790
 6,366
 400,156
Additionally, SEC rules previously required changes in equity subsequent to the prior year-end as either a separate financial statement or vesting of restricted shares. This change in timing of recognition has been appliedthe notes to interim financial statements. For interim periods in 2018, we presented changes in equity within a footnote to our interim condensed consolidated financial statements in accordance with the SEC rule. The amendments create a requirement to report changes in equity and dividends per share in interim periods on a modified retrospective basis. We did not record a cumulative effect adjustment to opening retained earnings oncomparative basis for both quarter-to-date and year-to-date periods presented. This disclosure is required for interim financial statements beginning in 2019; therefore, we will present comparative interim statements of stockholders equity beginning in our condensed consolidated financial statements for the date of adoption as there were no accumulated windfalls recorded in equity. Compared to prior periods, we may experience incremental volatility in income tax benefit or expense resulting from the recognition in earnings of windfall benefits or deficiencies upon the exercise of stock options and vesting of restricted shares.three months ending March 31, 2019.

Recent Accounting Pronouncements
The FASB has issued new standards that affect accounting for revenue from contracts with customers and are effective for us on January 1, 2018. The new revenue standards establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersede most current GAAP applicable to revenue recognition. The core principle of the new guidance is that revenue should only be recognized when an entity has transferred control of goods or services to a customer and for an amount reflecting the consideration to which the entity expects to be entitled for such exchange. We have completed our analysis of the effect this guidance will have on our consolidated financial statements and have determined we will not recognize a cumulative effect adjustment upon adoption. We do not anticipate changes to the timing or amount of revenue we recognize on an ongoing basis as substantially all of our revenue is earned from leases and is subject to the current lease standard until the adoption of the new lease standard, which is discussed below.
The FASB has also issued a new standard on lease accounting, which is effective for us on January 1, 2019. Under the new lease standard, lessor accounting will be largely unchanged butand lessees will be required to recognize a lease liability and related right of use asset and a lease liability for virtually all leases with terms longer than 12 months, with such leases classified as either operating or finance. The new standard mustmay be adopted utilizing multiple practical expedients, and we plan to adopt the standard using a modified retrospective method, which requires applicationall practical expedients that aid in calculating the value of the new guidance atlease liability and related right of use asset on the beginningdate of adoption, as well as the earliest comparative period presentedprospective practical expedient that allows lessors to combine lease and provides for certain practical expedients, which we anticipate electing. nonlease components where the timing and pattern of transfer are the same.
We do not anticipate significant changes in the timing of income recognition from our leases with residents. However, in circumstances where we are a lessee, in primarily a limited population of ground leases and leases for corporate office space, we will be required to recognize lease liabilities and related right of use assets and related lease liabilities on our consolidated balance sheets. We do not anticipate the adoption of this standard will have a material

effect on our financial condition or results of operations. We are in the process of determining the amount of therecording lease liabilities and related right of use assets and related lease liabilities thatin amounts less than 1.5% of total assets as of December 31, 2018. Additionally, our adoption of the standard will be recognized upon adoption.
During 2016,affect the FASB also issued an Accounting Standards Update that is intendedmanner in which we recognize costs incurred to reduce diversity inobtain resident leases. Through December 31, 2018, we deferred certain costs based on the classification and presentationpercentage of changes in restricted cash insuccessful leases relative to all leasing candidates. Under the statement of cash flows and is effective for us on January 1, 2018. The new standard, requiresonly costs that the statementare contingent upon a signed lease may be deferred. We do not anticipate recording significant cumulative catch up adjustments in connection with our adoption of cash flows describe the changes in the combined balances of cash and cash equivalents and restricted cash during the period. The guidance is required to be applied retrospectively to each period presented in the financial statements. We currently present transfers between restricted and unrestricted cash accounts as operating, investing and financing activities depending upon the required or intended purpose for the restricted funds, and cash receipts and payments directly with third parties to or from restricted cash accounts are presented on the statement of cash flows as a net change in restricted cash and classified similarly to transfers between restricted and unrestricted cash. We expect that the primary change to our statement of cash flows will be the presentation of activity in the restricted cash accounts combined with similar activity in unrestricted accounts.this standard.
Note 3 — Significant Transactions
Reacquisition of Limited Partner Interest in Palazzo Joint Venture
During the year ended December 31, 2017, we reacquired for $451.5 million, the 47% noncontrolling limited partner interest in the Palazzo joint venture, which owns three communities with a total of 1,382 apartment homes located in Los Angeles, California. We assumed $140.5 million of the noncontrolling interest partner’s share of existing non-recourse property-level debt and paid $311.0 million in cash consideration, which was funded by short term borrowings. We now own all of the interests in the Palazzo joint venture and its underlying apartment communities. Prior to the transaction, we consolidated into our financial statements the joint venture and underlying apartment communities, therefore this transaction has been accounted for as an equity transaction. In accordance with GAAP, we recognized the $155.6 million of consideration paid in excess of the noncontrolling interest balance as a reduction of additional paid-in capital within Aimco’s equity and the Aimco Operating Partnership’s partners’ capital.
Acquisitions of Apartment Communities
During the year ended December 31, 2016, we purchased a 463-apartment community in Redwood City, California that was in the final stages of construction at the time of acquisition. At closing, we paid $303.0 million in cash and issued $17.0 million of 6.0% Class Ten preferred OP Units to the seller. The purchase price, plus $1.8 million of capitalized transaction costs, was allocated as follows: $26.9 million to land; $292.7 million to buildings and improvements (including construction in progress); and $2.2 million to furniture and fixtures.
In February 2018, we purchased a 748-apartment home communityacquired apartment communities located in Arlington, Virginia, Fairfax County, Virginia for $160.0 million. Based onand in the timingCenter City and University City areas of this acquisition, we have not completed our purchase price allocation.
Dispositions of Apartment Communities and Assets Held for Sale
Philadelphia. Summarized information regarding apartment communities sold during the years ended December 31, 2017, 2016 and 2015these acquisitions is set forth in the table below (dollars in thousands):
 2017 2016 2015
Real Estate portfolio:     
Apartment communities sold5
 7
 11
Apartment homes sold2,291
 3,045
 3,855
Gain on disposition, net of tax297,944
 377,280
 180,593
Consolidated partnerships served by the Asset Management business:     
Apartment communities sold2
 1
 
Apartment homes sold252
 296
 
Gain on disposition, net of tax1,615
 16,510
 
 2018
Number of apartment communities6
Number of apartment homes1,480
Purchase price (1)$483,066
Capitalized transaction costs7,591
Total fair value allocated to land69,177
Total fair value allocated to building and improvements424,718
Total fair value allocated to intangible assets9,700
Total fair value allocated to intangible liabilities12,938
(1)The gross purchase price of the Philadelphia portfolio consisted of $34.4 million in cash, $208.9 million of assumed property-level debt and the issuance of 1.2 million OP Units. In accordance with GAAP, the OP Units were valued at $41.08 per unit, the closing price of Aimco’s common share on May 1, 2018, the purchase date.
Dispositions of Apartment Communities and Assets Held for Sale
During the year ended December 31, 2018, we sold for $590.0 million our Asset Management business and our four affordable apartment communities located in the Hunters Point area of San Francisco. The sale resulted in a gain of $500.3 million and net cash proceeds of $512.2 million, after payment of transaction costs and repayment of property-level debt encumbering the Hunters Point apartment communities. In addition to the Hunters Point apartment communities, we sold the following apartment communities from our Real Estate portfolio during the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
 2018 2017 2016
Real Estate portfolio:     
Apartment communities sold4
 5
 7
Apartment homes sold1,334
 2,291
 3,045
Gain on dispositions of real estate$175,213
 $297,730
 $383,647

The apartment communities sold from our Real Estate portfolio during 2018, 2017 2016 and 20152016 were predominantly located outside of our primary markets or in lower-rated locations within our primary markets and had average revenues per apartment home significantly below those of our retained portfolio.
In JanuaryDuring the year ended December 31, 2018, we agreed to sellsold our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. AsWe provided seller financing with a resultstated value of $48.6 million and received net cash proceeds of approximately $5.0 million in the settlement, we recognizedsale.

inDuring the years ended December 31, 2017 and 2016, the consolidated partnerships served by our 2017 resultsAsset Management business sold a total of operations athree apartment communities for gross impairment lossproceeds of $35.8$10.9 million $25.6and $27.5 million, of which relates to the establishment of a deferred tax liability assumed in connection with our acquisition of the business entities. Upon closing of the transaction, the tax liability will be assumed by the buyer,respectively, and resulting in no economic loss to Aimco.gains on dispositions of $2.6 million and $16.5 million, respectively.
In addition to the apartment communities we sold during the periods presented, from time to time we may be marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such communities meet the criteria to be classified as held for sale. As of December 31, 2017,2018, we had threetwo apartment communities with 513782 apartment homes in our Real Estate portfolio that were classified as held for sale. In January 2018,2019, we sold thesethe apartment homescommunities for a gain on disposition of $51.0$87.5 million, net of tax, and gross proceeds of $71.9$141.2 million, resulting in $64.6$114.9 million of net proceeds to Aimco. Proceeds from the sales were primarily used to repay outstanding borrowings under our Credit Agreement.
Napico Disposition
In 2012, we sold the Napico business. The transaction was primarily seller-financed, and the associated notes were scheduled to be repaid from the operation and liquidation of the Napico business and were collateralized by the buyer’s interests in the portfolio. During 2016, the buyer paid in full the seller-financed notes as well as an agreed upon final payment representing future contingent consideration that may have been due under the terms of the sale. As a result, we derecognized the net assets and liabilities of the Napico business with the exception of the amounts related to one community in which we had continuing involvement in the form of a legal interest in the community and a guarantee related to property-level debt. We recognized a gain of $5.2 million in other, net on our consolidated statement of operations for the year ended December 31, 2016. We also wrote off a deficit balance in noncontrolling interests in consolidated real estate partnerships associated with the Napico business of $8.1 million, which is recorded in net income attributable to noncontrolling interests in consolidated real estate partnerships for the year ended December 31, 2016.
In 2017, the owner refinanced the mortgage related to the final community, resulting in the release of our remaining guarantee, which allowed us to transfer the nominal general partner interest in the community to the buyer. In connection with the transfer, we reduced other assets and accrued liabilities and other by $34.5 million and $38.4 million, respectively, and recognized a gain of $7.1 million, net of tax, in other, net in our consolidated financial statements for the year ended December 31, 2017.
Note 4 — Non-Recourse Property Debt and Credit Agreement
Non-Recourse Property Debt (Real Estate Portfolio)
We finance apartment communities in our Real Estate portfolio primarily using property-level, non-recourse, long-dated, fixed-rate, amortizing debt. The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 20172018 and 20162017 (in thousands):
2017 20162018 2017
Fixed-rate property debt$3,480,378
 $3,564,979
$3,676,882
 $3,480,378
Variable-rate property debt82,663
 83,644
260,118
 82,663
Debt issue costs, net of accumulated amortization(17,932) (18,347)(21,695) (17,932)
Non-recourse property debt, net$3,545,109
 $3,630,276
$3,915,305
 $3,545,109
Fixed-rate property debt matures at various dates through January 2055, and has interest rates that range from 2.73% to 8.05%7.14%, with a weighted average interest rate of 4.64%4.22%. Principal and interest on fixed-rate debt are generally payable monthly or in monthly interest-only payments with balloon payments due at maturity. At December 31, 2017,2018, each of the fixed-rate loans payable related to apartment communities classified as held for use were secured by one of 9882 apartment communities that had an aggregate grossnet book value of $6.3$4.2 billion.
Variable-rate property debt matures at various dates through July 2033, and had interest rates that ranged from 1.00%3.55% to 3.06%3.67%, as of December 31, 2017,2018, with a weighted average interest rate of 2.70%3.61% at December 31, 2017.2018. Principal and interest on variable-rate debt are generally payable in semi-annual installments with balloon payments due at maturity. As of December 31, 2017,2018, our variable-rate property debt related to apartment communities classified as held for use were each secured by seveneight apartment communities that had an aggregate grossnet book value of $204.2$239.5 million.
These non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2017,2018, we were in compliance with all such covenants.

As of December 31, 2017,2018, the scheduled principal amortization and maturity payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands):
Amortization MaturitiesAmortization Maturities
2018$74,807
 $173,733
201971,792
 481,136
$77,791
 $168,554
202065,362
 296,967
79,592
 78,930
202149,542
 741,523
2021 (1)69,995
 611,039
202239,778
 233,439
64,991
 283,629
202355,450
 337,871
Thereafter  1,334,962
  2,109,158
Total  $3,563,041
  $3,937,000
(1)Pursuant to the terms of our loan agreements, we may prepay in 2020 $246.5 million of loans maturing in 2021, without penalty.
Credit AgreementFacility
We have a senior secured credit agreementfacility with a syndicate of financial institutions, which we refer to as the Credit Agreement.institutions. Our Credit Agreementcredit facility provides for $600.0$800.0 million of revolving loan commitments. As of December 31, 2018 and 2017, we had $160.4 million and $67.2 million, respectively, of outstanding borrowings under our revolving credit facility. The interest rate on our outstanding borrowings was 3.93% and 3.26% at December 31, 2018 and 2017, respectively. As of December 31, 2018, after outstanding borrowings and $7.1 million of undrawn letters of credit backed by the Credit Agreement, our available borrowing capacity was $632.5 million. During the year ended December 31, 2018, we repaid the $250.0 million term loan in full.
Borrowings against the revolving loan commitments bear interest at a rate set forth on a pricing grid, which rate varies based on our credit rating as assigned by specified rating agencies (LIBOR plus 1.20%, or, at our option, a base rate plus 0.20% at December 31, 2017)2018). The Credit Agreementcredit facility matures on January 22, 2022. The Credit Agreementcredit facility provides that we may make distributions to our investors during any four consecutive quarters in an aggregate amount that does not exceed the greater of 95% of our Funds From Operations for such period, subject to certain non-cash adjustments, or such amount as may be necessary to maintain Aimco’s REIT status.
During 2017, we amended the Credit Agreement to add a $250.0 million term loan, which we used to fund a portion of the reacquisition of our limited partner’s interest in the Palazzo joint venture. The term loan matures on June 30, 2018, includes a one-year extension option, subject to the satisfaction of customary conditions, and bears interest at 30-day LIBOR plus 1.35%. We paid lender and other fees of $1.0 million in connection with the term loan, which have been deferred and are amortized as additional interest using the effective interest method.
As of December 31, 2017 and 2016, we had $67.2 million and $17.9 million of outstanding borrowings under our revolving loan commitments, respectively. The interest rate on our outstanding borrowings was 3.26% and 2.09% at December 31, 2017 and 2016, respectively. As of December 31, 2017, after outstanding borrowings and $11.5 million of undrawn letters of credit backed by the Credit Agreement, our available borrowing capacity was $521.3 million.
Non-Recourse Property Debt (Asset Management Business)
The partnerships served by the Asset Management business finance apartment communities using property-level, non-recourse, long-dated, fixed-rate, amortizing debt. The following table summarizes non-recourse property debt related to assets classified as held for use at December 31, 2017 and 2016 (in thousands):
 2017 2016
Fixed-rate property debt231,374
 241,024
Debt issue costs, net of accumulated amortization(4,233) (4,598)
Non-recourse property debt, net$227,141
 $236,426
Fixed-rate property debt secured by these communities matures at various dates through February 2061, and has interest rates that range from 2.50% to 8.50%, with a weighted average interest rate of 5.11%. At December 31, 2017, each of the fixed-rate loans payable related to apartment communities classified as held for use were secured by one of 39 apartment communities that had an aggregate gross book value of $551.1 million.
These non-recourse property debt instruments contain covenants common to the type of borrowing, and at December 31, 2017, the partnerships served by our Asset Management business were in compliance with all such covenants.

As of December 31, 2017, the scheduled payments for the non-recourse property debt related to apartment communities classified as held for use were as follows (in thousands):
 Scheduled Payments
2018$5,959
20196,192
20209,317
202117,090
20224,714
Thereafter188,102
Total$231,374
Note 5 — Commitments and Contingencies
Commitments
In connection with our redevelopment, development and capital improvement activities, we have entered into various construction-related contracts and we have made commitments to complete redevelopment of certain apartment communities, pursuant to financing or other arrangements. As of December 31, 2017,2018, our commitments related to these capital activities totaled approximately $91.1$207.0 million, most of which we expect to incur during the next 12 months.
We enter into certain commitments for future purchases of goods and services in connection with the operations of our apartment communities. Those commitments generally have terms of one year or less and reflect expenditure levels comparable to our historical expenditures.
Tax Credit Arrangements
For various consolidated partnerships served by our Asset Management business, we are required to manage the partnerships and related apartment communities in compliance with various laws, regulations and contractual provisions that apply to historic and low-income housing tax credit syndication arrangements. In some instances, noncompliance with applicable requirements could result in projected tax benefits not being realized by the limited partners in these partnerships and would require a refund or reduction of investor capital contributions, which are reported as deferred income in our consolidated balance sheets until such time as our obligation to deliver tax benefits is relieved. The remaining compliance periods for the tax credit syndication arrangements range from less than one year to eight years. We do not anticipate that any material refunds or reductions of investor capital contributions will be required in connection with these arrangements.
Legal Matters
In addition to the matters described below, we are a party to various legal actions and administrative proceedings arising in the ordinary course of business, some of which are covered by our general liability insurance program, and none of which we expect to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
Environmental
Various federal, state and local laws subject apartment community owners or operators to liability for management, and the costs of removal or remediation, of certain potentially hazardous materials that may be present in the land or buildings of an apartment community. Such laws often impose liability without regard to fault or whether the owner or operator knew of, or was responsible for, the presence of such materials. The presence of, or the failure to manage or remediate properly, these materials may adversely affect occupancy at such apartment communities as well as the ability to sell or finance such apartment communities. In addition, governmental agencies may bring claims for costs associated with investigation and remediation actions. Moreover, private plaintiffs may potentially make claims for investigation and remediation costs they incur or for personal injury, disease, disability or other infirmities related to the alleged presence of hazardous materials. In addition to potential environmental liabilities

or costs associated with our current apartment communities, we may also be responsible for such liabilities or costs associated with communities we acquire or manage in the future, or apartment communities we no longer own or operate.
We are engaged in discussions with the Environmental Protection Agency, or EPA, and the Indiana Department of Environmental Management, or IDEM, regarding contaminated groundwater in a residential area in the vicinity ofnear an Indiana apartment community that has not been owned by us since 2008. The contamination allegedly derives from a dry cleaner that operated on our former property, prior to our ownership. We have undertakenundertook a voluntary remediation of the dry cleaner contamination under IDEM’s

oversight, and in previous years accrued our share of the then-estimated cleanup and abatement costs. oversight. In 2016, EPA listed our former community and a number of residential communities in the vicinity on the National Priorities List, or NPL (i.e. as a Superfund site),. In May 2018, we prevailed on our federal judicial appeal vacating the Superfund listing. We continue to work with EPA and IDEM has formally sought to terminate us from the voluntary remediation program. We continue discussions with both agencies on potential long-term solutions. We have filed a formal appealidentify options for clean-up of the EPA listing and the IDEM termination of us from the voluntary remediation program.site. Although the outcome of these processes are uncertain, we do not expect their resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We also have been contacted by regulators and the current owner of a property in Lake Tahoe, California, regarding environmental issues allegedly stemming from the historic operation of a dry cleaner. An entity owned by us was the former general partner of a now-dissolved partnership that previously owned a site that was used for dry cleaning. That entity and the current property owner have been remediating the dry cleaner site since 2009, under the oversight of the Lahontan Regional Water Quality Control Board, or Lahontan. In May 2017, Lahontan issued a final cleanup and abatement order that names four potentially-responsible parties, acknowledges that there may be additional responsible parties, and requires the named parties to perform additional groundwater investigation and corrective actions with respect to onsite and offsite contamination. We are appealing the final order while simultaneously complying with it. Although the outcome of this process is uncertain, we do not expect its resolution to have a material adverse effect on our consolidated financial condition, results of operations or cash flows.
We have determined that our legal obligations to remove or remediate certain potentially hazardous materials may be conditional asset retirement obligations, as defined in GAAP. Except in limited circumstances where the asset retirement activities are expected to be performed in connection with a planned construction project or apartment community casualty, we believe that the fair value of our asset retirement obligations cannot be reasonably estimated due to significant uncertainties in the timing and manner of settlement of those obligations. Asset retirement obligations that are reasonably estimable as of December 31, 2017,2018, are immaterial to our consolidated financial condition, results of operations and cash flows.
Operating Leases
We are obligated under non-cancelable operating leases for office space. We are also obligated under non-cancelable operating leases for the ground under certain of our apartment communities with remaining terms ranging from 4652 years to 7099 years. Approximate minimumMinimum annual rental payments under operating leases are as follows (in thousands):
Office Lease Obligations Ground Lease Obligations Total Operating Lease ObligationsOffice Lease Obligations Ground Lease Obligations Total Operating Lease Obligations
2018$2,203
 $1,179
 $3,382
20191,050
 1,279
 2,329
$2,237
 $2,114
 $4,351
2020963
 1,514
 2,477
2,821
 2,350
 5,171
2021832
 1,550
 2,382
2,719
 2,439
 5,158
2022628
 1,550
 2,178
2,582
 2,492
 5,074
20231,871
 2,492
 4,363
Thereafter
 79,337
 79,337
10,644
 422,169
 432,813
Total$5,676
 $86,409
 $92,085
$22,874
 $434,056
 $456,930
Substantially all of the office space subject to the operating leases in the table above is for the use of our corporate offices and area operations. Rent expense is generally recognized on a straight-line basis and totaled $2.8 million, $3.0 million $3.3 million and $3.2$3.3 million for the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively. Rent expense recognized for the ground leases totaled $2.3 million, $1.8 million $1.7 million and $0.9$1.7 million for the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively, and is included within interest expense in the accompanying statements of operations.

Note 6 — Aimco Equity
Preferred Stock
At December 31, 20172018 and 2016,2017, Aimco had a single class of perpetual preferred stock outstanding, its Class A Cumulative Preferred Stock, with 5,000,000 shares authorized, issued and outstanding and with a balance of $125.0 million as of December 31, 20172018 and 2016.2017.
Aimco’s Class A Preferred Stock has a $0.01 per share par value, is senior to Aimco’s Common Stock, has a liquidation preference per share of $25.00 and is redeemable at our option on or after May 17, 2019. The holders of Preferred Stock are generally not entitled to vote on matters submitted to stockholders. Dividends at an annual rate of 6.88% are subject to declaration by Aimco’s Board of Directors.

Directors and accrue if not declared.
During the year ended December 31, 2016, Aimco redeemed all of the outstanding shares of its Class Z Cumulative Preferred Stock at a redemption value of $34.8 million. We reflected the $0.7 million excess of the redemption value over the carrying amount and $1.3 million of previously deferred issuance costs as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2016.
During the year ended December 31, 2015, Aimco redeemed the remaining outstanding shares, or $27.0 million in liquidation preference, of its Series A Community Reinvestment Act, or CRA, Preferred Stock. We reflected $0.7 million of issuance costs as an adjustment of net income attributable to preferred stockholders for the year ended December 31, 2015.
In connection with these redemptionsthe redemption of Aimco preferred stock, the Aimco Operating Partnership redeemed from Aimco a number of Partnership Preferred Units equal to the number of shares redeemed or repurchased by Aimco.
Common Stock
During the years ended December 31, 2018, 2017 2016 and 2015,2016, Aimco declared dividends per common share of $1.52, $1.44 $1.32 and $1.18,$1.32, respectively.
DuringOn February 3, 2019, Aimco’s Board of Directors authorized a reverse stock split, in which every 1.03119 Aimco common share will be combined into one Aimco common share, effective at the year endedclose of business on February 20, 2019. On the same date, the Board of Directors also declared a special dividend on the Aimco common stock that consists of $67.1 million in cash and 4.5 million shares of Aimco common stock. The special dividend will be payable on March 22, 2019, to stockholders of record as of February 22, 2019. The special dividend amount includes the regular quarterly cash dividend, which for 2019 is expected to be $0.39 per share. Stockholders will have the opportunity to elect to receive the special dividend in the form of all cash or all stock, subject to proration if either option is oversubscribed. The reverse split was authorized in order to neutralize the dilutive impact of the stock issued in the special dividend. As a result, total shares outstanding following completion of both the special dividend and the reverse stock split are expected to be unchanged from the total shares outstanding immediately prior to the transactions. Some stockholders may have more Aimco shares and some may have fewer based on their individual elections.
Pro forma Earnings per Share (unaudited)
In financial statements issued after the effective date of the reverse stock split, we are required to retroactively recognize the reverse stock split in the calculation of basic and diluted earnings per share. The shares issued in connection with the special dividend will be included in the calculation of basic and diluted earnings per share on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse stock split had been effective prior to issuance of these financial statements, basic and diluted weighted average shares outstanding and earnings per share for the years ending December 31, 2015, Aimco issued 9,430,000 shares of its Common Stock, par value $0.01 per share,2018, 2017 and 2016 would have been (shares in an underwritten public offering, for net proceeds per share of $38.90. The offering generated net proceeds to Aimco of $366.6 million, net of issuance costs. Aimco contributed the net proceeds from the sale of Common Stock to the Aimco Operating Partnership in exchange for a number of common partnership units equal to the number of shares of Common Stock issued.thousands):
 2018 2017 2016
Weighted average shares, basic151,152
 151,595
 151,282
Weighted average shares, diluted151,334
 152,060
 151,669
Basic earnings per share$4.34
 $2.02
 $2.76
Diluted earnings per share$4.34
 $2.02
 $2.75
Registration Statements
Aimco and the Aimco Operating Partnership have a shelf registration statement that provides for the issuance of debtequity and equitydebt securities by Aimco and debt securities by the Aimco Operating Partnership.

Note 7 — Partners’ Capital
Partnership Preferred Units Owned by Aimco
At December 31, 20172018 and 2016,2017, the Aimco Operating Partnership had outstanding preferred units in classes and amounts similar to Aimco’s Preferred Stock described in Note 6, or Partnership Preferred Units. All of these Partnership Preferred Units were owned by Aimco during the periods presented.
The Partnership Preferred Units are senior to the Aimco Operating Partnership’s common partnership units. The Partnership Preferred Units do not have voting rights, except the right to approve certain changes to the Aimco Operating Partnership’s Partnership Agreement that would adversely affect holders of such class of units. Distributions on Partnership Preferred Units are subject to being declared by the General Partner. The Partnership Preferred Units are redeemable by the Aimco Operating Partnership only in connection with a concurrent redemption by Aimco of the corresponding Aimco Preferred Stock held by unrelated parties.
As discussed in Note 6, during the yearsyear ended December 31, 2016, and 2015, Aimco completed variousredeemed its Class Z Cumulative Preferred Stock redemptions.Stock. In connection with these redemptions,this redemption, the Aimco Operating Partnership redeemed from Aimco a corresponding number of Partnership Preferred Units.

Redeemable Preferred OP Units
In addition to the Partnership Preferred Units owned by Aimco, the Aimco Operating Partnership has outstanding various classes of redeemable Partnership Preferred Units owned by third parties, which we refer to as preferred OP Units. As of December 31, 20172018 and 2016,2017, the Aimco Operating Partnership had the following classes of preferred OP Units (stated at their redemption values, in thousands, except unit and per unit data):
Distributions per Annum Units Issued and Outstanding Redemption ValuesDistributions per Annum Units Issued and Outstanding Redemption Values
Class of Preferred UnitsPercent Per Unit 2017 2016 2017 2016Percent Per Unit 2018 2017 2018 2017
Class One8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
8.75% $8.00
 90,000
 90,000
 $8,229
 $8,229
Class Two1.92% $0.48
 17,750
 17,750
 444
 444
1.92% $0.48
 14,240
 17,750
 356
 444
Class Three7.88% $1.97
 1,338,524
 1,341,289
 33,462
 33,532
7.88% $1.97
 1,338,524
 1,338,524
 33,463
 33,462
Class Four8.00% $2.00
 644,954
 644,954
 16,124
 16,124
8.00% $2.00
 644,954
 644,954
 16,124
 16,124
Class Six8.50% $2.13
 780,036
 780,036
 19,501
 19,501
8.50% $2.13
 773,693
 780,036
 19,342
 19,501
Class Seven7.87% $1.97
 27,960
 27,960
 699
 699
7.87% $1.97
 27,960
 27,960
 699
 699
Class Nine6.00% $1.50
 243,112
 306,890
 6,078
 7,672
6.00% $1.50
 243,112
 243,112
 6,078
 6,078
Class Ten6.00% $1.50
 680,000
 680,000
 17,000
 17,000
6.00% $1.50
 680,000
 680,000
 17,000
 17,000
Total    3,822,336
 3,888,879
 $101,537
 $103,201
    3,812,483
 3,822,336
 $101,291
 $101,537
Each class of preferred OP Units is currently redeemable at the holders’ option. The Aimco Operating Partnership, at its sole discretion, may settle such redemption requests in cash or cause Aimco to issue shares of its Common Stock with a value equal to the redemption price. In the event the Aimco Operating Partnership requires Aimco to issue shares of Common Stock to settle a redemption request, the Aimco Operating Partnership would issue to Aimco a corresponding number of common partnership units. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Subject to certain conditions, the Class Four and Class Six preferred OP Units may be converted into common OP Units.
These redeemable units are classified within temporary equity in Aimco’s consolidated balance sheets and within temporary capital in the Aimco Operating Partnership’s consolidated balance sheets.
During the years ended December 31, 2018, 2017 and 2016, approximately 10,000, 67,000 and 2015, approximately 67,000, 69,000 and 700 preferred OP Units, respectively, were redeemed in exchange for cash, and no preferred OP Units were redeemed in exchange for shares of Aimco Common Stock.
The Class Ten preferred OP Units were issued as partial consideration for an acquisition during the year ended December 31, 2016.

The following table presents a reconciliation of the Aimco Operating Partnership’s preferred OP Units during the years ended December 31, 2018, 2017 and 2016 and 2015 (dollars in(in thousands):
2017 2016 20152018 2017 2016
Balance at January 1$103,201
 $87,926
 $87,937
$101,537
 $103,201
 $87,926
Preferred distributions(7,764) (7,239) (6,943)(7,740) (7,764) (7,239)
Redemption of preferred units and other(1,664) (1,725) (11)(246) (1,664) (1,725)
Issuance of preferred units
 17,000
 

 
 17,000
Net income7,764
 7,239
 6,943
7,740
 7,764
 7,239
Balance at December 31$101,537
 $103,201
 $87,926
$101,291
 $101,537
 $103,201
Common Partnership Units
In the Aimco Operating Partnership’s consolidated balance sheets, the common partnership units held by Aimco are classified within Partners’ Capital as General Partner and Special Limited Partner capital and the common OP Units are classified within Limited Partners’ capital. In Aimco’s consolidated balance sheets, the common OP Units are classified within permanent equity as common noncontrolling interests in the Aimco Operating Partnership.
Common partnership units held by Aimco are not redeemable whereas common OP Units are redeemable at the holders’ option, subject to certain restrictions, on the basis of one common OP Unit for either one share of Common Stock or cash equal to the fair

value of a share of Common Stock at the time of redemption. Aimco has the option to deliver shares of Common Stock in exchange for all or any portion of the common OP Units tendered for redemption. When a limited partner redeems a common OP Unit for Common Stock, Limited Partners’ capital is reduced and the General Partner and Special Limited Partners’ capital is increased.
During the years ended December 31, 2018, 2017 and 2016, approximately 224,000, 268,000 and 248,000 common OP Units, respectively, were redeemed in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.
The holders of the common OP Units receive distributions, prorated from the date of issuance, in an amount equivalent to the dividends paid to holders of Common Stock. During the years ended December 31, 2018, 2017 2016 and 2015,2016, the Aimco Operating Partnership declared distributions per common unit of $1.52, $1.44 and $1.32, respectively
On February 3, 2019, the Board of Directors of the Aimco Operating Partnership’s general partner authorized a reverse unit split in which every 1.03119 common partnership units will be combined into one common partnership unit. The reverse split is effective at the close of business on February 20, 2019, and $1.18, respectively.corresponds to a similar split effected by Aimco with respect to its common shares at the same time. On the same date, the Board of Directors also declared a special distribution to the holders of Aimco Operating Partnership common partnership units that consists of $71.5 million in cash and 4.8 million common partnership units. The special distribution will be payable on March 22, 2019, to unitholders of record as of February 22, 2019. The special distribution also corresponds to a similar special dividend paid at the same time to holders of Aimco common shares. The reverse split was authorized in order to neutralize the dilutive impact of the units issued in the special distribution. As a result, total common partnership units outstanding following completion of both the special distribution and the reverse unit split are expected to be unchanged from the total common partnership units outstanding immediately prior to the transactions.
DuringPro forma Earnings per Common Unit (Unaudited)
In financial statements issued after the effective date of the reverse unit split, we are required to retroactively recognize the reverse unit split in the calculation of basic and diluted earnings per unit. The units issued in connection with the special distribution will be included in the calculation of basic and diluted earnings per unit on a prospective basis, and are therefore not included in the pro forma amounts disclosed below. If the reverse unit split had been effective prior to issuance of these financial statements, basic and diluted weighted average units outstanding and earnings per unit for the years endedending December 31, 2018, 2017 and 2016 and 2015, approximately 98,000, 248,000 and 112,000 common OP Units, respectively, were redeemedwould have been (units in exchange for cash, and no common OP Units were redeemed in exchange for shares of Common Stock.thousands):
 2018 2017 2016
Weighted average units, basic158,890
 158,793
 158,808
Weighted average units, diluted159,073
 159,257
 159,194
Basic earnings per unit$4.35
 $2.02
 $2.76
Diluted earnings per unit$4.34
 $2.02
 $2.75

Note 8 — Share-Based Compensation
We have a stock award and incentive program to attract and retain officers and independent directors. As of December 31, 2017,2018, approximately 0.44.7 million shares were available for issuance under our Amended and Restated 2015 Stock Award and Incentive Plan, or the 2015 Plan. The total number of shares available for issuance under this plan may be increased by an additional 0.70.3 million shares to the extent of any forfeiture, cancellation, exchange, surrender, termination or expiration of an award outstanding under our 2007 Stock Award and Incentive Plan. Awards under the 2015 planPlan may be in the form of incentive stock options, non-qualified stock options and restricted stock, or other types of awards as authorized under the plan.
Our plans are administered by the Compensation and Human Resources Committee of Aimco’s Board of Directors. In the case of stock options, the exercise price of the options granted may not be less than the fair market value of a share of Common Stock at the date of grant.
Total compensation cost recognized for stock based awards was $9.7 million, $9.3 million $8.6 million and $7.2$8.6 million for the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively. Of these amounts, $1.2 million, $1.4 million $1.0 million and $0.5$1.0 million, respectively, were capitalized. At December 31, 2017,2018, total unvested compensation cost not yet recognized was $11.8$11.0 million. We expect to recognize this compensation over a weighted average period of approximately 1.6 years.
We have granted five different types of awards that are outstanding as of December 31, 2017.2018. We have grantedoutstanding stock options and restricted stock awards that are subject to time-based vesting and require continuous employment, typically over a period of four years from the grant date, and we refer to these awards as Time-Based Stock Options and Time-Based Restricted Stock, respectively. We also have also grantedoutstanding stock options, restricted stock awards and two forms of long-term incentive partnership units, or LTIP units, that vest conditioned on Aimco’s total shareholder return, or TSR, relative to the NAREIT Apartment Index (60% weighting) and the MSCI US REIT Index (40% weighting) over a forward-looking performance period of three years. We refer to these awards as TSR Stock Options, TSR Restricted Stock, TSR LTIP I units, and TSR LTIP II units. Vested LTIP II units may be converted at the holders option to LTIP Units for a strike price over a term of ten years. Earned TSR-based awards, if any, will vest 50% on each of the third anniversary and fourth anniversary of the grant date, based on continued employment. The term of Time-Based Stock Options and TSR Stock Options is generally ten years from the date of grant.
We recognize compensation cost associated with Time-Based awards ratably over the requisite service periods, which are typically four years. We recognize compensation cost related to the TSR-based awards, which have graded vesting periods, over the requisite service period for each separate vesting tranche of the award, commencing on the grant date. The value of the TSR-based awards take into consideration the probability that the market condition will be achieved; therefore previously recorded compensation cost is not adjusted in the event that the market condition is not achieved and awards do not vest.

Stock Options
During the years ended December 31, 2018, 2017 and 2016, we granted TSR Stock Options, and during and prior to the year ended December 31, 2015, we granted Time-Based Stock Options.
The following table summarizes activity for our outstanding stock options, for the years ended December 31, 2018, 2017 and 2016 and 2015 (numbers of options(options in thousands):
2017 2016 20152018 2017 2016
Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
 Number of Options Weighted
Average
Exercise
Price
Outstanding at beginning of year675
 $29.55
 1,394
 $30.85
 1,640
 $28.91
648
 $40.08
 675
 $29.55
 1,394
 $30.85
Granted184
 44.07
 216
 38.73
 239
 39.05

 
 184
 44.07
 216
 38.73
Exercised(211) 9.90
 (934) 33.61
 (484) 28.33
(2) 28.33
 (211) 9.90
 (934) 33.61
Forfeited
 
 (1) 29.11
 (1) 25.78

 
 
 
 (1) 29.11
Outstanding at end of year648
 $40.08
 675
 $29.55
 1,394
 $30.85
646
 $40.12
 648
 $40.08
 675
 $29.55
Exercisable at end of year128
 $37.59
 280
 $16.38
 1,155
 $29.16
186
 $38.18
 128
 $37.59
 280
 $16.38
The intrinsic value of a stock option represents the amount by which the current price of the underlying stock exceeds the exercise price of the option. As of December 31, 2017,2018, options outstanding had an aggregate intrinsic value of $2.4$2.5 million and a weighted average remaining contractual term of 7.97.0 years. Options exercisable at December 31, 2017,2018, had an aggregate intrinsic value of $0.8$1.1 million and a weighted average remaining contractual term of 6.75.9 years. The intrinsic value of stock options exercised during the years ended December 31, 2018, 2017 and 2016, and 2015, was $32 thousand, $7.1 million and $11.1 million, and $5.5 million, respectively.

The weighted average grant date fair value of stock options granted during the years ended December 31, 2017 2016 and 20152016 was $11.39 $9.94 and $6.97$9.94 per option, respectively.
Time-Based Restricted Stock Awards
The following table summarizes activity for Time-Based Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 and 2015 (numbers of shares(shares in thousands):
2017 2016 20152018 2017 2016
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year249
 $33.61
 339
 $29.96
 513
 $26.34
160
 $37.63
 249
 $33.61
 339
 $29.96
Granted45
 44.07
 91
 40.03
 145
 39.39
51
 40.01
 45
 44.07
 91
 40.03
Vested(134) 32.35
 (181) 29.99
 (259) 27.54
(86) 34.42
 (134) 32.35
 (181) 29.99
Forfeited
 
 
 
 (60) 32.29
Unvested at end of year160
 $37.63
 249
 $33.61
 339
 $29.96
125
 $40.82
 160
 $37.63
 249
 $33.61
The aggregate fair value of shares that vested during the years ended December 31, 2018, 2017 and 2016 and 2015 was $8.4 million, $6.0 million and $7.0 million, and $10.4 million, respectively.

TSR Restricted Stock Awards
The following table summarizes activity for TSR Restricted Stock awards for the years ended December 31, 2018, 2017 and 2016 and 2015 (numbers of shares(shares in thousands):
2017 2016 20152018 2017 2016
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
 Number of Shares Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year214
 $39.66
 123
 $39.72
 
 $
253
 $40.70
 214
 $39.66
 123
 $39.72
Granted39
 46.39
 91
 39.59
 142
 39.72
45
 41.71
 39
 46.39
 91
 39.59
Forfeited
 
 
 
 (19) 39.72
Vested(123) 39.72
 
 
 
 
Unvested at end of year253
 $40.70
 214
 $39.66
 123
 $39.72
175
 $41.65
 253
 $40.70
 214
 $39.66
TSR LTIP I Units
The following table summarizes activity for TSR LTIP I units for the years ended December 31, 2018 and 2017 (units in thousands):
 2018 2017
 Number of Units Weighted
Average
Grant-Date
Fair Value
 Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year45
 $46.21
 
 $
Granted48
 41.48
 45
 46.21
Unvested at end of year93
 $43.78
 45
 $46.21

TSR LTIP II Units
The following table summarizes activity for TSR LTIP II units for the years ended December 31, 2018 and 2017 (numbers of units in thousands):
20172018
Number of Units Weighted
Average
Grant-Date
Fair Value
Number of Units Weighted
Average
Grant-Date
Fair Value
Unvested at beginning of year
 $

 $
Granted45
 46.21
243
 41.84
Unvested at end of year45
 $46.21
243
 $41.84
Determination of Grant-Date Fair Value of Awards
We estimated the fair value of TSR-based awards granted in 2018, 2017 2016 and 20152016 using a Monte Carlo model using the assumptions set forth in the table below.
The risk-free interest rate reflects the annualized yield of a zero coupon U.S. Treasury security with a term equal to the expected term of the option. The expected dividend yield reflects expectations regarding cash dividend amounts per share paid on Aimco’s Common Stock during the expected term of the option.awards. Expected volatility reflects an average of the historical volatility of Aimco’s Common Stock during the historical period commensurate with the expected term of the options that ended on the date of grant, and the implied volatility is calculated from observed call option contracts closest to the expected term. The derived vesting period of TSR Restricted Stock and TSR LTIP I units was determined based on the graded vesting terms. The expected term of the TSR-options and TSR LTIP II units was based on historical option exercises and post-vesting terminations. The midpoints of our valuation assumptions for the 2018, 2017 2016 and 20152016 grants were as follows:
2017 2016 20152018 2017 2016
Grant date market value of a common share$44.07
 $38.73
 $39.05
$40.95
 $44.07

$38.73
Risk-free interest rate1.57% 1.15% 1.04%2.32% 1.57%
1.15%
Dividend yield3.27% 3.41% 2.87%3.52% 3.27%
3.41%
Expected volatility21.33% 21.24% 19.48%18.02% 21.33%
21.24%
Derived vesting period of TSR Restricted Stock and TSR LTIP units3.4 years
 3.4 years
 3.4 years
Weighted average expected term of TSR Stock Options5.8 years
 5.8 years
 n/a
Derived vesting period of TSR Restricted Stock and TSR LTIP I units3.4 years
 3.4 years

3.4 years
Weighted average expected term of TSR Stock Options and LTIP II units5.6 years
 5.8 years
 5.8 years
The grant date fair value for the Time-Based Restricted Stock awards reflects the closing price of a share of Aimco common stock on the grant date.

Note 9 — Income Taxes
Deferred income taxes reflect the net effects of temporary differences between the carrying amounts of assets and liabilities of the TRS entities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax liabilities and assets are as follows (in thousands):
December 31,December 31,
2017 20162018 2017
Deferred tax liabilities:      
Real estate and real estate partnership basis differences$32,032
 $72,726
$12,058
 $32,032
Deferred tax assets:      
Net operating, capital and other loss carryforwards$9,523
 $8,873
$7,022
 $9,523
Accruals and expenses6,575
 7,537
7,432
 6,575
Tax credit carryforwards73,450
 65,559
67,530
 73,450
Management contracts and other200
 300
2,064
 200
Total deferred tax assets89,748
 82,269
84,048
 89,748
Valuation allowance(25,489) (4,467)(4,930) (25,489)
Net deferred tax assets$32,227
 $5,076
$67,060
 $32,227
In December 2017, the U.S. Congress passed the Tax Cuts and Jobs Act, or the 2017 Act, which is effective for years beginning with 2018. The 2017 Act providesprovided for a reduction in the federal income tax rate. In accordance with GAAP, we revalued our deferred tax assets and liabilities as of December 31, 2017. We have not completedfinalized our accounting for the tax effects of enactment of the 2017 Act; however, we have made a reasonable estimate ofAct during the effects on our existing deferred tax balances,year ended December 31, 2018, resulting in our recognition of a cumulative net tax benefit of $15.9 million.$15.6 million over the two years.
At December 31, 2017,2018, we had federal and state net operating loss carryforwards, or NOLs, for which the deferred tax asset was approximately $9.5$7.0 million, before a valuation allowance of $6.6$4.9 million. The NOLs expire in years 20182019 to 2033.2034. Subject to certain separate return limitations, we may use these NOLs to offset a portion of state taxable income generated by our TRS entities.
As of December 31, 2017,2018, we had low-income housing and rehabilitation tax credit carryforwards and corresponding deferred tax assets of approximately $73.5$67.5 million for income tax purposes that expire in years 20242034 to 2037.2038. In light of the lower federal tax rate under the 2017 Act, our TRS entities must generate more taxable income in future years to utilize tax credit carryforwards, which are recorded as deferred tax assets. As a result, during the year ended December 31, 2017, we recognized a partial valuation allowance of $15.4 million against the deferred tax assets associated with low-income housing and rehabilitation tax credit carryforwards.
At December 31, 2017, we had a real estate partnership basis difference of $4.4 million related Due to the 2017 impairment loss recognized related to the La Jolla Cove propertysale of our Asset Management business, discussed further in Note 3, for whichduring the year ended December 31, 2018, we havereversed the remaining valuation allowance recognized a full valuation allowance.in 2017 against our deferred tax benefits that we now expect to utilize.
A reconciliation of the beginning and ending balance of our unrecognized tax benefits is presented below (in thousands):
2017 2016 20152018 2017 2016
Balance at January 1$2,286
 $2,897
 $2,286
$2,476
 $2,286
 $2,897
Additions (reductions) based on tax positions related to prior years190
 (611) 611
142
 190
 (611)
Balance at December 31$2,476
 $2,286
 $2,897
$2,618
 $2,476
 $2,286
Because the statute of limitations has not yet elapsed, our United States federal income tax returns for the year ended December 31, 20132014 and subsequent years and certain of our State income tax returns for the year ended December 31, 20132014 and subsequent years are currently subject to examination by the IRS or other taxing authorities. If recognized, the unrecognized benefit would affect the effective rate.
In 2014, the IRS initiated an audit of the Aimco Operating Partnership’s 2011 and 2012 tax years. This audit remains in process as of December 31, 2017.2018. We do not believe the audit will have any material effect on our unrecognized tax benefits, financial condition or results of operations.
Our policy is to include any interest and penalties related to income taxes within the income tax line item in our consolidated statements of operations.

In accordance with the accounting requirements for stock-based compensation, we may recognize tax benefits in connection with the exercise of stock options by employees of our TRS entities and the vesting of restricted stock awards. As of December 31, 2017, all cumulative excess tax benefits from employee stock option exercises and vested restricted stock awards had been realized. As further discussed in the Accounting Pronouncements Adopted in the Current Year heading in Note 2, in 2017 we began recognizingWe recognize the tax effects related to stock-basedstock based compensation through earnings in the period the compensation was recognized.
Significant components of the income tax benefit or expense are as follows and are classified within income tax benefit in income before gain on dispositions and gain on dispositions of real estate, net of tax, in our consolidated statements of operations for the years ended December 31, 2018, 2017 2016 and 20152016 (in thousands):
2017 2016 20152018 2017 2016
Current:          
Federal (1)$(938) $5,038
 $1,310
$11,269
 $(938) $5,038
State525
 2,916
 1,357
10,537
 525
 2,916
Total current(413) 7,954
 2,667
21,806
 (413) 7,954
          
Deferred:          
Federal(10,908) (26,173) (27,382)(29,243) (10,908) (26,173)
State(3,621) (623) (1,052)(5,590) (3,621) (623)
Revaluation of deferred taxes due to change in tax rate(15,894) 
 

 (15,894) 
Total deferred(30,423) (26,796) (28,434)(34,833) (30,423) (26,796)
Total benefit$(30,836) $(18,842) $(25,767)$(13,027) $(30,836) $(18,842)
Classification:     
Income before gain on dispositions$(32,126) $(25,208) $(27,524)
Gain on dispositions of real estate$1,290
 $6,366
 $1,757
(1)As a result of the 2017 Act, Alternative Minimum Tax credits that are not used will be refunded before 2022, therefore in 2017 we reclassified $2.7 million in AMT credits from deferred tax assets to receivables, which is included in other assets on our consolidated balance sheet, resulting in a net current federal tax benefit.
Consolidated income or loss subject to tax consists of pretax income or loss of our TRS entities and income and gains retained by the REIT. For the years ended December 31, 2018, 2017 2016 and 2015,2016, we had consolidated net income subject to tax of $158.6 million, net loss subject to tax of $55.6 million and net income subject to tax of $109.3 million and net loss subject to tax of $31.3 million, respectively.
The reconciliation of income tax attributable to operations computed at the United States statutory rate to income tax benefit is shown below (dollars in thousands):
2017 2016 20152018 2017 2016
Amount Percent Amount Percent Amount PercentAmount Percent Amount Percent Amount Percent
Tax (benefit) provision at United States statutory rates on consolidated income or loss subject to tax$(19,459) 35.0 % $38,257
 35.0 % $(10,947) 35.0 %
Tax provision (benefit) at United States statutory rates on consolidated income or loss subject to tax$33,296
 21.0 % $(19,459) 35.0 % $38,257
 35.0 %
State income tax expense, net of federal tax (benefit) expense(1,769) 3.2 % 7,152
 6.5 % (361) 1.2 %12,252
 7.7 % (1,769) 3.2 % 7,152
 6.5 %
Establishment of deferred tax asset related to partnership basis difference (1)(3,501) 6.3 % 
  % 
  %
  % (3,501) 6.3 % 
  %
Effect of permanent differences(1,629) 2.9 % (132) (0.1)% (27) 0.1 %302
 0.2 % (1,629) 2.9 % (132) (0.1)%
Tax effect of intercompany transactions (2)
  % (47,369) (43.3)% (1,515) 4.8 %(33,250) (21.0)% 
  % (47,369) (43.3)%
Tax credits(9,607) 17.3 % (16,750) (15.3)% (13,583) 43.4 %(6,897)
(4.4)% (9,607) 17.3 % (16,750) (15.3)%
Tax reform revaluation (3)(15,894) 28.6 % 
  % 
  %288

0.2 % (15,894) 28.6 % 
  %
Increase in valuation allowance (4)21,023
 (37.8)% 
  % 666
 (2.1)%
(Decrease) increase in valuation allowance (4)(20,434)
(12.9)% 21,023
 (37.8)% 
  %
Other1,416

0.9 % 
  % 
  %
Total income tax benefit$(30,836) 55.5 % $(18,842) (17.2)% $(25,767) 82.4 %$(13,027) (8.3)% $(30,836) 55.5 % $(18,842) (17.2)%
(1)Includes2017 includes the establishment of a deferred tax asset related to partnership basis difference when it became apparent that it would reverse in the foreseeable future. This deferred tax asset iswas fully reserved in the valuation allowance described below.below as of December 31, 2017.
(2)
2016 and 2015 includeincludes the effect of intercompany asset transfers between the Aimco Operating Partnership and TRS entities, for which tax was deferred and recognized as the assets affected GAAP income or loss, for example, through depreciation, impairment, or upon the sale of the asset to a third-party. Effective January 1, 2017, we adopted a new accounting standard applicable to intercompany asset transfers. As a result, the accumulated unrecognized deferred tax expense associated with historical intercompany transfers was recognized as a cumulative effect adjustment through retained earnings at that time, as further described in Note 2.
time. 2018 includes the tax benefit to establish the initial deferred tax asset from the intercompany transfer of a portion of the Asset Management business between the Aimco Operating Partnership and TRS entities.

(3)Reflects revaluation of deferred tax assets and liabilities using the TRS entities’ lower effective tax rates resulting from the 2017 Act. Accounting for the tax effects of enactment of the 2017 Act was finalized during the year ended December 31, 2018.

(4)Includes2017 includes a $15.4 million valuation allowance against the deferred tax assets associated with rehabilitation tax credits due to the lower federal tax rate under the 2017 Act. This valuation allowance was reversed in 2018 as a result of the sale of our Asset Management business.
Income taxes paid totaled approximately $11.5 million, $7.4 million $2.2 million and $2.0$2.2 million in the years ended December 31, 2018, 2017 2016 and 2015,2016, respectively.
For income tax purposes, dividends paid to holders of Common Stock primarily consist of ordinary income, capital gains, qualified dividends and unrecaptured Section 1250 gains, or a combination thereof. For the years ended December 31, 2018, 2017 2016 and 2015,2016, dividends per share held for the entire year were estimated to be taxable as follows:
2017 2016 20152018 2017 2016
Amount Percentage Amount Percentage Amount PercentageAmount Percentage Amount Percentage Amount Percentage
Ordinary income$0.75
 51.5% $0.45
 34.2% $0.36
 30.2%$0.51
 33.4% $0.75
 51.5% $0.45
 34.2%
Capital gains0.51
 35.7% 0.47
 35.4% 0.37
 31.3%0.93
 61.2% 0.51
 35.7% 0.47
 35.4%
Qualified dividends0.02
 1.6% 0.13
 9.9% 0.17
 14.5%
 % 0.02
 1.6% 0.13
 9.9%
Unrecaptured Section 1250 gain0.16
 11.2% 0.27
 20.5% 0.28
 24.0%0.08
 5.4% 0.16
 11.2% 0.27
 20.5%
$1.44
 100.0% $1.32
 100.0% $1.18
 100.0%$1.52
 100.0% $1.44
 100.0% $1.32
 100.0%
Note 10 — Earnings per Share/Unit
Aimco and the Aimco Operating Partnership calculate basic earnings per common share and basic earnings per common unit based on the weighted average number of shares of Common Stock and common partnership units and participating securities outstanding, and calculate diluted earnings per share and diluted earnings per unit taking into consideration dilutive common stock and common partnership unit equivalents and dilutive convertible securities outstanding during the period.
Our common stock equivalents and common partnership unit equivalents include options to purchase shares of Common Stock, which, if exercised, would result in Aimco’s issuance of additional shares and the Aimco Operating Partnership’s issuance to Aimco of additional common partnership units equal to the number of shares purchased under the options. These equivalents also include unvested TSR Restricted Stock awards that do not meet the definition of participating securities, which would result in the issuance of additional common shares and common partnership units equal to the number of shares that vest. The dilutive effect of these securities was dilutive0.2 million shares or units, 0.5 million shares or units, and 0.4 million shares or units, respectively, for the years ended December 31, 2018, 2017 2016, and 2015, and accordingly has been2016. Securities with dilutive effect are included in the denominator for calculating diluted earnings per share and unit during these periods. There were 0.3 million potential shares and 0.3 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the year ended December 31, 2018. There were 0.2 million potential shares and 0.2 million potential units not dilutive and excluded from the denominator for calculating diluted earnings per share and per unit, respectively, for the years ended December 31, 2017 and 2016.
Our Time-Based Restricted Stock awards receive dividends similar to shares of Common Stock and common partnership units prior to vesting and our TSR LTIP I units and TSR LTIP II units receive a percentagedistributions based on specified percentages of the distributions paid to common partnership units prior to vesting.vesting and conversion. These dividends and distributions are not forfeited in the event the awards do not vest. Therefore, the unvested restricted shares and units related to these awards are participating securities. The effect of participating securities is included in basic and diluted earnings per share and unit computations using the two-class method of allocating distributed and undistributed earnings when the two-class method is more dilutive than the treasury stock method. At December 31, 2018, 2017 2016 and 2015,2016, there were 0.20.3 million, 0.2 million and 0.2 million shares of unvested participating restricted securities, respectively. At December 31, 2018, 2017 and 2016, there were 0.6 million, 0.3 million sharesand 0.2 million units of unvested participating restricted securities, respectively.
As discussed in Note 7, the Aimco Operating Partnership has various classes of preferred OP Units, which may be redeemed at the holders’ option. The Aimco Operating Partnership may redeem these units for cash, or at its option, shares of Common Stock. As of December 31, 2017,2018, these preferred OP Units were potentially redeemable for approximately 2.3 million shares of Common Stock (based on the period end market price), or cash. The Aimco Operating Partnership has a redemption policy that requires cash settlement of redemption requests for the preferred OP Units, subject to limited exceptions. Accordingly, we have excluded these securities from earnings per share and unit computations for the periods presented above, and we expect to exclude them in future periods.

Note 11 — Fair Value Measurements
Recurring Fair Value Measurements
We measure at fair value on a recurring basis our investment in the securitization trust that holds certain of our property debt, which we classify as available for sale (AFS)AFS debt securities, and our interest rate swaps, both of which are classified within Level 2 of the GAAP fair value hierarchy.securities.
OurThese investments classified as AFS are presented within other assets in the accompanying consolidated balance sheets. We hold several positions in the securitization trust that pay interest currently and we also hold the first loss position in the securitization

trust, which accrues interest over the term of the investment. WeThese investments were acquired at a discount to face value and we are accreting the discount to the $100.9 million face value of the investments intothrough interest income using the effective interest method over the remaining expected term of the investments, which as of December 31, 2017,2018, was approximately 3.42.4 years. Our amortized cost basis for these investments, which represents the original cost adjusted for interest accretion less interest payments received, was $77.7$83.6 million and $72.5$77.7 million at December 31, 20172018 and 2016,2017, respectively. We estimated the fair value of these investments to be $82.8$88.5 million and $76.1$82.8 million at December 31, 20172018 and 2016,2017, respectively.
Our investments in AFS debt securities are classified within Level 2 of the GAAP fair value hierarchy. We estimate the fair value of these investments using an income and market approach with primarily observable inputs, including yields and other information regarding similar types of investments, and adjusted for certain unobservable inputs specific to these investments. The fair value of the positions that pay interest currently typically moves in an inverse relationship with movements in interest rates. The fair value of the first loss position is primarily correlated to collateral quality and demand for similar subordinate commercial mortgage-backed securities.
Certain consolidated partnerships served by our Asset Management business have entered into interest rate swap agreements, which limit exposure to interest rate risk on the partnerships’ debt by effectively converting the interest from a variable rate to a fixed rate. We estimate the fair value of interest rate swaps using an income approach with primarily observable inputs, including information regarding the hedged variable cash flows and forward yield curves relating to the variable interest rates on which the hedged cash flows are based.
The following table sets forth a summary of changes in fair value in the interest rate swaps (in thousands):
 Year Ended December 31,
 2017 2016 2015
Beginning balance$(3,175) $(4,938) $(5,273)
Realized (unrealized) losses included in interest expense73
 (44) (44)
Realized losses on derecognition of interest rate swaps included in earnings273
 
 
Losses on interest rate swaps reclassified into interest expense from accumulated other comprehensive loss1,207
 1,586
 1,678
Unrealized (losses) gains included in equity and partners’ capital(173) 221
 (1,299)
Ending balance$(1,795) $(3,175) $(4,938)
Realized losses on derecognition of interest rate swaps included in earnings represents previously unrealized losses related to an interest rate swap to which the partnership owning the final Napico property was a party. We wrote off the accumulated other comprehensive income related to this swap in conjunction with the derecognition of the property’s assets and liabilities as discussed in Note 3.
As of December 31, 2017 and 2016, the remaining interest rate swaps, exclusive of the derecognized Napico interest rate swap, had aggregate notional amounts of $22.0 million and $22.4 million, respectively. As of December 31, 2017, these swaps had a weighted average remaining term of 6.0 years. We have designated these interest rate swaps as cash flow hedges. The fair value of these swaps is presented within accrued liabilities and other related to the Asset Management business within our consolidated balance sheets, and we recognize any changes in the fair value as an adjustment of accumulated other comprehensive loss within equity and partners’ capital to the extent of their effectiveness.
If the forward rates at December 31, 2017, remain constant, we estimate that during the next 12 months, we would reclassify into earnings approximately $0.3 million of the unrealized losses in accumulated other comprehensive loss. If market interest rates increase above the 3.26% weighted average fixed rate under these interest rate swaps we will benefit from net cash payments due to us from our counterparty to the interest rate swaps.

Fair Value Disclosures
We believe that the carrying values of the consolidated amounts of cash and cash equivalents, receivables and payables approximates their fair value at December 31, 20172018 and 2016,2017, due to their relatively short-term nature and high probability of realization. The carrying amount of seller financing notes receivable approximated their estimated fair value at December 31, 2018. The carrying amount of the total indebtedness associated with our Real Estate portfolio was approximately $3.9 billion and $3.7 billion at December 31, 2017 and 2016, respectively, as compared to carrying amounts of $3.9 billion and $3.6 billion, respectively. The carrying amounts of the non-recourse property debt of the consolidated partnerships served by our Asset Management business approximated its estimated fair value at December 31, 20172018 and December 31, 2016.2017. We estimate the fair value of our seller financing notes and our consolidated debt using an income and market approach, including comparison of the contractual terms to observable and unobservable inputs such as market interest rate risk spreads, contractual interest rates, remaining periods to maturity, collateral quality and loan to value ratios on similarly encumbered apartment communities within our portfolio. We classify the fair value of our consolidated debt and seller financing notes within Level 3 of the GAAP valuation hierarchy based on the significance of certain of the unobservable inputs used to estimate theirits fair values.value.
Note 12 — Business Segments
During the year ended December 31, 2017, we revised the information regularly reviewed by ourOur chief executive officer, who is our chief operating decision maker, to assess our operating performance. Apartment communities are classified as either part of our Real Estate portfolio or as those owned by partnerships served by our Asset Management business.
Our chief operating decision maker, uses proportionate property net operating income to assess the operating performance of our apartment communities. Proportionate property net operating income reflectsis defined as our share of rental and other property revenuesrevenue less directour share of property operating expenses, including real estate taxes, for consolidated apartment communities we own and manage. Beginning in 2018, we exclude from rental and other property revenues the amount of utilities cost reimbursed by residents and reflect such amount as a reduction of the related utility expense within property operating expenses in our evaluation of segment results. In our consolidated statements of operation, utility reimbursements are included in rental and other property revenues, in accordance with GAAP. The 2017 and 2016 tables below have been revised to conform to this presentation.
Apartment communities are classified as either part of our Real Estate portfolio or, prior to the sale in July 2018, those owned through partnerships served by our Asset Management business. As of December 31, 2017,2018, for segment performance evaluation, our Real Estate segment included 132130 consolidated apartment communities with 36,76236,407 apartment homes and excluded four apartment communities with 142 apartment homes that we neither manage nor consolidate.
AsPrior to the July 2018 sale of December 31, 2017, through our Asset Management business, we alsoconsolidated certain partnerships in which we held nominal ownership positions in consolidatedpositions. These partnerships that own 46 low-income housing tax credit apartment communities with 6,898 apartment homes.communities. Neither the results of operations nor the assets of these partnerships and apartment communities arewere quantitatively material;material during our period of ownership; therefore, we have one reportable segment, Real Estate. The results of operations for the years ended December 31, 2016 and 2015, and the segment assets as of December 31, 2016, shown below have been revised to reflect the change in our reportable segments.
The following tables present the revenues, net operating income and income before gain on dispositions of our Real Estate segment on a proportionate basis (excludingand excluding amounts related to apartment communities sold or classified as held for sale as of December 31, 2017)2018 for the years ended December 31, 2018, 2017 2016 and 20152016 (in thousands):
 Real Estate 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2017:       
Rental and other property revenues attributable to Real Estate$854,491
 $15,481
 $48,176
 $918,148
Rental and other property revenues of partnerships served by Asset Management business
 
 74,046
 74,046
Tax credit and transaction revenues
 
 13,243
 13,243
Total revenues854,491
 15,481
 135,465
 1,005,437
Property operating expenses attributable to Real Estate265,186
 4,887
 48,866
 318,939
Property operating expenses of partnerships served by Asset Management business
 
 35,440
 35,440
Other operating expenses not allocated to reportable
segment (3)

 
 457,075
 457,075
Total operating expenses265,186
 4,887
 541,381
 811,454
Operating income589,305
 10,594
 (405,916) 193,983
Other items included in income before gain on
dispositions (4)

 
 (146,463) (146,463)
Income before gain on dispositions$589,305
 $10,594
 $(552,379) $47,520

Real Estate 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 ConsolidatedReal Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2016:       
Year Ended December 31, 2018:       
Rental and other property revenues attributable to Real Estate$791,587
 $28,509
 $79,795
 $899,891
$854,240
 $34,282
 $34,071
 $922,593
Rental and other property revenues of partnerships served by Asset Management business
 
 74,640
 74,640

 
 42,830
 42,830
Tax credit and transaction revenues
 
 21,323
 21,323

 
 6,987
 6,987
Total revenues791,587
 28,509
 175,758
 995,854
854,240
 34,282
 83,888
 972,410
Property operating expenses attributable to Real Estate251,636
 8,284
 58,037
 317,957
238,860
 32,169
 36,872
 307,901
Property operating expenses of partnerships served by Asset Management business
 
 36,956
 36,956

 
 20,921
 20,921
Other operating expenses not allocated to reportable
segment (3)

 
 394,145
 394,145

 
 427,832
 427,832
Total operating expenses251,636
 8,284
 489,138
 749,058
238,860
 32,169
 485,625
 756,654
Operating income539,951
 20,225
 (313,380) 246,796
Other items included in income before gain on
dispositions (4)

 
 (157,313) (157,313)
Income before gain on dispositions$539,951
 $20,225
 $(470,693) $89,483
Proportionate property net operating income615,380
 
 
 
Other items included in income before income tax benefit (4)
 
 487,820
 487,820
Income before income tax benefit$615,380
 $2,113
 $86,083
 $703,576
Real Estate 
Proportionate
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 ConsolidatedReal Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2015:       
Year Ended December 31, 2017:       
Rental and other property revenues attributable to Real Estate$737,079
 $28,875
 $117,066
 $883,020
$781,194
 $43,043
 $93,911
 $918,148
Rental and other property revenues of partnerships served by Asset Management business
 
 73,934
 73,934

 
 74,046
 74,046
Tax credit and transaction revenues
 
 24,356
 24,356

 
 13,243
 13,243
Total revenues737,079
 28,875
 215,356
 981,310
781,194
 43,043
 181,200
 1,005,437
Property operating expenses attributable to Real Estate240,789
 8,857
 74,933
 324,579
222,731
 32,432
 63,963
 319,126
Property operating expenses of partnerships served by Asset Management business
 
 37,537
 37,537

 
 35,458
 35,458
Other operating expenses not allocated to reportable
segment (3)

 
 362,979
 362,979

 
 456,870
 456,870
Total operating expenses240,789
 8,857
 475,449
 725,095
222,731
 32,432
 556,291
 811,454
Operating income496,290
 20,018
 (260,093) 256,215
Other items included in income before gain on
dispositions (4)

 
 (164,825) (164,825)
Income before gain on dispositions$496,290
 $20,018
 $(424,918) $91,390
Proportionate property net operating income558,463
 
 
 
Other items included in income before income tax benefit (4)
 
 122,260
 122,260
Income before income tax benefit$558,463
 $10,611
 $(252,831) $316,243

 Real Estate 
Proportionate and Other
Adjustments (1)
 
Corporate and
Amounts Not
Allocated to Reportable
Segment (2)
 Consolidated
Year Ended December 31, 2016:       
Rental and other property revenues attributable to Real Estate$720,302
 $55,257
 $124,332
 $899,891
Rental and other property revenues of partnerships served by Asset Management business
 
 74,640
 74,640
Tax credit and transaction revenues
 
 21,323
 21,323
Total revenues720,302
 55,257
 220,295
 995,854
Property operating expenses attributable to Real Estate210,426
 35,468
 72,063
 317,957
Property operating expenses of partnerships served by Asset Management business
 
 36,956
 36,956
Other operating expenses not allocated to reportable
segment (3)

 
 394,145
 394,145
Total operating expenses210,426
 35,468
 503,164
 749,058
Proportionate property net operating income509,876
 
 
 
Other items included in income before income tax benefit (4)
 
 217,635
 217,635
Income before income tax benefit$509,876
 $19,789
 $(65,234) $464,431
(1)Represents adjustments for the noncontrolling interests in consolidated real estate partnerships’ share of the results of consolidated apartment communities in our Real Estate segment, which are included in the related consolidated amounts, but excluded from proportionate property net operating income for our segment evaluation. Also includes the reclassification of utility reimbursements from revenues to property operating expenses for the purpose of evaluating segment results. Utility reimbursements are included in rental and other property revenues in our consolidated statements of operations prepared in accordance with GAAP.
(2)Includes the operating results of apartment communities sold during the periods shown or held for sale at the end of the period, if any, and the operating results of apartment communities owned by consolidated partnerships served by our Asset Management business.business prior to its sale in July 2018. Corporate and Amounts Not Allocated to Reportable Segment also includes property management expenses and casualty gains and losses, (whichwhich are included in consolidated property operating expenses), which are property related items thatexpenses and are not part of our segment performance measure.
(3)Other operating expenses not allocated to reportable segment consists of depreciation and amortization, general and administrative expenses and other operating expenses including provision for real estate impairment loss, which are not included in our measure of segment performance.
(4)Other items included in income before income tax benefit primarily consists of gain on dispositions primarily consist of real estate and interest expense and income tax benefit.expense.

The assets of our reportable segment and the consolidated assets not allocated to our segment are as follows (in thousands):
December 31,December 31,
2017 20162018 2017
Real Estate$5,495,069
 $5,432,642
$5,849,638
 $5,346,390
Corporate and other assets (1)583,971
 800,176
340,366
 732,650
Total consolidated assets$6,079,040
 $6,232,818
$6,190,004
 $6,079,040
(1)
Includes the assets not allocated to our reportable segment, primarily corporate assets, and assets of consolidated partnerships served byapartment communities and the Asset Management business, and apartment communitieswhich were sold or classified as held for sale as of December 31, 20172018.
For the years ended December 31, 2018, 2017 2016 and 2015,2016, capital additions related to our Real Estate segment totaled $338.0$338.8 million, $321.0$321.9 million and $340.3$312.8 million, respectively.
Note 13 — Variable Interest Entities
Generally, a variable interest entity, or VIE, is a legal entity in which the equity investors do not have the characteristics of a controlling financial interest or the equity investors lack sufficient equity at risk for the entity to finance its activities without additional subordinated financial support. A limited partnership is considered a VIE when the majority of the limited partners unrelated to the general partner possess neither the right to remove the general partner without cause, nor certain rights to participate in the decisions that most significantly affect the financial results of the partnership. In determining whether we are the primary beneficiary of a VIE, we consider qualitative and quantitative factors, including, but not limited to: which activities most

significantly impact the VIE’s economic performance and which party controls such activities; the amount and characteristics of our investment; the obligation or likelihood for us or other investors to provide financial support; and the similarity with and significance to our business activities and the business activities of the other investors. Significant judgments related to these determinations include estimates about the current and future fair values and performance of real estate held by these VIEs and general market conditions.
Aimco consolidates the Aimco Operating Partnership, which is a VIE for which Aimco is the primary beneficiary. Aimco, through the Aimco Operating Partnership, consolidates all VIEs for which it is the primary beneficiary.
All of the VIEs we consolidate own interests in one or more apartment communities. VIEs that own apartment communities we classify as part of our Real Estate segment are typically structured to generate a return for their partners through the operation and ultimate sale of the communities. We are the primary beneficiary in the limited partnerships in which we are the sole decision maker and have a substantial economic interest.
Certain partnerships served byAs described in Note 3, we sold our Asset Management business own interests in low-income housing tax credit apartment communities that are structured to provide forJuly 2018, including the pass-through of tax credits and tax deductions to their partners and are VIEs. We hold a nominal ownership positioninterest we held in these partnerships generally one percent or less. As general partner in these partnerships, we are the sole decision maker and we receive fees and other payments in return for the asset management and other services we provide and thus share in the economics of the partnerships, and as such, we are the primary beneficiary of these partnerships. The table below summarizes information regarding VIEs that are consolidatedserved by the Aimco Operating Partnership:this business.
December 31,December 31,
2017 20162018 2017
Real Estate portfolio:      
VIEs with interests in apartment communities14
 179
 14
Apartment communities held by VIEs14
 19
Apartment homes in communities held by VIEs4,321
 6,110
Apartment communities owned by VIEs9
 14
Apartment homes in communities owned by VIEs3,592
 4,321
Consolidated partnerships served by the Asset Management business:      
VIEs with interests in apartment communities49
 50

 49
Apartment communities held by VIEs37
 38
Apartment homes in communities held by VIEs5,893
 6,093
Apartment communities owned by VIEs
 37
Apartment homes in communities owned by VIEs
 5,893

Assets of the Aimco Operating Partnership’s consolidated VIEs must first be used to settle the liabilities of such consolidated VIEs. These consolidated VIEs’ creditors do not have recourse to the general credit of the Aimco Operating Partnership. Assets and liabilities of VIEs are summarized in the table below (in thousands):
December 31,December 31,
2017 20162018 2017
Real Estate portfolio:      
Assets      
Net real estate$529,898
 $897,510
$488,127
 $529,898
Cash and cash equivalents16,111
 15,877
15,416
 16,111
Restricted cash4,798
 7,981
4,461
 4,798
Liabilities      
Non-recourse property debt412,205
 725,061
322,685
 412,205
Accrued liabilities and other10,623
 14,270
13,576
 10,623
Consolidated partnerships served by the Asset Management business:      
Assets      
Real estate, net215,580
 235,920

 215,580
Cash and cash equivalents15,931
 14,926

 15,931
Restricted cash30,107
 32,542

 30,107
Liabilities      
Non-recourse property debt220,356
 229,509

 220,356
Accrued liabilities and other20,241
 16,934

 20,241

Note 14 — Unaudited Summarized Consolidated Quarterly Information
Aimco
Aimco’s summarized unaudited consolidated quarterly information for the years ended December 31, 20172018 and 2016,2017, is provided below (in thousands, except per share amounts):
QuarterQuarter
2017First Second Third Fourth
2018First Second Third Fourth
Total revenues$246,481
 $249,092
 $254,635
 $255,229
$247,720
 $250,187
 $242,481
 $232,022
Operating income57,789
 59,706
 59,205
 17,283
Net income17,155
 21,591
 22,144
 286,189
95,690
 7,156
 603,917
 9,840
Net income attributable to Aimco common stockholders11,491
 15,843
 17,430
 262,097
81,525
 2,817
 567,029
 5,226
Net income attributable to Aimco common stockholders per common
share - basic
$0.07
 $0.10
 $0.11
 $1.68
$0.52
 $0.02
 $3.62
 $0.03
Net income attributable to Aimco common stockholders per common
share - diluted
$0.07
 $0.10
 $0.11
 $1.67
$0.52
 $0.02
 $3.61
 $0.03
QuarterQuarter
2016First Second Third Fourth
2017First Second Third Fourth
Total revenues$246,239
 $251,218
 $248,904
 $249,493
$246,481
 $249,092
 $254,635
 $255,229
Operating income63,534
 64,436
 58,732
 60,094
Net income29,885
 245,953
 30,036
 177,399
17,155
 21,591
 22,144
 286,189
Net income attributable to Aimco common stockholders23,223
 221,382
 11,176
 162,000
11,491
 15,843
 17,430
 262,097
Net income attributable to Aimco common stockholders per common
share - basic
$0.15
 $1.42
 $0.07
 $1.04
$0.07
 $0.10
 $0.11
 $1.68
Net income attributable to Aimco common stockholders per common
share - diluted
$0.15
 $1.41
 $0.07
 $1.03
$0.07
 $0.10
 $0.11
 $1.67
The Aimco Operating Partnership
The Aimco Operating Partnership’s summarized unaudited consolidated quarterly information for the years ended December 31, 20172018 and 2016,2017, is provided below (in thousands, except per unit amounts):
QuarterQuarter
2017First Second Third Fourth
2018First Second Third Fourth
Total revenues$246,481
 $249,092
 $254,635
 $255,229
$247,720
 $250,187
 $242,481
 $232,022
Operating income57,789
 59,706
 59,205
 17,283
Net income17,155
 21,591
 22,144
 286,189
95,690
 7,156
 603,917
 9,840
Net income attributable to the Partnership’s common unitholders12,047
 16,627
 18,246
 274,380
85,274
 2,949
 597,100
 5,551
Net income attributable to the Partnership’s common unitholders per common unit - basic$0.07
 $0.10
 $0.11
 $1.68
$0.52
 $0.02
 $3.62
 $0.03
Net income attributable to the Partnership’s common unitholders per common unit - diluted$0.07
 $0.10
 $0.11
 $1.67
$0.52
 $0.02
 $3.61
 $0.03
QuarterQuarter
2016First Second Third Fourth
2017First Second Third Fourth
Total revenues$246,239
 $251,218
 $248,904
 $249,493
$246,481
 $249,092
 $254,635
 $255,229
Operating income63,534
 64,436
 58,732
 60,094
Net income29,885
 245,953
 30,036
 177,399
17,155
 21,591
 22,144
 286,189
Net income attributable to the Partnership’s common unitholders24,395
 232,517
 11,368
 169,869
12,047
 16,627
 18,246
 274,380
Net income attributable to the Partnership’s common unitholders per common unit - basic$0.15
 $1.42
 $0.07
 $1.04
$0.07
 $0.10
 $0.11
 $1.68
Net income attributable to the Partnership’s common unitholders per common unit - diluted$0.15
 $1.41
 $0.07
 $1.03
$0.07
 $0.10
 $0.11
 $1.67

APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION
December 31, 20172018
(In Thousands Except Apartment Home Data)
   (2)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2017 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Real Estate Segment:Real Estate Segment:   Real Estate Segment:   
100 Forest PlaceHigh RiseDec 1997Oak Park, IL1987234
$2,664
$18,815
$9,965
$2,664
$28,780
$31,444
$(14,718)$16,726
$
High RiseDec 1997Oak Park, IL1987234
$2,664
$18,815
$10,553
$2,664
$29,368
$32,032
$(15,640)$16,392
$35,048
118-122 West 23rd StreetHigh RiseJun 2012New York, NY198742
14,985
23,459
6,520
14,985
29,979
44,964
(7,532)37,432
17,897
High RiseJun 2012New York, NY198742
14,985
23,459
6,752
14,985
30,211
45,196
(9,121)36,075
17,457
173 E. 90th StreetHigh RiseMay 2004New York, NY191072
12,066
4,535
7,725
12,066
12,260
24,326
(2,893)21,433
6,783
High RiseMay 2004New York, NY191072
12,066
4,535
8,068
12,066
12,603
24,669
(3,730)20,939

182-188 Columbus AvenueMid RiseFeb 2007New York, NY191032
19,123
3,300
5,282
19,123
8,582
27,705
(3,371)24,334
14,204
Mid RiseFeb 2007New York, NY191032
19,123
3,300
5,513
19,123
8,813
27,936
(3,968)23,968
13,925
1045 on the Park Apartments HomesMid RiseJul 2013Atlanta, GA201230
2,793
6,662
600
2,793
7,262
10,055
(1,116)8,939
5,750
Mid RiseJul 2013Atlanta, GA201230
2,793
6,662
692
2,793
7,354
10,147
(1,423)8,724
5,627
1582 First AvenueHigh RiseMar 2005New York, NY190017
4,281
752
508
4,281
1,260
5,541
(506)5,035
2,319
High RiseMar 2005New York, NY190017
4,281
752
499
4,281
1,251
5,532
(578)4,954
2,273
21 FitzsimonsMid-RiseAug 2014Aurora, CO2008600
12,864
104,720
16,930
12,864
121,650
134,514
(13,639)120,875
47,097
Mid RiseAug 2014Aurora, CO2008600
12,864
104,720
20,379
12,864
125,099
137,963
(19,590)118,373
90,000
234 East 88th StreetMid-RiseJan 2014New York, NY190020
2,448
4,449
755
2,448
5,204
7,652
(875)6,777
3,296
Mid RiseJan 2014New York, NY190020
2,448
4,449
807
2,448
5,256
7,704
(1,154)6,550
3,223
236-238 East 88th StreetHigh RiseJan 2004New York, NY190043
8,820
2,914
2,051
8,820
4,965
13,785
(1,835)11,950
11,122
High RiseJan 2004New York, NY190043
8,820
2,914
2,681
8,820
5,595
14,415
(1,930)12,485
10,875
237-239 Ninth AvenueHigh RiseMar 2005New York, NY190036
8,495
1,866
3,235
8,495
5,101
13,596
(2,428)11,168
5,664
High RiseMar 2005New York, NY190036
8,495
1,866
3,092
8,495
4,958
13,453
(2,770)10,683
5,553
240 West 73rd Street, LLCHigh RiseSep 2004New York, NY1900200
68,109
12,140
11,586
68,109
23,726
91,835
(9,215)82,620

High RiseSep 2004New York, NY1900200
68,109
12,140
11,905
68,109
24,045
92,154
(9,818)82,336

2900 on First ApartmentsMid RiseOct 2008Seattle, WA1989135
19,070
17,518
33,024
19,070
50,542
69,612
(21,502)48,110
14,218
Mid RiseOct 2008Seattle, WA1989135
19,070
17,518
33,542
19,070
51,060
70,130
(25,554)44,576
13,915
306 East 89th StreetHigh RiseJul 2004New York, NY193020
2,680
1,006
1,088
2,680
2,094
4,774
(734)4,040
1,891
High RiseJul 2004New York, NY193020
2,680
1,006
1,098
2,680
2,104
4,784
(888)3,896
1,854
311 & 313 East 73rd StreetMid RiseMar 2003New York, NY190434
5,678
1,609
417
5,678
2,026
7,704
(1,365)6,339
3,993
Mid RiseMar 2003New York, NY190434
5,678
1,609
520
5,678
2,129
7,807
(1,487)6,320
3,904
322-324 East 61st StreetHigh RiseMar 2005New York, NY190040
6,372
2,224
1,476
6,372
3,700
10,072
(1,618)8,454
3,478
High RiseMar 2005New York, NY190040
6,372
2,224
1,512
6,372
3,736
10,108
(1,830)8,278
3,410
3400 Avenue of the ArtsMid RiseMar 2002Costa Mesa, CA1987770
57,241
65,506
79,189
57,241
144,695
201,936
(84,070)117,866
148,926
Mid RiseMar 2002Costa Mesa, CA1987770
57,241
65,506
80,349
57,241
145,855
203,096
(86,923)116,173
145,752
452 East 78th StreetHigh RiseJan 2004New York, NY190012
1,982
608
539
1,982
1,147
3,129
(443)2,686
2,600
High RiseJan 2004New York, NY190012
1,982
608
548
1,982
1,156
3,138
(486)2,652
2,542
464-466 Amsterdam & 200-210 W. 83rd StreetMid RiseFeb 2007New York, NY191071
25,553
7,101
5,641
25,553
12,742
38,295
(5,569)32,726
20,933
Mid RiseFeb 2007New York, NY191071
25,553
7,101
6,070
25,553
13,171
38,724
(6,031)32,693
20,520
510 East 88th StreetHigh RiseJan 2004New York, NY190020
3,163
1,002
599
3,163
1,601
4,764
(567)4,197
2,785
High RiseJan 2004New York, NY190020
3,163
1,002
622
3,163
1,624
4,787
(642)4,145
2,724
514-516 East 88th StreetHigh RiseMar 2005New York, NY190036
6,282
2,168
1,319
6,282
3,487
9,769
(1,460)8,309
3,770
High RiseMar 2005New York, NY190036
6,282
2,168
1,593
6,282
3,761
10,043
(1,619)8,424
3,696
518 East 88th StreetMid-RiseJan 2014New York, NY190020
2,233
4,315
572
2,233
4,887
7,120
(868)6,252
2,855
Mid RiseJan 2014New York, NY190020
2,233
4,315
606
2,233
4,921
7,154
(1,137)6,017
2,792
707 LeahyGardenApr 2007Redwood City, CA1973110
15,444
7,909
6,581
15,444
14,490
29,934
(6,901)23,033
8,930
GardenApr 2007Redwood City, CA1973110
15,444
7,909
7,406
15,444
15,315
30,759
(6,964)23,795
8,737
777 South Broad StreetMid RiseMay 2018Philadelphia, PA2010146
6,986
67,512
829
6,986
68,341
75,327
(1,515)73,812
57,627
865 BellevueGardenJul 2000Nashville, TN1972326
3,562
12,037
22,966
3,562
35,003
38,565
(21,942)16,623
16,828
GardenJul 2000Nashville, TN1972326
3,562
12,037
23,538
3,562
35,575
39,137
(23,393)15,744

All HallowsGardenJan 2006San Francisco, CA1976157
1,338
29,770
21,530
1,338
51,300
52,638
(32,886)19,752
21,512
Axiom Apartment HomesMid RiseApr 2015Cambridge, MA2015115

63,612
2,006

65,618
65,618
(6,386)59,232
33,677
Avery RowMid RiseDec 2018Arlington, VA201367
8,140
21,348

8,140
21,348
29,488

29,488

AxiomMid RiseApr 2015Cambridge, MA2015115

63,612
2,444

66,056
66,056
(8,920)57,136
32,978
Bank LoftsHigh RiseApr 2001Denver, CO1920125
3,525
9,045
4,425
3,525
13,470
16,995
(6,845)10,150
10,722
High RiseApr 2001Denver, CO1920125
3,525
9,045
5,539
3,525
14,584
18,109
(7,463)10,646
10,476
Bay ParcHigh RiseSep 2004Miami, FL2000474
22,680
41,847
27,069
22,680
68,916
91,596
(18,431)73,165
43,045
Bay Parc PlazaHigh RiseSep 2004Miami, FL2000474
22,680
41,847
34,053
22,680
75,900
98,580
(22,485)76,095
42,434
Bay Ridge at NashuaGardenJan 2003Nashua, NH1984412
3,262
40,713
15,881
3,262
56,594
59,856
(22,065)37,791

GardenJan 2003Nashua, NH1984412
3,262
40,713
16,739
3,262
57,452
60,714
(22,738)37,976
51,450
Bayberry Hill EstatesGardenAug 2002Framingham, MA1971424
19,944
35,945
17,864
19,944
53,809
73,753
(24,945)48,808
30,710
GardenAug 2002Framingham, MA1971424
19,944
35,945
21,847
19,944
57,792
77,736
(27,629)50,107

BayviewGardenJun 2005San Francisco, CA1976146
582
15,265
18,447
582
33,712
34,294
(23,433)10,861
11,133
Bent Tree ApartmentsGardenFeb 2018Centreville, VA1986748
46,975
113,695
7,493
46,975
121,188
168,163
(4,331)163,832

Bluffs at Pacifica, TheGardenOct 2006Pacifica, CA196364
8,108
4,132
19,367
8,108
23,499
31,607
(11,739)19,868

GardenOct 2006Pacifica, CA196364
8,108
4,132
17,804
8,108
21,936
30,044
(10,996)19,048

Boston LoftsHigh RiseApr 2001Denver, CO1890-01-01158
3,446
20,589
5,257
3,446
25,846
29,292
(13,192)16,100
15,663
High RiseApr 2001Denver, CO1890158
3,446
20,589
5,694
3,446
26,283
29,729
(13,914)15,815
15,303
Boulder CreekGardenJul 1994Boulder, CO1973221
754
7,730
20,443
754
28,173
28,927
(18,728)10,199
4,289
GardenJul 1994Boulder, CO1973221
754
7,730
20,628
754
28,358
29,112
(19,702)9,410
38,500
Broadcast CenterGardenMar 2002Los Angeles, CA1990279
29,407
41,244
20,096
29,407
61,340
90,747
(28,704)62,043
55,920
GardenMar 2002Los Angeles, CA1990279
29,407
41,244
28,683
29,407
69,927
99,334
(29,655)69,679

Broadway LoftsHigh RiseSep 2012San Diego, CA190984
5,367
14,442
3,531
5,367
17,973
23,340
(3,516)19,824
11,755
High RiseSep 2012San Diego, CA190984
5,367
14,442
6,126
5,367
20,568
25,935
(4,604)21,331
11,531
Burke Shire CommonsGardenMar 2001Burke, VA1986360
4,867
23,617
16,505
4,867
40,122
44,989
(22,116)22,873
38,703
GardenMar 2001Burke, VA1986360
4,867
23,617
17,678
4,867
41,295
46,162
(24,737)21,425
57,860
Calhoun Beach ClubHigh RiseDec 1998Minneapolis, MN1928332
11,708
73,334
65,235
11,708
138,569
150,277
(75,654)74,623
43,292
Canyon TerraceGardenMar 2002Saugus, CA1984130
7,508
6,601
5,453
7,508
12,054
19,562
(7,037)12,525
9,285
Cedar RimGardenApr 2000Newcastle, WA1980104
761
5,218
11,587
761
16,805
17,566
(13,464)4,102
6,979
Charlesbank Apartment HomesMid RiseSep 2013Watertown, MA201244
3,399
11,726
702
3,399
12,428
15,827
(1,897)13,930
7,890
Chestnut HallHigh RiseOct 2006Philadelphia, PA1923315
12,338
14,299
9,990
12,338
24,289
36,627
(11,182)25,445
37,443

   (2)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2017 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)ApartmentDate  Year Apartment ��Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Chestnut Hill VillageGardenApr 2000Philadelphia, PA1963821
6,469
49,316
42,678
6,469
91,994
98,463
(56,047)42,416
73,566
Calhoun Beach ClubHigh RiseDec 1998Minneapolis, MN1928332
11,708
73,334
64,948
11,708
138,282
149,990
(79,547)70,443

Canyon TerraceGardenMar 2002Saugus, CA1984130
7,508
6,601
6,525
7,508
13,126
20,634
(6,960)13,674

Cedar RimGardenApr 2000Newcastle, WA1980104
761
5,218
13,032
761
18,250
19,011
(13,153)5,858

Charlesbank Apartment HomesMid RiseSep 2013Watertown, MA201244
3,399
11,726
821
3,399
12,547
15,946
(2,404)13,542
7,718
Chestnut HallHigh RiseOct 2006Philadelphia, PA1923315
12,338
14,299
12,074
12,338
26,373
38,711
(12,144)26,567
36,653
Chimneys of Cradle RockGardenJun 2004Columbia, MD1979198
2,040
8,108
1,005
2,040
9,113
11,153
(3,814)7,339
15,021
GardenJun 2004Columbia, MD1979198
2,040
8,108
1,116
2,040
9,224
11,264
(4,206)7,058

Columbus AvenueMid RiseSep 2003New York, NY1880-01-0159
35,527
9,450
8,604
35,527
18,054
53,581
(9,266)44,315
25,778
Mid RiseSep 2003New York, NY188059
35,527
9,450
9,117
35,527
18,567
54,094
(10,600)43,494
25,205
CreeksideGardenJan 2000Denver, CO1974328
3,189
12,698
6,879
3,189
19,577
22,766
(12,738)10,028
11,570
GardenJan 2000Denver, CO1974328
3,189
12,698
7,450
3,189
20,148
23,337
(13,072)10,265
11,325
Crescent at West Hollywood, TheMid RiseMar 2002West Hollywood, CA1985130
15,765
10,215
9,096
15,765
19,311
35,076
(12,693)22,383

Mid RiseMar 2002West Hollywood, CA1985130
15,765
10,215
8,411
15,765
18,626
34,391
(12,166)22,225
40,000
Elm CreekMid RiseDec 1997Elmhurst, IL1987400
8,987
30,878
31,161
8,987
62,039
71,026
(30,121)40,905
52,349
Mid RiseDec 1997Elmhurst, IL1987400
5,910
30,830
31,950
5,910
62,780
68,690
(32,993)35,697
51,341
Evanston PlaceHigh RiseDec 1997Evanston, IL1990190
3,232
25,546
13,094
3,232
38,640
41,872
(17,535)24,337

High RiseDec 1997Evanston, IL1990190
3,232
25,546
16,214
3,232
41,760
44,992
(19,152)25,840

FarmingdaleMid RiseOct 2000Darien, IL1975240
11,763
15,174
9,514
11,763
24,688
36,451
(12,231)24,220
13,774
Mid RiseOct 2000Darien, IL1975240
11,763
15,174
11,173
11,763
26,347
38,110
(13,618)24,492
13,106
Flamingo TowersHigh RiseSep 1997Miami Beach, FL19601,305
32,427
48,808
317,464
32,427
366,272
398,699
(160,620)238,079
105,371
High RiseSep 1997Miami Beach, FL19601,324
32,427
48,808
339,187
32,427
387,995
420,422
(174,249)246,173
103,152
Four Quarters HabitatGardenJan 2006Miami, FL1976336
2,379
17,199
27,711
2,379
44,910
47,289
(24,508)22,781
4,624
GardenJan 2006Miami, FL1976336
2,379
17,199
30,286
2,379
47,485
49,864
(27,112)22,752
51,603
FoxchaseGardenDec 1997Alexandria, VA19402,113
15,496
96,062
43,269
15,496
139,331
154,827
(79,714)75,113
228,636
GardenDec 1997Alexandria, VA19402,113
15,496
96,062
52,254
15,496
148,316
163,812
(85,298)78,514
223,626
GeorgetownGardenAug 2002Framingham, MA1964207
12,351
13,168
3,280
12,351
16,448
28,799
(7,575)21,224

GardenAug 2002Framingham, MA1964207
12,351
13,168
3,996
12,351
17,164
29,515
(8,281)21,234
14,697
Georgetown IIMid RiseAug 2002Framingham, MA195872
4,577
4,057
1,642
4,577
5,699
10,276
(3,128)7,148

Mid RiseAug 2002Framingham, MA195872
4,577
4,057
2,118
4,577
6,175
10,752
(3,483)7,269

Heritage Park EscondidoGardenOct 2000Escondido, CA1986196
1,055
7,565
2,284
1,055
9,849
10,904
(6,589)4,315
6,377
GardenOct 2000Escondido, CA1986196
1,055
7,565
2,572
1,055
10,137
11,192
(6,993)4,199
6,129
Heritage Park LivermoreGardenOct 2000Livermore, CA1988167

10,209
1,889

12,098
12,098
(7,854)4,244
6,603
GardenOct 2000Livermore, CA1988167

10,209
1,850

12,059
12,059
(8,176)3,883
6,353
Heritage Village AnaheimGardenOct 2000Anaheim, CA1986196
1,832
8,541
1,985
1,832
10,526
12,358
(6,665)5,693
7,741
GardenOct 2000Anaheim, CA1986196
1,832
8,541
2,084
1,832
10,625
12,457
(6,999)5,458
7,441
Hidden CoveGardenJul 1998Escondido, CA1983334
3,043
17,616
10,386
3,043
28,002
31,045
(15,425)15,620
33,765
GardenJul 1998Escondido, CA1983334
3,043
17,616
10,802
3,043
28,418
31,461
(16,205)15,256
51,840
Hidden Cove IIGardenJul 2007Escondido, CA1986118
12,849
6,530
5,093
12,849
11,623
24,472
(5,362)19,110
13,684
GardenJul 2007Escondido, CA1986118
12,849
6,530
5,260
12,849
11,790
24,639
(5,263)19,376
20,160
HillcresteGardenMar 2002Century City, CA1989315
35,862
47,216
12,220
35,862
59,436
95,298
(26,131)69,167
64,958
GardenMar 2002Century City, CA1989315
35,862
47,216
13,194
35,862
60,410
96,272
(27,374)68,898
63,479
HillmeadeGardenNov 1994Nashville, TN1986288
2,872
16,070
19,270
2,872
35,340
38,212
(19,327)18,885
27,866
GardenNov 1994Nashville, TN1986288
2,872
16,070
20,200
2,872
36,270
39,142
(21,006)18,136
27,321
Horizons West ApartmentsMid RiseDec 2006Pacifica, CA197078
8,887
6,377
2,298
8,887
8,675
17,562
(4,167)13,395
14,046
Mid RiseDec 2006Pacifica, CA197078
8,887
6,377
1,634
8,887
8,011
16,898
(3,689)13,209

Hunt ClubGardenSep 2000Gaithersburg, MD1986336
17,859
13,149
13,136
17,859
26,285
44,144
(14,636)29,508

GardenSep 2000Gaithersburg, MD1986336
17,859
13,149
14,154
17,859
27,303
45,162
(16,083)29,079

Hyde Park TowerHigh RiseOct 2004Chicago, IL1990155
4,731
14,927
11,493
4,731
26,420
31,151
(7,939)23,212
12,926
High RiseOct 2004Chicago, IL1990155
4,731
14,927
12,334
4,731
27,261
31,992
(9,569)22,423
12,620
Indian OaksGardenMar 2002Simi Valley, CA1986254
24,523
15,801
8,551
24,523
24,352
48,875
(11,896)36,979
28,163
GardenMar 2002Simi Valley, CA1986254
24,523
15,801
11,246
24,523
27,047
51,570
(13,180)38,390
27,596
IndigoHigh RiseAug 2016Redwood City, CA2016463
26,932
296,116
878
26,932
296,994
323,926
(14,249)309,677
141,411
High RiseAug 2016Redwood City, CA2016463
26,932
296,116
1,771
26,932
297,887
324,819
(24,707)300,112
138,430
Island ClubGardenOct 2000Oceanside, CA1986592
18,027
28,654
15,611
18,027
44,265
62,292
(28,228)34,064
56,392
GardenOct 2000Oceanside, CA1986592
18,027
28,654
18,740
18,027
47,394
65,421
(30,320)35,101
94,967
Key TowersHigh RiseApr 2001Alexandria, VA1964140
1,526
7,050
7,355
1,526
14,405
15,931
(11,077)4,854

High RiseApr 2001Alexandria, VA1964140
1,526
7,050
7,781
1,526
14,831
16,357
(11,892)4,465

LakesideGardenOct 1999Lisle, IL1972568
5,840
27,937
22,369
5,840
50,306
56,146
(32,466)23,680
25,709
GardenOct 1999Lisle, IL1972568
5,840
27,937
22,408
5,840
50,345
56,185
(33,582)22,603
25,090
La SalleGardenOct 2000San Francisco, CA1976145
1,866
19,567
19,145
1,866
38,712
40,578
(28,312)12,266
17,052
LatrobeHigh RiseJan 2003Washington, DC1980175
3,459
9,103
13,498
3,459
22,601
26,060
(12,042)14,018
27,356
High RiseJan 2003Washington, DC1980175
3,459
9,103
12,715
3,459
21,818
25,277
(11,916)13,361
26,758
Laurel CrossingGardenJan 2006San Mateo, CA1971418
49,474
17,756
14,730
49,474
32,486
81,960
(16,074)65,886
72,788
GardenJan 2006San Mateo, CA1971418
49,474
17,756
14,166
49,474
31,922
81,396
(15,757)65,639

Lincoln Place (5)GardenOct 2004Venice, CA1951795
128,332
10,439
334,559
44,197
344,998
389,195
(95,770)293,425
191,039
GardenOct 2004Venice, CA1951795
128,332
10,439
337,267
44,197
347,706
391,903
(121,677)270,226
187,723
Locust on the ParkHigh RiseMay 2018Philadelphia, PA1911152
5,292
53,823
2,474
5,292
56,297
61,589
(1,183)60,406
35,728
Lodge at Chattahoochee, TheGardenOct 1999Sandy Springs, GA1970312
2,335
16,370
16,477
2,335
32,847
35,182
(21,310)13,872
19,775
GardenOct 1999Sandy Springs, GA1970312
2,335
16,370
16,809
2,335
33,179
35,514
(22,375)13,139

Malibu CanyonGardenMar 2002Calabasas, CA1986698
69,834
53,438
32,597
69,834
86,035
155,869
(41,216)114,653
107,643
GardenMar 2002Calabasas, CA1986698
69,834
53,438
37,919
69,834
91,357
161,191
(45,222)115,969
105,367
Maple BayGardenDec 1999Virginia Beach, VA1971414
2,597
16,141
18,032
2,597
34,173
36,770
(22,497)14,273

Mariner's CoveGardenMar 2002San Diego, CA1984500

66,861
9,980

76,841
76,841
(36,154)40,687

Mariners CoveGardenMar 2002San Diego, CA1984500

66,861
13,317

80,178
80,178
(39,035)41,143

Meadow CreekGardenJul 1994Boulder, CO1968332
1,435
24,533
8,739
1,435
33,272
34,707
(17,699)17,008
41,229
GardenJul 1994Boulder, CO1968332
1,435
24,533
9,602
1,435
34,135
35,570
(19,285)16,285

Merrill HouseHigh RiseJan 2000Falls Church, VA1964159
1,836
10,831
8,031
1,836
18,862
20,698
(10,460)10,238

High RiseJan 2000Falls Church, VA1964159
1,836
10,831
7,657
1,836
18,488
20,324
(10,492)9,832

MezzoHigh RiseMar 2015Atlanta, GA200894
4,292
34,178
1,039
4,292
35,217
39,509
(4,115)35,394
24,002
High RiseMar 2015Atlanta, GA200894
4,292
34,178
1,250
4,292
35,428
39,720
(5,484)34,236
23,496
Monterey GroveGardenJun 2008San Jose, CA1999224
34,325
21,939
7,585
34,325
29,524
63,849
(11,678)52,171

GardenJun 2008San Jose, CA1999224
34,325
21,939
8,674
34,325
30,613
64,938
(12,039)52,899

Ocean House on ProspectMid RiseApr 2013La Jolla, CA197053
12,528
18,805
14,936
12,528
33,741
46,269
(4,584)41,685
13,191
Mid RiseApr 2013La Jolla, CA197053
12,528
18,805
15,089
12,528
33,894
46,422
(6,592)39,830
12,745
One CanalHigh RiseSep 2013Boston, MA2016310

15,873
178,996

194,869
194,869
(12,378)182,491
112,037
High RiseSep 2013Boston, MA2016310

15,873
179,912

195,785
195,785
(20,623)175,162
110,310
Pacific Bay Vistas (5)GardenMar 2001San Bruno, CA1987308
28,694
62,460
37,025
23,354
99,485
122,839
(28,511)94,328
68,704
GardenMar 2001San Bruno, CA1987308
28,694
62,460
39,067
23,354
101,527
124,881
(35,131)89,750
67,826
Pacifica ParkGardenJul 2006Pacifica, CA1977104
12,970
6,579
7,766
12,970
14,345
27,315
(5,667)21,648
11,195
GardenJul 2006Pacifica, CA1977104
12,970
6,579
7,879
12,970
14,458
27,428
(6,565)20,863
28,613
Palazzo at Park La Brea, TheMid RiseFeb 2004Los Angeles, CA2002521
48,362
125,464
40,851
48,362
166,315
214,677
(72,351)142,326
170,000
Palazzo East at Park La Brea, TheMid RiseMar 2005Los Angeles, CA2005611
72,578
136,503
16,160
72,578
152,663
225,241
(66,415)158,826
111,494
Parc MosaicGardenDec 2014Boulder, CO1970140
15,300

11,748
15,300
11,748
27,048

27,048

Park Towne PlaceHigh RiseApr 2000Philadelphia, PA1959942
10,472
47,301
303,898
10,472
351,199
361,671
(91,256)270,415


   (2)    (2) 
 (1)   Initial Cost Cost CapitalizedDecember 31, 2017 (1)   Initial Cost Cost CapitalizedDecember 31, 2018
ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD EncumbrancesTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
      
Palazzo at Park La Brea, TheMid RiseFeb 2004Los Angeles, CA2002521
48,362
125,464
45,176
48,362
170,640
219,002
(80,075)138,927
168,654
Palazzo East at Park La Brea, TheMid RiseMar 2005Los Angeles, CA2005611
72,578
136,503
19,328
72,578
155,831
228,409
(72,709)155,700
196,109
Parc MosaicGardenDec 2014Boulder, CO1970226
15,300

53,638
15,300
53,638
68,938

68,938

Park Towne PlaceHigh RiseApr 2000Philadelphia, PA1959940
10,472
47,301
345,748
10,472
393,049
403,521
(119,350)284,171
200,000
Pathfinder VillageGardenJan 2006Fremont, CA1973246
19,595
14,838
14,497
19,595
29,335
48,930
(12,384)36,546
38,136
GardenJan 2006Fremont, CA1973246
19,595
14,838
18,457
19,595
33,295
52,890
(14,518)38,372
55,000
Peachtree ParkGardenJan 1996Atlanta, GA1969303
4,684
11,713
13,347
4,684
25,060
29,744
(15,621)14,123
1,337
GardenJan 1996Atlanta, GA1969303
4,684
11,713
14,045
4,684
25,758
30,442
(16,449)13,993
27,800
Plantation GardensGardenOct 1999Plantation, FL1971372
3,773
19,443
24,563
3,773
44,006
47,779
(25,406)22,373

GardenOct 1999Plantation, FL1971372
3,773
19,443
25,655
3,773
45,098
48,871
(27,273)21,598

Post RidgeGardenJul 2000Nashville, TN1972150
1,883
6,712
5,120
1,883
11,832
13,715
(7,856)5,859
5,218
GardenJul 2000Nashville, TN1972150
1,883
6,712
4,537
1,883
11,249
13,132
(7,401)5,731

Preserve at MarinMid RiseAug 2011Corte Madera, CA1964126
18,179
30,132
83,631
18,179
113,763
131,942
(19,787)112,155
37,034
Mid RiseAug 2011Corte Madera, CA1964126
18,179
30,132
84,629
18,179
114,761
132,940
(26,039)106,901
36,260
Ravensworth TowersHigh RiseJun 2004Annandale, VA1974219
3,455
17,157
3,639
3,455
20,796
24,251
(13,849)10,402
20,789
High RiseJun 2004Annandale, VA1974219
3,455
17,157
4,490
3,455
21,647
25,102
(14,617)10,485
20,342
River Club,TheGardenApr 2005Edgewater, NJ1998266
30,579
30,638
6,689
30,579
37,327
67,906
(15,673)52,233

GardenApr 2005Edgewater, NJ1998266
30,579
30,638
7,475
30,579
38,113
68,692
(17,293)51,399
60,000
RiverloftHigh RiseOct 1999Philadelphia, PA1910184
2,120
11,286
30,432
2,120
41,718
43,838
(21,471)22,367
9,378
High RiseOct 1999Philadelphia, PA1910184
2,120
11,286
35,086
2,120
46,372
48,492
(23,386)25,106
7,680
RosewoodGardenMar 2002Camarillo, CA1976152
12,430
8,060
4,081
12,430
12,141
24,571
(6,385)18,186
16,095
GardenMar 2002Camarillo, CA1976152
12,430
8,060
5,754
12,430
13,814
26,244
(6,984)19,260

Royal Crest EstatesGardenAug 2002Warwick, RI1972492
22,433
24,095
4,309
22,433
28,404
50,837
(18,569)32,268

GardenAug 2002Warwick, RI1972492
22,433
24,095
5,512
22,433
29,607
52,040
(20,050)31,990

Royal Crest EstatesGardenAug 2002Nashua, NH1970902
68,230
45,562
13,521
68,230
59,083
127,313
(38,506)88,807

GardenAug 2002Nashua, NH1970902
68,230
45,562
15,751
68,230
61,313
129,543
(41,440)88,103
71,957
Royal Crest EstatesGardenAug 2002Marlborough, MA1970473
25,178
28,786
11,388
25,178
40,174
65,352
(24,315)41,037
30,841
GardenAug 2002Marlborough, MA1970473
25,178
28,786
13,490
25,178
42,276
67,454
(26,610)40,844

Royal Crest EstatesGardenAug 2002North Andover, MA1970588
51,292
36,808
24,271
51,292
61,079
112,371
(32,966)79,405
42,110
GardenAug 2002North Andover, MA1970588
51,292
36,808
27,916
51,292
64,724
116,016
(36,132)79,884

Savannah TraceGardenMar 2001Shaumburg, IL1986368
13,960
20,731
11,147
13,960
31,878
45,838
(15,939)29,899
23,202
Saybrook PointeGardenDec 2014San Jose, CA1995324
32,842
84,457
19,633
32,842
104,090
136,932
(9,681)127,251
63,540
ShoreviewGardenOct 1999San Francisco, CA1976156
1,476
19,071
20,752
1,476
39,823
41,299
(30,085)11,214
18,461
Saybrook PointGardenDec 2014San Jose, CA1995324
32,842
84,457
25,729
32,842
110,186
143,028
(14,179)128,849
62,329
Shenandoah CrossingGardenSep 2000Fairfax, VA1984640
18,200
57,198
24,350
18,200
81,548
99,748
(53,306)46,442
59,748
GardenSep 2000Fairfax, VA1984640
18,200
57,198
25,345
18,200
82,543
100,743
(58,302)42,441
58,565
SouthStar LoftsHigh RiseMay 2018Philadelphia, PA201485
1,780
37,428
402
1,780
37,830
39,610
(836)38,774
30,197
Springwoods at Lake RidgeGardenJul 2002Woodbridge, VA1984180
5,587
7,284
3,069
5,587
10,353
15,940
(4,160)11,780

GardenJul 2002Woodbridge, VA1984180
5,587
7,284
3,642
5,587
10,926
16,513
(4,606)11,907

St. George VillasGardenJan 2006St. George, SC198440
107
1,025
400
107
1,425
1,532
(1,218)314
336
GardenJan 2006St. George, SC198440
107
1,025
410
107
1,435
1,542
(1,256)286
314
Sterling Apartment Homes, TheGardenOct 1999Philadelphia, PA1961534
8,871
55,365
117,562
8,871
172,927
181,798
(70,455)111,343
146,650
GardenOct 1999Philadelphia, PA1961534
8,871
55,365
120,426
8,871
175,791
184,662
(82,367)102,295
144,030
Stone Creek ClubGardenSep 2000Germantown, MD1984240
13,593
9,347
7,230
13,593
16,577
30,170
(11,902)18,268

GardenSep 2000Germantown, MD1984240
13,593
9,347
8,078
13,593
17,425
31,018
(12,553)18,465

The Left BankMid RiseMay 2018Philadelphia, PA1929282

130,893
3,053

133,946
133,946
(2,879)131,067
82,532
Timbers at Long Reach Apartment HomesGardenApr 2005Columbia, MD1979178
2,430
12,181
1,283
2,430
13,464
15,894
(7,340)8,554
12,405
GardenApr 2005Columbia, MD1979178
2,430
12,181
1,705
2,430
13,886
16,316
(8,182)8,134

Towers Of Westchester Park, TheHigh RiseJan 2006College Park, MD1972303
15,198
22,029
12,858
15,198
34,887
50,085
(16,965)33,120
23,836
High RiseJan 2006College Park, MD1972303
15,198
22,029
13,936
15,198
35,965
51,163
(18,825)32,338
23,232
Township At HighlandsTown HomeNov 1996Centennial, CO1985161
1,536
9,773
8,471
1,536
18,244
19,780
(11,272)8,508
13,965
Town HomeNov 1996Centennial, CO1985161
1,536
9,773
9,280
1,536
19,053
20,589
(12,181)8,408
13,557
TremontMid RiseDec 2014Atlanta, GA200978
5,274
18,011
2,335
5,274
20,346
25,620
(2,258)23,362

Mid RiseDec 2014Atlanta, GA200978
5,274
18,011
2,746
5,274
20,757
26,031
(3,110)22,921

Twin Lake TowersHigh RiseOct 1999Westmont, IL1969399
3,268
18,763
36,186
3,268
54,949
58,217
(40,894)17,323
29,851
High RiseOct 1999Westmont, IL1969399
3,268
18,763
37,904
3,268
56,667
59,935
(43,106)16,829
44,906
Vantage PointeMid RiseAug 2002Swampscott, MA198796
4,748
10,089
1,663
4,748
11,752
16,500
(4,853)11,647
3,385
Mid RiseAug 2002Swampscott, MA198796
4,748
10,089
2,314
4,748
12,403
17,151
(5,294)11,857
2,746
Villa Del SolGardenMar 2002Norwalk, CA1972120
7,476
4,861
4,040
7,476
8,901
16,377
(4,628)11,749
10,813
GardenMar 2002Norwalk, CA1972120
7,476
4,861
4,553
7,476
9,414
16,890
(5,216)11,674
10,582
Villas at Park La Brea, TheGardenMar 2002Los Angeles, CA2002250
8,630
48,871
7,116
8,630
55,987
64,617
(27,703)36,914
14,477
GardenMar 2002Los Angeles, CA2002250
8,630
48,871
16,008
8,630
64,879
73,509
(30,510)42,999
53,868
Villas of PasadenaMid RiseJan 2006Pasadena, CA197392
9,693
6,818
3,963
9,693
10,781
20,474
(3,740)16,734
9,299
Mid RiseJan 2006Pasadena, CA197392
9,693
6,818
4,493
9,693
11,311
21,004
(4,397)16,607

VivoHigh RiseJun 2015Cambridge, MA201591
6,450
35,974
5,089
6,450
41,063
47,513
(5,853)41,660
20,796
High RiseJun 2016Cambridge, MA201591
6,450
35,974
5,590
6,450
41,564
48,014
(8,694)39,320
20,310
Waterford VillageGardenAug 2002Bridgewater, MA1971588
29,110
28,101
5,644
29,110
33,745
62,855
(24,149)38,706
36,024
GardenAug 2002Bridgewater, MA1971588
29,110
28,101
8,222
29,110
36,323
65,433
(26,540)38,893
35,269
Waterways VillageGardenJun 1997Aventura, FL1994180
4,504
11,064
13,340
4,504
24,404
28,908
(10,804)18,104
13,456
GardenJun 1997Aventura, FL1994180
4,504
11,064
15,205
4,504
26,269
30,773
(12,394)18,379
13,168
Waverly ApartmentsGardenAug 2008Brighton, MA1970103
7,920
11,347
5,912
7,920
17,259
25,179
(5,740)19,439
11,770
GardenAug 2008Brighton, MA1970103
7,920
11,347
6,299
7,920
17,646
25,566
(6,323)19,243
11,515
Wexford VillageGardenAug 2002Worcester, MA1974264
6,349
17,939
2,595
6,349
20,534
26,883
(11,885)14,998

GardenAug 2002Worcester, MA1974264
6,349
17,939
4,245
6,349
22,184
28,533
(12,980)15,553

Willow BendGardenMay 1998Rolling Meadows, IL1969328
2,717
15,437
22,524
2,717
37,961
40,678
(26,029)14,649
33,838
GardenMay 1998Rolling Meadows, IL1969328
2,717
15,437
19,609
2,717
35,046
37,763
(23,492)14,271
33,175
WindriftGardenMar 2001Oceanside, CA1987404
24,960
17,590
19,948
24,960
37,538
62,498
(21,906)40,592
39,408
GardenMar 2001Oceanside, CA1987404
24,960
17,590
21,487
24,960
39,077
64,037
(23,762)40,275

Windsor ParkGardenMar 2001Woodbridge, VA1987220
4,279
15,970
5,686
4,279
21,656
25,935
(12,356)13,579
17,338
GardenMar 2001Woodbridge, VA1987220
4,279
15,970
6,217
4,279
22,187
26,466
(13,378)13,088

Yacht Club at BrickellHigh RiseDec 2003Miami, FL1998357
31,362
32,214
13,762
31,362
45,976
77,338
(15,954)61,384
45,303
High RiseDec 2003Miami, FL1998357
31,362
32,214
16,715
31,362
48,929
80,291
(17,513)62,778
44,219
Yorktown ApartmentsHigh RiseDec 1999Lombard, IL1971364
3,055
18,162
50,494
3,055
68,656
71,711
(23,943)47,768
29,010
High RiseDec 1999Lombard, IL1971364
3,055
18,162
52,436
3,055
70,598
73,653
(29,697)43,956
38,280
Other (6) 
75,903
10,474
7,948
40,022
18,422
58,444
(6,675)51,769

 
5,135

20,914
5,135
20,914
26,049

26,049

Total Real Estate SegmentTotal Real Estate Segment 36,249
1,878,960
3,249,698
2,924,451
1,753,604
6,174,149
7,927,753
(2,522,358)5,405,395
3,563,041
Total Real Estate Segment 35,625
1,846,000
3,494,014
3,058,051
1,756,525
6,552,065
8,308,590
(2,585,115)5,723,475
3,937,000
  
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
Asset Management Business:   
Arvada HouseHigh RiseNov 2004Arvada, CO197788
405
3,314
2,475
405
5,789
6,194
(3,174)3,020
3,806
Beacon HillHigh RiseMar 2002Hillsdale, MI1980198
1,094
7,044
6,271
1,094
13,315
14,409
(7,607)6,802
6,512
Biltmore TowersHigh RiseMar 2002Dayton, OH1980230
1,814
6,411
13,688
1,814
20,099
21,913
(14,027)7,886
9,863
Butternut CreekMid RiseJan 2006Charlotte, MI1980100
505
3,617
4,163
505
7,780
8,285
(6,461)1,824
4,042

       (2)      
  (1)    Initial Cost Cost CapitalizedDecember 31, 2017
 ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
               
Carriage HouseMid RiseDec 2006Petersburg, VA1885-01-01118
716
2,886
4,173
716
7,059
7,775
(4,390)3,385
1,767
Copperwood Apartments IGardenApr 2006The Woodlands, TX1980150
383
8,373
6,182
383
14,555
14,938
(12,789)2,149
4,969
Copperwood Apartments IIGardenOct 2005The Woodlands, TX1981150
459
5,553
3,890
459
9,443
9,902
(6,160)3,742
5,126
Country Club HeightsGardenMar 2004Quincy, IL1976200
676
5,715
5,444
676
11,159
11,835
(6,957)4,878
5,252
Crevenna OaksTown HomeJan 2006Burke, VA197950

5,203
616

5,819
5,819
(3,686)2,133
2,136
Fountain PlaceMid RiseJan 2006Connersville, IN1980102
378
2,091
3,427
378
5,518
5,896
(2,725)3,171
816
Hopkins VillageMid RiseSep 2003Baltimore, MD1979165
549
5,973
3,527
549
9,500
10,049
(4,799)5,250
9,100
Ingram SquareGardenJan 2006San Antonio, TX1980120
800
3,136
6,057
800
9,193
9,993
(6,468)3,525
2,980
Kirkwood HouseHigh RiseSep 2004Baltimore, MD1979261
1,337
9,358
9,572
1,337
18,930
20,267
(10,453)9,814
16,000
La VistaGardenJan 2006Concord, CA198175
581
4,449
4,835
581
9,284
9,865
(4,793)5,072
4,723
Loring TowersHigh RiseOct 2002Minneapolis, MN1975230
886
7,445
9,213
886
16,658
17,544
(9,269)8,275
9,225
Loring Towers ApartmentsHigh RiseSep 2003Salem, MA1973250
187
14,050
8,738
187
22,788
22,975
(12,437)10,538
9,622
New BaltimoreMid RiseMar 2002New Baltimore, MI1980101
896
2,360
5,404
896
7,764
8,660
(4,999)3,661
1,887
NorthpointGardenJan 2000Chicago, IL1921304
2,510
14,334
16,358
2,510
30,692
33,202
(23,479)9,723
17,170
Panorama ParkGardenMar 2002Bakersfield, CA198266
521
5,520
1,324
521
6,844
7,365
(4,299)3,066
1,558
Park PlaceMid RiseJun 2005St Louis, MO1977242
705
6,327
8,557
705
14,884
15,589
(11,702)3,887
8,065
Parkways, TheGardenJun 2004Chicago, IL1925446
3,426
23,257
23,186
3,426
46,443
49,869
(29,364)20,505
14,892
Pleasant HillsGardenApr 2005Austin, TX1982100
1,229
2,631
4,322
1,229
6,953
8,182
(4,581)3,601
2,841
Plummer VillageMid RiseMar 2002North Hills, CA198375
666
2,647
1,394
666
4,041
4,707
(3,069)1,638
2,226
RiverwoodsHigh RiseJan 2006Kankakee, IL1983125
598
4,931
3,834
598
8,765
9,363
(4,467)4,896
3,412
Round Barn ManorGardenMar 2002Champaign, IL1979156
810
5,134
6,086
810
11,220
12,030
(5,222)6,808
3,774
San Jose ApartmentsGardenSep 2005San Antonio, TX1970220
234
5,770
12,543
234
18,313
18,547
(11,656)6,891
4,154
San Juan Del CentroMid RiseSep 2005Boulder, CO1971150
439
7,110
12,694
439
19,804
20,243
(12,108)8,135
11,389
South Bay VillaGardenMar 2002Los Angeles, CA198180
1,352
2,770
3,944
1,352
6,714
8,066
(5,716)2,350
2,622
Summit OaksTown HomeJan 2006Burke, VA198050

5,311
631

5,942
5,942
(3,571)2,371
2,113
Tamarac Pines Apartments IGardenNov 2004Woodlands, TX1980144
363
2,775
3,828
363
6,603
6,966
(4,287)2,679
3,483
Tamarac Pines Apartments IIGardenNov 2004Woodlands, TX1980156
266
3,195
4,363
266
7,558
7,824
(4,863)2,961
3,774
Terry ManorMid RiseOct 2005Los Angeles, CA1977170
1,997
5,848
5,441
1,997
11,289
13,286
(9,346)3,940
5,960
Tompkins TerraceGardenOct 2002Beacon, NY1974193
872
6,827
14,918
872
21,745
22,617
(12,629)9,988
6,318
Van Nuys ApartmentsHigh RiseMar 2002Los Angeles, CA1981299
3,576
21,226
23,955
3,576
45,181
48,757
(23,501)25,256
23,531
Walnut HillsHigh RiseJan 2006Cincinnati, OH1983198
820
5,608
6,000
820
11,608
12,428
(6,847)5,581
4,799
Washington Square WestMid RiseSep 2004Philadelphia, PA1982132
582
11,169
5,479
582
16,648
17,230
(12,146)5,084
3,298
Whitefield PlaceGardenApr 2005San Antonio, TX198080
219
3,151
2,445
219
5,596
5,815
(3,681)2,134
1,932
Winter GardensHigh RiseMar 2004St Louis, MO1920112
300
3,072
4,973
300
8,045
8,345
(3,261)5,084
3,132
Woodland HillsGardenOct 2005Jackson, MI1980125
320
3,875
4,237
320
8,112
8,432
(5,262)3,170
3,105
Total Asset Management Business   6,211
33,471
249,466
268,187
33,471
517,653
551,124
(326,251)224,873
231,374
Total    42,460
$1,912,431
$3,499,164
$3,192,638
$1,787,075
$6,691,802
$8,478,877
$(2,848,609)$5,630,268
$3,794,415
               
(1) Date we acquired the apartment community or first consolidated the partnership that owns the apartment community.
(2) Includes costs capitalized since acquisition or date of initial consolidation of the partnership/apartment community.
(3) The aggregate cost of land and depreciable property for federal income tax purposes was approximately $3.7 billion at December 31, 2017.
(4) Encumbrances are presented before reduction for debt issuance costs.
(5) The current carrying value of the apartment community reflects an impairment loss recognized during prior periods.
(6) Other includes land parcels and certain non-residential properties held for future development. The current carrying value of land reflects an impairment loss recognized during the current period.
      
 
 
 
 
 
 
 
 
 
      
 
 
 
 
 
 
 
 
 
       (2)      
  (1)    Initial Cost Cost CapitalizedDecember 31, 2018
 ApartmentDate  Year Apartment  Buildings and Subsequent to  Buildings and(3) Accumulated Total Cost(4)
Apartment Community NameTypeConsolidatedLocation Built Homes Land Improvements Consolidation Land Improvements Total Depreciation (AD) Net of AD Encumbrances
               
               
(1) Date we acquired the apartment community or first consolidated the partnership that owns the apartment community.
(2) Includes costs capitalized since acquisition or date of initial consolidation of the partnership/apartment community.
(3) The aggregate cost of land and depreciable property for federal income tax purposes was approximately $4.0 billion at December 31, 2018.
(4) Encumbrances are presented before reduction for debt issuance costs.
(5) The current carrying value of the apartment community reflects an impairment loss recognized during prior periods.
(6) Other includes land parcels and certain non-residential properties held for future development.
     



















     




















APARTMENT INVESTMENT AND MANAGEMENT COMPANY
AIMCO PROPERTIES, L.P.
SCHEDULE III: REAL ESTATE AND ACCUMULATED DEPRECIATION
For the Years Ended December 31, 2018, 2017 2016 and 20152016
(In Thousands)

2017 2016 20152018 2017 2016
Real Estate Segment          
Real Estate balance at beginning of year$7,931,117
 $7,744,894
 $7,577,031
$7,927,753
 $7,931,117
 $7,744,894
Additions during the year:          
Acquisitions16,687
 333,174
 147,077
501,009
 16,687
 333,174
Capital additions345,974
 329,697
 355,569
344,501
 345,974
 329,697
Deductions during the year:          
Casualty and other write-offs (1)(106,590) (170,744) (66,844)(58,152) (106,590) (170,744)
Impairment of real estate(35,881) 
 

 (35,881) 
Amounts related to assets held for sale(38,208) 
 (7,036)(83,905) (38,208) 
Sales(185,346) (305,904) (260,903)(322,616) (185,346) (305,904)
Real Estate balance at end of year$7,927,753
 $7,931,117
 $7,744,894
$8,308,590
 $7,927,753
 $7,931,117
          
Accumulated Depreciation balance at beginning of year$2,421,357
 $2,488,448
 $2,393,292
$2,522,358
 $2,421,357
 $2,488,448
Additions during the year:          
Depreciation320,870
 287,661
 262,235
339,883
 320,870
 287,661
Deductions during the year:          
Casualty and other write-offs (1)(106,521) (169,098) (66,246)(57,067) (106,521) (169,098)
Amounts related to assets held for sale(20,383) 
 (4,427)(41,717) (20,383) 
Sales(92,965) (185,654) (96,406)(178,342) (92,965) (185,654)
Accumulated depreciation balance at end of year$2,522,358
 $2,421,357
 $2,488,448
$2,585,115
 $2,522,358
 $2,421,357
          
Asset Management Business          
Real Estate balance at beginning of year$555,049
 $562,589
 $567,927
$551,124
 $555,049
 $562,589
Additions during the year:          
Capital additions8,255
 8,909
 7,379
4,226
 8,255
 8,909
Deductions during the year:          
Casualty and other write-offs (2)(1,711) (2,116) (12,717)6,603
 (1,711) (2,116)
Amounts related to assets held for sale
 (2,801) 

 
 (2,801)
Sales(10,469) (11,532) 
(561,953) (10,469) (11,532)
Real Estate balance at end of year$551,124
 $555,049
 $562,589
$
 $551,124
 $555,049
          
Accumulated Depreciation balance at beginning of year$309,401
 $289,574
 $278,887
$326,251
 $309,401
 $289,574
Additions during the year:          
Depreciation24,090
 24,704
 23,279
14,325
 24,090
 24,704
Deductions during the year:          
Casualty and other write-offs (2)(2,480) (68) (12,592)6,704
 (2,480) (68)
Amounts related to assets held for sale
 (1,525) 

 
 (1,525)
Sales(4,760) (3,284) 
(347,280) (4,760) (3,284)
Accumulated depreciation balance at end of year$326,251
 $309,401
 $289,574
$
 $326,251
 $309,401
(1)
Includes the write-off of fully depreciated assets totaling $106.4$54.5 million, $167.9$106.4 million and $65.1$167.9 million, during the years ended December 31, 2018, 2017 and 2016, and 2015, respectively.
(2)
Includes the write-off of fully depreciated assets totaling $1.8$6.7 million and $11.8$1.8 million, during the years ended December 31, 20172018 and 2015,2017, respectively.


F-46F-45