Mack Cali Realty L P 10-Q 22 Jul 15 2015 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - Jun. 30, 2015 - shares	Total
Document And Entity Information [Abstract]
Entity Registrant Name	MACK CALI REALTY L P
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Entity Central Index Key	1,067,063
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Entity Common Stock, Shares Outstanding	0

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Rental property
Land and leasehold interests	$ 749,359	$ 760,855
Buildings and improvements	3,751,805	3,753,300
Tenant improvements	414,166	431,969
Furniture, fixtures and equipment	12,867	12,055
Gross investment in rental property	4,928,197	4,958,179
Less - accumulated depreciation and amortization	(1,448,791)	(1,414,305)
Net investment in rental property	3,479,406	3,543,874
Cash and cash equivalents	19,813	29,549
Investments in unconsolidated joint ventures	284,507	247,468
Unbilled rents receivable, net	117,777	123,885
Deferred charges, goodwill and other assets, net	197,773	204,650
Restricted cash	42,052	34,245
Accounts receivable, net of allowance for doubtful accounts of $1,871 and $2,584	12,137	8,576
Total assets	4,153,465	4,192,247
LIABILITIES AND EQUITY
Senior unsecured notes	1,268,293	1,267,744
Mortgages, loans payable and other obligations	766,526	820,910
Distributions payable	15,582	15,528
Accounts payable, accrued expenses and other liabilities	134,089	126,971
Rents received in advance and security deposits	49,093	52,146
Accrued interest payable	30,659	26,937
Total liabilities	$ 2,264,242	$ 2,310,236
Commitments and contingencies
Partners' Capital:
General Partner, 89,195,529 and 89,076,578 common units outstanding	$ 1,576,560	$ 1,568,098
Limited partners, 11,012,069 and 11,083,876 common units outstanding	258,311	258,856
Total Mack-Cali Realty, L.P. partners' capital	1,834,871	1,826,954
Noncontrolling interests in consolidated joint ventures	54,352	55,057
Total equity	1,889,223	1,882,011
Total liabilities and equity	$ 4,153,465	$ 4,192,247

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts receivable	$ 1,871	$ 2,584
General partner common units outstanding	89,195,529	89,076,578
Limited partners common units outstanding	11,012,069	11,083,876

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES
Base rents	$ 121,246	$ 133,210	$ 245,039	$ 267,261
Escalations and recoveries from tenants	15,842	16,996	34,241	42,564
Real estate services	7,401	7,009	15,045	13,701
Parking income	2,850	2,236	5,392	4,350
Other income	1,228	849	2,565	2,020
Total revenues	148,567	160,300	302,282	329,896
EXPENSES
Real estate taxes	21,410	23,375	43,862	47,726
Utilities	13,399	14,573	30,974	42,854
Operating services	25,844	27,840	54,072	57,062
Real estate services expenses	6,208	6,571	12,847	13,280
General and administrative	11,988	13,673	22,999	36,554
Depreciation and amortization	42,365	44,711	83,167	89,696
Total expenses	121,214	130,743	247,921	287,172
Operating income	27,353	29,557	54,361	42,724
OTHER (EXPENSE) INCOME
Interest expense	(26,773)	(28,159)	(53,988)	(58,105)
Interest and other investment income	291	922	558	1,308
Equity in earnings (loss) of unconsolidated joint ventures	(2,329)	443	(5,858)	(792)
Realized gains (losses) on disposition of rental property, net	34,399	54,584	34,543	54,584
Gain on sale of investment in unconsolidated joint venture	6,448		6,448
Total other (expense) income	12,036	27,790	(18,297)	(3,005)
Net income	39,389	57,347	36,064	39,719
Noncontrolling interest in consolidated joint ventures	373	290	863	612
Net income available to common unitholders	$ 39,762	$ 57,637	$ 36,927	$ 40,331
Basic earnings per common unit:
Net income available to common unitholders	$ 0.40	$ 0.58	$ 0.37	$ 0.40
Diluted earnings per common unit:
Net income available to common unitholders	$ 0.40	$ 0.58	$ 0.37	$ 0.40
Basic weighted average units outstanding	100,272	99,993	100,269	99,935
Diluted weighted average units outstanding	100,314	100,023	100,313	99,964

Consolidated Statement Of Chang

Consolidated Statement Of Changes In Equity - 6 months ended Jun. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	General Partner Common Units [Member]	Limited Partners Common Units [Member]	General Partner Common Unitholders [Member]	Limited Partner Common Unitholders [Member]	Noncontrolling Interest In Consolidated Joint Ventures [Member]	Total
Balance, units at Dec. 31, 2014	89,077	11,084
Balance, value at Dec. 31, 2014			$ 1,568,098	$ 258,856	$ 55,057	$ 1,882,011
Net income			32,858	4,069	(863)	36,064
Distributions			(26,732)	(3,308)		(30,040)
Increase in noncontrolling interests					158	158
Redemption of limited partner common units for shares of general partner common units, units	72	(72)
Redemption of limited partner common units for shares of general partner common units, value			1,306	(1,306)
Shares issued under Dividend Reinvestment and Stock Purchase Plan, units	1
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value			25			25
Directors deferred compensation plan			197			197
Stock compensation, units	46
Stock compensation, value			808			808
Balance, units at Jun. 30, 2015	89,196	11,012
Balance, value at Jun. 30, 2015			$ 1,576,560	$ 258,311	$ 54,352	$ 1,889,223

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 36,064	$ 39,719
Adjustments to reconcile net income to net cash provided by Operating activities:
Depreciation and amortization, including related intangible assets	83,930	90,460
Amortization of deferred stock units	197	213
Amortization of stock compensation	805	5,563
Amortization of deferred financing costs	1,901	1,528
Amortization of debt discount and market to market	2,018	3,836
Equity in (earnings) loss of unconsolidated joint ventures	5,858	792
Distributions of cumulative earnings from unconsolidated joint ventures	2,698	3,756
Realized (gains) losses on disposition of rental property, net	(34,543)	(54,584)
Realized (gains) loss on sale of investment in unconsolidated joint venture	(6,448)
Changes in operating assets and liabilities:
Decrease (increase) in unbilled rents receivable, net	801	(3,551)
Increase in deferred charges, goodwill and other assets	(14,802)	(15,022)
Increase in accounts receivable, net	(3,561)	(2,325)
Increase in accounts payable, accrued expenses and other liabilities	1,478	22,540
Decrease in rents received in advance and security deposits	(3,053)	(4,798)
Increase (decrease) in accrued interest payable	6,342	(3,180)
Net cash provided by operating activities	79,685	84,947
CASH FLOWS FROM INVESTING ACTIVITIES
Rental property acquisitions and related intangibles	(4,057)	(37,696)
Rental property additions and improvements	(42,881)	(41,825)
Development of rental property, other related costs and deposits	(27,869)	(7,896)
Proceeds from the sales of rental property	80,581	190,798
Proceeds from the sale of investment in unconsolidated joint venture	6,448
Investments in notes receivable		(62,276)
Repayment of notes receivable	7,750	250
Investment in unconsolidated joint ventures	(49,305)	(38,948)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	1,985	837
Increase in restricted cash	(7,808)	(6,611)
Net cash used in investing activities	(35,156)	(3,367)
CASH FLOW FROM FINANCING ACTIVITIES
Borrowings from revolving credit facility	129,000	233,500
Repayment of revolving credit facility	(129,000)	(177,500)
Repayment of senior unsecured notes		(200,000)
Proceeds from mortgages and loans payable	2,897	28,135
Repayment of mortgages, loans payable and other obligations	(27,251)	(42,469)
Payment of contingent consideration		(3,936)
Payment of financing costs	(98)	$ (198)
Cash from noncontrolling interests	158
Payment of dividends and distributions	(29,971)	$ (59,875)
Net cash used in financing activities	(54,265)	(222,343)
Net decrease in cash and cash equivalents	(9,736)	(140,763)
Cash and cash equivalents, beginning of period	29,549	221,706
Cash and cash equivalents, end of period	$ 19,813	$ 80,943

Organization And Basis Of Prese

Organization And Basis Of Presentation	6 Months Ended
	Jun. 30, 2015
Organization And Basis Of Presentation [Abstract]
Organization And Basis Of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION Organization Mack-Cali Realty, L.P., a Delaware limited partnership, together with its subsidiaries (collectively, the “Company” or “Operating Partnership”), was formed on May 31, 1994 to conduct the business of providing leasing, management, acquisition, development, construction and tenant-related services for its sole general partner, Mack-Cali Realty Corporation (“the Corporation” or “General Partner”). The Company, through its operating divisions and subsidiaries, including the Mack-Cali property-owning partnerships and limited liability companies (collectively, the “Property Partnerships”) is the entity through which all of the General Partner’s operations are conducted. The General Partner is a fully-integrated self-administered, self-managed real estate investment trust (“REIT”). The General Partner controls the Company as its sole general partner and owned an 89.0 percent and 88.9 percent common unit interest in the Company as of June 30, 2015 and December 31, 2014 , respectively. The General Partner’s business is the ownership of interests in and operation of the Company, and all of the General Partner’s expenses are incurred for the benefit of the Company. The General Partner is reimbursed by the Company for all expenses it incurs relating to the ownership and operation of the Company. As of June 30, 2015 , the Company owned or had interests in 279 properties, consisting of 260 commercial properties, primarily class A office and office/flex properties, totaling approximately 30.5 million square feet, leased to approximately 2,000 commercial tenants, and 19 multi-family rental properties containing 5,644 residential units, plus developable land (collectively, the “Properties”). The Properties are comprised of 245 buildings, primarily office and office/flex buildings totaling approximately 30.0 million square feet (which include 36 buildings, primarily office buildings aggregating approximately 5.6 million square feet owned by unconsolidated joint ventures in which the Company has investment interests), six industrial/warehouse buildings totaling approximately 387,400 square feet, 19 multi-family properties totaling 5,644 apartments (which include 13 properties aggregating 4,343 apartments owned by unconsolidated joint ventures in which the Company has investment interests), five parking/retail properties totaling approximately 121,500 square feet (which include two buildings aggregating 81,500 square feet owned by unconsolidated joint ventures in which the Company has investment interests), one hotel (which is owned by an unconsolidated joint venture in which the Company has an investment interest) and three parcels of land leased to others. The Properties are located in seven states, primarily in the Northeast, plus the District of Columbia. BASIS OF PRESENTATION The accompanying consolidated financial statements include all accounts of the Company, its majority-owned and/or controlled subsidiaries and variable interest entities for which the Company has determined itself to be the primary beneficiary, if any. See Note 2: Significant Accounting Policies – Investments in Unconsolidated Joint Ventures, for the Company’s treatment of unconsolidated joint venture interests. Intercompany accounts and transactions have been eliminated. Accounting Standards Codification (“ASC”) 810, Consolidation, provides guidance on the identification of entities for which control is achieved through means other than voting rights (“variable interest entities” or “VIEs”) and the determination of which business enterprise, if any, should consolidate the VIEs. Generally, the consideration of whether an entity is a VIE applies when either: (1) the equity investors (if any) lack one or more of the essential characteristics of a controlling financial interest; (2) the equity investment at risk is insufficient to finance that entity’s activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and the activities of the entity involve or are conducted on behalf of an investor with a disproportionately small voting interest. The Company consolidates VIEs in which it is considered to be the primary beneficiary. The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance: and (2) the obligation to absorb losses and right to receive the returns from the VIE that would be significant to the VIE. As of June 30, 2015 and December 31, 2014 , the Company’s investments in consolidated real estate joint ventures in which the Company is deemed to be the primary beneficiary have total real estate assets of $ 247.3 million and $242.9 million, respectively, mortgages of $ 96.9 million and $94.3 million, respectively, and other liabilities of $ 16.6 million and $15.7 million, respectively. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Certain reclassifications have been made to prior period amounts in order to conform with current period presentation.

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2015
Significant Accounting Policies [Abstract]
Significant Accounting Policies	2. SIGNIFICANT ACCOUNTING POLICIES Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. Acquisition ‑related costs are expensed as incurred. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 1.2 million and $0.9 million for the three months ended June 30, 2015 and 2014 , respectively, and $2.5 million and $1.8 million for the six months ended June 30, 2015 and 2014, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $ 83.2 million and $ 62.8 million as of June 30, 2015 and December 31, 2014 , respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of tenant improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative square footage of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below market leases, (ii) in-place leases and (iii) tenant relationships. The Company allocates the purchase price to the assets acquired and liabilities assumed based on their fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed exceed the purchase consideration of a transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The value of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The value of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management include reviewing low leased percentages, significant near-term lease expirations, recently acquired properties, current and historical operating and/or cash flow losses, near-term mortgage debt maturities or other factors that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated by each property are based on a number of assumptions. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future. Rental Property Held for Sale When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of selling costs, of such assets. If, in management’s opinion, the estimated net sales price of the assets which have been identified as held for sale is less than the net book value of the assets, a valuation allowance is established. If circumstances arise that previously were considered unlikely and, as a result, the Company decides not to sell a property previously classified as held for sale, the property is reclassified as held and used. A property that is reclassified is measured and recorded individually at the lower of (a) its carrying amount before the property was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the property been continuously classified as held and used, or (b) the fair value at the date of the subsequent decision not to sell. Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future . See Note 4: Investments in Unconsolidated Joint Ventures. Cash and Cash Equivalents All highly liquid investments with a maturity of three months or less when purchased are considered to be cash equivalents. Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Amortization of such costs is included in interest expense and was $ 948,000 and $ 759,000 for the three months ended June 30, 2015 and 2014 , respectively, and $1,901,000 and $1,528,000 for the six months ended June 30, 2015 and 2014 , respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (loss) from early extinguishment of debt. No such unamortized costs were written off for the six months ended June 30, 2015 and 2014. Deferred Leasing Costs Costs incurred in connection with commercial leases are capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs are charged to amortization expense upon early termination of the lease. Certain employees of the Corporation are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which is capitalized and amortized, approximated $ 846,000 and $ 845,000 for the three months ended June 30, 2015 and 2014 , respectively, and $1,816,000 and $1,876,000 for the six months ended June 30, 2015 and 2014 , respectively. Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying amount, then performing the additional two-step impairment test is unnecessary. If the carrying amount of goodwill exceeds its fair value, an impairment charge is recognized. Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period. Revenue Recognition Base rental revenue is recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. Escalations and recoveries from tenants are received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 15: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income includes income from parking spaces leased to tenants and others. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations. Allowance for Doubtful Accounts Management performs a detailed review of amounts due from tenants to determine if an allowance for doubtful accounts is required based on factors affecting the collectability of the accounts receivable balances. The factors considered by management in determining which individual tenant receivable balances, or aggregate receivable balances, require a collectability allowance include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of the allowance for doubtful accounts requires management to exercise significant judgment about the timing, frequency and severity of collection losses, which affects the allowance and net income. Income and Other Taxes The Company is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. Certain of the Company’s corporate subsidiaries are taxable REIT subsidiaries (each a “TRS”). In general, a TRS may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The Company has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. As of June 30, 2015 , the Company had a deferred tax asset related to its TRS activity with a balance of approximately $ 15.3 million which has been fully reserved for through a valuation allowance. If the Corporation fails to qualify as a REIT in any taxable year, the Corporation will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates. The Corporation is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of June 30, 2015 , the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2010 forward. Earnings Per Unit The Company presents both basic and diluted earnings per unit (“EPU”). Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount from continuing operations amount. Units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable units included in diluted EPU shall be based on the number of units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable units shall be included in the denominator of diluted EPU as of the beginning of the period (or as of the date of the grant, if later). Distributions Payable The distributions payable at June 30, 2015 represents distributions payable to common unitholders ( 100,101,735 units) for all such holders of record as of July 6, 2015 with respect to the second quarter 2015 . The second quarter 2015 common unit distributions of $ 0.15 per common unit were approved by the Corporation’s Board of Directors on May 11, 2015 and paid on July 14, 2015 . The distributions payable at December 31, 2014 represents distributions payable to common unitholders ( 99,950,528 units), for all such holders of record as of January 6, 2015 with respect to the fourth quarter 2014 . The fourth quarter 2014 common unit distributions of $ 0.15 per common unit were approved by the Corporation’s Board of Directors on December 9, 2014 and paid on January 14, 2015 . Costs Incurred For Stock Issuances Costs incurred in connection with the Corporation’s stock issuances are reflected as a reduction of General Partner’s capital. Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”) , restricted stock units (“RSUs”), performance share units (“PSUs”), total stockholder return based performance shares (“TSR”) and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. The Company recorded stock compensation expense of $ 492,000 and $ 877,000 for the three months ended June 30, 2015 and 2014 , respectively, and $805,000 and $4,264,000 for the six months ended June 30, 2015 and 2014, respectively. The amount for the six months ended June 30, 2014 included $3,203,000 related to the departure of certain executive officers. Other Comprehensive Income Other comprehensive income (loss), if any, includes items that are recorded in equity, such as unrealized holding gains or losses on marketable securities available for sale. There was no difference in other comprehensive income to net income for the three and six months ended June 30, 2015 and 2014 , and no accumulated other comprehensive income as of June 30, 2015 and December 31, 2014 . Fair Value Hierarchy The standard Fair Value Measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources (observable inputs). The following summarizes the fair value hierarchy: · Level 1: Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities; · Level 2: Quoted prices for identical assets and liabilities in markets that are inactive, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly, such as interest rates and yield curves that are observable at commonly quoted intervals and · Level 3: Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Discontinued Operations In April 2014, the Financial Accounting Standards Board (“ FASB ”) issued guidance related to the reporting of discontinued operation and disclosures of disposals of components of an entity. This guidance defines a discontinued operation as a component or group of components disposed or classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and final result; the guidance states that a strategic shift could include a disposal of a major geographical area of operations, a major line of business, a major equity method investment or other major parts of an entity. The guidance also provides for additional disclosure requirements in connection with both discontinued operations and other dispositions not qualifying as discontinued operations. The guidance is effective for all companies for annual and interim periods beginning on or after December 15, 2014. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date. All entities could early adopt the guidance for new disposals (or new classifications as held for sale) that had not been reported in financial statements previously issued or available for issuance. The Company elected to early adopt this standard effective with the interim period beginning January 1, 2014. Prior to January 1, 2014, properties identified as held for sale and/or disposed of were presented in discontinued operations for all periods presented. Impact Of Recently-Issued Accounting Standards In May 2014, the FASB issued Accounting Standards Update (“ASU”) 2014-09 Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. In adopting ASU 2014-09, companies may use either a full retrospective or a modified retrospective approach. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU 2014-09 is effective for the first interim period within annual reporting periods beginning after December 15, 2017, and early adoption is permitted for periods beginning after December 15, 2016. The Company is currently in the process of evaluating the impact the adoption of ASU 2014-09 will have on the Company’s financial position or results of operations. In June 2014, the FASB issued ASU 2014-12 Compensation—Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (“ASU 2014-12”). The amendments in ASU 2014-12 apply to all reporting entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. That is, the employee would be eligible to vest in the award regardless of whether the employee is rendering service on the date the performance target is achieved. Current GAAP does not contain explicit guidance on how to account for those share-based payments. ASU 2014-12 is intended to resolve the accounting treatment of such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015 with early adoption permitted. The Company is currently in the process of evaluating the impact the adoption of ASU 2014-12 will have on the Company’s financial position or results of operations. In August 2014, the FASB issued ASU 2014-15, which requires management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern, and to provide certain disclosures when it is probable that the entity will be unable to meet its obligations as they become due within one year after the date that the financial statements are issued. ASU 2014-15 is effective for the annual period ended December 31, 2016 and for annual periods and interim periods thereafter with early adoption permitted. The adoption of ASU 2014-15 is not expected to materially impact the Company’s consolidated financial statements. In February 2015, the FASB issued ASU 2015-02, Consolidation–Amendments to the Consolidation Analysis (Topic 810) (“ASU 2015-02”). ASU 2015-02 updates guidance related to accounting for consolidation of certain limited partnerships. ASU 2015-02 does not add or remove any of the five characteristics that determine if an entity is a VIE; however, it changes the manner in which a reporting entity assesses its ability to make decisions about the entity's activities. Additionally, ASU 2015-02 removes three of the six criteria that must be met for a fee arrangement to not be a VIE and modifies how an entity assesses interests held through related parties. ASU 2015-02 is effective for fiscal years and interim periods within those years beginning after December 15, 2015, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements when adopted. In April 2015, the FASB issued ASU 2015-03, Interest–Imputation of Interest-Simplifying the Presentation of Debt Issuance Costs (Subtopic 835-30) (“ASU 2015-03”). ASU 2015-03 requires debt issuance costs related to a recognized debt liability paid to third parties other than the lender to be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of this guidance is permitted for financial statements that have not been previously issued, and an entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements when adopted.

Recent Transactions

Recent Transactions	6 Months Ended
	Jun. 30, 2015
Recent Transactions [Abstract]
Recent Transactions	3. RECENT TRANSACTIONS Appointment of executive officers On June 3, 2015, the Company announced the appointments of Mitchell E. Rudin as chief executive officer and Michael J. DeMarco as president and chief operating officer of the Corporation, effective immediately. The Corporation entered into employment agreements dated June 3, 2015 with each of Messrs. Rudin and DeMarco (together, the “Executive Employment Agreements”) that each provide as follows: · A term that ends on December 31, 2018 (the “Employment Term”) unless earlier terminated; · An annual base salary for each of Messrs. Rudin and DeMarco of $700,000 , subject to potential merit increases (but not decreases) each year; · A target annual bonus opportunity of one hundred percent ( 100% ) of base salary, or $700,000 , for each of Messrs. Rudin and DeMarco, with a threshold bonus of fifty percent ( 50% ) of base salary , or $350,000 , and a maximum bonus of two hundred percent ( 200% ) of base salary , or $1,400,000 , a pro rata bonus opportunity for 2015 based on the assessment of the Executive Compensation and Option Committee of the Board of Directors (“Committee”) of each executive’s development of a strategic plan for the Corporation and bonuses for 2016 and subsequent years to be based on objective performance goals to be established annually by the Committee; · 2015 long-term incentive (“LTI”) awards under the Corporation’s 2013 Incentive Stock Plan (the “2015 LTI Awards”) , consisting of the granting to each of Messrs. Rudin and DeMarco on June 5, 2015 of 18,775.27 restricted stock units subject to time-based vesting over three years, and of 56,325.82 performance share units (“PSUs”) which will vest from 0 to 150 percent of the number of PSUs granted based on the Corporation’s total shareholder return relative to a peer group of equity office REITs over a three -year performance period; and · The grant on June 5, 2015 (the “Grant Date”) to each of Messrs. Rudin and DeMarco of options to purchase 400,000 shares of the Corporation ’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the Corporation ’s common stock on the NYSE on the Grant Date (which price was $17.31 per share), with 200,000 of such options vesting in three equal annual installments commencing on the first anniversary of the Grant Date, and 200,000 of such options vesting if the Corporation ’s common stock trades at or above $25.00 per share for 30 consecutive trading days while Mr. Rudin and Mr. DeMarco is employed, as applicable, or on or before June 30, 2019 if Mr. Rudin and Mr. DeMarco is employed for the entire Employment Term (except if the executive’s employment has been terminated by the Corporation for cause following expiration of the Employment Term). Acquisition On April 1, 2015, the Company acquired vacant land to accommodate the development of 365 multi-family residential units located in Worcester, Massachusetts (the “CitySquare Project”) for a purchase price of $3.1 million with an additional $1.25 million to be paid (which is accrued as of June 30, 2015) , subject to certain conditions, in accordance with the terms of the purchase and sale agreement. The purchase price for the acquisition was funded primarily through borrowing under the Company’s unsecured revolving credit facility. The Company is required to begin construction of the CitySquare Project within 12 months of closing. The Company plans to start construction in the third quarter 2015 and the total development costs are estimated to be approximately $91.4 million. Dispositions On June 26, 2015, the Company sold its 203,506 square foot office property located at 14 Sylvan Way in Parsippany, New Jersey for net sales proceeds of approximately $80 million, with a gain of approximately $24.7 million from the sale. On June 1, 2015, the Company sold its 25 percent equity interest in Rose wood Lafayette Holdings L.L.C., a joint venture which owns the Highland s at Morristown Station, a 217 -unit multi-family property located in Morristown, New Jersey , to its joint venture partner and realized a gain on the sale of $6.4 million. On January 15, 2015, the Company sold its 21,600 square foot office/flex property located at 1451 Metropolitan Drive in West Deptford, New Jersey for net sales proceeds of approximately $1.1 million, with a gain of approximately $0.1 million from the sale. During the quarter ended June 30, 2015, the Company transferred the deeds for two of its office properties to the lender in satisfaction of its mortgage loan obligations. The properties transferred consisted of 4 Sylvan Way in Parsippany , New Jersey, aggregating 105,135 square feet, which was collateral for a $14.6 million mortgage loan that matured on August 11, 2014 , and 10 Independence Boulevard in Warren, New Jersey, aggregating 120,528 square feet, which was collateral for a $16.9 million mortgage loan that matured on August 11, 2014 . The Company had previously recorded impairment charges on the properties totaling $12.2 million at September 30, 2013. As a result, the Company recorded a gain on the disposal of the two office properties for a total of $9.7 million during the quarter. On January 1, 2014, the Company early adopted the new discontinued operations accounting standard and as the properties disposed of during the six months ended June 30, 2015 will not represent a strategic shift (as the Company is not entirely exiting markets or property types), they have not been reflected as part of discontinued operations. The following table summarizes income for the three and six month periods ended June 30, 2015 and 2014 from the properties disposed of during the six months ended June 30, 2015 and the 16 properties sold during the year ended December 31, 2014: (dollars in thousands) Three Months Ended Six Months Ended June 30, June 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest income Income from properties disposed of $ $ $ $ Realized gains on dispositions Total income from properties disposed of $ $ $ $

Investments In Unconsolidated J

Investments In Unconsolidated Joint Ventures	6 Months Ended
	Jun. 30, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Investments In Unconsolidated Joint Ventures	4. INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES As of June 30, 2015 , the Company had an aggregate investment of approximately $ 284.5 million in its equity method joint ventures. The Company formed these ventures with unaffiliated third parties, or acquired interests in them, to develop or manage primarily office and multi-family rental properties, or to acquire land in anticipation of possible development of office and multi-family rental properties. As of June 30, 2015 , the unconsolidated joint ventures owned: 36 office and two retail properties aggregating approximately 5.7 million square feet, 13 multi-family properties totaling 4,343 apartments, a 350 -room hotel, development projects for up to approximately 1,074 apartments; and interests and/or rights to developable land parcels able to accommodate up to 2,910 apartments and 1.4 million square feet of office space. The Company’s unconsolidated interests range from 7.5 percent to 85 percent subject to specified priority allocations in certain of the joint ventures. On October 23, 2012, the Company acquired the real estate development and management businesses (the “Roseland Business”) of Roseland Partners, L.L.C. (“Roseland Partners”), a premier multi-family rental community developer and manager based in Short Hills, New Jersey, and the Roseland Partners’ interests (the “Roseland Transaction”), principally through unconsolidated joint venture interests in various entities which, directly or indirectly, own or have rights with respect to various residential and/or commercial properties or vacant land (collectively, the “Roseland Assets”). The locations of the properties extend from New Jersey to Massachusetts, with the majority of the properties located in New Jersey. Certain of the entities which own the Roseland Assets are controlled by the Company upon acquisition and are therefore consolidated. However, many of the entities are not controlled by the Company and, therefore, are accounted for under the equity method as investments in unconsolidated joint ventures. The amounts reflected in the following tables (except for the Company’s share of equity in earnings) are based on the historical financial information of the individual joint ventures. The Company does not record losses of the joint ventures in excess of its investment balances unless the Company is liable for the obligations of the joint venture or is otherwise committed to provide financial support to the joint venture. The outside basis portion of the Company’s investments in joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Unless otherwise noted below, the debt of the Company’s unconsolidated joint ventures generally is non-recourse to the Company, except for customary exceptions pertaining to such matters as intentional misuse of funds, environmental conditions, and material misrepresentations. The Company has agreed to guarantee repayment of a portion of the debt of its unconsolidated joint ventures. As of June 30, 2015 , such debt had a total facility amount of $477 million of which the Company agreed to guarantee up to $67.8 million. As of June 30, 2015 , the outstanding balance of such debt totaled $263.6 million of which $36.9 million was guaranteed by the Company. The Company also posted a $4.1 million letter of credit in support of the South Pier at Harborside joint venture, half of which is indemnified by Hyatt Corporation, the Company’s joint venture partner. The Company performed management, leasing, development and other services for the properties owned by the unconsolidated joint ventures and recognized $1.4 million and $1.4 million for such services in the three months ended June 30, 2015 and 2014 , respectively, and $3.1 million and $2.8 million for the six months ended June 30, 2015 and 2014 , respectively , which are included in real estate services revenue for the periods presented . The Company had $0.8 million and $ 1.0 million in accounts receivable due from its unconsolidated joint ventures as of June 30, 2015 and December 31, 2014 . Included in the Company’s investments in unconsolidated joint ventures as of June 30, 2015 are nine unconsolidated development joint ventures, which are VIEs for which the Company is not the primary beneficiary. These joint ventures are primarily established to develop real estate property for long-term investment and were deemed VIEs primarily based on the fact that the equity investment at risk was not sufficient to permit the entities to finance their activities without additional financial support. The initial equity contributed to these entities was not sufficient to fully finance the real estate construction as development costs are funded by the partners throughout the construction period. The Company determined that it was not the primary beneficiary of these VIEs based on the fact that the Company has shared control of these entities along with the entity’s partners and therefore does not have controlling financial interests in these VIEs. The Company’s aggregate investment in these VIEs was approximately $ 154.3 million as of June 30, 2015 . The Company’s maximum exposure to loss as a result of its involvement with these VIEs is estimated to be approximately $ 206.1 million, which includes the Company’s current investment and estimated future funding commitments/guarantees of approximately $ 51.8 million. The Company has not provided financial support to these VIEs that it was not previously contractually required to provide. In general, future costs of development not financed through third party will be funded with capital contributions from the Company and its outside partners in accordance with their respective ownership percentages. The following is a summary of the Company's unconsolidated joint ventures as of June 30, 2015 and December 31, 2014: (dollars in thousands) Property Debt Number of Company's Carrying Amount As of June 30, 2015 Apartment Units Effective June 30, December 31, Maturity Interest Entity / Property Name or Square Feet (sf) Ownership % (a) Balance Date Rate Multi-family Marbella RoseGarden, L.L.C./ Marbella (b) units % $ $ $ 05/01/18 % RoseGarden Monaco Holdings, L.L.C./ Monaco (b) units % 02/01/21 % Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station (c) units % - - - - PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial (b) units % - - 09/01/20 % Rosewood Morristown, L.L.C. / Metropolitan at 40 Park (d) (e) units % (f) (f) Overlook Ridge JV 2C/3B, L.L.C./The Chase at Overlook Ridge (b) units % 12/26/15 L+2.50 % (g) PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial (b) units % 07/15/21 % (h) Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C) (b) units % - - 03/01/30 % (i) Crystal House Apartments Investors LLC / Crystal House (j) units % 04/01/20 % Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7 (b) units % 12/04/15 L+2.50 % (k) PruRose Port Imperial South 13, LLC / RiverParc at Port Imperial (b) units % 06/27/16 L+2.15 % (l) Roseland/Port Imperial Partners, L.P./ Riverwalk C (b) (m) units % - - - RoseGarden Marbella South, L.L.C./ Marbella II units % 03/30/17 L+2.25 % (n) Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B) (b) units % - - 03/01/30 % (o) Riverpark at Harrison I, L.L.C./ Riverpark at Harrison units % 06/27/16 L+2.35 % (p) Capitol Place Mezz LLC / Station Townhouses units % 07/01/33 % (q) Harborside Unit A Urban Renewal, L.L.C. / URL Harborside units % - 08/01/29 % (r) RoseGarden Monaco, L.L.C./ San Remo Land potential units % - - - Grand Jersey Waterfront URA, L.L.C./ Liberty Landing potential units % - - - Office Red Bank Corporate Plaza, L.L.C./ Red Bank sf % 05/17/16 L+3.00 % (s) 12 Vreeland Associates, L.L.C./ 12 Vreeland Road sf % 07/01/23 % BNES Associates III / Offices at Crystal Lake sf % 11/01/23 % Hillsborough 206 Holdings, L.L.C./ Hillsborough 206 sf % - - - KPG-P 100 IMW JV, LLC / 100 Independence Mall West sf % - 09/09/16 L+7.00 % (t) Keystone-Penn sf (u) - - (v) (v) Keystone-TriState sf (w) (x) (x) KPG-MCG Curtis JV, L.L.C./ Curtis Center (y) sf % (z) (z) (z) Other Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations) sf % - - - Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial (b) sf % - - - South Pier at Harborside / Hyatt Regency Jersey City on the Hudson rooms % (aa) (aa) (ab) (ab) Stamford SM LLC / Senior Mezzanine Loan (ac) n/a n/a % - - - - - Other (ad) - - - Totals: $ $ $ (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures. (d) Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 25 percent interest in a to-be-built 59 -unit, five story multi-family rental development property ("Lofts at 40 Park"). (e) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the payment of the outstanding balance remaining on a note ($975 as of June 30, 2015), and is not expected to meaningfully participate in the venture's cash flows in the near term. (f) Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600 , bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015 ; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500 , bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117 , bears interest at LIBOR plus 250 basis points and matures in September 2015 . The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved. (g) The construction loan has a maximum borrowing amount of $55,500 and provides, subject to certain conditions, two one -year extension options with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 3.0875 percent per annum on an initial notional amount of $1,840 , increasing to $52,000 , for the period from September 3, 2013 to November 2, 2015. (h) The permanent loan has a maximum borrowing amount of $80,249 . (i) The construction loan with a maximum borrowing amount of $91,000 converted to a permanent loan on February 27, 2015. (j) The Company also owns a 50 percent interest in a vacant land to accommodate the development of approximately 295 additional units of which 252 are currently approved. (k) The construction loan has a maximum borrowing amount of $42,500 and provides, subject to certain conditions, two two-year extension options with a fee of 12.5 basis points for the first two -year extension and 25 basis points for the second two -year extension. (l) The construction loan has a maximum borrowing amount of $73,350 and provides, subject to certain conditions, one -year extension option followed by a six -month extension option with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 2.79 percent per annum on an initial notional amount of $1,620 , increasing to $69,500 for the period from July 1, 2013 to January 1, 2016. (m) The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J ("Port Imperial North Land") that can accommodate the development of 836 apartment units. (n) The construction loan has a maximum borrowing amount of $77,400 and provides, subject to certain conditions, two one -year extension options with a fee of 25 basis points for each year. (o) The construction loan with a maximum borrowing amount of $57,000 converted to a permanent loan on February 27, 2015. (p) The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one -year extension options with a fee of 20 basis points for each year. (q) The construction/permanent loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017. (r) The construction/permanent loan has a maximum borrowing amount of $192,000 . (s) The joint venture has a swap agreement that fixes the all-in rate to 3.99375 percent per annum on an initial notional amount of $13,650 and then adjusting in accordance with an amortization schedule, which is effective from October 17, 2011 through loan maturity. (t) The mortgage loan has two one -year extension options, subject to certain conditions, and includes a $25 million construction escrow with a balance of $5.7 million to be drawn at June 30, 2015. (u) The Company’s equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally. (v) Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023 ; principal balance of $69,320 bears interest at rates ranging from LIBOR+5.0 percent to LIBOR+5.75 percent and matures in August 27, 2016 ; principal balance of $10,425 bears interest at LIBOR+6.0 percent matures in August 27, 2015 . (w) Includes the Company’s pari-passu interests of $4.5 million in five properties and Company’s subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally. (x) Principal balance of $41,848 bears interest at 4.95 percent and matures on July 1, 2017 ; principal balance of $71,724 bears interest at rates ranging from 5.65 percent to 6.75 percent and matures on September 9, 2017 ; principal balance of $14,250 bears interest at 4.88 percent and matures on July 6, 2024 ; principal balance of $63,400 bears interest at 4.93 percent and matures on July 6, 2044 ; principal balance of $15,050 bears interest at 4.71 percent and matures on August 6, 2044 . (y) Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. (z) See Note 9: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets. (aa) The negative carrying amount for this venture of $2,570 and $1,854 as of June 30, 2015 and December 31, 2014, respectively, were included in accounts payable, accrued expenses and other liabilities. (ab) Balance includes: (i) mortgage loan, collateralized by the hotel property, with a balance of $60,844 , bears interest at 6.15 percent and matures in November 2016 , and (ii) loan with a balance of $4,124 , bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020 . The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner. (ac) The joint venture collected net proceeds of $47.2 million at maturity, of which the Company received its share of $37.8 million on August 6, 2014. (ad) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term. The following is a summary of the Company’s equity in earnings (loss) of unconsolidated joint ventures for the three and six months ended June 30, 2015 and 2014 : (dollars in thousands) Three Months Ended Six Months Ended June 30, June 30, Entity / Property Name Multi-family Marbella RoseGarden, L.L.C./ Marbella $ $ $ $ RoseGarden Monaco Holdings, L.L.C./ Monaco Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station - PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial - - - - Rosewood Morristown, L.L.C. / Metropolitan at 40 Park Overlook Ridge JV 2C/3B, L.L.C./The Chase at Overlook Ridge - PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C) - - Crystal House Apartments Investors LLC / Crystal House Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7 PruRose Port Imperial South 13, LLC / RiverParc at Port Imperial Roseland/Port Imperial Partners, L.P./ Riverwalk C RoseGarden Marbella South, L.L.C./ Marbella II - - - - Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B) - - - Riverpark at Harrison I, L.L.C./ Riverpark at Harrison - - Capitol Place Mezz LLC / Station Townhouses - - Harborside Unit A Urban Renewal, L.L.C. / URL Harborside - - RoseGarden Monaco, L.L.C./ San Remo Land - - - - Grand Jersey Waterfront URA, L.L.C./ Liberty Landing - Office Red Bank Corporate Plaza, L.L.C./ Red Bank 12 Vreeland Associates, L.L.C./ 12 Vreeland Road BNES Associates III / Offices at Crystal Lake Hillsborough 206 Holdings, L.L.C./ Hillsborough 206 - KPG-P 100 IMW JV, LLC / 100 Independence Mall West Keystone-Penn - - - - Keystone-TriState - - KPG-MCG Curtis JV, L.L.C./ Curtis Center Other Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations) Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial South Pier at Harborside / Hyatt Regency Jersey City on the Hudson Stamford SM LLC / Senior Mezzanine Loan - - Other Company's equity in earnings (loss) of unconsolidated joint ventures $ $ $ $ The following is a summary of the financial position of the unconsolidated joint ventures in which the Company had investment interests as of June 30, 2015 and December 31, 2014 : (dollars in thousands) June 30, December 31, Assets: Rental property, net $ $ Other assets Total assets $ $ Liabilities and partners'/ members' capital: Mortgages and loans payable $ $ Other liabilities Partners'/members' capital Total liabilities and partners'/members' capital $ $ The following is a summary of the results from operations of the unconsolidated joint ventures for the period in which the Company had investment interests during the three and six months ended June 30, 2015 and 2014 : (dollars in thousands) Three Months Ended Six Months Ended June 30, June 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest expense Net loss $ $ $ $ Recent Transactions OVERLOOK RIDGE JV, LLC/QUARRYSTONE AT OVERLOOK RIDGE On May 13, 2015, LR Overlook Phase II, LLC, of which the Company held a 50 percent interest, sold its 251 -unit multi-family rental property located in Malden, Massachusetts (“Quarrystone Property”) for approximately $74.6 million. The Company received no share of the distributable cash from the sale as the Company’s equity interest in the venture is subordinated to its joint venture partner , and realized no gain or loss from the sale. ROSEWOOD LAFAYETTE HOLDINGS, L.L.C./HIGHLANDS AT MORRISTOWN STATION On June 1, 2015, the Company sold its 25 percent equity interest in Rose wood Lafayette Holdings L.L.C., a joint venture which owns the Highland s at Morristown Station, a 217 -unit multi-family property located in Morristown, New Jersey , to its joint venture partner and realized a gain on the sale of $6.4 million.

Deferred Charges, Goodwill And

Deferred Charges, Goodwill And Other Assets, Net	6 Months Ended
	Jun. 30, 2015
Deferred Charges, Goodwill And Other Assets, Net [Abstract]
Deferred Charges, Goodwill And Other Assets, Net	5. DEFERRED CHARGES, GOODWILL AND OTHER ASSETS , NET June 30, December 31, (dollars in thousands) Deferred leasing costs $ $ Deferred financing costs Accumulated amortization Deferred charges, net Notes receivable (a) In-place lease values, related intangibles and other assets, net Goodwill Prepaid expenses and other assets, net Total deferred charges, goodwill and other assets, net $ $ (a) Includes as of June 30, 2015 : a mortgage receivable for $ 10.4 million which bears interest at LIBOR plus six percent and matures in August 2016 ; and an interest-free note receivable with a net present value of $ 3.2 million and matures in April 2023 . The Company believes these balances are fully collectible. DERIVATIVE FINANCIAL INSTRUMENTS The Company does not have any derivative instruments designated as cash flow hedges. The following table summarizes the notional and fair value of the Company’s derivative financial instruments, designated as fair value hedges, as of June 30, 2015 and December 31, 2014 (dollars in thousands): Fair Value Notional Strike Effective Expiration June 30, December 31, Value (a) Rate Date Date LIBOR Cap $ % September 2014 October 2015 $ - $ LIBOR Cap % September 2014 October 2015 - LIBOR Cap % October 2015 October 2016 LIBOR Cap % October 2015 October 2016 $ $ (a) The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks. The Company includes these derivative financial instruments in deferred charges, goodwill and other assets, net. As changes in the fair value of the se derivative financial instrument s are recorded in earnings , the Company recorded a loss on the change in fair value of $17,000 and $80,000 during the three and six months ended June 30, 2015 , respectively, which is included in interest and other investment income in the consolidated statements of operations.

Restricted Cash

Restricted Cash	6 Months Ended
	Jun. 30, 2015
Restricted Cash [Abstract]
Restricted Cash	6. RESTRICTED CASH Restricted cash generally includes tenant and resident security deposits for certain of the Company’s properties, and escrow and reserve funds for debt service, real estate taxes, property insurance, capital improvements, tenant improvements, and leasing costs established pursuant to certain mortgage financing arrangements, and is comprised of the following: (dollars in thousands) June 30, December 31, Security deposits $ $ Escrow and other reserve funds Total restricted cash $ $

Senior Unsecured Notes

Senior Unsecured Notes	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Senior Unsecured Notes	7. SENIOR UNSECURED NOTES A summary of the Company’s senior unsecured notes as of June 30, 2015 and December 31, 2014 is as follows: (dollars in thousands) June 30, December 31, Effective Rate (1) 5.800% Senior Unsecured Notes, due January 15, 2016 $ $ % 2.500% Senior Unsecured Notes, due December 15, 2017 % 7.750% Senior Unsecured Notes, due August 15, 2019 % 4.500% Senior Unsecured Notes, due April 18, 2022 % 3.150% Senior Unsecured Notes, due May 15, 2023 % Total senior unsecured notes $ $ (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable. The terms of the Company’s senior unsecured notes include certain restrictions and covenants which require compliance with financial ratios relating to the maximum amount of debt leverage, the maximum amount of secured indebtedness, the minimum amount of debt service coverage and the maximum amount of unsecured debt as a percent of unsecured assets. The Company was in compliance with its debt covenants under the indenture relating to its senior unsecured notes as of June 30, 2015 .

Unsecured Revolving Credit Faci

Unsecured Revolving Credit Facility	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Unsecured Revolving Credit Facility	8. UNSECURED REVOLVING CREDIT FACILITY On July 16, 2013, the Company amended and restated its unsecured revolving credit facility with a group of 17 lenders. The $ 600 million facility is expandable to $ 1 billion and matures in July 2017 . It has two six -month extension options each requiring the payment of a 7.5 basis point fee. The interest rate on outstanding borrowings (not electing the Company’s competitive bid feature) and the facility fee on the current borrowing capacity payable quarterly in arrears are based upon the Operating Partnership’s unsecured debt ratings, as follows: Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 BBB- or Baa3 (current) BBB or Baa2 BBB+ or Baa1 A- or A3 or higher The facility has a competitive bid feature, which allows the Company to solicit bids from lenders under the facility to borrow up to $ 300 million at interest rates less than those above. The terms of the unsecured facility include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the facility described below, or (ii) the property dispositions are completed while the Company is under an event of default under the facility, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio ( 60 percent), the maximum amount of secured indebtedness ( 40 percent), the minimum amount of fixed charge coverage ( 1.5 times), the maximum amount of unsecured indebtedness ( 60 percent), the minimum amount of unencumbered property interest coverage ( 2.0 times) and certain investment limitations (generally 15 percent of total capitalization). If an event of default has occurred and is continuing, the Corporation will not make any excess distributions except to enable the Corporation to continue to qualify as a REIT under the Code. The Company was in compliance with its debt covenants under its revolving credit facility as of June 30, 2015 . As of June 30, 2015 and December 31, 2014, the Company had no outstanding borrowings under its unsecured revolving credit facility.

Mortgages, Loans Payable And Ot

Mortgages, Loans Payable And Other Obligations	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Mortgages, Loans Payable And Other Obligations	9. MORTGAGES, LOANS PAYABLE AND OTHER OBLIGATIONS The Company has mortgages, loans payable and other obligations which primarily consist of various loans collateralized by certain of the Company’s rental properties. As of June 30, 2015 , 26 of the Company’s properties, with a total book value of approximately $ 932 million, are encumbered by the Company’s mortgages and loans payable. Payments on mortgages, loans payable and other obligations are generally due in monthly installments of principal and interest, or interest only. Except as noted below, the Company was in compliance with its debt covenants under its mortgages and loans payable as of June 30, 2015 . A summary of the Company’s mortgages, loans payable and other obligations as of June 30, 2015 and December 31, 2014 is as follows: (dollars in thousands) Effective June 30, December 31, Property Name Lender Rate (a) Maturity Overlook - Site IIID,IIIC, IIIA (b) Wells Fargo Bank N.A. LIBOR+3.50 % - $ Overlook - Site IIB (Quarrystone I) (b) Wells Fargo Bank N.A. LIBOR+2.50 % - 4 Sylvan (c) Wells Fargo CMBS % - 10 Independence (d) Wells Fargo CMBS % - 6 Becker, 85 Livingston, Wells Fargo CMBS % $ 08/11/14 (f) 75 Livingston & 20 Waterview (e) 9200 Edmonston Road Principal Commercial Funding L.L.C. % 05/01/15 (g) Port Imperial South Wells Fargo Bank N.A. LIBOR+1.75 % 09/19/15 4 Becker Wells Fargo CMBS % 05/11/16 5 Becker (h) Wells Fargo CMBS % 05/11/16 210 Clay (i) Wells Fargo CMBS % 05/11/16 Curtis Center (j) CCRE & PREFG LIBOR+5.912 % (m) 10/09/16 Various (k) Prudential Insurance % 01/15/17 150 Main St. Webster Bank LIBOR+2.35 % (o) 03/30/17 23 Main Street JPMorgan CMBS % 09/01/18 Harborside Plaza 5 The Northwestern Mutual Life % 11/01/18 Insurance Co. & New York Life Insurance Co. 100 Walnut Avenue Guardian Life Insurance Co. % 02/01/19 One River Center (l) Guardian Life Insurance Co. % 02/01/19 Park Square Wells Fargo Bank N.A. LIBOR+1.872 % (n) 04/10/19 Port Imperial South 4/5 Retail American General Life & A/G PC % 12/01/21 Port Imperial South 4/5 Garage American General Life & A/G PC % 12/01/29 Total mortgages, loans payable and other obligations $ $ (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) On March 27, 2015, the Company repaid these loans at par, using borrowings on the Company's unsecured revolving credit facility. (c) On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satsfactions of its obligations. See Note 3: Recent Transactions. (d) On May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligations. See Note 3: Recent Transactions. (e) Mortgage is cross collateralized by the four properties. (f) The loan was not repaid at maturity and the Company has begun discussions with the lender regarding potential options in satisfaction of the obligation. (g) The mortgage loan originally matured on May 1, 2013. The maturity date was extended until May 1, 2015 with the same interest rate. Excess cash flow, as defined, is being held by the lender for re-leasing costs. The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity. The mortgage loan was not repaid on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan. (h) The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in August 2013. The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013. (i) The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in January 2015. (j) The Company owns a 50 percent tenants-in-common interest in the Curtis Center property. The Company’s $64.0 million loan consists of its 50 percent interest in a $102 million senior loan with a current rate of 3.480 percent at June 30, 2015 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.686 percent at June 30, 2015. The senior loan rate is based on a floating rate of one -month LIBOR plus 329 basis points and the mezzanine loan rate is based on a floating rate of one -month LIBOR plus 950 basis points. The Company has entered into LIBOR caps for the periods of the loans. The loans provide for three one -year extension options. (k) Mortgage is cross collateralized by seven properties. The Company has agreed, subject to certain conditions, to guarantee repayment of $61.1 million of the loan. (l) Mortgage is collateralized by the three properties comprising One River Center. (m) The effective interest rate includes amortization of deferred financing costs of 1.362 percent. (n) The effective interest rate includes amortization of deferred financing costs of 0.122 percent. (o) This construction loan has a maximum borrowing capacity of $28.8 million. CASH PAID FOR INTEREST AND INTEREST CAPITALIZED Cash paid for interest for the six months ended June 30, 2015 and 2014 was $ 53,353,000 and $ 61,999,000 , respectively. Interest capitalized by the Company for the six months ended June 30, 2015 and 2014 was $ 7,388,000 and $ 6,493,000 , respectively (of which these amounts included $2,314,000 and $1,953,000 for the six months ended June 30, 2015 and 2014 , respectively, for interest capitalized on the Company’s investments in unconsolidated joint ventures which were substantially in development). SUMMARY OF INDEBTEDNESS As of June 30, 2015 , the Company’s total indebtedness of $ 2,034,819,000 (weighted average interest rate of 5.67 percent) was comprised of $ 139,543,000 of variable rate mortgage debt (weighted average rate of 3.89 percent) and fixed rate debt and other obligations of $ 1,895,276,000 (weighted average rate of 5.80 percent). As of December 31, 2014 , the Company’s total indebtedness of $ 2,088,654,000 (weighted average interest rate of 5.64 percent) was comprised of $ 159,860,000 of variable rate mortgage debt (weighted average rate of 3.83 percent) and fixed rate debt and other obligations of $ 1,928,794,000 (weighted average rate of 5.79 percent).

Mack-Cali Realty, L.P's Partner

Mack-Cali Realty, L.P's Partners' Capital	6 Months Ended
	Jun. 30, 2015
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Mack-Cali Realty, L.P's Partners' Capital	10. MACK-CALI REALTY, L.P.’S PARTNERS’ CAPITAL Partners’ Capital in the accompanying consolidated financial statements relates to (a) General Partners’ capital consisting of common units in the Company held by the General Partner, and (b) Limited Partners’ capital consisting of common units held by the limited partners. Any transactions resulting in the issuance of additional common and preferred stock of the Corporation result in a corresponding issuance by the Company of an equivalent amount of common and preferred units to the Corporation. GENERAL PARTNERS’ CAPITAL REPURCHASE OF GENERAL PARTNER UNITS In September 2012 , the Corporation’s Board of Directors renewed and authorized an increase to the Corporation’s repurchase program (“Repurchase Program”). The Corporation has authorization to repurchase up to $ 150 million of its outstanding common stock under the renewed Repurchase Program, which it may repurchase from time to time in open market transactions at prevailing prices or through privately negotiated transactions. The Corporation has purchased and retired 394,625 shares of its outstanding common stock for an aggregate cost of approximately $ 11 million (all of which occurred in the year ended December 31, 2012), with a remaining authorization under the Repurchase Program of $ 139 million. Concurrent with these purchases, the Corporation sold to the Company 394,625 common units for approximately $ 11 million. DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN The Corporation has a Dividend Reinvestment and Stock Purchase Plan (the “DRIP”) which commenced in March 1999 under which approximately 5.5 million shares of the Corporation’s common stock have been reserved for future issuance. The DRIP provides for automatic reinvestment of all or a portion of a participant’s dividends from the Corporation’s shares of common stock. The DRIP also permits participants to make optional cash investments up to $ 5,000 a month without restriction and, if the Corporation waives this limit, for additional amounts subject to certain restrictions and other conditions set forth in the DRIP prospectus filed as part of the Corporation’s effective registration statement on Form S -3 filed with the SEC for the approximately 5.5 million shares of the Corporation’s common stock reserved for issuance under the DRIP. STOCK OPTION PLANS In May 2013, the Corporation established the 2013 Incentive Stock Plan (the “2013 Plan”) under which a total of 4,600,000 shares have been reserved for issuance. In May 2004, the Corporation established the 2004 Incentive Stock Plan (the “2004 Plan”) under which a total of 2,500,000 shares had been reserved for issuance. The 2004 Plan was terminated upon establishment of the 2013 Plan. No options were granted under the 2004 Plan . In September 2000, the Corporation established the 2000 Employee Stock Option Plan (“2000 Employee Plan”) and the Amended and Restated 2000 Director Stock Option Plan (“2000 Director Plan” and together with the 2000 Employee Plan, the “2000 Plans”). In May 2002, shareholders of the Corporation approved amendments to both of the 2000 Plans to increase the total shares reserved for issuance under both of the 2000 Plans from 2,700,000 to 4,350,000 shares of the Corporation’s common stock (from 2,500,000 to 4,000,000 shares under the 2000 Employee Plan and from 200,000 to 350,000 shares under the 2000 Director Plan). As the 2000 Plans expired in 2010, stock options may no longer be issued under those plans. Stock options granted under the 2000 Employee Plan became exercisable over a five -year period. All stock options granted under the 2000 Director Plan became exercisable in one year. All options were granted at the fair market value at the dates of grant and have terms of 10 years. As of June 30, 2015 and December 31, 2014 , the stock options outstanding had a weighted average remaining contractual life of approximately 9.8 and 4.9 years, respectively. On June 5, 2015, in connection with the Executive Employment Agreements, the Corporation granted options to purchase a total of 800,000 shares of the Corporation’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the Corporation’s common stock on the grant date of $17.31 per share, with 400,000 of such options vesting in three equal annual installments commencing on the first anniversary of the grant date (“Time Vesting Options”), and 400,000 of such options vesting if the Corporation’s common stock trades at or above $25.00 per share for 30 consecutive trading days while the executive is employed (“Price Vesting Options”), or on or before June 30, 2019 , subject to certain conditions. Information regarding the Corporation’s stock option plans is summarized below: Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2015 $ - Granted Outstanding at June 30, 2015 ($17.31 – $45.47) $ $ Options exercisable at June 30, 2015 Available for grant at June 30, 2015 The weighted average fair value of options granted during the three and six months ended June 30, 2015 was $ 3.06 per option. The fair value of each option grant is estimated on the date of grant using the Black-Scholes model for Time Vesting Options and the Monte Carlo method for Price Vesting Options. The following weighted average assumptions are included in the Company’s fair value calculations of stock options granted during the three and six months ended June 30, 2015: Time Vesting Price Vesting Options Options Expected life (in years) Risk-free interest rate % % Volatility % % Dividend yield % % There were no stock options exercised under all stock option plans for the six months ended June 30, 2015 and 2014 , respectively. The Corporation has a policy of issuing new shares to satisfy stock option exercises. The Company recognized stock options expense of $ 62,000 and $1,000 for the three months ended June 30, 2015 and 2014 , respectively, and $63,000 and $2,000 for the six months ended June 30, 2015 and 2014, respectively. RESTRICTED STOCK AWARDS The Corporation has issued stock awards (“Restricted Stock Awards”) to officers, certain other employees, and nonemployee members of the Board of Directors of the Corporation, which allow the holders to each receive a certain amount of shares of the Corporation’s common stock generally over a one to seven -year vesting period, of which 313,337 unvested shares were legally outstanding at June 30, 2015 . Of the Restricted Stock Awards issued to executive officers and certain other employees, 210,000 were contingent upon the Corporation meeting certain performance goals to be set by the Committee of the Corporation each year (“Performance Shares”), with the remaining based on time and service. On September 12, 2012, the Board of Directors of the Corporation granted Restricted Stock Awards totaling 319,667 shares for those executive officers in place on such date. The Restricted Stock Awards were to vest commencing January 1, 2014 and with the number of Restricted Stock Awards scheduled to be vested and earned on each vesting date on an annual basis over a five to seven year vesting schedule, with each annual vesting of each tranche of Restricted Stock Awards being subject to the attainment of annual performance targets to be set by the Committee for each year. In connection with the departure of two executive officers effective March 31, 2014, the Corporation agreed to grant and accelerate vesting of 109,667 shares of Restricted Stock Awards on April 1, 2014. In connection with the departure of the Corporation’s former p resident and c hief e xecutive o fficer effective June 30, 2015, the Corporation agreed to vest 84,000 Performance Shares and to grant and accelerate the vesting of 126,000 Performance Shares on the Separation Date. See Note 14: Commitments and Contingencies – Departure of Executive Officer. On June 5, 2015, in connection with the Executive Employment Agreements, the Corporation granted a total of 37,550.54 Restricted Stock Awards, which were valued in accordance with ASC 718 – Stock Compensation, at their fair value. These awards are scheduled to vest equally over a three -year period on each annual anniversary date of the grant date. All currently outstanding and unvested Restricted Stock Awards provided to the officers and certain other employees were issued under the 2013 Plan and 2004 Plan. Currently outstanding and unvested Restricted Stock Awards provided to directors were issued under the 2013 Plan. Information regarding the Restricted Stock Awards grant activity is summarized below: Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2015 $ Granted Vested Forfeited Outstanding at June 30, 2015 $ As of June 30, 2015 , the Company had $3.1 million of total unrecognized compensation cost related to unvested Restricted Stock Awards granted under the Corporation’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 2.0 years. PERFORMANCE SHARE UNITS/ TSR-BASED AWARDS On September 12, 2012, the Board of Directors of the Corporation approved the recommendations and ratified the determinations of the Committee with respect to new multi-year TSR based awards (the “TSR-Based Awards”) totaling 5,160 performance shares (the “TSR Performance Shares”) for those executive officers in place on such date, each TSR Performance Share evidencing the right to receive $1,000 in the Corporation’s common stock upon vesting. In accordance with the amended and restated TSR-Based Awards agreements entered into between the Corporation and those executive officers in June 2013, the TSR Performance Shares were to vest commencing December 31, 2014, with the number of TSR Performance Shares scheduled to be granted annually over the next four years. The Corporation granted 1,032 TSR Performance Shares in the year ended December 31, 2013, which were valued in accordance with ASC 718, Compensation - Stock Compensation, at their fair value, utilizing a Monte-Carlo simulation to estimate the probability of the vesting conditions being satisfied. In connection with the departure of two executive officers effective March 31, 2014, the Corporation agreed to vest 357 TSR Performance Shares and to grant and accelerate the vesting of 528 TSR Performance Shares, for which the Corporation issued 45,062 shares of Common Stock on April 2, 2014. In connection with the departure of the Corporation’s former p resident and c hief e xecutive o fficer effective June 30, 2015, the Corporation agreed to vest 675 TSR Performance Shares on the Separation Date, for which it issued 41,811 shares of common stock. See Note 14: Commitments and Contingencies – Departure of Executive Officer. On June 5, 2015, in connection with the Executive Employment Agreements, the Corporation granted a total of 112,651.64 performance share units (“PSUs”) which will vest from 0 to 150 percent of the number of PSUs granted based on the Corporation’s total shareholder return relative to a peer group of equity office REITs over a three -year performance period starting from the grant date, each PSU evidencing the right to receive a share of the Corporation’s common stock upon vesting. The PSUs are also entitled to the payment of dividend equivalents in respect of vested PSUs in the form of additional PSUs. The PSUs were valued in accordance with ASC 718, Compensation - Stock Compensation, at their fair value on the grant date, utilizing a Monte-Carlo simulation to estimate the probability of the vesting conditions being satisfied. The Corporation has reserved shares of common stock under the 2004 Plan and 2013 Plan for issuance upon vesting of the TSR Performance Shares and PSUs in accordance with the terms and conditions of the TSR-Based Awards and P SUs. DEFERRED STOCK COMPENSATION PLAN FOR DIRECTORS The Amended and Restated Deferred Compensation Plan for Directors, which commenced January 1, 1999, allows non ‑employee directors of the Corporation to elect to defer up to 100 percent of their annual retainer fee into deferred stock units. The deferred stock units are convertible into an equal number of shares of common stock upon the directors’ termination of service from the Board of Directors or a change in control of the Corporation, as defined in the plan. Deferred stock units are credited to each director quarterly using the closing price of the Corporation’s common stock on the applicable dividend record date for the respective quarter. Each participating director’s account is also credited for an equivalent amount of deferred stock units based on the dividend rate for each quarter. During the six months ended June 30, 2015 and 2014 , 10,264 and 10,245 deferred stock units were earned, respectively. As of June 30, 2015 and December 31, 2014 , there were 167,763 and 157,730 deferred stock units outstanding, respectively. LIMITED PARTNERS’ CAPITAL Common Units Certain individuals and entities own common units in the Company. A common unit and a share of Common Stock of the Corporation have substantially the same economic characteristics in as much as they effectively share equally in the net income or loss of the Company. Common unitholders (other than the General Partner) have the right to redeem their common units, subject to certain restrictions. The redemption is required to be satisfied in shares of Common Stock of the General Partner, cash, or a combination thereof, calculated as follows: one share of the General Partner’s Common Stock, or cash equal to the fair market value of a share of the General Partner’s Common Stock at the time of redemption, for each common unit. The Company, in its sole discretion, determines the form of redemption of common units (i.e., whether a common unitholder receives Common Stock of the General Partner, cash, or any combination thereof). If the Company elects to satisfy the redemption with shares of Common Stock of the General Partner as opposed to cash, the General Partner is obligated to issue shares of its Common Stock to the redeeming unitholder. Regardless of the rights described above, the common unitholders may not put their units for cash to the Company or the General Partner under any circumstances. EARNINGS PER UNIT Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. The following information presents the Company’s results for the three and six months ended June 30, 2015 and 2014 in accordance with ASC 260, Earnings Per Share: (dollars in thousands, except per unit amounts) Three Months Ended Six Months Ended June 30, June 30, Computation of Basic EPU Net income $ $ $ $ Add: Noncontrolling interest in consolidated joint ventures Net income available to common unitholders $ $ $ $ Weighted average common units Basic EPU : Net income available to common unitholders $ $ $ $ Three Months Ended Six Months Ended June 30, June 30, Computation of Diluted EPU Net income available to common unitholders $ $ $ $ Weighted average common unit Diluted EPU : Net income available to common unitholders $ $ $ $ The following schedule reconciles the units used in the basic EPU calculation to the units used in the diluted EPU calculation: (in thousands) Three Months Ended Six Months Ended June 30, June 30, Basic EPU units Add: Restricted Stock Awards Diluted EPU units Contingently issuable shares under the PSU awards and Price Vesting Options were excluded from the denominator in 2015 because the criteria had not been met for the period ended June 30, 2015. Contingently issuable shares under the TSR Performance Shares were excluded from the denominator in 2014 because the criteria had not been met for the period ended June 30, 2014. Not included in the computations of diluted EPU were 410,000 and 10,000 stock options as such securities were anti-dilutive during the periods ended June 30, 2015 and 2014 , respectively. Unvested restricted stock outstanding as of June 30, 2015 and 2014 were 103,337 and 304,816 shares, respectively. Distributions declared per common unit for each of the three month periods ended June 30, 2015 and 2014 was $0.15 per unit. Distributions declared per common unit for the six month periods ended June 30, 2015 and 2014 was $0.30 and $0.45 per unit, respectively.

Noncontrolling Interests In Con

Noncontrolling Interests In Consolidated Joint Ventures	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interests In Consolidated Joint Ventures [Abstract]
Noncontrolling Interests In Consolidated Joint Ventures	11. NONCONTROLLING INTERESTS IN CONSOLIDATED JOINT VENTURES The Company consolidates certain joint ventures in which it has ownership interests. Various entities and/or individuals hold noncontrolling interests in these ventures. The following table reflects the activity of noncontrolling interests in consolidated joint ventures for the six months ended June 30, 2015 and 2014, respectively ( dollars in thousands) : Six Months Ended June 30, Balance at January 1 $ $ Net income Increase in noncontrolling interests Balance at June 30 $ $ PARTICIPATION RIGHTS The Company’s interests in certain real estate projects ( three properties and a future development) each provide for the initial distributions of net cash flow solely to the Company, and thereafter, other parties have participation rights (“Participation Rights”) in 50 percent of the excess net cash flow remaining after the distribution to the Company of the aggregate amount equal to the sum of: (a) the Company’s capital contributions, plus (b) an IRR of 10 percent per annum.

Employee Benefit 401(k) Plans A

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	6 Months Ended
	Jun. 30, 2015
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements [Abstract]
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	12. EMPLOYEE BENEFIT 401(k) PLANS AND DEFERRED RETIREMENT COMPENSATION AGREEMENTS Employees of the Corporation, who meet certain minimum age and service requirements, are eligible to participate in the Mack-Cali Realty Corporation 401(k) Savings/Retirement Plan (the “401(k) Plan”). Eligible employees may elect to defer from one percent up to 60 percent of their annual compensation on a pre-tax basis to the 401(k) Plan, subject to certain limitations imposed by federal law. The amounts contributed by employees are immediately vested and non-forfeitable. The Corporation may make discretionary matching or profit sharing contributions to the 401(k) Plan on behalf of eligible participants in any plan year. The Corporation did not make any contributions to the 401(k) plan in the six months ended June 30, 2015. Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Corporation at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Corporation. All contributions are allocated as a percentage of compensation of the eligible participants for the Plan year. The assets of the 401(k) Plan are held in trust and a separate account is established for each participant. A participant may receive a distribution of his or her vested account balance in the 401(k) Plan in a single sum or in installment payments upon his or her termination of service with the Corporation. Total expense recognized by the Company for the 401(k) Plan for the three months ended June 30, 2015 and 2014 was zero and $27,000 , respectively, and zero and $53,000 for the six months ended June 30, 2015 and 2014, respectively. On September 12, 2012, the Board of Directors of the Corporation approved multi-year deferred retirement compensation agreements for those executive officers in place on such date (the “Deferred Retirement Compensation Agreements”). Pursuant to the Deferred Retirement Compensation Agreements, the Corporation was to make annual contributions of stock units (“Stock Units”) representing shares of the Corporation’s common stock on January 1 of each year from 2013 through 2017 into a deferred compensation account maintained on behalf of each participating executive. Vesting of each annual contribution of Stock Units was to occur on December 31 of each year, subject to continued employment. In connection with the separation from service to the Corporation of certain executive officers effective March 31, 2014, the Company agreed to make cash payments totaling $1.2 million for all vested and unvested Stock Units and future cash contributions pursuant to the Deferred Retirement Compensation Agreements. In connection with the separation from service to the Corporation of its former p resident and c hief e xecutive o fficer effective June 30, 2015, the Company agreed to make cash payments of $2.3 million on the separation date for all vested and unvested Stock Units and future cash contributions pursuant to his Deferred Retirement Compensation Agreement. Total expense recognized by the Company under the Deferred Retirement Compensation Agreements for the three months ended June 30, 2015 and 2014 was zero and $142,000 , respectively, and zero and $1.3 million for the six months ended June 30, 2015 and 2014, respectively.

Disclosure Of Fair Value Of Fin

Disclosure Of Fair Value Of Financial Instruments	6 Months Ended
	Jun. 30, 2015
Disclosure Of Fair Value Of Financial Instruments [Abstract]
Disclosure Of Fair Value Of Financial Instruments	13. DISCLOSURE OF FAIR VALUE OF FINANCIAL INSTRUMENTS The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies. However, considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize on disposition of the financial instruments at June 30, 2015 and December 31, 2014 . The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. Cash equivalents, receivables, notes receivables, accounts payable, and accrued expenses and other liabilities are carried at amounts which reasonably approximate their fair values as of June 30, 2015 and December 31, 2014 . The fair value of the Company’s long-term debt, consisting of senior unsecured notes and mortgages, loans payable and other obligations aggregated approximately $ 2,046,116,000 and $ 2,133,214,000 as compared to the book value of approximately $ 2,034,819,000 and $ 2,088,654,000 as of June 30, 2015 and December 31, 2014 , respectively. The fair value of the Company’s long-term debt was categorized as a level 3 basis (as provided by ASC 820, Fair Value Measurements and Disclosures). The fair value was estimated using a discounted cash flow analysis valuation based on the borrowing rates currently available to the Company for loans with similar terms and maturities. The fair value of the mortgage debt and the unsecured notes was determined by discounting the future contractual interest and principal payments by a market rate. Although the Company has determined that the majority of the inputs used to value its derivative financial instruments fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivative financial instruments utilize level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. As a result, the Company has determined that its derivative financial instruments valuations in their entirety are classified in level 2 of the fair value hierarchy. Disclosure about fair value of financial instruments is based on pertinent information available to management as of June 30, 2015 and December 31, 2014 . Although management is not aware of any factors that would significantly affect the fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since June 30, 2015 and current estimates of fair value may differ significantly from the amounts presented herein.

Commitments And Contingencies

Commitments And Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments And Contingencies [Abstract]
Commitments And Contingencies	14. COMMITMENTS AND CONTINGENCIES TAX ABATEMENT AGREEMENTS Pursuant to agreements with certain municipalities, the Company is required to make payments in lieu of property taxes (“PILOT”) on certain of its properties and has tax abatement agreements on other properties, as follows: The Harborside Plaza 4-A agreement with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 49.5 million. The PILOT totaled $ 247,000 and $ 247,000 for the three months ended June 30, 2015 and 2014 , respectively, and $495,000 and $495,000 for the six months ended June 30, 2015 and 2014, respectively. The Harborside Plaza 5 agreement, also with the City of Jersey City, as amended, which commenced in 2002, is for a term of 20 years. The annual PILOT is equal to two percent of Total Project Costs, as defined. Total Project Costs are $ 170.9 million. The PILOT totaled $ 854,000 and $ 854,000 for the three months ended June 30, 2015 and 2014 , respectively, and $1.7 million and $1.7 million for the six months ended June 30, 2015 and 2014, respectively. The agreement with the City of Weehawken for its Port Imperial 4/5 garage development project has a term of five years beginning when the project is substantially complete, which occurred in the third quarter of 2013. The agreement provides that real estate taxes be paid initially on the land value of the project only and allows for a phase in of real estate taxes on the value of the improvements over a five year period. The agreement with the City of Rahway for its Park Square multi-family rental property provides that real estate taxes will be partially abated, on a declining scale, for four years through 2015. At the conclusion of the above-referenced agreements, it is expected that the properties will be assessed by the municipality and be subject to real estate taxes at the then prevailing rates. LITIGATION The Company is a defendant in litigation arising in the normal course of its business activities. Management does not believe that the ultimate resolution of these matters will have a materially adverse effect upon the Company’s financial condition taken as whole. GROUND LEASE AGREEMENTS Future minimum rental payments under the terms of all non-cancelable ground leases under which the Company is the lessee, as of June 30, 2015 , are as follows: (dollars in thousands) Year Amount July 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 through 2084 Total $ Ground lease expense incurred by the Company during the three months ended June 30, 2015 and 2014 amounted to $ 102,000 and $ 102,000 , respectively, and $203,000 and $203,000 for the six months ended June 30, 2015 and 2014, respectively. ROSELAND CONTINGENT CONSIDERATION The purchase price for the Roseland Transaction included the fair value of contingent consideration pursuant to an earn-out (“Earn Out”) agreement of approximately $10 million. Since the acquisition, the Company recognized benefits related to a decline in fair value in the Earn Out liability and, as a result of the achievement of certain of the defined criteria, paid certain amounts such that the balance of the Earn Out as of June 30, 2015 was $0.9 million. Prospectively, the Earn Out liability will be remeasured at fair value quarterly until the contingency has been resolved, with any changes in fair value representing a charge or benefit directly to earnings (with no adjustment to purchase accounting). The measures of the Earn Out are based on significant inputs that are not observable in the market, which ASC 820 refers to as level 3 inputs. In addition to an appropriate discount rate, the key assumption affecting the valuation for the Roseland Assets component was the probability of occurrence of the payment events under the relevant provisions (management assumed between 92 and 99 percent for completion/start criteria and 50 percent for the tax credit/grant criteria in its initial valuation). The valuation of the TRS component includes assumptions for the risk-free rate and various other factors (i.e., stock price, dividend levels and volatility) for the Company and the relevant peer group, as defined in the Earn Out agreement. DEPARTURE OF EXECUTIVE OFFICER On November 4, 2014, the Company announced that Mitchell E. Hersh would step down as president and chief executive officer of the Corporation effective May 11, 2015 and would not stand for re-election to the Corporation’s Board of Directors (the “Board of Directors”) at the 2015 annual meeting of the Corporation’s stockholders. Pursuant to the terms of the Separation Agreement, the Company elected to extend the separation date to June 30, 2015 (the “Separation Date”). In connection with Mr. Hersh’s departure from the Corporation, the Corporation and Mr. Hersh entered into a Separation and General Release Agreement (the “Separation Agreement”) dated November 4, 2014 (the “Effective Date”). The Separation Agreement provided that Mr. Hersh’s employment with the Corporation was being terminated without cause, and further provided, pursuant to the terms of Mr. Hersh’s employment agreement, multi-year performance award agreement, TSR-based performance award agreement and deferred retirement compensation agreement, for (i) a cash payment to Mr. Hersh of $8 million, (ii) payment of the premiums for the continuation of Mr. Hersh’s health, dental and vision insurance for 48 months following the Separation Date, (iii) vesting of 210,000 shares of restricted common stock pursuant to Mr. Hersh’s multi-year performance award agreement, (iv) a cash payment equal to the sum of (X) $504,000 , plus (Y) the product of (1) 210,000 multiplied by (2) the aggregate amount of dividends on the Corporation’s common stock that were declared and paid between the Effective Date and the Separation Date in payment of accrued but unpaid dividend equivalents pursuant to his multi-year performance award agreement, (v) issuance of 41,811 shares of common stock of the Corporation (the “Deferred Shares”) pursuant to the acceleration of vesting of 675 performance shares pursuant to Mr. Hersh’s TSR-based performance award agreement, and (vi) a cash payment of $2,311,792 pursuant to Mr. Hersh’s deferred retirement compensation award agreement. All such cash amounts and Deferred Shares will be paid to Mr. Hersh on the date that is six months and one day from the Separation Date, except in the event of death or if the payment event is due to Mr. Hersh’s disability, in which case the payments will occur shortly after such death or disability. Under the terms of the Separation Agreement, Mr. Hersh continued to receive his base salary in accordance with his employment agreement and to be eligible to participate in the Corporation’s executive incentive compensation and bonus programs. In addition, upon departure Mr. Hersh was entitled to receive his accrued but unpaid base salary and to have his expenses reimbursed. The Company’s total estimated costs for the departure of the Corporation’s former president and chief executive officer and of the departure of certain of the Corporation’s executive officers of approximately $23.8 million during the year ended December 31, 2014, of which approximately $11 million was recognized during the six months ended June 30, 2014, was included in general and administrative expense (approximately $11.6 million was included in accounts payable, accrued expenses and other liabilities as of June 30, 2015 and December 31, 2014). OTHER The Company may not dispose of or distribute certain of its properties, currently comprised of seven properties with an aggregate net book value of approximately $ 124.3 million, which were originally contributed by certain unrelated common unitholders, without the express written consent of such common unitholders, as applicable, except in a manner which does not result in recognition of any built-in-gain (which may result in an income tax liability) or which reimburses the appropriate specific common unitholders for the tax consequences of the recognition of such built-in-gains (collectively, the “Property Lock-Ups”). The aforementioned restrictions do not apply in the event that the Company sells all of its properties or in connection with a sale transaction which the Corporation’s Board of Directors determines is reasonably necessary to satisfy a material monetary default on any unsecured debt, judgment or liability of the Company or to cure any material monetary default on any mortgage secured by a property. The Property Lock-Ups expire periodically through 2016 . Upon the expiration of the Property Lock-Ups, the Company is generally required to use commercially reasonable efforts to prevent any sale, transfer or other disposition of the subject properties from resulting in the recognition of built-in gain to the specific common unitholders, which include members of the Mack Group (which includes William L. Mack, Chairman of the Corporation’s Board of Directors; David S. Mack, director of the Corporation; Earle I. Mack, a former director of the Corporation; and Mitchell E. Hersh, former president, chief executive officer and director of the Corporation), the Robert Martin Group (which includes Robert F. Weinberg, a former director of the Corporation and current member of its Advisory Board), and the Cali Group (which includes John R. Cali, a former director of the Corporation and current member of its Advisory Board). 110 of the Company’s properties, with an aggregate net book value of approximately $ 1.3 billion, have lapsed restrictions and are subject to these conditions. On May 21, 2014, the Company entered into a joint venture agreement with Ironstate Harborside-A LLC (“ISA”) to form Harborside Unit A Urban Renewal, L.L.C. (“URL-Harborside”), a newly-formed joint venture that will develop, own and operate a high-rise tower of approximately 763 multi-family apartment units above a parking pedestal to be located on land contributed by the Company at its Harborside complex in Jersey City, New Jersey (the “URL Project”). The Company owns an 85 percent interest in URL-Harborside and the remaining interest is owned by ISA, with shared control over major decisions such as approval of budgets, property financings and leasing guidelines. The construction of the URL Project is estimated to cost a total of approximately $320 million (of which development costs of $128.4 million have been incurred by URL-Harborside through June 30, 2015 ). The URL Project is projected to be ready for occupancy by the fourth quarter of 2016 . The venture has a construction/permanent loan with a maximum borrowing amount of $192 million (with no balance currently outstanding as of June 30, 2015 ), which bears interest at a rate of 5.197 percent and matures in August 2029 . The Company currently expects that it will fund approximately $17.4 million of the remaining development costs of the project, net of the loan financing. In July 2012, the Company entered into a ground lease with Wegmans Food Markets, Inc. (“Wegmans”) at the Company’s undeveloped site located at Sylvan Way and Ridgedale Avenue in Hanover Township, New Jersey. Subject to receiving all necessary governmental approvals, Wegmans intends to construct a store of approximately 140,000 square feet on a finished pad scheduled to be completed in the first quarter of 2017 . The Company expects to incur costs of approximately $ 28.7 million for the development of the site (of which the Company has incurred $ 11.5 million through June 30, 2015 ). The Company owns a 76.25 percent interest in a consolidated joint venture which is constructing a 108 -unit multi-family development rental property located in Eastchester, New York (the “Eastchester Project”). The project is expected to be ready for occupancy by the second quarter of 2016 . The Eastchester Project is estimated to cost a total of $50 million (of which development costs of $18.4 million have been incurred through June 30, 2015 ). The venture has a $28.8 million construction loan (with $3.5 million outstanding as of June 30, 2015 ). The Company expects to fund $8.2 million of the remaining development costs balance. On April 1, 2015, the Company acquired vacant land to accommodate the development of the CitySquare Project for a purchase price of $3.1 million with an additional $1.25 million to be paid, subject to certain conditions, in accordance with the terms of the purchase and sale agreement. The purchase price for the acquisition was funded primarily through borrowing under the Company’s unsecured revolving credit facility. The Company is required to begin construction of the CitySquare Project within 12 months of closing. The Company plans to start construction in the third quarter 2015 and the total development costs are estimated to be approximately $91.4 million.

Tenant Leases

Tenant Leases	6 Months Ended
	Jun. 30, 2015
Tenant Leases [Abstract]
Tenant Leases	15. TENANT LEASES The Properties are leased to tenants under operating leases with various expiration dates through 2035 . Substantially all of the commercial leases provide for annual base rents plus recoveries and escalation charges based upon the tenant’s proportionate share of and/or increases in real estate taxes and certain operating costs, as defined, and the pass ‑through of charges for electrical usage. Future minimum rentals to be received under non-cancelable commercial operating leases at June 30, 2015 are as follows (dollars in thousands) : Year Amount July 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 and thereafter Total $ Multi-family rental property residential leases are excluded from the above table as they generally expire within one year .

Segment Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	16. SEGMENT REPORTING The Company operates in three business segments: (i) commercial and other real estate, (ii) multi-family real estate, and (iii) multi-family services. The Company provides leasing, property management, acquisition, development, construction and tenant-related services for its commercial and other real estate and multi-family real estate portfolio. The Company’s multi ‑family services business also provides similar services for third parties. The Company no longer considers construction services as a reportable segment as it phased out this line of business in 2014. The Company had no revenues from foreign countries recorded for the six months ended June 30, 2015 and 2014 . The Company had no long lived assets in foreign locations as of June 30, 2015 and December 31, 2014 . The accounting policies of the segments are the same as those described in Note 2: Significant Accounting Policies, excluding depreciation and amortization. The Company evaluates performance based upon net operating income from the combined properties in each of its real estate segments (commercial and other, and multi-family) and from its multi-family services segment. Selected results of operations for the three and six months ended June 30, 2015 and 2014 and selected asset information as of June 30, 2015 and December 31, 2014 regarding the Company’s operating segments are as follows. Amounts for prior periods have been restated to conform to the current period segment reporting presentation: (dollars in thousands) Real Estate Commercial Multi-family Corporate Total & Other Multi-family Services & Other (d) Company Total revenues: Three months ended: June 30, 2015 $ $ $ (e) $ $ June 30, 2014 (f) Six months ended: June 30, 2015 (g) June 30, 2014 (h) Total operating and interest expenses (a): Three months ended: June 30, 2015 $ $ $ $ $ June 30, 2014 Six months ended: June 30, 2015 June 30, 2014 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: June 30, 2015 $ $ $ $ - $ June 30, 2014 - Six months ended: June 30, 2015 - June 30, 2014 - Net operating income (loss) (b): Three months ended: June 30, 2015 $ $ $ $ $ June 30, 2014 Six months ended: June 30, 2015 June 30, 2014 Total assets: June 30, 2015 $ $ $ $ $ December 31, 2014 Total long-lived assets (c): June 30, 2015 $ $ $ $ $ December 31, 2014 Total investments in unconsolidated joint ventures: June 30, 2015 $ $ $ $ - $ December 31, 2014 - (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; direct construction costs; real estate services expenses; general and administrative and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense, construction services revenue and direct construction costs) as well as intercompany eliminations necessary to reconcile to consolidated Company totals. (e) Includes $1,556 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (f) Includes $935 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (g) Includes $2,831 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (h) Includes $1,800 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. The following schedule reconciles net operating income to net income available to common unitholders: (dollars in thousands) Three Months Ended Six Months Ended June 30, June 30, Net operating income $ $ $ $ Add (deduct): Depreciation and amortization Realized gains on disposition of rental property, net Gain on sale of investment in unconsolidated joint venture - - Net income Noncontrolling interest in consolidated joint ventures Net income available to common unitholders $ $ $ $

Significant Accounting Polici23

Significant Accounting Policies (Policy)	6 Months Ended
	Jun. 30, 2015
Significant Accounting Policies [Abstract]
Rental Property	Rental Property Rental properties are stated at cost less accumulated depreciation and amortization. Costs directly related to the acquisition, development and construction of rental properties are capitalized. Acquisition ‑related costs are expensed as incurred. Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development. Capitalized development and construction salaries and related costs approximated $ 1.2 million and $0.9 million for the three months ended June 30, 2015 and 2014 , respectively, and $2.5 million and $1.8 million for the six months ended June 30, 2015 and 2014, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $ 83.2 million and $ 62.8 million as of June 30, 2015 and December 31, 2014 , respectively. Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives. Fully-depreciated assets are removed from the accounts. The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of tenant improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup). If portions of a rental project are substantially completed and occupied by tenants, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project. The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative square footage of each portion, and capitalizes only those costs associated with the portion under construction. Properties are depreciated using the straight-line method over the estimated useful lives of the assets. The estimated useful lives are as follows: Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below market leases, (ii) in-place leases and (iii) tenant relationships. The Company allocates the purchase price to the assets acquired and liabilities assumed based on their fair values. The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed exceed the purchase consideration of a transaction. In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information. The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases. Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant. Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions. In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses. Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals. The value of in-place leases are amortized to expense over the remaining initial terms of the respective leases. The value of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired. In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment. The criteria considered by management include reviewing low leased percentages, significant near-term lease expirations, recently acquired properties, current and historical operating and/or cash flow losses, near-term mortgage debt maturities or other factors that might impact the Company’s intent and ability to hold the property. A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property is less than the carrying value of the property. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the property over the fair value of the property. The Company’s estimates of aggregate future cash flows expected to be generated by each property are based on a number of assumptions. These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions. The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and costs to operate each property. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future.
Rental Property Held For Sale	Rental Property Held for Sale When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of selling costs, of such assets. If, in management’s opinion, the estimated net sales price of the assets which have been identified as held for sale is less than the net book value of the assets, a valuation allowance is established. If circumstances arise that previously were considered unlikely and, as a result, the Company decides not to sell a property previously classified as held for sale, the property is reclassified as held and used. A property that is reclassified is measured and recorded individually at the lower of (a) its carrying amount before the property was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the property been continuously classified as held and used, or (b) the fair value at the date of the subsequent decision not to sell.
Investments In Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures The Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting. The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions. The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed. Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee. If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses. On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired. An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the value of the investment. The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs. As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future . See Note 4: Investments in Unconsolidated Joint Ventures.
Cash And Cash Equivalents	Cash and Cash Equivalents All highly liquid investments with a maturity of three months or less when purchased are considered to be cash equivalents.
Deferred Financing Costs	Deferred Financing Costs Costs incurred in obtaining financing are capitalized and amortized over the term of the related indebtedness. Amortization of such costs is included in interest expense and was $ 948,000 and $ 759,000 for the three months ended June 30, 2015 and 2014 , respectively, and $1,901,000 and $1,528,000 for the six months ended June 30, 2015 and 2014 , respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (loss) from early extinguishment of debt. No such unamortized costs were written off for the six months ended June 30, 2015 and 2014.
Deferred Leasing Costs	Deferred Leasing Costs Costs incurred in connection with commercial leases are capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization. Unamortized deferred leasing costs are charged to amortization expense upon early termination of the lease. Certain employees of the Corporation are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which is capitalized and amortized, approximated $ 846,000 and $ 845,000 for the three months ended June 30, 2015 and 2014 , respectively, and $1,816,000 and $1,876,000 for the six months ended June 30, 2015 and 2014 , respectively.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable. Each of the Company’s segments consists of a reporting unit. Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable. In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying amount, then performing the additional two-step impairment test is unnecessary. If the carrying amount of goodwill exceeds its fair value, an impairment charge is recognized.
Derivative Instruments	Derivative Instruments The Company measures derivative instruments, including certain derivative instruments embedded in other contracts, at fair value and records them as an asset or liability, depending on the Company’s rights or obligations under the applicable derivative contract. For derivatives designated and qualifying as fair value hedges, the changes in the fair value of both the derivative instrument and the hedged item are recorded in earnings. For derivatives designated as cash flow hedges, the effective portions of the derivative are reported in other comprehensive income (“OCI”) and are subsequently reclassified into earnings when the hedged item affects earnings. Changes in fair value of derivative instruments not designated as hedging and ineffective portions of hedges are recognized in earnings in the affected period.
Revenue Recognition	Revenue Recognition Base rental revenue is recognized on a straight-line basis over the terms of the respective leases. Unbilled rents receivable represents the cumulative amount by which straight-line rental revenue exceeds rents currently billed in accordance with the lease agreements. Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed-rate renewal options for below-market leases. The capitalized above-market lease values for acquired properties are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed-rate renewal options of the respective leases. Escalations and recoveries from tenants are received from tenants for certain costs as provided in the lease agreements. These costs generally include real estate taxes, utilities, insurance, common area maintenance and other recoverable costs. See Note 15: Tenant Leases. Real estate services revenue includes property management, development, construction and leasing commission fees and other services, and payroll and related costs reimbursed from clients. Fee income derived from the Company’s unconsolidated joint ventures (which are capitalized by such ventures) are recognized to the extent attributable to the unaffiliated ownership interests. Parking income includes income from parking spaces leased to tenants and others. Other income includes income from tenants for additional services arranged for by the Company and income from tenants for early lease terminations.
Allowance For Doubtful Accounts	Allowance for Doubtful Accounts Management performs a detailed review of amounts due from tenants to determine if an allowance for doubtful accounts is required based on factors affecting the collectability of the accounts receivable balances. The factors considered by management in determining which individual tenant receivable balances, or aggregate receivable balances, require a collectability allowance include the age of the receivable, the tenant’s payment history, the nature of the charges, any communications regarding the charges and other related information. Management’s estimate of the allowance for doubtful accounts requires management to exercise significant judgment about the timing, frequency and severity of collection losses, which affects the allowance and net income.
Income And Other Taxes	Income and Other Taxes The Company is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns. Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements. Certain of the Company’s corporate subsidiaries are taxable REIT subsidiaries (each a “TRS”). In general, a TRS may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated). A TRS is subject to corporate federal income tax. The Company has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters. As of June 30, 2015 , the Company had a deferred tax asset related to its TRS activity with a balance of approximately $ 15.3 million which has been fully reserved for through a valuation allowance. If the Corporation fails to qualify as a REIT in any taxable year, the Corporation will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates. The Corporation is subject to certain state and local taxes. Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment. The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense. In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable. As of June 30, 2015 , the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2010 forward.
Earnings Per Unit	Earnings Per Unit The Company presents both basic and diluted earnings per unit (“EPU”). Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period. Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount from continuing operations amount. Units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable units included in diluted EPU shall be based on the number of units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable units shall be included in the denominator of diluted EPU as of the beginning of the period (or as of the date of the grant, if later).
Distributions Payable	Distributions Payable The distributions payable at June 30, 2015 represents distributions payable to common unitholders ( 100,101,735 units) for all such holders of record as of July 6, 2015 with respect to the second quarter 2015 . The second quarter 2015 common unit distributions of $ 0.15 per common unit were approved by the Corporation’s Board of Directors on May 11, 2015 and paid on July 14, 2015 . The distributions payable at December 31, 2014 represents distributions payable to common unitholders ( 99,950,528 units), for all such holders of record as of January 6, 2015 with respect to the fourth quarter 2014 . The fourth quarter 2014 common unit distributions of $ 0.15 per common unit were approved by the Corporation’s Board of Directors on December 9, 2014 and paid on January 14, 2015 .
Costs Incurred For Stock Issuances	Costs Incurred For Stock Issuances Costs incurred in connection with the Corporation’s stock issuances are reflected as a reduction of General Partner’s capital.
Stock Compensation	Stock Compensation The Company accounts for stock compensation in accordance with the provisions of ASC 718, Compensation-Stock Compensation. These provisions require that the estimated fair value of restricted stock (“Restricted Stock Awards”) , restricted stock units (“RSUs”), performance share units (“PSUs”), total stockholder return based performance shares (“TSR”) and stock options at the grant date be amortized ratably into expense over the appropriate vesting period. The Company recorded stock compensation expense of $ 492,000 and $ 877,000 for the three months ended June 30, 2015 and 2014 , respectively, and $805,000 and $4,264,000 for the six months ended June 30, 2015 and 2014, respectively. The amount for the six months ended June 30, 2014 included $3,203,000 related to the departure of certain executive officers.
Other Comprehensive Income	Other Comprehensive Income Other comprehensive income (loss), if any, includes items that are recorded in equity, such as unrealized holding gains or losses on marketable securities available for sale. There was no difference in other comprehensive income to net income for the three and six months ended June 30, 2015 and 2014 , and no accumulated other comprehensive income as of June 30, 2015 and December 31, 2014 .
Fair Value Hierarchy	Fair Value Hierarchy The standard Fair Value Measurements specifies a hierarchy of valuation techniques based upon whether the inputs to those valuation techniques reflect assumptions other market participants would use based upon market data obtained from independent sources (observable inputs). The following summarizes the fair value hierarchy: · Level 1: Quoted prices in active markets that are unadjusted and accessible at the measurement date for identical, unrestricted assets or liabilities; · Level 2: Quoted prices for identical assets and liabilities in markets that are inactive, quoted prices for similar assets and liabilities in active markets or financial instruments for which significant inputs are observable, either directly or indirectly, such as interest rates and yield curves that are observable at commonly quoted intervals and · Level 3: Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.
Discontinued Operations	Discontinued Operations In April 2014, the Financial Accounting Standards Board (“ FASB ”) issued guidance related to the reporting of discontinued operation and disclosures of disposals of components of an entity. This guidance defines a discontinued operation as a component or group of components disposed or classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and final result; the guidance states that a strategic shift could include a disposal of a major geographical area of operations, a major line of business, a major equity method investment or other major parts of an entity. The guidance also provides for additional disclosure requirements in connection with both discontinued operations and other dispositions not qualifying as discontinued operations. The guidance is effective for all companies for annual and interim periods beginning on or after December 15, 2014. The guidance applies prospectively to new disposals and new classifications of disposal groups as held for sale after the effective date. All entities could early adopt the guidance for new disposals (or new classifications as held for sale) that had not been reported in financial statements previously issued or available for issuance. The Company elected to early adopt this standard effective with the interim period beginning January 1, 2014. Prior to January 1, 2014, properties identified as held for sale and/or disposed of were presented in discontinued operations for all periods presented.
Impact Of Recently-Issued Accounting Standards	Impact Of Recently-Issued Accounting Standards In May 2014, the FASB issued Accounting Standards Update (“ASU”) 2014-09 Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”). ASU 2014-09 is a comprehensive new revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. In adopting ASU 2014-09, companies may use either a full retrospective or a modified retrospective approach. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. ASU 2014-09 is effective for the first interim period within annual reporting periods beginning after December 15, 2017, and early adoption is permitted for periods beginning after December 15, 2016. The Company is currently in the process of evaluating the impact the adoption of ASU 2014-09 will have on the Company’s financial position or results of operations. In June 2014, the FASB issued ASU 2014-12 Compensation—Stock Compensation (Topic 718) - Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period (“ASU 2014-12”). The amendments in ASU 2014-12 apply to all reporting entities that grant their employees share-based payments in which the terms of the award provide that a performance target that affects vesting could be achieved after the requisite service period. That is, the employee would be eligible to vest in the award regardless of whether the employee is rendering service on the date the performance target is achieved. Current GAAP does not contain explicit guidance on how to account for those share-based payments. ASU 2014-12 is intended to resolve the accounting treatment of such awards. The amendments in ASU 2014-12 are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015 with early adoption permitted. The Company is currently in the process of evaluating the impact the adoption of ASU 2014-12 will have on the Company’s financial position or results of operations. In August 2014, the FASB issued ASU 2014-15, which requires management to evaluate whether there are conditions or events that raise substantial doubt about the entity’s ability to continue as a going concern, and to provide certain disclosures when it is probable that the entity will be unable to meet its obligations as they become due within one year after the date that the financial statements are issued. ASU 2014-15 is effective for the annual period ended December 31, 2016 and for annual periods and interim periods thereafter with early adoption permitted. The adoption of ASU 2014-15 is not expected to materially impact the Company’s consolidated financial statements. In February 2015, the FASB issued ASU 2015-02, Consolidation–Amendments to the Consolidation Analysis (Topic 810) (“ASU 2015-02”). ASU 2015-02 updates guidance related to accounting for consolidation of certain limited partnerships. ASU 2015-02 does not add or remove any of the five characteristics that determine if an entity is a VIE; however, it changes the manner in which a reporting entity assesses its ability to make decisions about the entity's activities. Additionally, ASU 2015-02 removes three of the six criteria that must be met for a fee arrangement to not be a VIE and modifies how an entity assesses interests held through related parties. ASU 2015-02 is effective for fiscal years and interim periods within those years beginning after December 15, 2015, with early adoption permitted. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements when adopted. In April 2015, the FASB issued ASU 2015-03, Interest–Imputation of Interest-Simplifying the Presentation of Debt Issuance Costs (Subtopic 835-30) (“ASU 2015-03”). ASU 2015-03 requires debt issuance costs related to a recognized debt liability paid to third parties other than the lender to be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption of this guidance is permitted for financial statements that have not been previously issued, and an entity should apply the new guidance on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. The Company is currently evaluating the impact this guidance will have on its consolidated financial statements when adopted.

Significant Accounting Polici24

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2015
Significant Accounting Policies [Abstract]
Estimated Useful Lives Of Assets	Leasehold interests Remaining lease term Buildings and improvements 5 to 40 years Tenant improvements The shorter of the term of the related lease or useful life Furniture, fixtures and equipment 5 to 10 years

Recent Transactions (Tables)

Recent Transactions (Tables)	6 Months Ended
	Jun. 30, 2015
Recent Transactions [Abstract]
Summary Of Income From Properties Disposed	Three Months Ended Six Months Ended June 30, June 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest income Income from properties disposed of $ $ $ $ Realized gains on dispositions Total income from properties disposed of $ $ $ $

Investments In Unconsolidated26

Investments In Unconsolidated Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Summary Of Unconsolidated Joint Ventures	Property Debt Number of Company's Carrying Amount As of June 30, 2015 Apartment Units Effective June 30, December 31, Maturity Interest Entity / Property Name or Square Feet (sf) Ownership % (a) Balance Date Rate Multi-family Marbella RoseGarden, L.L.C./ Marbella (b) units % $ $ $ 05/01/18 % RoseGarden Monaco Holdings, L.L.C./ Monaco (b) units % 02/01/21 % Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station (c) units % - - - - PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial (b) units % - - 09/01/20 % Rosewood Morristown, L.L.C. / Metropolitan at 40 Park (d) (e) units % (f) (f) Overlook Ridge JV 2C/3B, L.L.C./The Chase at Overlook Ridge (b) units % 12/26/15 L+2.50 % (g) PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial (b) units % 07/15/21 % (h) Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C) (b) units % - - 03/01/30 % (i) Crystal House Apartments Investors LLC / Crystal House (j) units % 04/01/20 % Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7 (b) units % 12/04/15 L+2.50 % (k) PruRose Port Imperial South 13, LLC / RiverParc at Port Imperial (b) units % 06/27/16 L+2.15 % (l) Roseland/Port Imperial Partners, L.P./ Riverwalk C (b) (m) units % - - - RoseGarden Marbella South, L.L.C./ Marbella II units % 03/30/17 L+2.25 % (n) Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B) (b) units % - - 03/01/30 % (o) Riverpark at Harrison I, L.L.C./ Riverpark at Harrison units % 06/27/16 L+2.35 % (p) Capitol Place Mezz LLC / Station Townhouses units % 07/01/33 % (q) Harborside Unit A Urban Renewal, L.L.C. / URL Harborside units % - 08/01/29 % (r) RoseGarden Monaco, L.L.C./ San Remo Land potential units % - - - Grand Jersey Waterfront URA, L.L.C./ Liberty Landing potential units % - - - Office Red Bank Corporate Plaza, L.L.C./ Red Bank sf % 05/17/16 L+3.00 % (s) 12 Vreeland Associates, L.L.C./ 12 Vreeland Road sf % 07/01/23 % BNES Associates III / Offices at Crystal Lake sf % 11/01/23 % Hillsborough 206 Holdings, L.L.C./ Hillsborough 206 sf % - - - KPG-P 100 IMW JV, LLC / 100 Independence Mall West sf % - 09/09/16 L+7.00 % (t) Keystone-Penn sf (u) - - (v) (v) Keystone-TriState sf (w) (x) (x) KPG-MCG Curtis JV, L.L.C./ Curtis Center (y) sf % (z) (z) (z) Other Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations) sf % - - - Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial (b) sf % - - - South Pier at Harborside / Hyatt Regency Jersey City on the Hudson rooms % (aa) (aa) (ab) (ab) Stamford SM LLC / Senior Mezzanine Loan (ac) n/a n/a % - - - - - Other (ad) - - - Totals: $ $ $ (a) Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable. (b) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term. (c) See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures. (d) Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 25 percent interest in a to-be-built 59 -unit, five story multi-family rental development property ("Lofts at 40 Park"). (e) The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the payment of the outstanding balance remaining on a note ($975 as of June 30, 2015), and is not expected to meaningfully participate in the venture's cash flows in the near term. (f) Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600 , bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015 ; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500 , bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117 , bears interest at LIBOR plus 250 basis points and matures in September 2015 . The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved. (g) The construction loan has a maximum borrowing amount of $55,500 and provides, subject to certain conditions, two one -year extension options with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 3.0875 percent per annum on an initial notional amount of $1,840 , increasing to $52,000 , for the period from September 3, 2013 to November 2, 2015. (h) The permanent loan has a maximum borrowing amount of $80,249 . (i) The construction loan with a maximum borrowing amount of $91,000 converted to a permanent loan on February 27, 2015. (j) The Company also owns a 50 percent interest in a vacant land to accommodate the development of approximately 295 additional units of which 252 are currently approved. (k) The construction loan has a maximum borrowing amount of $42,500 and provides, subject to certain conditions, two two-year extension options with a fee of 12.5 basis points for the first two -year extension and 25 basis points for the second two -year extension. (l) The construction loan has a maximum borrowing amount of $73,350 and provides, subject to certain conditions, one -year extension option followed by a six -month extension option with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 2.79 percent per annum on an initial notional amount of $1,620 , increasing to $69,500 for the period from July 1, 2013 to January 1, 2016. (m) The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J ("Port Imperial North Land") that can accommodate the development of 836 apartment units. (n) The construction loan has a maximum borrowing amount of $77,400 and provides, subject to certain conditions, two one -year extension options with a fee of 25 basis points for each year. (o) The construction loan with a maximum borrowing amount of $57,000 converted to a permanent loan on February 27, 2015. (p) The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one -year extension options with a fee of 20 basis points for each year. (q) The construction/permanent loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017. (r) The construction/permanent loan has a maximum borrowing amount of $192,000 . (s) The joint venture has a swap agreement that fixes the all-in rate to 3.99375 percent per annum on an initial notional amount of $13,650 and then adjusting in accordance with an amortization schedule, which is effective from October 17, 2011 through loan maturity. (t) The mortgage loan has two one -year extension options, subject to certain conditions, and includes a $25 million construction escrow with a balance of $5.7 million to be drawn at June 30, 2015. (u) The Company’s equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally. (v) Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023 ; principal balance of $69,320 bears interest at rates ranging from LIBOR+5.0 percent to LIBOR+5.75 percent and matures in August 27, 2016 ; principal balance of $10,425 bears interest at LIBOR+6.0 percent matures in August 27, 2015 . (w) Includes the Company’s pari-passu interests of $4.5 million in five properties and Company’s subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally. (x) Principal balance of $41,848 bears interest at 4.95 percent and matures on July 1, 2017 ; principal balance of $71,724 bears interest at rates ranging from 5.65 percent to 6.75 percent and matures on September 9, 2017 ; principal balance of $14,250 bears interest at 4.88 percent and matures on July 6, 2024 ; principal balance of $63,400 bears interest at 4.93 percent and matures on July 6, 2044 ; principal balance of $15,050 bears interest at 4.71 percent and matures on August 6, 2044 . (y) Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. (z) See Note 9: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets. (aa) The negative carrying amount for this venture of $2,570 and $1,854 as of June 30, 2015 and December 31, 2014, respectively, were included in accounts payable, accrued expenses and other liabilities. (ab) Balance includes: (i) mortgage loan, collateralized by the hotel property, with a balance of $60,844 , bears interest at 6.15 percent and matures in November 2016 , and (ii) loan with a balance of $4,124 , bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020 . The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner. (ac) The joint venture collected net proceeds of $47.2 million at maturity, of which the Company received its share of $37.8 million on August 6, 2014. (ad) The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term.
Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures	Three Months Ended Six Months Ended June 30, June 30, Entity / Property Name Multi-family Marbella RoseGarden, L.L.C./ Marbella $ $ $ $ RoseGarden Monaco Holdings, L.L.C./ Monaco Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station - PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial - - - - Rosewood Morristown, L.L.C. / Metropolitan at 40 Park Overlook Ridge JV 2C/3B, L.L.C./The Chase at Overlook Ridge - PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C) - - Crystal House Apartments Investors LLC / Crystal House Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7 PruRose Port Imperial South 13, LLC / RiverParc at Port Imperial Roseland/Port Imperial Partners, L.P./ Riverwalk C RoseGarden Marbella South, L.L.C./ Marbella II - - - - Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B) - - - Riverpark at Harrison I, L.L.C./ Riverpark at Harrison - - Capitol Place Mezz LLC / Station Townhouses - - Harborside Unit A Urban Renewal, L.L.C. / URL Harborside - - RoseGarden Monaco, L.L.C./ San Remo Land - - - - Grand Jersey Waterfront URA, L.L.C./ Liberty Landing - Office Red Bank Corporate Plaza, L.L.C./ Red Bank 12 Vreeland Associates, L.L.C./ 12 Vreeland Road BNES Associates III / Offices at Crystal Lake Hillsborough 206 Holdings, L.L.C./ Hillsborough 206 - KPG-P 100 IMW JV, LLC / 100 Independence Mall West Keystone-Penn - - - - Keystone-TriState - - KPG-MCG Curtis JV, L.L.C./ Curtis Center Other Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations) Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial South Pier at Harborside / Hyatt Regency Jersey City on the Hudson Stamford SM LLC / Senior Mezzanine Loan - - Other Company's equity in earnings (loss) of unconsolidated joint ventures $ $ $ $
Summary Of Financial Position Of Unconsolidated Joint Ventures	June 30, December 31, Assets: Rental property, net $ $ Other assets Total assets $ $ Liabilities and partners'/ members' capital: Mortgages and loans payable $ $ Other liabilities Partners'/members' capital Total liabilities and partners'/members' capital $ $
Summary Of The Results Of Operations Of Unconsolidated Joint Ventures	Three Months Ended Six Months Ended June 30, June 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest expense Net loss $ $ $ $

Deferred Charges, Goodwill An27

Deferred Charges, Goodwill And Other Assets, Net (Tables)	6 Months Ended
	Jun. 30, 2015
Deferred Charges, Goodwill And Other Assets, Net [Abstract]
Schedule Of Deferred Charges, Goodwill And Other Assets	June 30, December 31, (dollars in thousands) Deferred leasing costs $ $ Deferred financing costs Accumulated amortization Deferred charges, net Notes receivable (a) In-place lease values, related intangibles and other assets, net Goodwill Prepaid expenses and other assets, net Total deferred charges, goodwill and other assets, net $ $ (a) Includes as of June 30, 2015 : a mortgage receivable for $ 10.4 million which bears interest at LIBOR plus six percent and matures in August 2016 ; and an interest-free note receivable with a net present value of $ 3.2 million and matures in April 2023 . The Company believes these balances are fully collectible.
Summary Of Notional Fair Value Of Derivative Financial Instruments	Fair Value Notional Strike Effective Expiration June 30, December 31, Value (a) Rate Date Date LIBOR Cap $ % September 2014 October 2015 $ - $ LIBOR Cap % September 2014 October 2015 - LIBOR Cap % October 2015 October 2016 LIBOR Cap % October 2015 October 2016 $ $ (a) The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks.

Restricted Cash (Tables)

Restricted Cash (Tables)	6 Months Ended
	Jun. 30, 2015
Restricted Cash [Abstract]
Schedule Of Restricted Cash	June 30, December 31, Security deposits $ $ Escrow and other reserve funds Total restricted cash $ $

Senior Unsecured Notes (Tables)

Senior Unsecured Notes (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Summary Of Senior Unsecured Notes	June 30, December 31, Effective Rate (1) 5.800% Senior Unsecured Notes, due January 15, 2016 $ $ % 2.500% Senior Unsecured Notes, due December 15, 2017 % 7.750% Senior Unsecured Notes, due August 15, 2019 % 4.500% Senior Unsecured Notes, due April 18, 2022 % 3.150% Senior Unsecured Notes, due May 15, 2023 % Total senior unsecured notes $ $ (1) Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.

Unsecured Revolving Credit Fa30

Unsecured Revolving Credit Facility (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Change In The Operating Partnership's Unsecured Debt Ratings	Operating Partnership's Interest Rate - Unsecured Debt Ratings: Applicable Basis Points Facility Fee Higher of S&P or Moody's Above LIBOR Basis Points No ratings or less than BBB-/Baa3 BBB- or Baa3 (current) BBB or Baa2 BBB+ or Baa1 A- or A3 or higher

Mortgages, Loans Payable And 31

Mortgages, Loans Payable And Other Obligations (Tables)	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Summary Of Mortgages, Loans Payable And Other Obligations	Effective June 30, December 31, Property Name Lender Rate (a) Maturity Overlook - Site IIID,IIIC, IIIA (b) Wells Fargo Bank N.A. LIBOR+3.50 % - $ Overlook - Site IIB (Quarrystone I) (b) Wells Fargo Bank N.A. LIBOR+2.50 % - 4 Sylvan (c) Wells Fargo CMBS % - 10 Independence (d) Wells Fargo CMBS % - 6 Becker, 85 Livingston, Wells Fargo CMBS % $ 08/11/14 (f) 75 Livingston & 20 Waterview (e) 9200 Edmonston Road Principal Commercial Funding L.L.C. % 05/01/15 (g) Port Imperial South Wells Fargo Bank N.A. LIBOR+1.75 % 09/19/15 4 Becker Wells Fargo CMBS % 05/11/16 5 Becker (h) Wells Fargo CMBS % 05/11/16 210 Clay (i) Wells Fargo CMBS % 05/11/16 Curtis Center (j) CCRE & PREFG LIBOR+5.912 % (m) 10/09/16 Various (k) Prudential Insurance % 01/15/17 150 Main St. Webster Bank LIBOR+2.35 % (o) 03/30/17 23 Main Street JPMorgan CMBS % 09/01/18 Harborside Plaza 5 The Northwestern Mutual Life % 11/01/18 Insurance Co. & New York Life Insurance Co. 100 Walnut Avenue Guardian Life Insurance Co. % 02/01/19 One River Center (l) Guardian Life Insurance Co. % 02/01/19 Park Square Wells Fargo Bank N.A. LIBOR+1.872 % (n) 04/10/19 Port Imperial South 4/5 Retail American General Life & A/G PC % 12/01/21 Port Imperial South 4/5 Garage American General Life & A/G PC % 12/01/29 Total mortgages, loans payable and other obligations $ $ (a) Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable. (b) On March 27, 2015, the Company repaid these loans at par, using borrowings on the Company's unsecured revolving credit facility. (c) On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satsfactions of its obligations. See Note 3: Recent Transactions. (d) On May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligations. See Note 3: Recent Transactions. (e) Mortgage is cross collateralized by the four properties. (f) The loan was not repaid at maturity and the Company has begun discussions with the lender regarding potential options in satisfaction of the obligation. (g) The mortgage loan originally matured on May 1, 2013. The maturity date was extended until May 1, 2015 with the same interest rate. Excess cash flow, as defined, is being held by the lender for re-leasing costs. The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity. The mortgage loan was not repaid on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan. (h) The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in August 2013. The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013. (i) The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in January 2015. (j) The Company owns a 50 percent tenants-in-common interest in the Curtis Center property. The Company’s $64.0 million loan consists of its 50 percent interest in a $102 million senior loan with a current rate of 3.480 percent at June 30, 2015 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.686 percent at June 30, 2015. The senior loan rate is based on a floating rate of one -month LIBOR plus 329 basis points and the mezzanine loan rate is based on a floating rate of one -month LIBOR plus 950 basis points. The Company has entered into LIBOR caps for the periods of the loans. The loans provide for three one -year extension options. (k) Mortgage is cross collateralized by seven properties. The Company has agreed, subject to certain conditions, to guarantee repayment of $61.1 million of the loan. (l) Mortgage is collateralized by the three properties comprising One River Center. (m) The effective interest rate includes amortization of deferred financing costs of 1.362 percent. (n) The effective interest rate includes amortization of deferred financing costs of 0.122 percent. (o) This construction loan has a maximum borrowing capacity of $28.8 million.

Mack-Cali Realty, L.P's Partn32

Mack-Cali Realty, L.P's Partners' Capital (Tables)	6 Months Ended
	Jun. 30, 2015
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Schedule Of Stock Option Plans	Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2015 $ - Granted Outstanding at June 30, 2015 ($17.31 – $45.47) $ $ Options exercisable at June 30, 2015 Available for grant at June 30, 2015
Schedule Of Weighted Average Assumptions	Time Vesting Price Vesting Options Options Expected life (in years) Risk-free interest rate % % Volatility % % Dividend yield % %
Schedule Of Restricted Stock Awards	Weighted-Average Grant – Date Shares Fair Value Outstanding at January 1, 2015 $ Granted Vested Forfeited Outstanding at June 30, 2015 $
Schedule Of Basic And Diluted Earnings Per Unit	Three Months Ended Six Months Ended June 30, June 30, Computation of Basic EPU Net income $ $ $ $ Add: Noncontrolling interest in consolidated joint ventures Net income available to common unitholders $ $ $ $ Weighted average common units Basic EPU : Net income available to common unitholders $ $ $ $ Three Months Ended Six Months Ended June 30, June 30, Computation of Diluted EPU Net income available to common unitholders $ $ $ $ Weighted average common unit Diluted EPU : Net income available to common unitholders $ $ $ $ The following schedule reconciles the units used in the basic EPU calculation to the units used in the diluted EPU calculation: (in thousands) Three Months Ended Six Months Ended June 30, June 30, Basic EPU units Add: Restricted Stock Awards Diluted EPU units

Noncontrolling Interest In Cons

Noncontrolling Interest In Consolidated Joint Ventures (Tables)	6 Months Ended
	Jun. 30, 2015
Noncontrolling Interests In Consolidated Joint Ventures [Abstract]
Schedule Of Activity Of Noncontrolling Interests	Six Months Ended June 30, Balance at January 1 $ $ Net income Increase in noncontrolling interests Balance at June 30 $ $

Commitments And Contingencies (

Commitments And Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
Commitments And Contingencies [Abstract]
Future Minimum Rental Payments Of Ground Leases	Year Amount July 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 through 2084 Total $

Tenant Leases (Tables)

Tenant Leases (Tables)	6 Months Ended
	Jun. 30, 2015
Tenant Leases [Abstract]
Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases	Year Amount July 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 and thereafter Total $

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Schedule Of Segment Reporting Information, By Segment	Real Estate Commercial Multi-family Corporate Total & Other Multi-family Services & Other (d) Company Total revenues: Three months ended: June 30, 2015 $ $ $ (e) $ $ June 30, 2014 (f) Six months ended: June 30, 2015 (g) June 30, 2014 (h) Total operating and interest expenses (a): Three months ended: June 30, 2015 $ $ $ $ $ June 30, 2014 Six months ended: June 30, 2015 June 30, 2014 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: June 30, 2015 $ $ $ $ - $ June 30, 2014 - Six months ended: June 30, 2015 - June 30, 2014 - Net operating income (loss) (b): Three months ended: June 30, 2015 $ $ $ $ $ June 30, 2014 Six months ended: June 30, 2015 June 30, 2014 Total assets: June 30, 2015 $ $ $ $ $ December 31, 2014 Total long-lived assets (c): June 30, 2015 $ $ $ $ $ December 31, 2014 Total investments in unconsolidated joint ventures: June 30, 2015 $ $ $ $ - $ December 31, 2014 - (a) Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; direct construction costs; real estate services expenses; general and administrative and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods. (b) Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period. (c) Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill. (d) Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense, construction services revenue and direct construction costs) as well as intercompany eliminations necessary to reconcile to consolidated Company totals. (e) Includes $1,556 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (f) Includes $935 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (g) Includes $2,831 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (h) Includes $1,800 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. The following schedule reconciles net operating income to net income available to common unitholders: (dollars in thousands) Three Months Ended Six Months Ended June 30, June 30, Net operating income $ $ $ $ Add (deduct): Depreciation and amortization Realized gains on disposition of rental property, net Gain on sale of investment in unconsolidated joint venture - - Net income Noncontrolling interest in consolidated joint ventures Net income available to common unitholders $ $ $ $

Organization And Basis Of Pre37

Organization And Basis Of Presentation (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015USD ($)ft²statepropertyitem	Dec. 31, 2014USD ($)
Real Estate Properties [Line Items]
Percentage of ownership interest	89.00%	88.90%
Number of properties owned or investment interests	279
Aggregate square feet of the property owned or investment interest | ft²	30,500,000
Number of states where properties are located | state	7
Consolidated joint ventures, total real estate assets | $	$ 247.3	$ 242.9
Consolidated joint ventures, mortgages | $	96.9	94.3
Consolidated joint ventures, other liabilities | $	$ 16.6	$ 15.7
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	260
Number of tenants | item	2,000
Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	19
Number of units | item	5,644
Office And Office/Flex Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	245
Aggregate square feet of the property owned or investment interest | ft²	30,000,000
Industrial/Warehouse Facilities [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	6
Aggregate square feet of the property owned or investment interest | ft²	387,400
Unconsolidated Joint Venture Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	13
Number of units | item	4,343
Unconsolidated Joint Venture Office Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	36
Aggregate square feet of the property owned or investment interest | ft²	5,600,000
Parking/Retail [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	5
Aggregate square feet of the property owned or investment interest | ft²	121,500
Unconsolidated Joint Venture Parking/Retail Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	2
Aggregate square feet of the property owned or investment interest | ft²	81,500
Unconsolidated Joint Venture Hotel [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	1
Number of units | item	350
Land [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	3

Significant Accounting Polici38

Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Jul. 06, 2015	Jan. 06, 2015
Significant Accounting Policies [Line Items]
Capitalized development and construction salaries and other related costs	$ 1,200,000	$ 900,000	$ 2,500,000	$ 1,800,000
Construction, tenant improvement, and development in-progress	83,200,000		$ 83,200,000		$ 62,800,000
Maximum period after cessation of major construction activity that projects are considered complete			1 year
Threshold of investment value for discontinuation of equity method accounting	0		$ 0
Amortization of deferred financing costs	948,000	759,000	1,901,000	1,528,000
Write off of unamortized deferred financing costs			0	0
Deferred leasing costs	846,000	845,000	1,816,000	1,876,000
Provision or benefit for income taxes			0
Deferred tax asset	15,300,000		$ 15,300,000
General and limited partners common capital account units outstanding						100,101,735	99,950,528
Distributions payable, record date			Jul. 6, 2015		Jan. 6, 2015
Common unit distributions per common unit, declared			$ 0.15		$ 0.15
Distributions payable, approved date			May 11, 2015		Dec. 9, 2014
Distributions payable, pay date			Jul. 14, 2015		Jan. 14, 2015
Restricted stock expense	492,000	877,000	$ 805,000	4,264,000
Difference between other comprehensive income and net income	0	$ 0	0	0
Accumulated other comprehensive income	$ 0		$ 0		$ 0
Executive Officer [Member]
Significant Accounting Policies [Line Items]
Restricted stock expense				$ 3,203,000

Significant Accounting Polici39

Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	6 Months Ended
	Jun. 30, 2015
Minimum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Minimum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	5 years
Maximum [Member] | Buildings And Improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	40 years
Maximum [Member] | Furniture, Fixtures And Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives of assets	10 years

Recent Transactions (Appointmen

Recent Transactions (Appointment Of Executive Officers) (Narrative) (Details)	Jun. 05, 2015item$ / sharesshares	Jun. 30, 2015USD ($)$ / sharesshares
Appointment Of Executive Officers [Line Items]
Shares granted		41,337
Shares under options - Granted	800,000	800,000
Exercisable period		10 years
Share price | $ / shares	$ 17.31	$ 3.06
Annual Installments | item	3
Common stock trade share price | $ / shares	$ 25
Common stock trading days		30 days
Messr Rudin And Messr DeMarco [Member]
Appointment Of Executive Officers [Line Items]
Annual base salary | $		$ 700,000
Annual bonus opportunity percentage		100.00%
Annual bonus opportunity amount | $		$ 700,000
Annual Bonus Opportunity Threshold Amount | $		$ 350,000
Annual bonus opportunity threshold percentage		50.00%
Shares under options - Granted	400,000
Exercisable period		10 years
Share price | $ / shares	$ 17.31
Annual Installments | item	3
Common stock trade share price | $ / shares	$ 25
Common stock trading days		30 days
Messr Rudin And Messr DeMarco [Member] | Maximum [Member]
Appointment Of Executive Officers [Line Items]
Annual bonus opportunity percentage		200.00%
Annual bonus opportunity amount | $		$ 1,400,000
Three Equal Annual Installment [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	400,000
Three Equal Annual Installment [Member] | Messr Rudin And Messr DeMarco [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	200,000
Common Stock Trades [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	400,000
Common Stock Trades [Member] | Messr Rudin And Messr DeMarco [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	200,000
Restricted Stock [Member] | Minimum [Member]
Appointment Of Executive Officers [Line Items]
Stock compensation vesting period		1 year
Restricted Stock [Member] | Maximum [Member]
Appointment Of Executive Officers [Line Items]
Stock compensation vesting period		7 years
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]
Appointment Of Executive Officers [Line Items]
Shares granted	37,550.54
Stock compensation vesting period		3 years
Restricted Stock [Member] | Messr Rudin And Messr DeMarco [Member] | 2013 Incentive Stock Plan [Member]
Appointment Of Executive Officers [Line Items]
Shares granted	18,775.27
Performance period		3 years
Performance Shares [Member] | 2013 Incentive Stock Plan [Member]
Appointment Of Executive Officers [Line Items]
Shares granted	112,651.64
Performance period		3 years
Performance Shares [Member] | Messr Rudin And Messr DeMarco [Member] | 2013 Incentive Stock Plan [Member]
Appointment Of Executive Officers [Line Items]
Shares granted	56,325.82
Performance period		3 years
Performance Shares [Member] | Three Years Period Award [Member] | 2013 Incentive Stock Plan [Member] | Minimum [Member]
Appointment Of Executive Officers [Line Items]
Percentage of shares vested	0.00%
Performance Shares [Member] | Three Years Period Award [Member] | 2013 Incentive Stock Plan [Member] | Maximum [Member]
Appointment Of Executive Officers [Line Items]
Percentage of shares vested	150.00%
Performance Shares [Member] | Three Years Period Award [Member] | Messr Rudin And Messr DeMarco [Member] | 2013 Incentive Stock Plan [Member] | Minimum [Member]
Appointment Of Executive Officers [Line Items]
Percentage of shares vested	0.00%
Performance Shares [Member] | Three Years Period Award [Member] | Messr Rudin And Messr DeMarco [Member] | 2013 Incentive Stock Plan [Member] | Maximum [Member]
Appointment Of Executive Officers [Line Items]
Percentage of shares vested	150.00%

Recent Transactions (Acquisitio

Recent Transactions (Acquisitions) (Narrative) (Details) $ in Thousands	Apr. 01, 2015USD ($)item	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)
Real Estate Properties [Line Items]
Purchase price of property		$ 42,881	$ 41,825
City Square Project [Member]
Real Estate Properties [Line Items]
Number of units | item	365
Purchase price of property	$ 3,100
Contingent consideration	$ 1,250
Minimum project start period	12 months	12 months
Total project costs	$ 91,400

Recent Transactions (Dispositio

Recent Transactions (Dispositions) (Narrative) (Details) $ in Thousands	Jun. 26, 2015USD ($)ft²	Jun. 01, 2015USD ($)item	Jan. 15, 2015USD ($)ft²	Sep. 30, 2013USD ($)	Jun. 30, 2015USD ($)ft²property	Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2014USD ($)	Dec. 31, 2014property
Real Estate Properties [Line Items]
Sales proceeds							$ 80,581	$ 190,798
Mortgage loan					$ 1,719,141		$ 1,719,141
Mortgage loan, maturity date							Aug. 1, 2029
Realized gain on sale					$ 34,399	$ 54,584	$ 34,543	$ 54,584
Number of properties sold | property									16
1451 Metropolitan Drive [Member]
Real Estate Properties [Line Items]
Area of property sold (in square feet) | ft²			21,600
Sales proceeds			$ 1,100
Realized gain on sale			$ 100
14 Sylvan Way [Member]
Real Estate Properties [Line Items]
Area of property sold (in square feet) | ft²	203,506
Sales proceeds	$ 80,000
Realized gain on sale	$ 24,700
Rosewood Lafayette Holdings, L.L.C. [Member]
Real Estate Properties [Line Items]
Percentage of interest in venture		25.00%
Number of units | item		217
Realized gain on sale		$ 6,400
4 Sylvan Way [Member]
Real Estate Properties [Line Items]
Area of property sold (in square feet) | ft²					105,135
Mortgage loan					$ 14,600		14,600
Mortgage loan, maturity date					Aug. 11, 2014
10 Independence Boulevard [Member]
Real Estate Properties [Line Items]
Area of property sold (in square feet) | ft²					120,528
Mortgage loan					$ 16,900		$ 16,900
Mortgage loan, maturity date					Aug. 11, 2014
4 Sylvan Way And 10 Independence [Member]
Real Estate Properties [Line Items]
Impairment charge on property				$ 12,200
Realized gain on sale					$ 9,700
Number of properties transferred | property					2

Recent Transactions (Summary Of

Recent Transactions (Summary Of Income From Property Disposed) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Real Estate Properties [Line Items]
Total revenues	$ 148,567	$ 160,300	$ 302,282	$ 329,896
Depreciation and amortization	(42,365)	(44,711)	(83,167)	(89,696)
Income from properties disposed of	27,353	29,557	54,361	42,724
Realized gains dispositions	34,399	54,584	34,543	54,584
Total income from properties disposed of	39,762	57,637	36,927	40,331
Disposal Group, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Total revenues	2,728	14,424	5,647	32,797
Operating and other expenses	(688)	(7,025)	(1,544)	(17,320)
Depreciation and amortization	(912)	(3,045)	(2,034)	(7,035)
Interest income	(557)	(880)	(1,355)	(1,767)
Income from properties disposed of	571	3,474	714	6,675
Realized gains dispositions	34,399	54,584	34,543	54,584
Total income from properties disposed of	$ 34,970	$ 58,058	$ 35,257	$ 61,259

Investments In Unconsolidated44

Investments In Unconsolidated Joint Ventures (Narrative) (Details) ft² in Millions		Jun. 01, 2015USD ($)item	May. 13, 2015USD ($)item	Jun. 30, 2015USD ($)ft²roompropertyitementity		Jun. 30, 2014USD ($)	Jun. 30, 2015USD ($)ft²roompropertyitementity		Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Company's investment in unconsolidated joint ventures				$ 284,507,000			$ 284,507,000			$ 247,468,000
Management, leasing, development and other services fees				1,400,000		$ 1,400,000	3,100,000		$ 2,800,000
Accounts receivable from unconsolidated joint ventures				$ 800,000			$ 800,000			$ 1,000,000
Number of VIEs | entity				9			9
Maximum exposure to loss				$ 206,100,000			$ 206,100,000
Estimated future funding commitments				51,800,000			51,800,000
Realized gain on sale				34,399,000		$ 54,584,000	34,543,000		$ 54,584,000
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				477,000,000			477,000,000
Outstanding borrowings under the facility				$ 263,600,000			$ 263,600,000
Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property				13			13
Number of units | item				4,343			4,343
Unconsolidated Joint Venture Retail Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property				2			2
Unconsolidated Joint Venture Land Parcels [Member]
Schedule of Equity Method Investments [Line Items]
Area of property (in square feet) | ft²				1.4			1.4
Number of units | item				2,910			2,910
Unconsolidated Joint Venture Office Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property				36			36
Unconsolidated Joint Venture Office And Retail Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Area of property (in square feet) | ft²				5.7			5.7
Unconsolidated Joint Venture Development Projects [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				1,074			1,074
Unconsolidated Joint Venture Hotel [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item				350			350
Parent Company [Member] | Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 67,800,000			$ 67,800,000
Outstanding borrowings under the facility				$ 36,900,000			$ 36,900,000
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture				7.50%			7.50%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture				85.00%			85.00%
Variable Interest Entity [Member]
Schedule of Equity Method Investments [Line Items]
Company's investment in unconsolidated joint ventures				$ 154,300,000			$ 154,300,000
South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's investment in unconsolidated joint ventures	[1]
Number of units | room				350			350
Percentage of interest in venture	[2]			50.00%			50.00%
Letter of credit				$ 4,100,000			$ 4,100,000
Overlook Ridge JV, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item			251
Percentage of interest in venture			50.00%
Amount sold			$ 74,600,000
Distribution cash received from sale			0
Realized gain on sale			$ 0
Rosewood Lafayette Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's investment in unconsolidated joint ventures	[3]									$ 62,000
Number of units | item		217		217	[3]		217	[3]
Percentage of interest in venture		25.00%		25.00%	[2],[3]		25.00%	[2],[3]
Realized gain on sale		$ 6,400,000
[1]	The negative carrying amount for this venture of $2,570 and $1,854 as of June 30, 2015 and December 31, 2014, respectively, were included in accounts payable, accrued expenses and other liabilities.
[2]	Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[3]	See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures.

Investments In Unconsolidated45

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) $ in Thousands		Sep. 03, 2013USD ($)	Jul. 30, 2013USD ($)	Jun. 30, 2015USD ($)ft²room$ / itempropertyitem		Jun. 30, 2014USD ($)	Jun. 01, 2015item	May. 13, 2015item	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Carrying Amount				$ 284,507					$ 247,468
Property Debt, Balance				$ 1,719,141
Property Debt, Maturity Date				Aug. 1, 2029
Accounts payable, accrued expenses and other liabilities				$ 134,089					126,971
Collection of notes receivable				$ 7,750		$ 250
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				7.50%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %				85.00%
Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				5,644
Marbella RoseGarden, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			412
Company's Effective Ownership %	[1],[2]			24.27%
Carrying Amount	[1]			$ 15,721					15,779
Property Debt, Balance	[1]			$ 95,000
Property Debt, Maturity Date	[1]			May 1, 2018
Property Debt, Interest Rate	[1]			4.99%
RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			523
Company's Effective Ownership %	[1],[2]			15.00%
Carrying Amount	[1]			$ 1,532					2,161
Property Debt, Balance	[1]			$ 165,000
Property Debt, Maturity Date	[1]			Feb. 1, 2021
Property Debt, Interest Rate	[1]			4.19%
Rosewood Lafayette Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				217	[3]		217
Company's Effective Ownership %				25.00%	[2],[3]		25.00%
Carrying Amount	[3]								62
PruRose Port Imperial South 15, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			236
Company's Effective Ownership %	[1],[2]			50.00%
Property Debt, Balance	[1]			$ 57,500
Property Debt, Maturity Date	[1]			Sep. 1, 2020
Property Debt, Interest Rate	[1]			4.32%
Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[4],[5]			130
Company's Effective Ownership %	[2],[4],[5]			12.50%
Carrying Amount	[4],[5]			$ 5,806					6,029
Property Debt, Balance	[4],[5],[6]			$ 46,217
Property Debt, Interest Rate	[4],[5],[6]
Overlook Ridge JV, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item								251
Company's Effective Ownership %								50.00%
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			371
Company's Effective Ownership %	[1],[2]			50.00%
Carrying Amount	[1]			$ 2,277					2,524
Property Debt, Balance	[1]			$ 52,662
Property Debt, Maturity Date	[1]			Dec. 26, 2015
Property Debt, Interest Rate, LIBOR	[1],[7]			L+2.50
Property Debt, Interest Rate, Spread Over LIBOR	[1],[7]			2.50%
Overlook Ridge JV 2C/3B, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Interest Rate				3.0875%
Number of extension options | item				2
Loan extension period				1 year
Maximum borrowing capacity				$ 55,500
Notional amount		$ 1,840		$ 52,000
Overlook Ridge JV 2C/3B, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]
Schedule of Equity Method Investments [Line Items]
Extension fee				0.25%
PruRose Riverwalk G, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			316
Company's Effective Ownership %	[1],[2]			25.00%
Carrying Amount	[1]			$ 425					955
Property Debt, Balance	[1]			$ 79,380
Property Debt, Maturity Date	[1]			Jul. 15, 2021
Property Debt, Interest Rate	[1],[8]			6.00%
PruRose Riverwalk G, L.L.C. [Member] | Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 80,249
Elmajo Urban Renewal Associates, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			355
Company's Effective Ownership %	[1],[2]			7.50%
Property Debt, Balance	[1]			$ 128,100
Property Debt, Maturity Date	[1]			Mar. 1, 2030
Property Debt, Interest Rate	[1],[9]			4.00%
Elmajo Urban Renewal Associates, LLC [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 91,000
Crystal House Apartments Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[10]			798
Company's Effective Ownership %	[2],[10]			25.00%
Carrying Amount	[10]			$ 28,018					27,051
Property Debt, Balance	[10]			$ 165,000
Property Debt, Maturity Date	[10]			Apr. 1, 2020
Property Debt, Interest Rate	[10]			3.17%
Percentage of interest in developable land				50.00%
Number of units available for development | $ / item				295
Number of approved units available for development | item				252
Portside Master Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			176
Company's Effective Ownership %	[1],[2]			38.25%
Carrying Amount	[1]			$ 379					1,747
Property Debt, Balance	[1]			$ 42,108
Property Debt, Maturity Date	[1]			Dec. 4, 2015
Property Debt, Interest Rate, LIBOR	[1],[11]			L+2.50
Property Debt, Interest Rate, Spread Over LIBOR	[1],[11]			2.50%
Portside Master Company, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Number of extension options | item				2
Maximum borrowing capacity				$ 42,500
Portside Master Company, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]
Schedule of Equity Method Investments [Line Items]
Loan extension period				2 years
Extension fee				0.125%
Portside Master Company, L.L.C. [Member] | Construction Loan Extension Number 2 [Member]
Schedule of Equity Method Investments [Line Items]
Loan extension period				2 years
Extension fee				0.25%
PruRose Port Imperial South 13, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			280
Company's Effective Ownership %	[1],[2]			20.00%
Carrying Amount	[1]			$ 274					1,087
Property Debt, Balance	[1]			$ 64,927
Property Debt, Maturity Date	[1]			Jun. 27, 2016
Property Debt, Interest Rate, LIBOR	[1],[12]			L+2.15
Property Debt, Interest Rate, Spread Over LIBOR	[1],[12]			2.15%
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Interest Rate				2.79%
Maximum borrowing capacity				$ 73,350
Notional amount			$ 1,620	$ 69,500
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]
Schedule of Equity Method Investments [Line Items]
Loan extension period				1 year
Extension fee				0.25%
PruRose Port Imperial South 13, L.L.C. [Member] | Construction Loan Extension Number 2 [Member]
Schedule of Equity Method Investments [Line Items]
Loan extension period				6 months
Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[13]			363
Company's Effective Ownership %	[2],[13]			20.00%
Carrying Amount	[13]			$ 1,678					1,800
RoseGarden Marbella South, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				311
Company's Effective Ownership %	[2]			24.27%
Carrying Amount				$ 14,149					11,282
Property Debt, Balance				$ 51,206
Property Debt, Maturity Date				Mar. 30, 2017
Property Debt, Interest Rate, LIBOR	[14]			L+2.25
Property Debt, Interest Rate, Spread Over LIBOR	[14]			2.25%
RoseGarden Marbella South, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Number of extension options | item				2
Loan extension period				1 year
Maximum borrowing capacity				$ 77,400
RoseGarden Marbella South, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]
Schedule of Equity Method Investments [Line Items]
Extension fee				0.25%
Estuary Urban Renewal Unit B, LLC [Member
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item	[1]			227
Company's Effective Ownership %	[1],[2]			7.50%
Property Debt, Balance	[1]			$ 81,900
Property Debt, Maturity Date	[1]			Mar. 1, 2030
Property Debt, Interest Rate	[1],[15]			4.00%
Estuary Urban Renewal Unit B, LLC [Member | Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 57,000
Riverpark At Harrison I, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				141
Company's Effective Ownership %	[2]			36.00%
Carrying Amount				$ 4,420					4,744
Property Debt, Balance				$ 23,400
Property Debt, Maturity Date				Jun. 27, 2016
Property Debt, Interest Rate, LIBOR	[16]			L+2.35
Property Debt, Interest Rate, Spread Over LIBOR	[16]			2.35%
Riverpark At Harrison I, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Number of extension options | item				2
Loan extension period				1 year
Maximum borrowing capacity				$ 23,400
Riverpark At Harrison I, L.L.C. [Member] | Construction Loan Extension Number 1 [Member]
Schedule of Equity Method Investments [Line Items]
Extension fee				0.20%
Capitol Place Mezz LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				378
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 48,610					49,327
Property Debt, Balance				$ 91,434
Property Debt, Maturity Date				Jul. 1, 2033
Property Debt, Interest Rate	[17]			4.82%
Capitol Place Mezz LLC [Member] | Construction/Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 100,700
Harborside Unit A Urban Renewal, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				763
Company's Effective Ownership %	[2]			85.00%
Carrying Amount				$ 77,564					34,954
Property Debt, Maturity Date				Aug. 1, 2029
Property Debt, Interest Rate	[18]			5.197%
Harborside Unit A Urban Renewal, LLC [Member] | Construction/Permanent Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity				$ 192,000
Rosegarden Monaco L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				250
Company's Effective Ownership %	[2]			41.67%
Carrying Amount				$ 1,310					1,283
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				850
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 337					337
Red Bank Corporate Plaza, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				92,878
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 4,201					3,963
Property Debt, Balance				$ 15,496
Property Debt, Maturity Date				May 17, 2016
Property Debt, Interest Rate				3.99375%
Property Debt, Interest Rate, LIBOR	[19]			L+3.00
Property Debt, Interest Rate, Spread Over LIBOR	[19]			3.00%
Notional amount				$ 13,650
12 Vreeland Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				139,750
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 5,692					5,620
Property Debt, Balance				$ 13,278
Property Debt, Maturity Date				Jul. 1, 2023
Property Debt, Interest Rate				2.87%
BNES Associates III [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				106,345
Company's Effective Ownership %	[2]			31.25%
Carrying Amount				$ 2,114					1,993
Property Debt, Balance				$ 6,448
Property Debt, Maturity Date				Nov. 1, 2023
Property Debt, Interest Rate				4.76%
Hillsborough 206 Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				160,000
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 1,962					1,962
KPG-P 100 IMW JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				339,615
Company's Effective Ownership %	[2]			33.33%
Carrying Amount				$ 37
Property Debt, Balance				$ 61,500
Property Debt, Maturity Date				Sep. 9, 2016
Property Debt, Interest Rate, LIBOR	[20]			L+7.00
Property Debt, Interest Rate, Spread Over LIBOR	[20]			7.00%
Number of extension options | item				2
Loan extension period				1 year
Outstanding borrowings under the facility				$ 5,700
Construction reserve				$ 25,000
Keystone-Penn [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				1,842,820
Company's Effective Ownership %	[2],[21]
Property Debt, Balance				$ 207,345
Property Debt, Interest Rate	[22]
Keystone-Penn [Member] | Principal Balance Due August 27, 2023 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 127,600
Property Debt, Maturity Date				Aug. 27, 2023
Property Debt, Interest Rate				5.114%
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 69,320
Property Debt, Maturity Date				Aug. 27, 2016
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Interest Rate, Spread Over LIBOR				5.00%
Keystone-Penn [Member] | Principal Balance Due August 27, 2016 [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Interest Rate, Spread Over LIBOR				5.75%
Keystone-Penn [Member] | Principal Balance Due August 27, 2015 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 10,425
Property Debt, Maturity Date				Aug. 27, 2015
Property Debt, Interest Rate, Spread Over LIBOR				6.00%
Keystone-TriState [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				1,266,384
Company's Effective Ownership %	[2],[23]
Carrying Amount				$ 4,549					6,140
Property Debt, Balance				$ 206,272
Property Debt, Interest Rate	[24]
Sale price of property, capital balance in properties in which senior pari passu interest is held				$ 4,500
Number of properties with senior pari passu interest | property				5
Keystone-TriState [Member] | Principal Balance Due July 1, 2017 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 41,848
Property Debt, Maturity Date				Jul. 1, 2017
Property Debt, Interest Rate				4.95%
Keystone-TriState [Member] | Principal Balance Due September 9th, 2017 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 71,724
Property Debt, Maturity Date				Sep. 9, 2017
Bears interest at fixed rate range, minimum				5.65%
Bears interest at fixed rate range, maximum				6.75%
Keystone-TriState [Member] | Principal Balance Due July 6, 2024 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 14,250
Property Debt, Maturity Date				Jul. 6, 2024
Property Debt, Interest Rate				4.88%
Keystone-TriState [Member] | Principal Balance Due July 6, 2044 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 63,400
Property Debt, Maturity Date				Jul. 6, 2044
Property Debt, Interest Rate				4.93%
Keystone-TriState [Member] | Principal Balance Due August 6, 2044 [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 15,050
Property Debt, Maturity Date				Aug. 6, 2044
Property Debt, Interest Rate				4.71%
Keystone-TriState [Member] | Parent Company [Member]
Schedule of Equity Method Investments [Line Items]
Internal rate of return				10.00%
Keystone-TriState [Member] | Keystone Property Group [Member]
Schedule of Equity Method Investments [Line Items]
Internal rate of return				15.00%
Keystone-Penn And Keystone-TriState [Member] | Parent Company [Member]
Schedule of Equity Method Investments [Line Items]
Internal rate of return				15.00%
Keystone-Penn And Keystone-TriState [Member] | Keystone Property Group [Member]
Schedule of Equity Method Investments [Line Items]
Internal rate of return				10.00%
KPG-MCG Curtis JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²	[25]			885,000
Company's Effective Ownership %	[2],[25]			50.00%
Carrying Amount	[25]			$ 57,382					59,911
Property Debt, Balance	[25],[26]
Property Debt, Interest Rate	[25],[26]
Plaza VIII & IX Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				1,225,000
Company's Effective Ownership %	[2]			50.00%
Carrying Amount				$ 3,867					4,022
Roseland/North Retail, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²	[1]			30,745
Company's Effective Ownership %	[1],[2]			20.00%
Carrying Amount	[1]			$ 1,793					$ 1,828
South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | room				350
Company's Effective Ownership %	[2]			50.00%
Carrying Amount	[27]
Property Debt, Balance				$ 64,968
Property Debt, Maturity Date				Aug. 1, 2020
Property Debt, Interest Rate	[28]
Note payable				$ 4,124
Bears interest at fixed rate range, minimum				6.09%
Bears interest at fixed rate range, maximum				6.62%
Accounts payable, accrued expenses and other liabilities				$ 2,570					$ 1,854
South Pier At Harborside [Member] | Hotel [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 60,844
Property Debt, Maturity Date				Nov. 1, 2016
Property Debt, Interest Rate				6.15%
Stamford SM LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's Effective Ownership %	[2],[29]			80.00%
Stamford SM LLC [Member] | Mezz Loan [Member]
Schedule of Equity Method Investments [Line Items]
Collection of notes receivable				$ 47,200
Stamford SM LLC [Member] | Parent Company [Member] | Mezz Loan [Member]
Schedule of Equity Method Investments [Line Items]
Collection of notes receivable				37,800
Other [Member]
Schedule of Equity Method Investments [Line Items]
Carrying Amount	[30]			$ 410					$ 907
The Shops At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Area of Real Estate Property | ft²				50,973
Property Debt, Balance				$ 6,500
Property Debt, Maturity Date				Aug. 1, 2018
Property Debt, Interest Rate				3.63%
Residual ownership interest				12.50%
Additional borrowing capacity				$ 1,000
Lofts At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | item				59
Property Debt, Balance				$ 1,117
Property Debt, Maturity Date				Sep. 1, 2015
Property Debt, Interest Rate, Spread Over LIBOR				2.50%
Indirect ownership interest				25.00%
Number of stories | item				5
Metropolitan Property [Member] | Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Property Debt, Balance				$ 38,600
Property Debt, Maturity Date				Sep. 1, 2020
Property Debt, Interest Rate				3.25%
Port Imperial North Land [Member] | Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Number of Apartment Units | $ / item				836
Residual ownership interest				20.00%
[1]	The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the Company is not expected to meaningfully participate in the venture's cash flows in the near term.
[2]	Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[3]	See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures.
[4]	The Company's ownership interests in this venture are subordinate to its partner's preferred capital balance and the payment of the outstanding balance remaining on a note ($975 as of June 30, 2015), and is not expected to meaningfully participate in the venture's cash flows in the near term.
[5]	Through the joint venture, the Company also owns a 12.5 percent interest in a 50,973 square feet retail building ("Shops at 40 Park") and a 25 percent interest in a to-be-built 59-unit, five story multi-family rental development property ("Lofts at 40 Park").
[6]	Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600, bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500, bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117, bears interest at LIBOR plus 250 basis points and matures in September 2015. The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved.
[7]	The construction loan has a maximum borrowing amount of $55,500 and provides, subject to certain conditions, two one-year extension options with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 3.0875 percent per annum on an initial notional amount of $1,840, increasing to $52,000, for the period from September 3, 2013 to November 2, 2015.
[8]	The permanent loan has a maximum borrowing amount of $80,249.
[9]	The construction loan with a maximum borrowing amount of $91,000 converted to a permanent loan on February 27, 2015.
[10]	The Company also owns a 50 percent interest in a vacant land to accommodate the development of approximately 295 additional units of which 252 are currently approved.
[11]	The construction loan has a maximum borrowing amount of $42,500 and provides, subject to certain conditions, two two-year extension options with a fee of 12.5 basis points for the first two-year extension and 25 basis points for the second two-year extension.
[12]	The construction loan has a maximum borrowing amount of $73,350 and provides, subject to certain conditions, one-year extension option followed by a six-month extension option with a fee of 25 basis points each. The joint venture has a swap agreement that fixes the all-in rate to 2.79 percent per annum on an initial notional amount of $1,620, increasing to $69,500 for the period from July 1, 2013 to January 1, 2016.
[13]	The Company also owns a 20 percent residual interest in undeveloped land parcels: parcels 6, I, and J ("Port Imperial North Land") that can accommodate the development of 836 apartment units.
[14]	The construction loan has a maximum borrowing amount of $77,400 and provides, subject to certain conditions, two one-year extension options with a fee of 25 basis points for each year.
[15]	The construction loan with a maximum borrowing amount of $57,000 converted to a permanent loan on February 27, 2015.
[16]	The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one-year extension options with a fee of 20 basis points for each year.
[17]	The construction/permanent loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017.
[18]	The construction/permanent loan has a maximum borrowing amount of $192,000.
[19]	The joint venture has a swap agreement that fixes the all-in rate to 3.99375 percent per annum on an initial notional amount of $13,650 and then adjusting in accordance with an amortization schedule, which is effective from October 17, 2011 through loan maturity.
[20]	The mortgage loan has two one-year extension options, subject to certain conditions, and includes a $25 million construction escrow with a balance of $19.6 million to be drawn at June 30, 2015.
[21]	The Company's equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return ("IRR") after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.
[22]	Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $69,320 bears interest at rates ranging from LIBOR+5.0 percent to LIBOR+5.75 percent and matures in August 27, 2016; principal balance of $10,425 bears interest at LIBOR+6.0 percent matures in August 27, 2015.
[23]	Includes the Company's pari-passu interests of $4.5 million in five properties and Company's subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return ("IRR") after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.
[24]	Principal balance of $41,848 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $71,724 bears interest at rates ranging from 5.65 percent to 6.75 percent and matures on September 9, 2017; principal balance of $14,250 bears interest at 4.88 percent and matures on July 6, 2024; principal balance of $63,400 bears interest at 4.93 percent and matures on July 6, 2044; principal balance of $15,050 bears interest at 4.71 percent and matures on August 6, 2044.
[25]	Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12.
[26]	See Note 9: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.
[27]	The negative carrying amount for this venture of $2,570 and $1,854 as of June 30, 2015 and December 31, 2014, respectively, were included in accounts payable, accrued expenses and other liabilities.
[28]	Balance includes: (i) mortgage loan, collateralized by the hotel property, with a balance of $60,844, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $4,124, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020. The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner.
[29]	The joint venture collected net proceeds of $47.2 million at maturity, of which the Company received its share of $37.8 million on August 6, 2014.
[30]	The Company owns other interests in various unconsolidated joint ventures, including interests in assets previously owned and interest in ventures whose businesses are related to its core operations. These ventures are not expected to significantly impact the Company's operations in the near term.

Investments In Unconsolidated46

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	$ (2,329)	$ 443	$ (5,858)	$ (792)
Marbella RoseGarden, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	61	(9)	122	(15)
RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(313)	(238)	(629)	(515)
Rosewood Lafayette Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		(203)	(62)	(419)
Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(91)	(76)	(185)	(174)
Overlook Ridge JV 2C/3B, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(27)		(247)	62
PruRose Riverwalk G, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(276)	(613)	(530)	(1,151)
Elmajo Urban Renewal Associates, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		(91)		(203)
Crystal House Apartments Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	13	53	3	(274)
Portside Master Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(637)	(220)	(1,357)	(434)
PruRose Port Imperial South 13, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(506)	(213)	(731)	(418)
Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(125)	(180)	(309)	(345)
Estuary Urban Renewal Unit B, LLC [Member
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures				(15)
Riverpark At Harrison I, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(150)		(324)
Capitol Place Mezz LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(1,263)		(1,188)
Harborside Unit A Urban Renewal, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		(212)		(212)
Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		(16)	(19)	(54)
Red Bank Corporate Plaza, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	112	106	222	205
12 Vreeland Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	86	54	72	144
BNES Associates III [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	52	110	121	147
Hillsborough 206 Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(5)		(5)	(5)
KPG-P 100 IMW JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(379)	(483)	(763)	(1,136)
Keystone-TriState [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(242)		(1,590)
KPG-MCG Curtis JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	232	251	428	251
Plaza VIII & IX Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	70	44	156	146
Roseland/North Retail, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(18)	(23)	(36)	(47)
South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	868	892	784	1,290
Stamford SM LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		928		1,844
Other [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	$ 209	$ 582	$ 209	$ 536

Investments In Unconsolidated47

Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 1,597,359	$ 1,534,812
Other assets	421,753	398,222
Total assets	2,019,112	1,933,034
Mortgages and loans payable	1,193,461	1,060,020
Other liabilities	215,077	211,340
Partners'/members' capital	610,574	661,674
Total liabilities and partners'/members' capital	$ 2,019,112	$ 1,933,034

Investments In Unconsolidated48

Investments In Unconsolidated Joint Ventures (Summary Of Results Of Operations Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments In Unconsolidated Joint Ventures [Abstract]
Total revenues	$ 81,075	$ 113,118	$ 155,552	$ 144,111
Operating and other expenses	(55,953)	(96,605)	(113,309)	(114,958)
Depreciation and amortization	(17,816)	(8,213)	(34,809)	(16,581)
Interest expense	(13,324)	(8,786)	(24,658)	(15,127)
Net loss	$ (6,018)	$ (486)	$ (17,224)	$ (2,555)

Deferred Charges, Goodwill An49

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deferred leasing costs		$ 229,989	$ 239,138
Deferred financing costs		20,823	24,042
Deferred charges, gross		250,812	263,180
Accumulated amortization		(113,469)	(122,358)
Deferred charges, net		137,343	140,822
Notes receivable	[1]	13,619	21,491
In-place lease values, related intangibles and other assets, net		5,458	6,565
Goodwill		2,945	2,945
Prepaid expenses and other assets, net		38,408	32,827
Total deferred charges, goodwill and other assets		$ 197,773	$ 204,650
Mortgage loan, maturity date		Aug. 1, 2029
Mortgage Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 10,400
Spread over LIBOR		6.00%
Mortgage loan, maturity date		Aug. 1, 2016
Interest-Free Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 3,200
Mortgage loan, maturity date		Apr. 1, 2023
[1]	Includes as of June 30, 2015: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent and matures in August 2016; and an interest-free note receivable with a net present value of $3.2 million and matures in April 2023. The Company believes these balances are fully collectible.

Deferred Charges, Goodwill An50

Deferred Charges, Goodwill And Other Assets, Net (Summary Of Notional Fair Value Of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair Value		$ 15	$ 15	$ 95
Interest and other investment income (loss)		(17,000)	(80,000)
LIBOR Cap One [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 51,000	$ 51,000
Strike Rate		1.50%	1.50%
Effective Date			Sep. 1, 2014
Expiration Date			Oct. 1, 2015
Fair Value				1
LIBOR Cap Two [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 24,000	$ 24,000
Strike Rate		1.50%	1.50%
Effective Date			Sep. 1, 2014
Expiration Date			Oct. 1, 2015
Fair Value				1
LIBOR Cap Three [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 51,000	$ 51,000
Strike Rate		1.75%	1.75%
Effective Date			Oct. 1, 2015
Expiration Date			Oct. 1, 2016
Fair Value		$ 10	$ 10	64
LIBOR Cap Four [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 24,000	$ 24,000
Strike Rate		1.75%	1.75%
Effective Date			Oct. 1, 2015
Expiration Date			Oct. 1, 2016
Fair Value		$ 5	$ 5	$ 29
[1]	The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks.

Restricted Cash (Details)

Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Restricted Cash [Abstract]
Security deposits	$ 7,690	$ 7,795
Escrow and other reserve funds	34,362	26,450
Total restricted cash	$ 42,052	$ 34,245

Senior Unsecured Notes (Details

Senior Unsecured Notes (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 1,268,293		$ 1,267,744
Repayments of senior unsecured notes			$ 200,000
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 200,047		200,086
Effective rate	[1]	5.806%
Interest rate of senior unsecured notes		5.80%
Maturity date of the senior unsecured notes		Jan. 15, 2016
2.500% Senior Unsecured Notes, Due December 15, 2017 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 249,298		249,150
Effective rate	[1]	2.803%
Interest rate of senior unsecured notes		2.50%
Maturity date of the senior unsecured notes		Dec. 15, 2017
7.750% Senior Unsecured Notes, Due August 15, 2019 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 249,120		249,013
Effective rate	[1]	8.017%
Interest rate of senior unsecured notes		7.75%
Maturity date of the senior unsecured notes		Aug. 15, 2019
4.500% Senior Unsecured Notes Due April 18, 2022 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 299,595		299,565
Effective rate	[1]	4.612%
Interest rate of senior unsecured notes		4.50%
Maturity date of the senior unsecured notes		Apr. 18, 2022
3.150% Senior Unsecured Notes, Due May 15, 2023 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 270,233		$ 269,930
Effective rate	[1]	3.517%
Interest rate of senior unsecured notes		3.15%
Maturity date of the senior unsecured notes		May 15, 2023
[1]	Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.

Unsecured Revolving Credit Fa53

Unsecured Revolving Credit Facility (Narrative) (Details) - Entity [Domain]	6 Months Ended
	Jun. 30, 2015USD ($)item	Dec. 31, 2014USD ($)
Unsecured Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Number of lending institutions	17
Borrowing capacity under the credit facility | $	$ 600,000,000
Expandable borrowing capacity under the credit facility | $	$ 1,000,000,000
Credit facility maturity date	Jul. 1, 2017
Number of extension options	2
Credit facility, extension period	6 months
Line of credit facility, bid feature, current borrowing capacity | $	$ 300,000,000
Terms of the unsecured facility	The terms of the unsecured facility include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the facility described below, or (ii) the property dispositions are completed while the Company is under an event of default under the facility, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).
Terms of dividend restriction	If an event of default has occurred and is continuing, the Corporation will not make any excess distributions except to enable the Corporation to continue to qualify as a REIT under the Code.
Outstanding borrowings under the facility | $	$ 0	$ 0
Unsecured Revolving Credit Facility 1 [Member]
Line Of Credit Facility [Line Items]
Credit facility extension fee, basis points	0.075%
Unsecured Revolving Credit Facility 2 [Member]
Line Of Credit Facility [Line Items]
Credit facility extension fee, basis points	0.075%
Minimum [Member] | Unsecured Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Fixed charge coverage ratio	1.5
Unencumbered property interest coverage	2
Maximum [Member] | Unsecured Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Leverage ratio	60.00%
Secured indebtedness	40.00%
Unsecured indebtedness	60.00%
Investment limitations as a percentage of total capitalization	15.00%

Unsecured Revolving Credit Fa54

Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details) - 6 months ended Jun. 30, 2015 - Unsecured Revolving Credit Facility [Member]	Total
No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]
Line Of Credit Facility [Line Items]
Unsecured Debt Ratings	No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.70%
Facility Fee Basis Points	0.35%
Moody's, Baa3 Rating [Member] | Standard & Poor's, BBB- Rating [Member]
Line Of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB- or Baa3 (current)
Interest Rate - Applicable Basis Points Above LIBOR	1.30%
Facility Fee Basis Points	0.30%
Moody's, Baa2 Rating [Member] | Standard & Poor's, BBB Rating [Member]
Line Of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB or Baa2
Interest Rate - Applicable Basis Points Above LIBOR	1.10%
Facility Fee Basis Points	0.20%
Moody's, Baa1 Rating [Member] | Standard & Poor's, BBB+ Rating [Member]
Line Of Credit Facility [Line Items]
Unsecured Debt Ratings	BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR	1.00%
Facility Fee Basis Points	0.15%
A3 Or Higher [Member] | A- Or Higher [Member]
Line Of Credit Facility [Line Items]
Unsecured Debt Ratings	A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR	0.925%
Facility Fee Basis Points	0.125%

Mortgages, Loans Payable And 55

Mortgages, Loans Payable And Other Obligations (Narrative) (Details)	6 Months Ended
	Jun. 30, 2015USD ($)property	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Number of properties with encumbered company mortgages | property	26
Book value of encumbered properties	$ 932,000,000
Cash paid for interest	53,353,000	$ 61,999,000
Interest capitalized	7,388,000	6,493,000
Total indebtedness	$ 2,034,819,000		$ 2,088,654,000
Weighted Average [Member]
Debt Instrument [Line Items]
Total indebtedness, weighted average interest rate	5.67%		5.64%
Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Interest capitalized	$ 2,314,000	$ 1,953,000
Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 139,543,000		$ 159,860,000
Total indebtedness, weighted average interest rate	3.89%		3.83%
Fixed Rate Debt And Other Obligations [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 1,895,276,000		$ 1,928,794,000
Total indebtedness, weighted average interest rate	5.80%		5.79%

Mortgages, Loans Payable And 56

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details) - Entity [Domain] $ in Thousands		6 Months Ended
		Jun. 30, 2015USD ($)itemproperty	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Mortgages, loans payable and other obligations		$ 766,526		$ 820,910
Repayment of mortgages, loans payable, and other obligations		$ 27,251	$ 42,469
6 Becker, 85 Livingston, 75 Livingston And 20 Waterview [Member]
Debt Instrument [Line Items]
Property Name	[1]	6 Becker, 85 Livingston, 75 Livingston & 20 Waterview
Lender	[1]	Wells Fargo CMBS
Effective rate	[1],[2]	10.26%
Mortgages, loans payable and other obligations	[1]	$ 65,035		65,035
Loan maturity date	[1],[3]	Aug. 11, 2014
Number of properties used to collateralize mortgage | property		4
4 Sylvan [Member]
Debt Instrument [Line Items]
Property Name	[4]	4 Sylvan (c)
Lender	[4]	Wells Fargo CMBS
Effective rate	[2],[4]	10.26%
Mortgages, loans payable and other obligations	[4]			14,575
10 Independence Boulevard [Member]
Debt Instrument [Line Items]
Property Name	[5]	10 Independence (d)
Lender	[5]	Wells Fargo CMBS
Effective rate	[2],[5]	10.26%
Mortgages, loans payable and other obligations	[5]			16,924
Overlook - Site IIID, IIIC, IIIA [Member]
Debt Instrument [Line Items]
Property Name	[6]	Overlook - Site IIID,IIIC, IIIA (b)
Lender	[6]	Wells Fargo Bank N.A.
LIBOR	[2],[6]	LIBOR+3.50
Spread over LIBOR	[2]	3.50%
Mortgages, loans payable and other obligations	[6]			17,260
Overlook - Site IIB [Member]
Debt Instrument [Line Items]
Property Name	[6]	Overlook - Site IIB (Quarrystone I) (b)
Lender	[6]	Wells Fargo Bank N.A.
LIBOR	[2],[6]	LIBOR+2.50
Spread over LIBOR	[2]	2.50%
Mortgages, loans payable and other obligations	[6]			5,787
9200 Edmonston Road [Member]
Debt Instrument [Line Items]
Property Name		9200 Edmonston Road
Lender		Principal Commercial Funding L.L.C.
Effective rate	[2]	5.534%
Mortgages, loans payable and other obligations		$ 3,857		3,951
Loan maturity date	[7]	May 1, 2015
Port Imperial South [Member]
Debt Instrument [Line Items]
Property Name		Port Imperial South
Lender		Wells Fargo Bank N.A.
LIBOR	[2]	LIBOR+1.75
Spread over LIBOR	[2]	1.75%
Mortgages, loans payable and other obligations		$ 44,550		44,119
Loan maturity date		Sep. 19, 2015
4 Becker [Member]
Debt Instrument [Line Items]
Property Name		4 Becker
Lender		Wells Fargo CMBS
Effective rate	[2]	9.55%
Mortgages, loans payable and other obligations		$ 39,739		39,421
Loan maturity date		May 11, 2016
5 Becker [Member]
Debt Instrument [Line Items]
Property Name	[8]	5 Becker (h)
Lender	[8]	Wells Fargo CMBS
Effective rate	[2],[8]	19.45%
Mortgages, loans payable and other obligations	[8]	$ 14,288		13,867
Loan maturity date	[8]	May 11, 2016
210 Clay [Member]
Debt Instrument [Line Items]
Property Name	[9]	210 Clay (i)
Lender	[9]	Wells Fargo CMBS
Effective rate	[2],[9]	18.10%
Mortgages, loans payable and other obligations	[9]	$ 13,770		13,330
Loan maturity date	[9]	May 11, 2016
Curtis Center [Member]
Debt Instrument [Line Items]
Property Name	[10]	Curtis Center (j)
Lender	[10]	CCRE & PREFG
LIBOR	[2],[10],[11]	LIBOR+5.912
Spread over LIBOR	[2],[10],[11]	5.912%
Mortgages, loans payable and other obligations	[10]	$ 64,000		64,000
Loan maturity date	[10]	Oct. 9, 2016
Percentage of interest in venture		50.00%
Number of extension options | item		3
Loan extension period		1 year
Deferred financing costs amortization interest rate		1.362%
Curtis Center [Member] | Senior Loan [Member]
Debt Instrument [Line Items]
Effective rate		3.48%
Spread over LIBOR		3.29%
Mortgages, loans payable and other obligations		$ 102,000
Percentage of interest in venture		50.00%
LIBOR measurement period		1 month
Curtis Center [Member] | Mezzanine Loan [Member]
Debt Instrument [Line Items]
Effective rate		9.686%
Spread over LIBOR		9.50%
Mortgages, loans payable and other obligations		$ 26,000
Percentage of interest in venture		50.00%
Maximum borrowing capacity		$ 48,000
LIBOR measurement period		1 month
Various [Member]
Debt Instrument [Line Items]
Property Name	[12]	Various (k)
Lender	[12]	Prudential Insurance
Effective rate	[2],[12]	6.332%
Mortgages, loans payable and other obligations	[12]	$ 144,551		145,557
Loan maturity date	[12]	Jan. 15, 2017
Number of properties used to collateralize mortgage | property		7
Repayment of mortgages, loans payable, and other obligations		$ 61,100
150 Main St. [Member]
Debt Instrument [Line Items]
Property Name		150 Main St.
Lender		Webster Bank
LIBOR	[2]	LIBOR+2.35
Spread over LIBOR	[2]	2.35%
Mortgages, loans payable and other obligations		$ 3,493		1,193	[13]
Loan maturity date		Mar. 30, 2017
150 Main St. [Member] | Construction Loan [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 28,800
23 Main Street [Member]
Debt Instrument [Line Items]
Property Name		23 Main Street
Lender		JPMorgan CMBS
Effective rate	[2]	5.587%
Mortgages, loans payable and other obligations		$ 28,878		29,210
Loan maturity date		Sep. 1, 2018
Harborside Plaza 5 [Member]
Debt Instrument [Line Items]
Property Name		Harborside Plaza 5
Lender		The Northwestern Mutual Life Insurance Co. & New York Life Insurance Co.
Effective rate	[2]	6.842%
Mortgages, loans payable and other obligations		$ 219,682		221,563
Loan maturity date		Nov. 1, 2018
100 Walnut Avenue [Member]
Debt Instrument [Line Items]
Property Name		100 Walnut Avenue
Lender		Guardian Life Insurance Co.
Effective rate	[2]	7.311%
Mortgages, loans payable and other obligations		$ 18,410		18,542
Loan maturity date		Feb. 1, 2019
One River Center [Member]
Debt Instrument [Line Items]
Property Name	[14]	One River Center (l)
Lender	[14]	Guardian Life Insurance Co.
Effective rate	[2],[14]	7.311%
Mortgages, loans payable and other obligations	[14]	$ 42,173		42,476
Loan maturity date	[14]	Feb. 1, 2019
Number of properties used to collateralize mortgage | property		3
Park Square [Member]
Debt Instrument [Line Items]
Property Name		Park Square
Lender		Wells Fargo Bank N.A.
LIBOR	[2],[15]	LIBOR+1.872
Spread over LIBOR	[2],[15]	1.872%
Mortgages, loans payable and other obligations		$ 27,500		27,500
Loan maturity date		Apr. 10, 2019
Deferred financing costs amortization interest rate		0.122%
Port Imperial South 4/5 Retail [Member]
Debt Instrument [Line Items]
Property Name		Port Imperial South 4/5 Retail
Lender		American General Life & A/G PC
Effective rate	[2]	4.559%
Mortgages, loans payable and other obligations		$ 4,000		4,000
Loan maturity date		Dec. 1, 2021
Port Imperial South 4/5 Garage [Member]
Debt Instrument [Line Items]
Property Name		Port Imperial South 4/5 Garage
Lender		American General Life & A/G PC
Effective rate	[2]	4.853%
Mortgages, loans payable and other obligations		$ 32,600		$ 32,600
Loan maturity date		Dec. 1, 2029
[1]	Mortgage is cross collateralized by the four properties.
[2]	Reflects effective rate of debt, including deferred financing costs, comprised of the cost of terminated treasury lock agreements (if any), debt initiation costs, mark-to-market adjustment of acquired debt and other transaction costs, as applicable.
[3]	The loan was not repaid at maturity and the Company has begun discussions with the lender regarding potential options in satisfaction of the obligation.
[4]	On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satsfactions of its obligations. See Note 3: Recent Transactions.
[5]	On May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligations. See Note 3: Recent Transactions.
[6]	On March 27, 2015, the Company repaid these loans at par, using borrowings on the Company's unsecured revolving credit facility.
[7]	The mortgage loan originally matured on May 1, 2013. The maturity date was extended until May 1, 2015 with the same interest rate. Excess cash flow, as defined, is being held by the lender for re-leasing costs. The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity. The mortgage loan was not repaid on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan.
[8]	The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in August 2013. The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013.
[9]	The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in January 2015.
[10]	The Company owns a 50 percent tenants-in-common interest in the Curtis Center property. The Company's $64.0 million loan consists of its 50 percent interest in a $102 million senior loan with a current rate of 3.480 percent at June 30, 2015 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.686 percent at June 30, 2015. The senior loan rate is based on a floating rate of one-month LIBOR plus 329 basis points and the mezzanine loan rate is based on a floating rate of one-month LIBOR plus 950 basis points. The Company has entered into LIBOR caps for the periods of the loans. The loans provide for three one-year extension options.
[11]	The effective interest rate includes amortization of deferred financing costs of 1.362 percent.
[12]	Mortgage is cross collateralized by seven properties. The Company has agreed, subject to certain conditions, to guarantee repayment of $61.1 million of the loan.
[13]	This construction loan has a maximum borrowing capacity of $28.8 million.
[14]	Mortgage is collateralized by the three properties comprising One River Center.
[15]	The effective interest rate includes amortization of deferred financing costs of 0.122 percent.

Mack-Cali Realty, L.P's Partn57

Mack-Cali Realty, L.P's Partners' Capital (Repurchase Of General Partner Units And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($)	1 Months Ended	6 Months Ended
	Sep. 30, 2012	Jun. 30, 2015
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Capacity of share repurchase program		$ 150,000,000
Shares purchased and retired	394,625
Aggregate cost of stock repurchased	$ 11,000,000
Capacity available for additional repurchase of outstanding common stock		$ 139,000,000
Common units purchased from the Company	394,625
Cost of units purchased from the company	$ 11,000,000
Share repurchase program initiation date		September 2,012
Dividend Reinvestment And Stock Purchase Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Common stock reserved for future issuance		5,500,000
Monthly cash investment without restriction, maximum		$ 5,000

Mack-Cali Realty, L.P's Partn58

Mack-Cali Realty, L.P's Partners' Capital (Stock Option Plans) (Narrative) (Details)	Jun. 05, 2015item$ / sharesshares	Jun. 30, 2015USD ($)$ / sharesshares	Jun. 30, 2014USD ($)shares	Jun. 30, 2015USD ($)$ / sharesshares	Jun. 30, 2014USD ($)shares	Dec. 31, 2014	May. 31, 2013shares	May. 31, 2004shares
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock option terms				10 years
Weighted average remaining contractual life				9 years 9 months 18 days		4 years 10 months 24 days
Share price | $ / shares	$ 17.31	$ 3.06		$ 3.06
Options exercised		0	0	0	0
Stock options expense | $		$ 62,000	$ 1,000	$ 63,000	$ 2,000
Shares under options - Granted	800,000			800,000
Common stock trade share price | $ / shares	$ 25
Annual Installments | item	3
Exercisable period				10 years
Common stock trading days				30 days
2013 Incentive Stock Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance							4,600,000
2004 Incentive Stock Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance								2,500,000
Shares issued		0		0
2000 Employee Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Exercisable time period				5 years
2000 Director Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Exercisable time period				1 year
Maximum [Member] | 2000 Employee Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		4,000,000		4,000,000
Maximum [Member] | 2000 Director Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		350,000		350,000
Maximum [Member] | Employee And Director Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		4,350,000		4,350,000
Minimum [Member] | 2000 Employee Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		2,500,000		2,500,000
Minimum [Member] | 2000 Director Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		200,000		200,000
Minimum [Member] | Employee And Director Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Reserved stocks for issuance		2,700,000		2,700,000
Three Equal Annual Installment [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares under options - Granted	400,000
Common Stock Trades [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares under options - Granted	400,000

Mack-Cali Realty, L.P's Partn59

Mack-Cali Realty, L.P's Partners' Capital (Restricted Stock Awards, Performance Share Units/TSR-Based Awards) (Narrative) (Details) $ / shares in Units, $ in Millions	Jun. 05, 2015shares	May. 11, 2015shares	Sep. 12, 2012shares	Jun. 30, 2015USD ($)item$ / sharesshares	Dec. 31, 2013shares	Dec. 31, 2014shares
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Number of executive officers who departed | item				2
Shares vested				37,392
Unvested restricted stock outstanding				350,888		346,946
Shares issued				45,062
Total unrecognized compensation cost | $				$ 3.1
Total unrecognized compensation cost, period of recognition				2 years
Number of common shares received upon redemption of common units				1
Shares granted				41,337
Restricted Stock [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Unvested restricted stock outstanding				313,337
Restricted stock awards unvested shares outstanding performance contingent				210,000
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				3 years
Shares granted	37,550.54
Restricted Stock [Member] | Maximum [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				7 years
Restricted Stock [Member] | Minimum [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				1 year
Performance Shares [Member] | 2013 Incentive Stock Plan [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares granted	112,651.64
Performance period				3 years
Performance Shares [Member] | Maximum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Percentage Of Shares Vested	150.00%
Performance Shares [Member] | Minimum [Member] | 2013 Incentive Stock Plan [Member] | Three Years Period Award [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Percentage Of Shares Vested	0.00%
Ratified Restricted Stock Awards [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares vested				109,667
Shares granted			319,667
Ratified Restricted Stock Awards [Member] | Maximum [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				7 years
Ratified Restricted Stock Awards [Member] | Minimum [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				5 years
Total Stockholder Return Based Awards [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Stock compensation vesting period				4 years
Shares vested				357
Shares granted and vested				528
Value of common stock received upon vesting of awards | $ / shares				$ 1,000
Shares granted			5,160		1,032
Employee Severance [Member] | Performance Shares [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares vested				84,000
Shares granted and vested				126,000
Messr Hersh [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares vested		210,000
Messr Hersh [Member] | Total Stockholder Return Based Awards [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Shares vested		675
Shares issued		41,811

Mack-Cali Realty, L.P's Partn60

Mack-Cali Realty, L.P's Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Maximum percentage of retainer fee that directors may defer	100.00%
Deferred stock units earned	10,264	10,245
Director stock units outstanding	167,763		157,730

Mack-Cali Realty, L.P's Partn61

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit) (Narrative) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			410,000	10,000
Unvested restricted stock outstanding	350,888		350,888		346,946
Common Stock, Dividends, Per Share, Declared	$ 0.15	$ 0.15	$ 0.30	$ 0.45
Unvested Restricted Stock [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Unvested restricted stock outstanding	103,337	304,816	103,337	304,816

Mack-Cali Realty, L.P's Partn62

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Stock Option Plans) (Details) - USD ($)	Jun. 05, 2015	Jun. 30, 2015
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Shares Under Options - Outstanding, beginning balance		10,000
Shares under options - Granted	800,000	800,000
Shares Under Options - Outstanding, ending balance		810,000
Shares Under Options - Options exercisable		5,000
Shares Under Options - Available for grant		3,413,699
Weighted Average Exercise Price - Outstanding, beginning balance		$ 33.36
Weighted Average Exercise Price - Granted		17.31
Weighted Average Exercise Price - Outstanding, ending balance		$ 17.51
Aggregate Intrinsic Value - Outstanding, ending balance		$ 746
Outstanding stock option price range, lower range		$ 17.31
Outstanding stock option price range, upper range		$ 45.47

Mack-Cali Realty, L.P's Partn63

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Weighted Average Assumptions) (Details) - Jun. 30, 2015	Total	Total
Time Vesting Options [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Expected life (in years)	6 years	6 years
Risk-free interest rate	2.04%	2.04%
Volatility	29.00%	29.00%
Dividend yield	3.50%	3.50%
Price Vesting Options [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Expected life (in years)	5 years 9 months 18 days	5 years 9 months 18 days
Risk-free interest rate	1.96%	1.96%
Volatility	29.00%	29.00%
Dividend yield	3.50%	3.50%

Mack-Cali Realty, L.P's Partn64

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Restricted Stock Awards) (Details) - 6 months ended Jun. 30, 2015 - $ / shares	Total
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Unvested restricted stock outstanding, beginning balance	346,946
Shares, Granted	41,337
Shares, Vested	(37,392)
Shares, Forfeited	(3)
Unvested restricted stock outstanding, ending balance	350,888
Weighted-Average Grant - Date Fair Value, Outstanding beginning balance	$ 21.09
Weighted-Average Grant - Date Fair Value, Granted	17.51
Weighted-Average Grant - Date Fair Value, Vested	21.59
Weighted-Average Grant - Date Fair Value, Forfeited	26.36
Weighted-Average Grant - Date Fair Value, Outstanding ending balance	$ 20.61

Mack-Cali Realty, L.P's Partn65

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit Tables - Basic Computation Of EPU) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Net income (loss)	$ 39,389	$ 57,347	$ 36,064	$ 39,719
Add: Noncontrolling interest in consolidated joint ventures	373	290	863	612
Net income available to common unitholders	$ 39,762	$ 57,637	$ 36,927	$ 40,331
Weighted average common units	100,272	99,993	100,269	99,935
Net income available to common unitholders	$ 0.40	$ 0.58	$ 0.37	$ 0.40

Mack-Cali Realty, L.P's Partn66

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit Tables - Diluted Computation Of EPU) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Net income available to common unitholders	$ 39,762	$ 57,637	$ 36,927	$ 40,331
Weighted average common unit	100,314	100,023	100,313	99,964
Net income available to common unitholders	$ 0.40	$ 0.58	$ 0.37	$ 0.40

Mack-Cali Realty, L.P's Partn67

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Reconciliation Of Units Used In Basic EPU Calculation To Units Used In Diluted EPU Calculation) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]
Basic EPU units	100,272	99,993	100,269	99,935
Add: Restricted Stock Awards	42	30	44	29
Diluted EPU Units	100,314	100,023	100,313	99,964

Noncontrolling Interests In C68

Noncontrolling Interests In Consolidated Joint Ventures (Narrative) (Details) - Jun. 30, 2015 - Participation Rights [Member] - Entity [Domain] - property	Total
Noncontrolling Interest [Line Items]
Number of properties	3
Percentage of excess net cash flow	50.00%
Internal rate of return	10.00%
Future Developments [Member]
Noncontrolling Interest [Line Items]
Number of properties	1

Noncontrolling Interest In Co69

Noncontrolling Interest In Consolidated Joint Ventures (Schedule Of Activity Of Noncontrolling Interests) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Noncontrolling Interest [Line Items]
Increase in noncontrolling interests	$ 158
Noncontrolling Interest In Consolidated Joint Ventures [Member]
Noncontrolling Interest [Line Items]
Balance, value	55,057	$ 55,283
Net income	(863)	(612)
Increase in noncontrolling interests	158	35
Balance, value	$ 54,352	$ 54,706

Employee Benefit 401(k) Plans70

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Minimum employee subscription rate, percentage of compensation			1.00%
Maximum employee subscription rate, percentage of compensation			60.00%
Employee pre-tax contributions vested percentage			100.00%
Vesting rate			20.00%
Percentage vested after total service period			100.00%
Employees' vesting rights			The Corporation did not make any contributions to the 401(k) plan in the six months ended June 30, 2015. Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Corporation at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Corporation.
Expenses for employee benefit plan	$ 0	$ 27,000	$ 0	$ 53,000
Minimum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer contribution vesting period			2 years
Maximum [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employer contribution vesting period			6 years
Messr Hersh [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Cash payment on separation date	2,300,000		$ 2,300,000
Messr Lefkowitz And Messr Thomas [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expenses for employee benefit plan			1,200,000
Deferred Retirement Compensation Units [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expenses for employee benefit plan	$ 0	$ 142,000	$ 0	$ 1,300,000

Disclosure Of Fair Value Of F71

Disclosure Of Fair Value Of Financial Instruments (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Disclosure Of Fair Value Of Financial Instruments [Abstract]
Fair value of Company's long-term debt	$ 2,046,116,000	$ 2,133,214,000
Book value of Company's long-term debt	$ 2,034,819,000	$ 2,088,654,000

Commitments And Contingencies72

Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - Entity [Domain] - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Harborside Financial Center Plaza 4A [Member]
Commitments And Contingencies [Line Items]
Project period			20 years
Percentage of PILOT on project costs			2.00%
Total project costs	$ 49,500,000		$ 49,500,000
Payments in lieu of property taxes (PILOT)	247,000	$ 247,000	$ 495,000	$ 495,000
Harborside Financial Center Plaza 5 [Member]
Commitments And Contingencies [Line Items]
Project period			20 years
Percentage of PILOT on project costs			2.00%
Total project costs	170,900,000		$ 170,900,000
Payments in lieu of property taxes (PILOT)	$ 854,000	$ 854,000	$ 1,700,000	$ 1,700,000
Port Imperial South 4/5 [Member]
Commitments And Contingencies [Line Items]
Project period			5 years
Period of real estate taxes phase in			5 years
Park Square [Member]
Commitments And Contingencies [Line Items]
Period of partial abatement of real estate taxes			4 years

Commitments And Contingencies73

Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Commitments And Contingencies [Abstract]
Ground lease expense incurred	$ 102,000	$ 102,000	$ 203,000	$ 203,000

Commitments And Contingencies74

Commitments And Contingencies (Roseland Contingent Consideration) (Narrative) (Details) - Roseland Partners, L.L.C. [Member] - USD ($) $ in Millions	Jun. 30, 2015	Oct. 23, 2012
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration	$ 0.9	$ 10
Completion/Start Of Certain Developments [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	92.00%
Completion/Start Of Certain Developments [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	99.00%
Obtaining Of Tax Credits/Grants [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	50.00%

Commitments And Contingencies75

Commitments And Contingencies (Departure Of Executive Officer) (Narrative) (Details)	May. 11, 2015USD ($)itemshares	Jun. 30, 2015USD ($)shares	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Commitments And Contingencies [Line Items]
Severance benefits | $			$ 11,000,000	$ 23,800,000
Restricted stock units vested		37,392
Shares issued		45,062
Accounts payable, accrued expenses and other liabilities | $		$ 134,089,000		126,971,000
Employee Severance [Member]
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other liabilities | $		$ 11,600,000		$ 11,600,000
Messr Hersh [Member]
Commitments And Contingencies [Line Items]
Severance benefits | $	$ 8,000,000
Restricted stock units vested	210,000
Period for continuation of health insurance	48 months
Cash payment | $	$ 504,000
Termination payment multiplier | item	210,000
Deferred retirement compensation contribution | $	$ 2,311,792
Total Stockholder Return Based Awards [Member]
Commitments And Contingencies [Line Items]
Restricted stock units vested		357
Total Stockholder Return Based Awards [Member] | Messr Hersh [Member]
Commitments And Contingencies [Line Items]
Restricted stock units vested	675
Shares issued	41,811

Commitments And Contingencies76

Commitments And Contingencies (Other) (Narrative) (Details) $ in Thousands		Apr. 01, 2015USD ($)item	Jun. 30, 2015USD ($)ft²propertyitem	Jun. 30, 2014USD ($)
Commitments And Contingencies [Line Items]
Investment in unconsolidated joint ventures			$ 49,305	$ 38,948
Mortgage loan, maturity date			Aug. 1, 2029
Purchase price of property			$ 42,881	$ 41,825
Harborside Unit A Urban Renewal, LLC [Member]
Commitments And Contingencies [Line Items]
Number of units | item			763
Total project costs			$ 320,000
Costs of the project incurred			$ 128,400
Delivery date to tenant			fourth quarter of 2016
Interest rate	[1]		5.197%
Percentage of interest in venture			85.00%
Mortgage loan, maturity date			Aug. 1, 2029
Harborside Unit A Urban Renewal, LLC [Member] | Construction/Permanent Loan [Member]
Commitments And Contingencies [Line Items]
Maximum borrowing capacity			$ 192,000
Parent Company [Member] | Harborside Unit A Urban Renewal, LLC [Member]
Commitments And Contingencies [Line Items]
Total project costs			$ 17,400
Property Lock-Ups [Member]
Commitments And Contingencies [Line Items]
Number of properties | property			7
Properties aggregate net book value			$ 124,300
Expiration year			2,016
Property Lock-Ups Expired [Member]
Commitments And Contingencies [Line Items]
Number of properties | property			110
Properties aggregate net book value			$ 1,300,000
Wegmans Food Markets, Inc. [Member]
Commitments And Contingencies [Line Items]
Total project costs			28,700
Costs of the project incurred			$ 11,500
Delivery date to tenant			first quarter of 2017
Area of property (in square feet) | ft²			140,000
Eastchester Project [Member]
Commitments And Contingencies [Line Items]
Number of units | item			108
Total project costs			$ 50,000
Delivery date to tenant			second quarter of 2016
Percentage of interest in venture			76.25%
Investment in unconsolidated joint ventures			$ 8,200
Project Costs Incurred To Date			18,400
Eastchester Project [Member] | Construction Loan [Member]
Commitments And Contingencies [Line Items]
Maximum borrowing capacity			28,800
Outstanding borrowings under the facility			$ 3,500
City Square Project [Member]
Commitments And Contingencies [Line Items]
Number of units | item		365
Total project costs		$ 91,400
Purchase price of property		3,100
Contingent consideration		$ 1,250
Minimum project start period		12 months	12 months
[1]	The construction/permanent loan has a maximum borrowing amount of $192,000.

Commitments And Contingencies77

Commitments And Contingencies (Future Minimum Rental Payments Of Ground Leases) (Details) $ in Thousands	Jun. 30, 2015USD ($)
Commitments And Contingencies [Abstract]
July 1 through December 31, 2015	$ 198
2,016	387
2,017	267
2,018	232
2,019	235
2020 through 2084	15,583
Total	$ 16,902

Tenant Leases (Details)

Tenant Leases (Details) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Property Subject to or Available for Operating Lease [Line Items]
July 1 through December 31, 2015	$ 223,162
2,016	441,825
2,017	392,032
2,018	308,731
2,019	250,839
2020 and thereafter	997,712
Total	$ 2,614,301
Tenant Leases [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating leases with various expiration dates through year	Dec. 31, 2035
Multi-Family Properties [Member]
Property Subject to or Available for Operating Lease [Line Items]
Lease period	1 year

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	6 Months Ended
	Jun. 30, 2015USD ($)segment	Jun. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	3
Foreign Locations [Member]
Segment Reporting Information [Line Items]
Revenue	$ 0	$ 0
Long lived assets	$ 0		$ 0

Segment Reporting (Selected Res

Segment Reporting (Selected Results Of Operations And Asset Information) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended				18 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues		$ 148,567		$ 160,300		$ 302,282		$ 329,896
Total operating and interest expenses	[1]	105,331		113,269		218,184		254,273
Equity in earnings (loss) of unconsolidated joint ventures		(2,329)		443		(5,858)		(792)
Net operating income (loss)	[2]	40,907		47,474		78,240		74,831
Total assets		4,153,465				4,153,465				$ 4,153,465	$ 4,192,247
Total long-lived assets	[3]	3,600,128				3,600,128				3,600,128	3,670,704
Investments in unconsolidated joint ventures		284,507				284,507				284,507	247,468
Corporate & Other, Including Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	[4]	(1,157)		(4,309)		(2,015)		(8,037)
Total operating and interest expenses	[1],[4]	27,250		29,578		54,929		70,791
Net operating income (loss)	[2],[4]	(28,407)		(33,887)		(56,944)		(78,828)
Total assets	[4]	40,243				40,243				40,243	52,601
Total long-lived assets	[3],[4]	(1,270)				(1,270)				(1,270)	3,482
Real Estate - Commercial And Other [Member]
Segment Reporting Information [Line Items]
Total revenues		134,613		150,877		274,217		311,450
Total operating and interest expenses	[1]	64,158		72,303		136,008		159,236
Equity in earnings (loss) of unconsolidated joint ventures		798		1,829		(570)		2,817
Net operating income (loss)	[2]	71,253		80,403		137,639		155,031
Total assets		3,384,979				3,384,979				3,384,979	3,636,126
Total long-lived assets	[3]	3,100,539				3,100,539				3,100,539	3,344,840
Investments in unconsolidated joint ventures		77,841				77,841				77,841	81,649
Real Estate - Multi Family [Member]
Segment Reporting Information [Line Items]
Total revenues		6,842		6,329		13,579		12,132
Total operating and interest expenses	[1]	4,872		3,006		8,541		5,705
Equity in earnings (loss) of unconsolidated joint ventures		(3,336)		(2,255)		(5,497)		(4,478)
Net operating income (loss)	[2]	(1,366)		1,068		(459)		1,949
Total assets		718,470				718,470				718,470	492,362
Total long-lived assets	[3]	497,095				497,095				497,095	318,524
Investments in unconsolidated joint ventures		206,256				206,256				206,256	164,912
Multi Family Services [Member]
Segment Reporting Information [Line Items]
Total revenues		8,269	[5]	7,403	[6]	16,501	[7]	14,351	[8]
Total operating and interest expenses	[1]	9,051		8,382		18,706		18,541
Equity in earnings (loss) of unconsolidated joint ventures		209		869		209		869
Net operating income (loss)	[2]	(573)		(110)		(1,996)		$ (3,321)
Total assets		9,773				9,773				9,773	11,158
Total long-lived assets	[3]	3,764				3,764				3,764	3,858
Investments in unconsolidated joint ventures		410				410				410	$ 907
Fee revenue		$ 1,556		$ 935		$ 2,831				$ 1,800
[1]	Total operating and interest expenses represent the sum of: real estate taxes; utilities; operating services; direct construction costs; real estate services expenses; general and administrative and interest expense (net of interest income). All interest expense, net of interest and other investment income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods.
[2]	Net operating income represents total revenues less total operating and interest expenses (as defined in Note "a"), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.
[3]	Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill.
[4]	Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense, construction services revenue and direct construction costs) as well as intercompany eliminations necessary to reconcile to consolidated Company totals.
[5]	Includes $1,556 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[6]	Includes $935 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[7]	Includes $2,831 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[8]	Includes $1,800 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.

Segment Reporting (Schedule Of

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting [Abstract]
Net operating income	[1]	$ 40,907	$ 47,474	$ 78,240	$ 74,831
Depreciation and amortization		(42,365)	(44,711)	(83,167)	(89,696)
Realized gains on disposition of rental property, net		34,399	54,584	34,543	54,584
Gain on sale of investment in unconsolidated joint venture		6,448		6,448
Net income		39,389	57,347	36,064	39,719
Noncontrolling interest in consolidated joint ventures		373	290	863	612
Net income available to common unitholders		$ 39,762	$ 57,637	$ 36,927	$ 40,331
[1]	Net operating income represents total revenues less total operating and interest expenses (as defined in Note "a"), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.