Veris Residential (VRE) 10-Q 28 Oct 15 2015 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 26, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	MACK CALI REALTY CORP
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Entity Central Index Key	924,901
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Entity Common Stock, Shares Outstanding		89,310,574

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Rental property
Land and leasehold interests	$ 706,122	$ 760,855
Buildings and improvements	3,619,200	3,753,300
Tenant improvements	398,812	431,969
Furniture, fixtures and equipment	13,582	12,055
Gross investment in rental property	4,737,716	4,958,179
Less - accumulated depreciation and amortization	(1,434,603)	(1,414,305)
Net investment in rental property	3,303,113	3,543,874
Cash and cash equivalents	30,866	29,549
Investments in unconsolidated joint ventures	299,486	247,468
Unbilled rents receivable, net	118,466	123,885
Deferred charges, goodwill and other assets, net	200,723	204,650
Restricted cash	40,068	34,245
Accounts receivable, net of allowance for doubtful accounts of $1,579 and $2,584	9,180	8,576
Total assets	4,001,902	4,192,247
LIABILITIES AND EQUITY
Senior unsecured notes	1,268,568	1,267,744
Revolving credit facility	35,000
Mortgages, loans payable and other obligations	740,024	820,910
Dividends and distributions payable	15,582	15,528
Accounts payable, accrued expenses and other liabilities	136,673	126,971
Rents received in advance and security deposits	47,645	52,146
Accrued interest payable	27,413	26,937
Total liabilities	$ 2,270,905	$ 2,310,236
Commitments and contingencies
Mack-Cali Realty Corporation stockholders' equity:
Common stock, $0.01 par value, 190,000,000 shares authorized 89,310,243 and 89,076,578 shares outstanding	$ 893	$ 891
Additional paid-in capital	2,565,143	2,560,183
Dividends in excess of net earnings	(1,070,456)	(936,293)
Total Mack-Cali Realty Corporation stockholders' equity	1,495,580	1,624,781
Noncontrolling interests in subsidiaries:
Operating Partnership	180,691	202,173
Consolidated joint ventures	54,726	55,057
Total noncontrolling interests in subsidiaries	235,417	257,230
Total equity	1,730,997	1,882,011
Total liabilities and equity	$ 4,001,902	$ 4,192,247

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts receivable	$ 1,579	$ 2,584
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	190,000,000	190,000,000
Common stock, shares outstanding	89,310,243	89,076,578

Consolidated Statements Of Oper

Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
REVENUES
Base rents	$ 119,707	$ 125,793	$ 364,746	$ 393,054
Escalations and recoveries from tenants	15,050	19,172	49,291	61,736
Real estate services	7,510	7,622	22,555	21,323
Parking income	2,749	2,255	8,141	6,605
Other income	1,142	647	3,707	2,667
Total revenues	146,158	155,489	448,440	485,385
EXPENSES
Real estate taxes	19,143	22,154	63,005	69,880
Utilities	13,172	15,701	44,146	58,555
Operating services	24,535	26,519	78,607	83,581
Real estate services expenses	6,673	6,933	19,520	20,213
General and administrative	13,670	12,665	36,669	49,219
Depreciation and amortization	44,099	41,983	127,266	131,679
Impairments	164,176		164,176
Total expenses	285,468	125,955	533,389	413,127
Operating income (loss)	(139,310)	29,534	(84,949)	72,258
OTHER (EXPENSE) INCOME
Interest expense	(24,689)	(27,353)	(78,677)	(85,458)
Interest and other investment income	5	908	563	2,216
Equity in earnings (loss) of unconsolidated joint ventures	3,135	(1,268)	(2,723)	(2,060)
Realized gains (losses) on disposition of rental property, net	18,718	264	53,261	54,848
Gain on sale of investment in unconsolidated joint ventures			6,448
Total other (expense) income	(2,831)	(27,449)	(21,128)	(30,454)
Net income (loss)	(142,141)	2,085	(106,077)	41,804
Noncontrolling interest in consolidated joint ventures	281	(145)	(582)	(757)
Noncontrolling interest in Operating Partnership	15,530	(248)	11,461	(4,754)
Net income (loss) available to common shareholders	$ (126,892)	$ 1,982	$ (94,034)	$ 37,807
Basic earnings per common share:
Net income available to common shareholders	$ (1.42)	$ 0.02	$ (1.05)	$ 0.43
Diluted earnings per common share:
Net income (loss) available to common shareholders	$ (1.42)	$ 0.02	$ (1.05)	$ 0.43
Basic weighted average shares outstanding	89,249	88,875	89,229	88,621
Diluted weighted average shares outstanding	100,172	100,052	100,236	100,014

Consolidated Statement Of Chang

Consolidated Statement Of Changes In Equity - 9 months ended Sep. 30, 2015 - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Dividends In Excess Of Net Earnings [Member]	Noncontrolling Interests In Subsidiaries [Member]	Total
Balance, value at Dec. 31, 2014	$ 891	$ 2,560,183	$ (936,293)	$ 257,230	$ 1,882,011
Balance, shares at Dec. 31, 2014	89,077
Net income (loss)			(94,034)	(12,043)	(106,077)
Common stock dividends			(40,129)		(40,129)
Common unit distributions				(4,927)	(4,927)
Increase in noncontrolling interest in consolidated joint ventures				251	251
Redemption of common units for common stock, value	$ 3	5,367		(5,370)
Redemption of common units for common stock, shares	294
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value		54			54
Shares issued under Dividend Reinvestment and Stock Purchase Plan, shares	2
Directors' deferred compensation plan, value		297			297
Stock compensation, value		1,556			1,556
Stock compensation, shares	46
Cancellation of shares, value	$ (1)	(2,038)			(2,039)
Cancellation of shares, shares	(109)
Rebalancing of ownership percentage between parent and subsidiaries		(276)		276
Balance, value at Sep. 30, 2015	$ 893	$ 2,565,143	$ (1,070,456)	$ 235,417	$ 1,730,997
Balance, shares at Sep. 30, 2015	89,310

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ (106,077)	$ 41,804
Adjustments to reconcile net income to net cash provided by Operating activities:
Depreciation and amortization, including related intangible assets	128,422	132,698
Amortization of deferred stock units	297	309
Amortization of stock compensation	1,500	6,439
Amortization of deferred financing costs	2,846	2,306
Amortization of debt discount and mark-to-market	2,791	5,502
Equity in (earnings) loss of unconsolidated joint venture, net	2,723	2,060
Distributions of cumulative earnings from unconsolidated joint ventures	3,145	10,974
Realized (gains) loss on disposition of rental property, net	(53,261)	(54,848)
Realized (gains) loss on sale of investment in unconsolidated joint ventures	(6,448)
Impairments	164,176
Changes in operating assets and liabilities:
Decrease (increase) in unbilled rents receivable, net	17	(4,477)
Increase in deferred charges, goodwill and other assets	(23,387)	(28,544)
Increase in accounts receivable, net	(603)	(1,911)
Increase in accounts payable, accrued expenses and other liabilities	5,298	13,565
Decrease in rents received in advance and security deposits	(4,502)	(5,938)
Increase (decrease) in accrued interest payable	7,751	(4,440)
Net cash provided by operating activities	124,688	115,499
CASH FLOWS FROM INVESTING ACTIVITIES
Rental property acquisitions and related intangibles	(6,057)	(46,883)
Rental property additions and improvements	(59,700)	(77,109)
Development of rental property and other related costs	(49,959)	(4,881)
Proceeds from the sales of rental property	81,049	274,839
Proceeds from the sale of investment in unconsolidated joint venture	6,448
Investments in notes receivable		(62,276)
Repayment of notes receivable	7,750	10,250
Investment in unconsolidated joint ventures	(68,468)	(57,568)
Distributions in excess of cumulative earnings from unconsolidated joint ventures	4,329	36,303
Increase in restricted cash	5,823	6,777
Net cash (used in) provided by investing activities	(90,431)	65,898
CASH FLOW FROM FINANCING ACTIVITIES
Borrowings from revolving credit facility	179,000	262,328
Repayment of revolving credit facility	(144,000)	(262,328)
Repayment of senior unsecured notes		(200,000)
Proceeds from mortgages and loans payable	6,193	28,350
Repayment of mortgages, loans payable and other obligations	(29,307)	(44,825)
Payment of contingent consideration		(5,228)
Payment of financing costs	(98)	(1,021)
Cash from noncontrolling interests	251
Payment of dividends and distributions	(44,979)	(74,851)
Net cash used in financing activities	(32,940)	(297,575)
Net increase (decrease) in cash and cash equivalents	1,317	(116,178)
Cash and cash equivalents, beginning of period	29,549	221,706
Cash and cash equivalents, end of period	$ 30,866	$ 105,528

Organization And Basis Of Prese

Organization And Basis Of Presentation	9 Months Ended
	Sep. 30, 2015
Organization And Basis Of Presentation [Abstract]
Organization And Basis Of Presentation	1. ORGANIZATION AND BASIS OF PRESENTATION Organization Mack-Cali Realty Corporation, a Maryland corporation, together with its subsidiaries (collectively, the “Company”), is a fully-integrated, self-administered, self-managed real estate investment trust (“REIT”) providing leasing, management, acquisition, development, construction and tenant-related services for its properties and third parties. As of September 30, 2015 , the Company owned or had interests in 274 properties, consisting of 146 office and 109 flex properties, totaling approximately 29.7 million square feet, leased to approximately 1,900 commercial tenants, and 19 multi-family rental properties containing 5,644 residential units, plus developable land (collectively, the “Properties”). The Properties are comprised of 146 office buildings totaling approximately 24.4 million square feet (which include 36 buildings, aggregating approximately 5.6 million square feet owned by unconsolidated joint ventures in which the Company has investment interests), 94 office/flex buildings totaling approximately 4.8 million square feet, 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, which consist principally of Mack-Cali Realty, L.P. (the “Operating Partnership”), 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 (i) the ability to make decisions about the entity's activities through voting or similar rights, (ii) the obligation to absorb the expected losses of the entity, or (iii) the right to receive the expected residual returns of the entity; (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 September 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 $254 million and $242.9 million, respectively, mortgages of $100.7 million and $94.3 million, respectively, and other liabilities of $17.5 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	9 Months Ended
	Sep. 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 $ 0.9 million and $ 1.0 million for the three months ended September 30, 2015 and 2014 , respectively, and $3.5 million and $ 2.7 million for the nine months ended September 30, 2015 and 2014, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $ 103.1 million and $ 62.8 million as of September 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 value 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. See Note 3: Recent Transactions – Impairments on Properties Held and Used. 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 value 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 value 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 $ 945,000 and $ 778,000 for the three months ended September 30, 2015 and 2014 , respectively, and $2,846,000 and $2,306,000 for the nine months ended September 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 es ) from early extinguishment of debt. No such unamortized costs were written off for the nine months ended September 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 Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which is capitalized and amortized, was approximate ly $ 922,000 and $ 940,000 for the three months ended September 30, 2015 and 2014 , respectively, and approximately $2,738,000 and $2,816,000 for the nine months ended September 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 value 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 value . If , based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value , then performing the additional two-step impairment test is unnecessary. If the carrying value 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 13: 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 has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). As a REIT, the Company generally will not be subject to corporate federal income tax (including alternative minimum tax) on net income that it currently distributes to its shareholders, provided that the Company satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the Company retains and does not distribute any net capital gains, the Company will be required to pay federal, state and local taxes on such net capital gains at the rate applicable to capital gains of a corporation. The Company has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the Company 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 September 30, 2015 , the Company had a deferred tax asset related to its TRS activity with a balance of approximately $ 16.0 million which has been fully reserved for through a valuation allowance. If the Company fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates. The Company 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 September 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 Share The Company presents both basic and diluted earnings per share (“EPS”). Basic EPS excludes dilution and is computed by dividing net income available to common shareholders by the weighted average number of shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS from continuing operations amount. Shares whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares 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 shares included in diluted EPS shall be based on the number of shares, 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 shares that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares shall be included in the denominator of diluted EPS as of the beginning of the period (or as of the date of the grant, if later). Dividends and Distributions Payable The dividends and distributions payable at September 30, 2015 represents dividends payable to common shareholders ( 89,310,308 shares) and distributions payable to noncontrolling interest common unitholders of the Operating Partnership ( 10,790,142 common units) for all such holders of record as of October 5, 2015 with respect to the third quarter 2015 . The third quarter 2015 common stock dividends and common unit distributions of $ 0.15 per common share and unit were approved by the Board of Directors on September 22, 2015 and paid on October 15, 2015 . The dividends and distributions payable at December 31, 2014 represents dividends payable to common shareholders ( 88,866,652 shares) and distributions payable to noncontrolling interest common unitholders of the Operating Partnership ( 11,083,876 common units) for all such holders of record as of January 6, 2015 with respect to the fourth quarter 2014 . The fourth quarter 2014 common stock dividends and common unit distributions of $ 0.15 per common share and unit were approved by the Board of Directors on December 9, 2014 and paid on January 14, 2015 . Costs Incurred For Stock Issuances Costs incurred in connection with the Company’s stock issuances are reflected as a reduction of additional paid ‑in 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 $ 695,000 and $ 830,000 for the three months ended September 30, 2015 and 2014 , respectively, and $1,500,000 and $5,094,000 for the nine months ended September 30, 2015 and 2014, respectively. The amount for the nine months ended September 30, 2014 included $ 3,150,000 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 nine months ended September 30, 2015 and 2014 , and no accumulated other comprehensive income as of September 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 that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this update. Debt issuance costs related to revolving lines of credit are not within the scope of this new guidance. Additionally, in August 2015 the FASB issued guidance expanding the April 2015 update (ASU 2015-15) . It states that, given the absence of authoritative guidance within the update, the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset for revolving lines of credit and subsequently amortizing the deferred debt issuance costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings on the line of credit. This g

Recent Transactions

Recent Transactions	9 Months Ended
	Sep. 30, 2015
Recent Transactions [Abstract]
Recent Transactions	3. RECENT TRANSACTIONS Acquisition s On October 23 , 2015, the Company signed an agreement to acquire a 196,000 square-foot office property located in Edison, New Jersey, for approximately $53. 1 million, subject to certain conditions. The acquisition is expected to be completed in the fourth quarter of 2015 . On April 1, 2015, the Company acquired vacant land to accommodate a two-phase 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 September 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 first phase with 237 units start ed construction in the third quarter 2015 with anticipated initial deliveries in the second quarter 2017. The second phase, with 128 units, is projected to begin construction in 2017. T otal development costs are estimated to be approximately $92.5 million (of which $7.1 million was incurred by the Company through September 30, 2015). For the nine months ended September 30, 2015, included in general and administrative expense was approximately $111,000 in transaction costs related to this acquisition . 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 Rosewood Lafayette Holdings L.L.C., a joint venture which owns the Highlands at Morristown Station, a 217 -unit multi-family property located in Morristown, New Jersey, to its joint venture partner with a gain on the sale of approximately $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 three months ended September 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 5 Becker Farm Road in Roseland, New Jersey, aggregating 118,343 square feet, which was collateral for a $14.4 million mortgage loan scheduled to mature on May 11, 2016 , and 210 Clay Avenue in Lyndhurst, New Jersey, aggregating 121,203 square feet, which was collateral for a $13.8 million mortgage loan also scheduled to mature on May 11, 2016 . During the three months 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 these four properties totaling $25.2 million during the year ended December 3 1 , 2013. D uring the three and nine months ended September 30, 2015, t he Company recorded gain s on the disposal of the se office properties for a total of $18.7 million and $28.4 million, respectively. On January 1, 2014, the Company early adopted the new discontinued operations accounting standard and as the properties disposed of during the nine months ended September 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 (loss) for the three and nine month periods ended September 30, 2015 and 2014 from the properties disposed of during the nine months ended September 30, 2015 and the 16 properties sold during the year ended December 31, 2014: (dollars in thousands) Three Months Ended Nine Months Ended September 30, September 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest expense Income (loss) from properties disposed of $ $ $ $ Realized gains on dispositions Total income from properties disposed of $ $ $ $ Impairments on Properties Held and Used In September 2015, the Company announced a three -year strategic initiative to transform the Company into a more concentrated owner of New Jersey Hudson River waterfront and transit-oriented office properties and a regional owner of luxury multi-family residential properties. In connection with the transformation of the Company’s portfolio, management began developing a disposition plan in September 2015, which will be an ongoing assessment process. Through this plan, the Company, in the coming years, expects to dispose of primarily office properties considered non-core to its ongoing operations. As a result, at September 30, 2015, the Company evaluated the recoverability of the carrying values of these non-core properties, and determined that due to the shortening of the expected periods of ownership, it was necessary to reduce the carrying values of 22 rental properties to their estimated fair values. Accordingly, the Company recorded an impairment charge of $158.6 m illion at September 30, 2015 reducing the aggregate carrying values of these properties from $554.3 million to their estimated fair values of $395.7 million . Four of the Company’s office properties are collateral for a mortgage loan that matured on August 11, 2014, with a principal balance of $65.0 million as of September 30, 2015. The loan was not repaid at maturity and the Company is in discussions with the lender regarding potential options in satisfaction of the obligation (see Note 9: Mortgages, Loans Payable and Other Obligations). As of September 30, 2015, the Company estimated that the carrying value of three of these properties, aggregating 479,877 square feet and located in Roseland and Parsippany, New Jersey, may not be recoverable over their anticipated holding periods. In order to reduce the carrying values of the properties to their estimated fair values, the Company recorded impairment charges of $5.6 million at September 30, 2015, which resulted from the current decline in leasing activity and market rents of the properties identified. The Company had previously recorded impairment charges on these properties at September 30, 2013 of $ 12.5 million. 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 Company, effective immediately. The Company 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 Company 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 Company’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 Company’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 Company’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the Company’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 Company’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 Company for cause following expiration of the Employment Term).

Investments In Unconsolidated J

Investments In Unconsolidated Joint Ventures	9 Months Ended
	Sep. 30, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Investments In Unconsolidated Joint Ventures	4. INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES As of September 30, 2015 , the Company had an aggregate investment of approximately $299.5 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 September 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 September 30, 2015 , such debt had a total facility amount of $453.6 million of which the Company agreed to guarantee up to $62 million. As of September 30, 2015 , the outstanding balance of such debt totaled $268.3 million of which $53.1 million was guaranteed by the Company. The Company also posted a $3.6 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 $1.3 million and $1.9 million for such services in the three months ended September 30, 2015 and 201 4 , respectively , and $4.4 million and $5.1 million for the nine months ended September 30, 2015 and 2014, respectively, which are included in real estate services revenue for the periods presented. T he Company had $ 0.7 million and $1.0 million in accounts receivable due from its unconsolidated joint ventures as of September 30, 2015 and December 31, 2014 . Included in the Company’s investments in unconsolidated joint ventures as of September 30, 2015 are five 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 $ 168.4 million as of September 30, 2015 . The Company’s maximum exposure to loss as a result of its involvement with these VIEs is estimated to be approximately $ 202.1 million, which includes the Company’s current investment and estimated future funding commitments/guarantees of approximately $ 33.7 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 September 30, 2015 and December 31, 2014: (dollars in thousands , including footnotes ) Property Debt Number of Company's Carrying Value As of September 30, 2015 Apartment Units Effective September 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 % 08/01/25 % (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 September 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) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $6,489 , bears interest at 3.63 percent, matures in August 2018 ; 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 2016 . 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 with a maximum borrowing amount of $23,400 converted to a permanent loan on July 14, 2015 . See discussion in Recent Transactions following in this footnote. (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 $0.5 million to be drawn at September 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. See discussion in Recent Transactions following in this footnote. (v) Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023 ; principal balance of $85,521 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 $4.4 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 $41,849 bears interest at 4.95 percent and matures on July 1, 2017 ; principal balance of $72,329 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 value for this venture of $1,419 and $1,854 as of September 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 $60,498 , bears interest at 6.15 percent and matures in November 2016 , and (ii) loan with a balance of $3,594 , bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020 . The Company posted a $3.6 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 nine months ended September 30, 2015 a nd 2014 : (dollars in thousands) Three Months Ended Nine Months Ended September 30, September 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 September 30, 2015 and December 31, 2014 : (dollars in thousands) September 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 th e three and nine months ended September 30, 2015 and 2014 : (dollars in thousands) Three Months Ended Nine Months Ended September 30, September 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest expense Net loss $ $ $ $ Recent Transactions KEYSTONE-PENN On August 28, 2015, Rosetree KPG III, L.L.C., which owns a 236,417 square-foot two-building office property located in Media, Pennsylvania refinanced its $31.8 million loan and obtained a new $45.5 million mortgage loan. The Company received a distribution of $3.7 million as its share of the loan proceeds recognized as equity in earnings during the three and nine months ended September 30, 2015 (as a result of having no carrying value of its investment in the unconsolidated joint venture). RIVERPARK AT HARRISON I, L.L.C./RIVERPARK AT HARRISON On July 14, 2015, Riverpark at Harrison I, L.L.C. (“Riverpark”), which owns a 141 -unit multi-family rental property located in Harrison, New Jersey, refinanced the $23.4 million construction loan, and obtained a $30 million mortgage loan. The Company received a distribution of $1.7 million from the loan proceeds. Concurrent with the loan refinancing, the Company, which holds a 36 percent interest in Riverpark, and its venture partners that hold ownership interests aggregating 44 percent acquired the 20 percent interest of the remaining partner group for $2.1 million. As a result of the 20 percent redemption, the Company’s ownership interest increased to 45 percent with the remaining venture partners owning 55 percent. The Company has determined that the joint venture is not a VIE since the equity investment at risk is sufficient to permit Riverpark to finance its activities without additional financial support. As control is shared with the partners in accordance with the operating agreement, the Company will continue to have an unconsolidated joint venture interest in Riverpark under the provisions of ASC 810, Consolidation. ROSEWOOD LAFAYETTE HOLDINGS, L.L.C./HIGHLANDS AT MORRISTOWN STATION On June 1, 2015, the Company sold its 25 percent equity interest in Rosewood Lafayette Holdings L.L.C., a joint venture which owns the Highlands 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 . OVERLOOK RIDGE JV, LLC/QUARRYSTONE AT OVERLOOK RIDGE On May 13, 2015, LR Overlook Phase II, LLC, of which the Company h e ld 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.

Deferred Charges, Goodwill And

Deferred Charges, Goodwill And Other Assets, Net	9 Months Ended
	Sep. 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 September 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 September 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 $ 3.1 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 September 30, 2015 and December 31, 2014 (dollars in thousands): Fair Value Notional Strike Effective Expiration September 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 $12,000 and $92,000 during the three and nine months ended September 30, 2015 , respectively, which is included in interest and other investment income in the consolidated statements of operations.

Restricted Cash

Restricted Cash	9 Months Ended
	Sep. 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) September 30, December 31, Security deposits $ $ Escrow and other reserve funds Total restricted cash $ $

Senior Unsecured Notes

Senior Unsecured Notes	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Senior Unsecured Notes	7 . SENIOR UNSECURED NOTES A summary of the Company’s senior unsecured notes as of September 30, 2015 and December 31, 2014 is as follows: (dollars in thousands) September 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 September 30, 2015 .

Unsecured Revolving Credit Faci

Unsecured Revolving Credit Facility	9 Months Ended
	Sep. 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 Company will not make any excess distributions except to enable the Company 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 September 30, 2015 . As of September 30, 2015 , the Company had outstanding borrowings of $ 35 million under its unsecured revolving credit facility , and had no outstanding borrowings under the facility as of December 31, 2014.

Mortgages, Loans Payable And Ot

Mortgages, Loans Payable And Other Obligations	9 Months Ended
	Sep. 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 September 30, 2015 , 24 of the Company’s properties, with a total carrying value of approximately $ 917 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 September 30, 2015 . A summary of the Company’s mortgages, loans payable and other obligations as of September 30, 2015 and December 31, 2014 is as follows: (dollars in thousands) Effective September 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 % - - 10 Independence (c) Wells Fargo CMBS % - - 4 Sylvan (d) Wells Fargo CMBS % - - 210 Clay (e) Wells Fargo CMBS % - - 5 Becker (f) Wells Fargo CMBS % - - 6 Becker, 85 Livingston, Wells Fargo CMBS % $ 08/11/14 (h) 75 Livingston & 20 Waterview (g) 9200 Edmonston Road Principal Commercial Funding L.L.C. % 05/01/15 (i) Port Imperial South Wells Fargo Bank N.A. LIBOR+1.75 % 11/18/15 4 Becker 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 May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (d) On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (e) On July 21, 2015, the Company transferred the deed for 210 Clay to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (f) On August 24, 2015, the Company transferred the deed for 5 Becker to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (g) Mortgage is cross collateralized by the four properties. (h) The loan was not repaid at maturity and the Company is in discussions with the lender regarding potential options in satisfaction of the obligation. (i) 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 at maturity on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan. (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 3.501 percent at September 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 9.707 percent at September 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 nine months ended September 30, 2015 and 2014 was $ 85,019,000 and $ 92,096,000 , respectively. Interest capitalized by the Company for the nine months ended September 30, 2015 and 2014 was $ 11,744,000 and $ 10,650,000 , respectively (of which these amounts included $ 3,769,000 and $ 3,284,000 for the nine months ended September 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 September 30, 2015 , the Company’s total indebtedness of $ 2,043,592,000 (weighted average interest rate of 5.41 percent) was comprised of $ 177,839,000 of revolving credit facility borrowings and other variable rate mortgage debt (weighted average rate of 3.41 percent) and fixed rate debt and other obligations of $ 1,865,753,000 (weighted average rate of 5.60 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).

Employee Benefit 401(k) Plans A

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	9 Months Ended
	Sep. 30, 2015
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements [Abstract]
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	1 0 . EMPLOYEE BENEFIT 401(k) PLANS AND DEFERRED RETIREMENT COMPENSATION AGREEMENTS Employees of the Company, 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 Company may make discretionary matching or profit sharing contributions to the 401(k) Plan on behalf of eligible participants in any plan year. The Company did not make any contributions to the 401(k) Plan in the nine months ended September 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 Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company. 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 Company. Total expense recognized by the Company for the 401(k) Plan for the three months ended September 30, 2015 and 2014 was zero and $ 24,000 , respectively , and zero and $ 77,000 for the nine months ended September 30, 2015 and 2014, respectively . On September 12, 2012, the Board of Directors of the Company 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 Company was to make annual contributions of stock units (“Stock Units”) representing shares of the Company’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 s eparation from service to the Company 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 Company of its former president and chief executive officer 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 September 30, 2015 and 2014 was zero and $ 47,000 , respectively , and zero and $ 1.3 million for the nine months ended September 30, 2015 and 2014, respectively.

Disclosure Of Fair Value Of Ass

Disclosure Of Fair Value Of Assets And Liabilities	9 Months Ended
	Sep. 30, 2015
Disclosure Of Fair Value Of Assets And Liabilities [Abstract]
Disclosure Of Fair Value Of Financial Instruments	1 1 . DISCLOSURE OF FAIR VALUE OF ASSETS AND LIABILITIES 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 assets and liabilities at September 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 September 30, 2015 and December 31, 2014 . The fair value of the Company’s long-term debt, consisting of senior unsecured notes , an unsecured revolving credit facility and mortgages, loans payable and other obligations aggregated approximately $ 2,067,463,000 and $ 2,133,214,000 as compared to the book value of approximately $ 2,043,592,000 and $ 2,088,654,000 as of September 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. The fair value measurements used in the evaluation of the Company’s rental properties are considered to be Level 3 valuations within the fair value hierarchy, as there are significant unobservable inputs. Examples of inputs that were utilized in the fair value calculations include estimated holding periods, discount rates, market capitalization rates, expected lease rental rates, and third party broker information. The valuation techniques and significant unobservable inputs used for the Company’s Level 3 fair value measurements at September 30, 2015 were as follows: Fair Value at Primary September 30, Valuation Unobservable Location Range of Description 2015 Techniques Inputs Type Rates Properties held and used on which the Company recognized impairment losses $ Discounted cash flows Discount rate Suburban 8% - 15% Central Business District 6% - 8% Exit Capitalization rate Suburban 7.5% - 9% Central Business District 4.6% - 5.75% Disclosure about fair value of assets and liabilities is based on pertinent information available to management as of September 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 September 30, 2015 and current estimates of fair value may differ significantly fro m the amounts presented herein.

Commitments And Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments And Contingencies [Abstract]
Commitments And Contingencies	1 2 . 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 September 30, 2015 and 2014, respectively , and $742,000 and $742,000 for the nine months ended September 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 September 30, 2015 and 2014 , respectively , and $ 2.6 million and $2.6 million for the nine months ended September 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 September 30, 2015 , are as follows: (dollars in thousands) Year Amount October 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 September 30, 2015 and 2014 amounted to $ 102,000 and $ 102,000 , respectively , and $305,000 and $305,000 for the nine months ended September 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 charges and benefits related to changes 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 a s of September 30, 2015 was $1.2 million . Related to changes in the fair value of the Earn Out liability, the Company recognized a net charge of $219,000 during the three and nine months ended September 30, 2015, and recognized benefits of zero and $380,000 during the three and nine months ended September 30, 2014, respectively. Prospectively, the Earn Out liability will be remeasured at fair value 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 w ould step down as p resident and c hief e xecutive o fficer of the Company effective May 11, 2015 and w ou l d not stand for re-election to the Company’s Board of Directors (the “Board of Directors”) at the 2015 annual meeting of the Company’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 Company, the Company and Mr. Hersh entered into a Separation and General Release Agreement (the “Separation Agreement”) dated November 4, 2014 (the “Effective Date”). The Separation Agreement provide d that Mr. Hersh’s employment with the Company wa s being terminated without cause, and further provide d , 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 Company’s common stock that we re 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 Company (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 S eparation Agreement, Mr. Hersh continue d to receive his base salary in accordance with his employment agreement and to be eligible to participate in the Company’s executive incentive compensation and bonus programs. In addition, upon departure Mr. Hersh w as 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 Company’s former president and c hief e xecutive o fficer and of the departure of certain of the Company’s executive officers of approximately $23.8 million during the year ended December 31, 2014, of which approximately $11 million was recognized during the nine months ended September 30, 2014 and was included in general and administrative expense (approximately $11.5 million and $11.6 million was included in accounts payable, accrued expenses and other liabilities as of September 30, 2015 and December 31, 2014, respectively). OTHER The Company may not dispose of or distribute certain of its properties, currently comprised of seven properties with an aggregate net carrying value of approximately $ 57.3 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 Company’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 Company’s Board of Directors; David S. Mack, director; Earle I. Mack, a former director; and Mitchell E. Hersh, former president, chief executive officer and director), the Robert Martin Group (which includes Robert F. Weinberg, a former director and current member of its Advisory Board), and the Cali Group (which includes John R. Cali, a former director 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. 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 project is expect ed to cost approximately $ 28.7 million to complete (of which , as of September 30, 2015, the Company has incurred $ 13.9 million of the development costs, and estimates it will need to fund an additional $14.8 million for the completion of the project) . 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 $22.7 million have been incurred through September 30, 2015 ). The venture has a $28.8 million construction loan (with $6.6 million outstanding as of September 30, 2015 ). The Company expects to fund costs of approximately $20.9 million for the development of the project (of which, as of September 30, 2015, the Company has incurred $13.5 million of the development costs and estimates it will need to fund an additional $7.4 million for the completion of the project). On April 1, 2015, the Company acquired vacant land to accommodate a two-phase development of 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 September 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 first phase with 237 units started construction in the third quarter 2015 with anticipated initial deliveries in the second quarter 2017. The second phase, with 128 units, is projected to begin construction in 2017. T otal development costs are estimated to be approximately $92.5 million (of which $7.1 million was incurred by the Company through September 30, 2015 and estimates it will need to fund an additional $85.4 million for the completion of the project). On October 6, 2015, the Company entered into a joint venture partnership with XS Port Imperial Hotel, LLC (“XS”) to form XS Hotel Urban Renewal Associates LLC (“XS Hotel URA”) for the development and ownership of a 364 -key dual branded hotel property located in Weehawken, New Jersey (“Port Imperial Hotel”). Concurrently, the Company and XS entered into a separate joint venture partnership to form XS Hotel Associates, L.L.C. (“XS Hotel”) for the management and operations of the completed hotel development. The Company holds a 90 percent interest and XS holds the remaining 10 percent interest in the consolidated joint ventures, XS Hotel URA and XS Hotel, with the Company having full and complete authority, power, and discretion to manage and control the ventures’ business, affairs, and property. The construction of the Port Imperial Hotel is estimated to cost a total of $129.6 million, which will be funded by a $94 million construction loan with the balance to be funded with members’ capital. Upon closing, Mack-Cali’s initial contribution was $27.3 million, which included a capital credit of $23.7 million for its contributed Hotel Condominium Land unit, and XS Hotel’s initial contribution was $3 million. The Company expects to fund additional costs of approximately $4.8 million. The Company owns developable land to accommodate a multi-phase development project of approximately 1,034 -unit multi-family rental property located in Malden, Massachusetts. The initial phase commenced construction of 292 units in the third quarter of 2015 (the “Chase II Project”). The Chase II project is estimated to cost a total of $74.4 million (of which the Company has incurred $12.4 million through September 30, 2015) and is expected to be ready for occupancy by second quarter of 2017. The Company estimates it will need to fund additional costs of $62 million for the completion of the Chase II P roject.

Tenant Leases

Tenant Leases	9 Months Ended
	Sep. 30, 2015
Tenant Leases [Abstract]
Tenant Leases	1 3 . 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 September 30, 2015 are as follows (dollars in thousands) : Year Amount October 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.

Mack-Cali Realty Corporation St

Mack-Cali Realty Corporation Stockholders' Equity	9 Months Ended
	Sep. 30, 2015
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Mack-Cali Realty Corporation Stockholders' Equity	1 4 . MACK-CALI REALTY CORPORATION STOCKHOLDERS’ EQUITY To maintain its qualification as a REIT, not more than 50 percent in value of the outstanding shares of the Company may be owned, directly or indirectly, by five or fewer individuals at any time during the last half of any taxable year of the Company, other than its initial taxable year (defined to include certain entities), applying certain constructive ownership rules. To help ensure that the Company will not fail this test, the Company’s Charter provides, among other things, certain restrictions on the transfer of common stock to prevent further concentration of stock ownership. Moreover, to evidence compliance with these requirements, the Company must maintain records that disclose the actual ownership of its outstanding common stock and demands written statements each year from the holders of record of designated percentages of its common stock requesting the disclosure of the beneficial owners of such common stock. SHARE REPURCHASE PROGRAM In September 2012 , the Board of Directors renewed and authorized an increase to the Company’s repurchase program (“Repurchase Program”). The Company 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 Company 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. DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN The Company has a Dividend Reinvestment and Stock Purchase Plan (the “DRIP”) which commenced in March 1999 under which approximately 5.5 million shares of the Company’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 Company’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 Company waives this limit, for additional amounts subject to certain restrictions and other conditions set forth in the DRIP prospectus filed as part of the Company’s effective registration statement on Form S-3 filed with the SEC for the approximately 5.5 million shares of the Company’s common stock reserved for issuance under the DRIP. STOCK OPTION PLANS In May 2013, the Company 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 Company 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 Company 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 Company 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 Company’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 September 30, 2015 and December 31, 2014 , the stock options outstanding had a weighted average remaining contractual life of approximately 9.7 and 4.9 years, respectively. On June 5, 2015, in connection with the Executive Employment Agreements, the Company granted options to purchase a total of 800,000 shares of the Company’s common stock, exercisable for a period of ten years with an exercise price equal to the closing price of the Company’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 Company’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 Company’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 Lapsed or Cancelled Outstanding at September 30, 2015 ($17.31 – $21.25) $ $ Options exercisable at September 30, 2015 - Available for grant at September 30, 2015 The weighted average fair value of options granted during the nine months ended September 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 nine months ended September 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 nine months ended September 30, 2015 and 2014, respectively. The Company has a policy of issuing new shares to satisfy stock option exercises. The Company recognized stock options expense of $ 185,000 and $ 1,000 for the three months ended September 30, 2015 and 2014 , respectively , and $248,000 and $3,000 for the nine months ended September 30, 2015 and 2014, respectively . RESTRICTED STOCK AWARDS The Company has issued stock awards (“Restricted Stock Awards”) to officers, certain other employees, and non-employee members of the Board of Directors of the Company, which allow the holders to each receive a certain amount of shares of the Company’s common stock generally over a one to seven -year vesting period, of which 99 ,006 unvested shares were legally outstanding at September 30, 2015 . Of the Restricted Stock Awards issued to executive officers and certain other employees , 210,000 were contingent upon the Company meeting certain performance goals to be set by the Committee each year (“Performance Shares”), with the remaining based on time and service. On September 12, 2012, the Company 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 Company 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 Company’s former p resident and c hief e xecutive o fficer effective June 30 , 2015, the Company 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 12: Commitments and Contingencies – Departure of Executive Officer. On June 5, 2015, in connection with the Executive Employment Agreements, the Company 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 , certain other employees , and members of the Board of Directors of the Company 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 September 30, 2015 $ As of September 30, 2015 , the Company had $2.5 million of total unrecognized compensation cost related to unvested Restricted Stock Awards granted under the Company’s stock compensation plans. That cost is expected to be recognized over a weighted average period of 1.9 years. PERFORMANCE SHARE UNITS/ TSR-BASED AWARDS O n September 12, 2012, the Board of Directors of the Company 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 Company’s common stock upon vesting. In accordance with the amended and restated TSR-Based Awards agreements entered into between the Company 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 Company 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 Company agreed to vest 357 TSR Performance Shares and to grant and accelerate the vesting of 528 TSR Performance Shares, for which the Company issued 45,062 shares of Common Stock on April 2, 2014. In connection with the departure of the Company’s former p resident and c hief e xecutive o fficer effective June 30 , 2015, the Company agreed to vest 675 TSR Performance Shares on the Separation Date, for wh ich i t issue d 41,811 shares of common stock. See Note 1 2 : Commitments and Contingencies – Departure of Executive Officer. On June 5, 2015, in connection with the Executive Employment Agreements, the Company 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 Company’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 Company’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 Company 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 PSUs. 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 Company 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 Company, as defined in the plan. Deferred stock units are credited to each director quarterly using the closing price of the Company’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 nine months ended September 30, 2015 and 2014 , 15,279 and 15,230 deferred stock units were earned, respectively. As of September 30, 2015 and December 31, 2014 , there were 173,025 and 157,730 deferred stock units outstanding, respectively. EARNINGS PER SHARE Basic EPS excludes dilution and is computed by dividing net income available to common shareholders by the weighted average number of shares outstanding for the period. Diluted EPS 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 nine months ended September 30, 2015 and 2014 in accordance with ASC 260, Earning s Per Share: (dollars in thousands, except per share amounts) Three Months Ended Nine Months Ended September 30, September 30, Computation of Basic EPS Net income (loss) $ $ $ $ Add: Noncontrolling interest in consolidated joint ventures Add: Noncontrolling interest in Operating Partnership Net income (loss) available to common shareholders $ $ $ $ Weighted average common shares Basic EPS : Net income (loss) available to common shareholders $ $ $ $ Three Months Ended Nine Months Ended September 30, September 30, Computation of Diluted EPS Net income (loss) available to common shareholders $ $ $ $ Add (deduct): Noncontrolling interest in Operating Partnership Net income (loss) for diluted earnings per share $ $ $ $ Weighted average common shares Diluted EPS : Net income (loss) available to common shareholders $ $ $ $ The following schedule reconciles the shares used in the basic EPS calculation to the shares used in the diluted EPS calculation: (in thousands) Three Months Ended Nine Months Ended September 30, September 30, Basic EPS shares Add: Operating Partnership – common units Restricted Stock Awards - - Diluted EPS Shares 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 September 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 September 3 0 , 2014. Not included in the computations of diluted EPS were 405,000 and 10,000 stock options as such securities were anti-dilutive during the periods ended September 30, 2015 and 2014, respectively. Unvested restricted stock outstanding as of September 30, 2015 and 2014 were 99,006 and 304,816 shares, respectively. Dividends declared per common share for each of the three month periods ended September 30, 2015 and 2014 was $0.15 per share. Dividends declared per common share for the nine month periods ended September 30, 2015 and 2014 was $0.45 and $0.60 per share, respectively.

Noncontrolling Interests In Sub

Noncontrolling Interests In Subsidiaries	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interests In Subsidiaries [Abstract]
Noncontrolling Interests In Subsidiaries	1 5 . NONCONTROLLING INTERESTS IN SUBSIDIARIES Noncontrolling interests in subsidiaries in the accompanying consolidated financial statements relate to (i) common units in the Operating Partnership, held by parties other than the Company, and (ii) interests in consolidated joint ventures for the portion of such ventures not owned by the Company. OPERATING PARTNERSHIP Common Units Certain individuals and entities own common units in the Operating Partnership. A common unit and a share of Common Stock of the Company have substantially the same economic characteristics in as much as they effectively share equally in the net income or loss of the Operating Partnership. Common unitholders have the right to redeem their common units, subject to certain restrictions. The redemption is required to be satisfied in shares of Common Stock, cash, or a combination thereof, calculated as follows: one share of the Company’s Common Stock, or cash equal to the fair market value of a share of the Company’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, cash, or any combination thereof). If the Company elects to satisfy the redemption with shares of Common Stock as opposed to cash, it 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 Operating Partnership under any circumstances. When a unitholder redeems a common unit, noncontrolling interest in the Operating Partnership is reduced and Mack-Cali Realty Corporation Stockholders’ equity is increased. Unit Transactions The following table sets forth the changes in noncontrolling interests in subsidiaries which relate to the common units in the Operating Partnership for the nine months ended September 30, 2015 : Common Units Balance at January 1, 2015 Redemption of common units for shares of common stock Balance at September 30, 2015 The following table reflects the activity of noncontrolling interests for the nine months ended September 30, 2015 and 2014 , respectively (dollars in thousands): Nine Months Ended September 30, Balance at January 1 $ $ Net income (loss) Common unit distributions Increase in noncontrolling interests in consolidated joint ventures Redemption of common units for common stock Rebalancing of ownership percentage between parent and subsidiaries Balance at September 30 $ $ Pursuant to ASC 810, Consolidation, on the accounting and reporting for noncontrolling interests and changes in ownership interests of a subsidiary , changes in a parent’s ownership interest (and transactions with noncontrolling interest unitholders in the subsidiary) while the parent retains its controlling interest in its subsidiary should be accounted for as equity transactions. The carrying value of the noncontrolling interest shall be adjusted to reflect the change in its ownership interest in the subsidiary, with the offset to equity attributable to the parent. Accordingly, as a result of equity transactions which caused changes in ownership percentages between Mack-Cali Realty Corporation stockholders’ equity and noncontrolling interests in the Operating Partnership that occurred during the nine months ended September 30, 2015 , the Company has increased noncontrolling interests in the Operating Partnership and decreased additional paid-in capital in Mack-Cali Realty Corporation stockholders’ equity by approximately $ 0.3 million as of September 30, 2015 . Noncontrolling Interest Ownership As of September 30, 2015 and December 31, 2014 , the noncontrolling interest common unitholders owned 10.8 percent and 11.1 percent of the Operating Partnership, respectively. 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. 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 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.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	1 6 . 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 nine months ended September 30, 2015 and 2014 . The Company had no long lived assets in foreign locations as of September 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 nine months ended September 30, 2015 and 2014 and selected asset information as of September 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: September 30, 2015 $ $ $ (e) $ $ September 30, 2014 (f) Nine months ended: September 30, 2015 (g) September 30, 2014 (h) Total operating and interest expenses (a): Three months ended: September 30, 2015 $ $ $ $ $ September 30, 2014 Nine months ended: September 30, 2015 September 30, 2014 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: September 30, 2015 $ $ $ $ - $ September 30, 2014 - Nine months ended: September 30, 2015 - September 30, 2014 - Net operating income (loss) (b): Three months ended: September 30, 2015 $ $ $ $ $ September 30, 2014 Nine months ended: September 30, 2015 September 30, 2014 Total assets: September 30, 2015 $ $ $ $ $ December 31, 2014 Total long-lived assets (c): September 30, 2015 $ $ $ $ $ December 31, 2014 Total investments in unconsolidated joint ventures: September 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. The Company recorded an impairment charge of $164.2 million on assets included in the commercial and other real estate business segment for the three and nine months ended September 30, 2015. See Note 3: Recent Transactions – Impairments on Properties Held and Used. (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 $ 1,621 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (f) Includes $ 1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (g) Includes $4,452 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (h) Includes $2,962 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 shareholders: (dollars in thousands) Three Months Ended Nine Months Ended September 30, September 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 - - - Impairments - - Net income (loss) Noncontrolling interest in consolidated joint ventures Noncontrolling interest in Operating Partnership Net income (loss) available to common shareholders $ $ $ $

Significant Accounting Polici23

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 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 $ 0.9 million and $ 1.0 million for the three months ended September 30, 2015 and 2014 , respectively, and $3.5 million and $ 2.7 million for the nine months ended September 30, 2015 and 2014, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $ 103.1 million and $ 62.8 million as of September 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 value 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. See Note 3: Recent Transactions – Impairments on Properties Held and Used.
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 value 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 value 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 $ 945,000 and $ 778,000 for the three months ended September 30, 2015 and 2014 , respectively, and $2,846,000 and $2,306,000 for the nine months ended September 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 es ) from early extinguishment of debt. No such unamortized costs were written off for the nine months ended September 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 Company are compensated for providing leasing services to the Properties. The portion of such compensation related to commercial leases, which is capitalized and amortized, was approximate ly $ 922,000 and $ 940,000 for the three months ended September 30, 2015 and 2014 , respectively, and approximately $2,738,000 and $2,816,000 for the nine months ended September 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 value 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 value . If , based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying value , then performing the additional two-step impairment test is unnecessary. If the carrying value 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 13: 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 has elected to be taxed as a REIT under Sections 856 through 860 of the Internal Revenue Code of 1986, as amended (the “Code”). As a REIT, the Company generally will not be subject to corporate federal income tax (including alternative minimum tax) on net income that it currently distributes to its shareholders, provided that the Company satisfies certain organizational and operational requirements including the requirement to distribute at least 90 percent of its REIT taxable income (determined by excluding any net capital gains) to its shareholders. If and to the extent the Company retains and does not distribute any net capital gains, the Company will be required to pay federal, state and local taxes on such net capital gains at the rate applicable to capital gains of a corporation. The Company has elected to treat certain of its corporate subsidiaries as taxable REIT subsidiaries (each a “TRS”). In general, a TRS of the Company 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 September 30, 2015 , the Company had a deferred tax asset related to its TRS activity with a balance of approximately $ 16.0 million which has been fully reserved for through a valuation allowance. If the Company fails to qualify as a REIT in any taxable year, the Company will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates. The Company 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 September 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 Share	Earnings Per Share The Company presents both basic and diluted earnings per share (“EPS”). Basic EPS excludes dilution and is computed by dividing net income available to common shareholders by the weighted average number of shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock, where such exercise or conversion would result in a lower EPS from continuing operations amount. Shares whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPS as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those shares 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 shares included in diluted EPS shall be based on the number of shares, 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 shares that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable shares shall be included in the denominator of diluted EPS as of the beginning of the period (or as of the date of the grant, if later).
Dividends And Distributions Payable	Dividends and Distributions Payable The dividends and distributions payable at September 30, 2015 represents dividends payable to common shareholders ( 89,310,308 shares) and distributions payable to noncontrolling interest common unitholders of the Operating Partnership ( 10,790,142 common units) for all such holders of record as of October 5, 2015 with respect to the third quarter 2015 . The third quarter 2015 common stock dividends and common unit distributions of $ 0.15 per common share and unit were approved by the Board of Directors on September 22, 2015 and paid on October 15, 2015 . The dividends and distributions payable at December 31, 2014 represents dividends payable to common shareholders ( 88,866,652 shares) and distributions payable to noncontrolling interest common unitholders of the Operating Partnership ( 11,083,876 common units) for all such holders of record as of January 6, 2015 with respect to the fourth quarter 2014 . The fourth quarter 2014 common stock dividends and common unit distributions of $ 0.15 per common share and unit were approved by the 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 Company’s stock issuances are reflected as a reduction of additional paid ‑in 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 $ 695,000 and $ 830,000 for the three months ended September 30, 2015 and 2014 , respectively, and $1,500,000 and $5,094,000 for the nine months ended September 30, 2015 and 2014, respectively. The amount for the nine months ended September 30, 2014 included $ 3,150,000 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 nine months ended September 30, 2015 and 2014 , and no accumulated other comprehensive income as of September 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 that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this update. Debt issuance costs related to revolving lines of credit are not within the scope of this new guidance. Additionally, in August 2015 the FASB issued guidance expanding the April 2015 update (ASU 2015-15) . It states that, given the absence of authoritative guidance within the update, the SEC staff would not object to an entity deferring and presenting debt issuance costs as an asset for revolving lines of credit and subsequently amortizing the deferred debt issuance costs ratably over the term of the arrangement, regardless of whether there are any outstanding borrowings on the line of credit. This guidance is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years, with early adoption permitted for financial statements that have not been previously issued. Full retrospective application is required. 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)	9 Months Ended
	Sep. 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)	9 Months Ended
	Sep. 30, 2015
Recent Transactions [Abstract]
Summary Of Income From Properties Disposed	Three Months Ended Nine Months Ended September 30, September 30, Total revenues $ $ $ $ Operating and other expenses Depreciation and amortization Interest expense Income (loss) from properties disposed of $ $ $ $ Realized gains on dispositions Total income from properties disposed of $ $ $ $

Investments In Unconsolidated26

Investments In Unconsolidated Joint Ventures (Tables)	9 Months Ended
	Sep. 30, 2015
Investments In Unconsolidated Joint Ventures [Abstract]
Summary Of Unconsolidated Joint Ventures	Property Debt Number of Company's Carrying Value As of September 30, 2015 Apartment Units Effective September 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 % 08/01/25 % (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 September 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) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $6,489 , bears interest at 3.63 percent, matures in August 2018 ; 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 2016 . 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 with a maximum borrowing amount of $23,400 converted to a permanent loan on July 14, 2015 . See discussion in Recent Transactions following in this footnote. (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 $0.5 million to be drawn at September 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. See discussion in Recent Transactions following in this footnote. (v) Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023 ; principal balance of $85,521 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 $4.4 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 $41,849 bears interest at 4.95 percent and matures on July 1, 2017 ; principal balance of $72,329 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 value for this venture of $1,419 and $1,854 as of September 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 $60,498 , bears interest at 6.15 percent and matures in November 2016 , and (ii) loan with a balance of $3,594 , bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020 . The Company posted a $3.6 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 Nine Months Ended September 30, September 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	September 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 Results Of Operations Of Unconsolidated Joint Ventures	Three Months Ended Nine Months Ended September 30, September 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)	9 Months Ended
	Sep. 30, 2015
Deferred Charges, Goodwill And Other Assets, Net [Abstract]
Schedule Of Deferred Charges, Goodwill And Other Assets	September 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 September 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 $ 3.1 million and matures in April 2023 . The Company believes these balances are fully collectible.
Summary Of Notional And Fair Value Of Derivative Financial Instruments	Fair Value Notional Strike Effective Expiration September 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)	9 Months Ended
	Sep. 30, 2015
Restricted Cash [Abstract]
Schedule Of Restricted Cash	September 30, December 31, Security deposits $ $ Escrow and other reserve funds Total restricted cash $ $

Senior Unsecured Notes (Tables)

Senior Unsecured Notes (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary Of Senior Unsecured Notes	September 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)	9 Months Ended
	Sep. 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)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary Of Mortgages, Loans Payable And Other Obligations	Effective September 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 % - - 10 Independence (c) Wells Fargo CMBS % - - 4 Sylvan (d) Wells Fargo CMBS % - - 210 Clay (e) Wells Fargo CMBS % - - 5 Becker (f) Wells Fargo CMBS % - - 6 Becker, 85 Livingston, Wells Fargo CMBS % $ 08/11/14 (h) 75 Livingston & 20 Waterview (g) 9200 Edmonston Road Principal Commercial Funding L.L.C. % 05/01/15 (i) Port Imperial South Wells Fargo Bank N.A. LIBOR+1.75 % 11/18/15 4 Becker 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 May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (d) On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (e) On July 21, 2015, the Company transferred the deed for 210 Clay to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (f) On August 24, 2015, the Company transferred the deed for 5 Becker to the lender in satisfaction of its obligation. See Note 3: Recent Transactions. (g) Mortgage is cross collateralized by the four properties. (h) The loan was not repaid at maturity and the Company is in discussions with the lender regarding potential options in satisfaction of the obligation. (i) 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 at maturity on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan. (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 3.501 percent at September 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 9.707 percent at September 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.

Disclosure Of Fair Value Of A32

Disclosure Of Fair Value Of Assets And Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Disclosure Of Fair Value Of Assets And Liabilities [Abstract]
Schedule Of Valuation Techniques And Significant Unobservable Inputs	Fair Value at Primary September 30, Valuation Unobservable Location Range of Description 2015 Techniques Inputs Type Rates Properties held and used on which the Company recognized impairment losses $ Discounted cash flows Discount rate Suburban 8% - 15% Central Business District 6% - 8% Exit Capitalization rate Suburban 7.5% - 9% Central Business District 4.6% - 5.75%

Commitments And Contingencies (

Commitments And Contingencies (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments And Contingencies [Abstract]
Future Minimum Rental Payments Of Ground Leases	Year Amount October 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 through 2084 Total $

Tenant Leases (Tables)

Tenant Leases (Tables)	9 Months Ended
	Sep. 30, 2015
Tenant Leases [Abstract]
Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases	Year Amount October 1 through December 31, 2015 $ 2016 2017 2018 2019 2020 and thereafter Total $

Mack-Cali Realty Corporation 35

Mack-Cali Realty Corporation Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2015
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Schedule Of Stock Option Plans	Weighted Aggregate Average Intrinsic Shares Exercise Value Under Options Price $(000’s) Outstanding at January 1, 2015 $ - Granted Lapsed or Cancelled Outstanding at September 30, 2015 ($17.31 – $21.25) $ $ Options exercisable at September 30, 2015 - Available for grant at September 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 September 30, 2015 $
Schedule Of Basic And Diluted Earnings Per Share	Three Months Ended Nine Months Ended September 30, September 30, Computation of Basic EPS Net income (loss) $ $ $ $ Add: Noncontrolling interest in consolidated joint ventures Add: Noncontrolling interest in Operating Partnership Net income (loss) available to common shareholders $ $ $ $ Weighted average common shares Basic EPS : Net income (loss) available to common shareholders $ $ $ $ Three Months Ended Nine Months Ended September 30, September 30, Computation of Diluted EPS Net income (loss) available to common shareholders $ $ $ $ Add (deduct): Noncontrolling interest in Operating Partnership Net income (loss) for diluted earnings per share $ $ $ $ Weighted average common shares Diluted EPS : Net income (loss) available to common shareholders $ $ $ $ The following schedule reconciles the shares used in the basic EPS calculation to the shares used in the diluted EPS calculation: (in thousands) Three Months Ended Nine Months Ended September 30, September 30, Basic EPS shares Add: Operating Partnership – common units Restricted Stock Awards - - Diluted EPS Shares

Noncontrolling Interests In S36

Noncontrolling Interests In Subsidiaries (Tables)	9 Months Ended
	Sep. 30, 2015
Noncontrolling Interests In Subsidiaries [Abstract]
Changes In Noncontrolling Interests Of Subsidiaries	Common Units Balance at January 1, 2015 Redemption of common units for shares of common stock Balance at September 30, 2015
Schedule Of Activity Of Noncontrolling Interests	Nine Months Ended September 30, Balance at January 1 $ $ Net income (loss) Common unit distributions Increase in noncontrolling interests in consolidated joint ventures Redemption of common units for common stock Rebalancing of ownership percentage between parent and subsidiaries Balance at September 30 $ $

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 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: September 30, 2015 $ $ $ (e) $ $ September 30, 2014 (f) Nine months ended: September 30, 2015 (g) September 30, 2014 (h) Total operating and interest expenses (a): Three months ended: September 30, 2015 $ $ $ $ $ September 30, 2014 Nine months ended: September 30, 2015 September 30, 2014 Equity in earnings (loss) of unconsolidated joint ventures: Three months ended: September 30, 2015 $ $ $ $ - $ September 30, 2014 - Nine months ended: September 30, 2015 - September 30, 2014 - Net operating income (loss) (b): Three months ended: September 30, 2015 $ $ $ $ $ September 30, 2014 Nine months ended: September 30, 2015 September 30, 2014 Total assets: September 30, 2015 $ $ $ $ $ December 31, 2014 Total long-lived assets (c): September 30, 2015 $ $ $ $ $ December 31, 2014 Total investments in unconsolidated joint ventures: September 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. The Company recorded an impairment charge of $164.2 million on assets included in the commercial and other real estate business segment for the three and nine months ended September 30, 2015. See Note 3: Recent Transactions – Impairments on Properties Held and Used. (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 $ 1,621 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (f) Includes $ 1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (g) Includes $4,452 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation. (h) Includes $2,962 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 shareholders: (dollars in thousands) Three Months Ended Nine Months Ended September 30, September 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 - - - Impairments - - Net income (loss) Noncontrolling interest in consolidated joint ventures Noncontrolling interest in Operating Partnership Net income (loss) available to common shareholders $ $ $ $

Organization And Basis Of Pre38

Organization And Basis Of Presentation (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)ft²statepropertyitem	Dec. 31, 2014USD ($)
Real Estate Properties [Line Items]
Number of properties owned or investment interests	274
Aggregate square feet of the property owned or investment interest | ft²	29,700,000
Number of states where properties are located | state	7
Consolidated joint ventures, total real estate assets | $	$ 254	$ 242.9
Consolidated joint ventures, mortgages | $	100.7	94.3
Consolidated joint ventures, other liabilities | $	$ 17.5	$ 15.7
Commercial Properties [Member]
Real Estate Properties [Line Items]
Number of tenants | item	1,900
Multi-Family Properties [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	19
Number of units | item	5,644
Office [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	146
Aggregate square feet of the property owned or investment interest | ft²	24,400,000
Office Flex Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	109
Aggregate square feet of the property owned or investment interest | ft²	4,800,000
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
Unconsolidated Joint Venture Office/Flex Buildings [Member]
Real Estate Properties [Line Items]
Number of properties owned or investment interests	94
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
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 Polici39

Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Oct. 05, 2015	Jan. 06, 2015
Significant Accounting Policies [Line Items]
Capitalized development and construction salaries and other related costs	$ 900,000		$ 1,000,000	$ 3,500,000	$ 2,700,000
Construction, tenant improvement, and development in-progress	103,100,000	$ 62,800,000		$ 103,100,000		$ 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	945,000		778,000	2,846,000	2,306,000
Write off of unamortized deferred financing costs				0	0
Deferred leasing costs	922,000		$ 940,000	2,738,000	2,816,000
Deferred tax asset	$ 16,000,000			16,000,000
Income taxes, material adjustment amount				$ 0
Common stock, shares outstanding	89,310,243	89,076,578		89,310,243		89,076,578		88,866,652
Common units outstanding	10,790,142	11,083,876		10,790,142		11,083,876		11,083,876
Distributions payable, record date				Oct. 5, 2015		Jan. 6, 2015
Distributions payable, approved date	Sep. 22, 2015		Dec. 9, 2014
Common stock dividends and common unit distributions per share	$ 0.15	$ 0.15
Restricted stock expense	$ 695,000		$ 830,000	$ 1,500,000	5,094,000
Distributions payable, pay date	Oct. 15, 2015		Jan. 14, 2015
Difference between other comprehensive income and net income	$ 0		$ 0	0	0
Accumulated other comprehensive income	$ 0	$ 0		$ 0		$ 0
Executive Officer [Member]
Significant Accounting Policies [Line Items]
Restricted stock expense					$ 3,150,000
Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Common stock, shares outstanding							89,310,308
Common units outstanding							10,790,142

Significant Accounting Polici40

Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	9 Months Ended
	Sep. 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 (Acquisitio

Recent Transactions (Acquisitions) (Narrative) (Details)	Oct. 23, 2015USD ($)ft²	Apr. 01, 2015USD ($)item	Oct. 31, 2015	Sep. 30, 2015USD ($)item	Sep. 30, 2015USD ($)item	Sep. 30, 2015USD ($)item	Sep. 30, 2014USD ($)	Dec. 31, 2017item
Real Estate Properties [Line Items]
Purchase price of property						$ 59,700,000	$ 77,109,000
Subsequent Event [Member]
Real Estate Properties [Line Items]
Acquisition expected completion date			fourth quarter of 2015
City Square Project [Member]
Real Estate Properties [Line Items]
Number of units | item		365
Purchase price of property		$ 3,100,000
Contingent consideration		$ 1,250,000
Total project costs				$ 92,500,000		92,500,000
Costs of the project incurred					$ 7,100,000	7,100,000
Transaction costs				$ 111,000	$ 111,000	$ 111,000
City Square Project Phase One [Member]
Real Estate Properties [Line Items]
Number of units | item				237	237	237
City Square Project Phase Two [Member] | Scenario, Forecast [Member]
Real Estate Properties [Line Items]
Number of units | item								128
Edison [Member] | Subsequent Event [Member]
Real Estate Properties [Line Items]
Area of property (in square feet) | ft²	196,000
Purchase price of property	$ 53,100,000

Recent Transactions (Dispositio

Recent Transactions (Dispositions) (Narrative) (Details) $ in Thousands	Jun. 26, 2015USD ($)ft²	Jun. 01, 2015USD ($)item	Jan. 15, 2015USD ($)ft²	Sep. 30, 2015USD ($)ft²property	Jun. 30, 2015USD ($)ft²property	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)ft²	Sep. 30, 2014USD ($)	Dec. 31, 2014property	Dec. 31, 2013USD ($)	Apr. 01, 2015item
Real Estate Properties [Line Items]
Sales proceeds	$ 80,000						$ 81,049	$ 274,839
Mortgage loan				$ 1,784,744			1,784,744
Impairment charge				164,176			164,176
Realized gains on dispositions, net				$ 18,718		$ 264	$ 53,261	$ 54,848
Number of properties sold | property									16
City Square Project [Member]
Real Estate Properties [Line Items]
Number of units | item											365
1451 Metropolitan Drive [Member]
Real Estate Properties [Line Items]
Sales proceeds			$ 1,100
Realized gains on dispositions, net			$ 100
Area of property sold (in square feet) | ft²			21,600
14 Sylvan Way [Member]
Real Estate Properties [Line Items]
Realized gains on dispositions, net	$ 24,700
Area of property sold (in square feet) | ft²	203,506
4 Sylvan Way [Member]
Real Estate Properties [Line Items]
Area Of Real Estate Property | ft²					105,135
Mortgage loan					$ 14,600
Mortgage loan, maturity date				Aug. 11, 2014
10 Independence [Member]
Real Estate Properties [Line Items]
Area Of Real Estate Property | ft²					120,528
Mortgage loan					$ 16,900
Mortgage loan, maturity date				Aug. 11, 2014
4 Sylvan Way And 10 Independence [Member]
Real Estate Properties [Line Items]
Number of properties transferred | property					2
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 gains on dispositions, net		$ 6,400
5 Becker And 210 Clay [Member]
Real Estate Properties [Line Items]
Number of properties transferred | property				2
5 Becker [Member]
Real Estate Properties [Line Items]
Area Of Real Estate Property | ft²				118,343			118,343
Mortgage loan				$ 14,400			$ 14,400
Mortgage loan, maturity date				May 11, 2016
210 Clay [Member]
Real Estate Properties [Line Items]
Area Of Real Estate Property | ft²				121,203			121,203
Mortgage loan				$ 13,800			$ 13,800
Mortgage loan, maturity date				May 11, 2016
4 Sylvan Way, 10 Independence, 5 Becker And 210 Clay [Member]
Real Estate Properties [Line Items]
Impairment charge										$ 25,200
Realized gains on dispositions, net				$ 18,700			$ 28,400

Recent Transactions (Appointmen

Recent Transactions (Appointment Of Executive Officers) (Narrative) (Details)	Jun. 05, 2015item$ / sharesshares	Sep. 12, 2012shares	Sep. 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
Three Equal Annual Installment [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	400,000
Common Stock Trades [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	400,000
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 percentage			50.00%
Annual bonus opportunity threshold amount | $			$ 350,000
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
Messr Rudin And Messr DeMarco [Member] | Three Equal Annual Installment [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	200,000
Messr Rudin And Messr DeMarco [Member] | Common Stock Trades [Member]
Appointment Of Executive Officers [Line Items]
Shares under options - Granted	200,000
Restricted Stock [Member]
Appointment Of Executive Officers [Line Items]
Shares granted		319,667
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
Performance 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
Stock compensation vesting 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] | 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] | 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] | Messr Rudin And Messr DeMarco [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] | Messr Rudin And Messr DeMarco [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%

Recent Transactions (Impairment

Recent Transactions (Impairments On Properties Held and Used) (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015USD ($)ft²property	Sep. 30, 2015USD ($)ft²property	Sep. 30, 2013USD ($)	Dec. 31, 2014USD ($)property
Real Estate Properties [Line Items]
Impairment charge	$ 164,176	$ 164,176
Mortgage loan	740,024	740,024		$ 820,910
Number of properties sold | property				16
Non-core Properties [Member]
Real Estate Properties [Line Items]
Impairment charge		158,600
Aggregate carrying value	554,300	$ 554,300
Number of impaired properties | property		22
Estimated fair value	395,700	$ 395,700
New Jersey [Member]
Real Estate Properties [Line Items]
Mortgage loan	$ 65,000	$ 65,000
Number of real estate properties | property	4	4
Roseland And Parsippany Properties [Member]
Real Estate Properties [Line Items]
Impairment charge		$ 5,600	$ 12,500
Number of impaired properties | property		3
Area Of Real Estate Property | ft²	479,877	479,877
New Jersey Hudson River [Member]
Real Estate Properties [Line Items]
Earn out period		3 years

Recent Transactions (Summary Of

Recent Transactions (Summary Of Income From Properties Disposed) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Real Estate Properties [Line Items]
Total revenues	$ 146,158	$ 155,489	$ 448,440	$ 485,385
Depreciation and amortization	(44,099)	(41,983)	(127,266)	(131,679)
Income from properties disposed of	(139,310)	29,534	(84,949)	72,258
Realized gains on dispositions	18,718	264	53,261	54,848
Total Income from properties disposed of	(126,892)	1,982	(94,034)	37,807
Impairments	(164,176)		(164,176)
Disposal Group, Not Discontinued Operations [Member]
Real Estate Properties [Line Items]
Total revenues	225	8,891	9,118	48,196
Operating and other expenses	(700)	(3,627)	(4,136)	(22,576)
Depreciation and amortization	(3,585)	(1,363)	(7,509)	(9,178)
Interest expense	(1,146)	(2,588)	(6,374)	(7,795)
Income from properties disposed of	(5,206)	1,313	(8,901)	8,647
Realized gains on dispositions	18,718	264	53,261	54,848
Total Income from properties disposed of	$ 13,512	$ 1,577	$ 44,360	$ 63,495

Investments In Unconsolidated46

Investments In Unconsolidated Joint Ventures (Narrative) (Details)		Jul. 14, 2015USD ($)item	Jun. 01, 2015USD ($)item	May. 13, 2015USD ($)item	Jan. 15, 2015USD ($)	Sep. 30, 2015USD ($)ft²propertyitem		Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)ft²propertyitem		Sep. 30, 2014USD ($)	Aug. 28, 2015USD ($)ft²	Aug. 27, 2015USD ($)	Jul. 15, 2015	Apr. 01, 2015item	Dec. 31, 2014USD ($)
Schedule of Equity Method Investments [Line Items]
Company's investments in unconsolidated joint ventures, net						$ 299,486,000			$ 299,486,000							$ 247,468,000
Amount outstanding						35,000,000			35,000,000
Management, leasing, development and other services fees						1,300,000		$ 1,900,000	4,400,000		$ 5,100,000
Accounts receivable due from unconsolidated joint ventures						700,000			700,000							1,000,000
Maximum exposure to loss						202,100,000			202,100,000
Estimated future funding commitments						33,700,000			33,700,000
Realized gains on dispositions, net						18,718,000		$ 264,000	53,261,000		54,848,000
Mortgage loan						$ 1,784,744,000			1,784,744,000
Proceeds from mortgages and loans payable									$ 6,193,000		$ 28,350,000
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						5,700,000			5,700,000
Unconsolidated Joint Venture Retail Buildings [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties | property						2			2
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 Hotel [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item						350			350
Unconsolidated Joint Venture Development Projects [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item						1,074			1,074
Unconsolidated Joint Venture Land Parcels [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item						2,910			2,910
Unconsolidated Joint Ventures [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity						$ 453,600,000			$ 453,600,000
Amount outstanding						268,300,000			268,300,000
Unconsolidated Joint Ventures [Member] | Parent Company [Member] | Guarantee of Indebtedness of Others [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity						62,000,000			62,000,000
Amount outstanding						$ 53,100,000			$ 53,100,000
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 investments in unconsolidated joint ventures, net						$ 168,400,000			$ 168,400,000
Number of VIEs | property						5			5
Office [Member] | Unconsolidated Joint Venture Land Parcels [Member]
Schedule of Equity Method Investments [Line Items]
Area of property (in square feet) | ft²						1,400,000			1,400,000
South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's investments in unconsolidated joint ventures, net	[1]
Number of units | item						350			350
Percentage of interest in venture	[2]					50.00%			50.00%
Letter of credit						$ 3,600,000			$ 3,600,000
Mortgage loan						$ 64,092,000			$ 64,092,000
Keystone-Penn [Member]
Schedule of Equity Method Investments [Line Items]
Area of property (in square feet) | ft²						1,842,820			1,842,820			236,417
Percentage of interest in venture	[2],[3]
Mortgage loan						$ 223,546,000			$ 223,546,000			$ 45,500,000	$ 31,800,000
Proceeds from mortgages and loans payable									3,700,000
RiverPark At Harrison I, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's investments in unconsolidated joint ventures, net						$ 2,575,000			$ 2,575,000							4,744,000
Number of units | item		141				141			141
Percentage of interest in venture		36.00%				45.00%	[2]		45.00%	[2]				45.00%
Proceeds from loans		$ 1,700,000
Mortgage loan		30,000,000				$ 30,000,000			$ 30,000,000
RiverPark At Harrison I, L.L.C. [Member] | Construction Loan [Member]
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity						$ 23,400,000			$ 23,400,000
Mortgage loan		$ 23,400,000
RiverPark At Harrison I, L.L.C. [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of interest in venture		44.00%
Percentage of additional interest acquired		20.00%
Third party ownership percentage														55.00%
Capital balance		$ 2,100,000
Rosewood Lafayette Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's investments in unconsolidated joint ventures, net	[4]															$ 62,000
Number of units | item			217			217	[4]		217	[4]
Percentage of interest in venture			25.00%			25.00%	[2],[4]		25.00%	[2],[4]
Realized gains on dispositions, net			$ 6,400,000
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
Distributed cash received from sale				0
Realized gains on dispositions, net				$ 0
City Square Project [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item															365
City Square Project Phase One [Member]
Schedule of Equity Method Investments [Line Items]
Number of units | item						237			237
1451 Metropolitan Drive [Member]
Schedule of Equity Method Investments [Line Items]
Realized gains on dispositions, net					$ 100,000
[1]	The negative carrying value for this venture of $1,419 and $1,854 as of September 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]	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. See discussion in Recent Transactions following in this footnote.
[4]	See discussion in Recent Transactions following in this footnote for disposition of Company's interest in the unconsolidated joint ventures.

Investments In Unconsolidated47

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) $ in Thousands

Jun. 26, 2015USD ($)

Sep. 02, 2013USD ($)

Jun. 30, 2013USD ($)

Sep. 30, 2015USD ($)ft²propertyitem

Sep. 30, 2014USD ($)

Aug. 28, 2015USD ($)ft²

Aug. 27, 2015USD ($)

Jul. 15, 2015

Jul. 14, 2015USD ($)item

Jun. 01, 2015item

May. 13, 2015item

Dec. 31, 2014USD ($)

Schedule of Equity Method Investments [Line Items]

Carrying Amount

$ 299,486

$ 247,468

Property Debt, Balance

1,784,744

Amount outstanding

35,000

Accounts payable, accrued expenses and other liabilities

136,673

126,971

Sales proceeds

$ 80,000

81,049

$ 274,839

Collection of notes receivable

$ 7,750

$ 10,250

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%

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]

$ 15,686

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]

$ 1,237

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]

$ 5,810

6,029

Property Debt, Balance

[4],[5]

$ 46,206

Property Debt, Interest Rate

[4],[5],[6]

Note payable

$ 975

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]

$ 2,261

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

[7]

2.50%

Notional amount

$ 52,000

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

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]

$ 274

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, L.L.C. [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, L.L.C. [Member] | Permanent 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]

$ 27,716

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]

1,747

Property Debt, Balance

[1]

$ 42,336

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

[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]

1,087

Property Debt, Balance

[1]

$ 69,916

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

[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

[1],[13]

363

Company's Effective Ownership %

[1],[2],[13]

20.00%

Carrying Amount

[1],[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

$ 15,946

11,282

Property Debt, Balance

$ 63,627

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

Extension fee

0.25%

Maximum borrowing capacity

$ 77,400

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

141

Company's Effective Ownership %

45.00%

[2]

45.00%

36.00%

Carrying Amount

$ 2,575

4,744

Property Debt, Balance

$ 30,000

$ 30,000

Property Debt, Maturity Date

Aug. 1, 2025

Property Debt, Interest Rate, LIBOR

[16]

3.70

Property Debt, Interest Rate, Spread Over LIBOR

[16]

3.70%

RiverPark At Harrison I, L.L.C. [Member] | Construction Loan [Member]

Schedule of Equity Method Investments [Line Items]

Property Debt, Balance

$ 23,400

Maximum borrowing capacity

$ 23,400

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

$ 47,156

49,327

Property Debt, Balance

$ 94,671

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

$ 95,978

34,954

Property Debt, Balance

$ 22,916

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

$ 1,325

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]

Square feet | ft²

92,878

Company's Effective Ownership %

[2]

50.00%

Carrying Amount

$ 4,073

3,963

Property Debt, Balance

$ 15,310

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]

Square feet | ft²

139,750

Company's Effective Ownership %

[2]

50.00%

Carrying Amount

$ 5,730

5,620

Property Debt, Balance

$ 12,912

Property Debt, Maturity Date

Jul. 1, 2023

Property Debt, Interest Rate

2.87%

BNES Associates III [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

106,345

Company's Effective Ownership %

[2]

31.25%

Carrying Amount

$ 2,126

1,993

Property Debt, Balance

$ 6,292

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]

Square feet | 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]

Square feet | ft²

339,615

Company's Effective Ownership %

[2]

33.33%

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

Amount outstanding

$ 500

Construction reserve

$ 25,000

Keystone-Penn [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

1,842,820

236,417

Company's Effective Ownership %

[2],[21]

Property Debt, Balance

$ 223,546

$ 45,500

$ 31,800

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

$ 85,521

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-Penn [Member] | Keystone Property Group [Member]

Schedule of Equity Method Investments [Line Items]

Internal rate of return

15.00%

Keystone-Penn [Member] | Parent Company [Member]

Schedule of Equity Method Investments [Line Items]

Internal rate of return

10.00%

Keystone-TriState [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

1,266,384

Company's Effective Ownership %

[2],[23]

Carrying Amount

$ 4,376

6,140

Property Debt, Balance

$ 206,878

Property Debt, Interest Rate

[24]

Capital balance in properties in which senior pari passu interest is held

$ 4,400

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

$ 41,849

Property Debt, Maturity Date

Jul. 1, 2017

Property Debt, Interest Rate

4.95%

Keystone-TriState [Member] | Principal Balance Due September 9, 2017 [Member]

Schedule of Equity Method Investments [Line Items]

Property Debt, Balance

$ 72,329

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 Entities [Member]

Schedule of Equity Method Investments [Line Items]

Internal rate of return

15.00%

KPG-MCG Curtis JV, LLC [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

[25]

885,000

Company's Effective Ownership %

[2],[25]

50.00%

Carrying Amount

[25]

$ 56,441

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]

Square feet | ft²

1,225,000

Company's Effective Ownership %

[2]

50.00%

Carrying Amount

$ 3,969

4,022

Roseland/North Retail, L.L.C. [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

[1]

30,745

Company's Effective Ownership %

[1],[2]

20.00%

Carrying Amount

[1]

$ 1,776

1,828

South Pier At Harborside [Member]

Schedule of Equity Method Investments [Line Items]

Number of Apartment Units | item

350

Company's Effective Ownership %

[2]

50.00%

Carrying Amount

[27]

Property Debt, Balance

$ 64,092

Property Debt, Interest Rate

[28]

Accounts payable, accrued expenses and other liabilities

$ 1,419

1,854

Letter of credit

3,600

South Pier At Harborside [Member] | 6.15% Mortgage Loan Due November 2016 [Member]

Schedule of Equity Method Investments [Line Items]

Property Debt, Balance

$ 60,498

Property Debt, Maturity Date

Nov. 1, 2016

Property Debt, Interest Rate

6.15%

South Pier At Harborside [Member] | Variable Rate Loan Due August 1, 2020 [Member]

Schedule of Equity Method Investments [Line Items]

Property Debt, Balance

$ 3,594

Property Debt, Maturity Date

Aug. 1, 2020

Bears interest at fixed rate range, minimum

6.09%

Bears interest at fixed rate range, maximum

6.62%

Letter of credit

$ 3,600

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]

$ 1,054

$ 907

The Shops At 40 Park Property [Member] | Rosewood Morristown, L.L.C. [Member]

Schedule of Equity Method Investments [Line Items]

Square feet | ft²

50,973

Property Debt, Balance

$ 6,489

Property Debt, Maturity Date

Aug. 1, 2018

Property Debt, Interest Rate

3.63%

Residual ownership interest

12.50%

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, 2016

Property Debt, Interest Rate, Spread Over LIBOR

2.50%

Indirect ownership interest

25.00%

Number of stories | item

5

Additional borrowing capacity

$ 1,000

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%

Multi-Family Properties [Member]

Schedule of Equity Method Investments [Line Items]

Number of Apartment Units | item

5,644

[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 September 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) an amortizable loan, collateralized by the Shops at 40 Park, with a balance of $6,489, bears interest at 3.63 percent, matures in August 2018; 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 2016. 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 with a maximum borrowing amount of $23,400 converted to a permanent loan on July 14, 2015. See discussion in Recent Transactions following in this footnote.

[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 $0.5 million to be drawn at September 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. See discussion in Recent Transactions following in this footnote.

[22]

Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $85,521 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 $4.4 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 $41,849 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $72,329 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 value for this venture of $1,419 and $1,854 as of September 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 $60,498, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $3,594, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020. The Company posted a $3.6 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 Unconsolidated48

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	$ 3,135	$ (1,268)	$ (2,723)	$ (2,060)
Marbella RoseGarden, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	64	3	186	(13)
RoseGarden Monaco Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(295)	(249)	(924)	(764)
Rosewood Lafayette Holdings, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		(221)	(62)	(639)
Rosewood Morristown, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(93)	(90)	(277)	(264)
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	(16)	(217)	(263)	(155)
PruRose Riverwalk G, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(151)	(615)	(681)	(1,766)
Elmajo Urban Renewal Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures				(203)
Crystal House Apartments Investors LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(44)	68	(41)	(206)
Portside Master Company, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(379)	(228)	(1,736)	(661)
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	(257)	(220)	(988)	(638)
Roseland/Port Imperial Partners, L.P. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(85)	(173)	(394)	(518)
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	(54)		(377)
Capitol Place Mezz LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(1,454)		(2,642)
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)
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	(12)		(32)	(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	110	101	332	306
12 Vreeland Associates, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	38	22	110	165
BNES Associates III [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	13	127	133	273
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)
KPG-P 100 IMW JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(37)	(412)	(800)	(1,548)
Keystone-Penn [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	3,663		3,663
Keystone-TriState [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(173)	(733)	(1,763)	(733)
KPG-MCG Curtis JV, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	327	113	755	364
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	102	74	258	220
Roseland/North Retail, L.L.C. [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	(17)	(34)	(52)	(81)
South Pier At Harborside [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	1,151	583	1,934	1,874
Stamford SM LLC [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures		493		2,337
Other [Member]
Schedule of Equity Method Investments [Line Items]
Company's equity in earnings (loss) of unconsolidated joint ventures	$ 734	$ 340	$ 943	$ 876

Investments In Unconsolidated49

Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments In Unconsolidated Joint Ventures [Abstract]
Rental property, net	$ 1,602,899	$ 1,534,812
Other assets	460,762	398,222
Total assets	2,063,661	1,933,034
Mortgages and loans payable	1,246,582	1,060,020
Other liabilities	228,045	211,340
Partners'/members' capital	589,034	661,674
Total liabilities and partners'/members' capital	$ 2,063,661	$ 1,933,034

Investments In Unconsolidated50

Investments In Unconsolidated Joint Ventures (Summary Of Results Of Operations Of Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments In Unconsolidated Joint Ventures [Abstract]
Total revenues	$ 82,586	$ 80,711	$ 238,138	$ 224,822
Operating and other expenses	(55,969)	(58,684)	(169,278)	(173,642)
Depreciation and amortization	(16,823)	(15,134)	(51,632)	(31,715)
Interest expense	(14,622)	(11,296)	(39,280)	(26,423)
Net loss	$ (4,828)	$ (4,403)	$ (22,052)	$ (6,958)

Deferred Charges, Goodwill An51

Deferred Charges, Goodwill And Other Assets, Net (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Deferred Charges, Goodwill And Other Assets [Line Items]
Deferred leasing costs		$ 232,291	$ 239,138
Deferred financing costs		20,823	24,042
Deferred charges, gross		253,114	263,180
Accumulated amortization		(119,965)	(122,358)
Deferred charges, net		133,149	140,822
Notes receivable	[1]	13,557	21,491
In-place lease values, related intangibles and other assets, net		4,936	6,565
Goodwill		2,945	2,945
Prepaid expenses and other assets, net		46,136	32,827
Total deferred charges, goodwill and other assets		200,723	$ 204,650
Mortgage Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable		$ 10,400
Spread over LIBOR		6.00%
Mortgage loan, maturity date		Aug. 1, 2016
Interest-Free Notes Receivable [Member]
Deferred Charges, Goodwill And Other Assets [Line Items]
Notes receivable		$ 3,100
Mortgage loan, maturity date		Apr. 1, 2023
[1]	Includes as of September 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 $3.1 million and matures in April 2023. The Company believes these balances are fully collectible.

Deferred Charges, Goodwill an52

Deferred Charges, Goodwill and Other Assets, Net (Summary Of Notional Amount And Fair Value Of Derivative Financial Instruments) (Details) - USD ($)		3 Months Ended	9 Months Ended
		Sep. 30, 2015	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair Value		$ 3,000	$ 3,000	$ 95,000
Interest and other investment income (loss)		(12,000)	(92,000)
LIBOR Cap One [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 51,000,000	$ 51,000,000
Strike Rate		1.50%	1.50%
Effective Date			Sep. 1, 2014
Expiration Date			Oct. 1, 2015
Fair Value				1,000
LIBOR Cap Two [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 24,000,000	$ 24,000,000
Strike Rate		1.50%	1.50%
Effective Date			Sep. 1, 2014
Expiration Date			Oct. 1, 2015
Fair Value				1,000
LIBOR Cap Three [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 51,000,000	$ 51,000,000
Strike Rate		1.75%	1.75%
Effective Date			Oct. 1, 2015
Expiration Date			Oct. 1, 2016
Fair Value		$ 2,000	$ 2,000	64,000
LIBOR Cap Four [Member]
Derivatives, Fair Value [Line Items]
Notional Value	[1]	$ 24,000,000	$ 24,000,000
Strike Rate		1.75%	1.75%
Effective Date			Oct. 1, 2015
Expiration Date			Oct. 1, 2016
Fair Value		$ 1,000	$ 1,000	$ 29,000
[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	Sep. 30, 2015	Dec. 31, 2014
Restricted Cash [Abstract]
Security deposits	$ 7,681	$ 7,795
Escrow and other reserve funds	32,387	26,450
Total restricted cash	$ 40,068	$ 34,245

Senior Unsecured Notes (Summary

Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 1,268,568	$ 1,267,744
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]
Debt Instrument [Line Items]
Senior Unsecured Notes		$ 200,029	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		$ 249,372	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		$ 249,173	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		$ 299,609	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		$ 270,385	$ 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 Fa55

Unsecured Revolving Credit Facility (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015USD ($)itementity	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings under the facility	$ 35,000,000
Unsecured Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Number of lending institutions | entity	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 | item	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 Company will not make any excess distributions except to enable the Company 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 September 30, 2015.
Outstanding borrowings under the facility	$ 35,000,000	$ 0
Unsecured Revolving Credit Facility Extension 1 [Member]
Line of Credit Facility [Line Items]
Credit facility extension fee, basis points	0.075%
Unsecured Revolving Credit Facility Extension 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 | item	1.5
Unencumbered property interest coverage | item	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 Fa56

Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details) - Unsecured Revolving Credit Facility [Member]	9 Months Ended
	Sep. 30, 2015
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%
Baa3 [Member] | BBB- [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%
Baa2 [Member] | BBB [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%
Baa1 [Member] | BBB+ [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 57

Mortgages, Loans Payable And Other Obligations (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015USD ($)property	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Number of properties with encumbered company mortgages | property	24
Book value of encumbered properties	$ 917,000,000
Cash paid for interest	85,019,000	$ 92,096,000
Interest capitalized	11,744,000	10,650,000
Total indebtedness	$ 2,043,592,000		$ 2,088,654,000
Total indebtedness, weighted average interest rate	5.41%		5.64%
Revolving Credit Facility Borrowing And Other Variable Rate Mortgage Debt [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 177,839,000		$ 159,860,000
Total indebtedness, weighted average interest rate	3.41%		3.83%
Fixed Rate Debt And Other Obligations [Member]
Debt Instrument [Line Items]
Total indebtedness	$ 1,865,753,000		$ 1,928,794,000
Total indebtedness, weighted average interest rate	5.60%		5.79%
Unconsolidated Joint Venture [Member]
Debt Instrument [Line Items]
Interest capitalized	$ 3,769,000	$ 3,284,000

Mortgages, Loans Payable And 58

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details) $ in Thousands		9 Months Ended
		Sep. 30, 2015USD ($)propertyitem	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Mortgages, loans payable and other obligations		$ 740,024		$ 820,910
Repayment of mortgages, loans payable and other obligations		$ 29,307	$ 44,825
Overlook - Site IIID, IIIC, IIIA [Member]
Debt Instrument [Line Items]
Property Name	[1]	Overlook - Site IIID,IIIC, IIIA (b)
Lender	[1]	Wells Fargo Bank N.A.
LIBOR	[1],[2]	LIBOR+3.50
Property Debt, Interest Rate, Spread Over LIBOR		3.50%
Mortgages, loans payable and other obligations	[1]			17,260
Overlook - Site IIB [Member]
Debt Instrument [Line Items]
Property Name	[1]	Overlook - Site IIB (Quarrystone I) (b)
Lender	[1]	Wells Fargo Bank N.A.
LIBOR	[1],[2]	LIBOR+2.50
Property Debt, Interest Rate, Spread Over LIBOR		2.50%
Mortgages, loans payable and other obligations	[1]			5,787
10 Independence [Member]
Debt Instrument [Line Items]
Property Name	[3]	10 Independence (c)
Lender	[3]	Wells Fargo CMBS
Effective rate	[2],[3]	10.26%
Mortgages, loans payable and other obligations	[3]			16,924
4 Sylvan [Member]
Debt Instrument [Line Items]
Property Name	[4]	4 Sylvan (d)
Lender	[4]	Wells Fargo CMBS
Effective rate	[2],[4]	10.26%
Mortgages, loans payable and other obligations	[4]			14,575
210 Clay [Member]
Debt Instrument [Line Items]
Property Name	[5]	210 Clay (e)
Lender	[5]	Wells Fargo CMBS
Effective rate	[2],[5]	18.10%
Mortgages, loans payable and other obligations	[5]			13,330
5 Becker [Member]
Debt Instrument [Line Items]
Property Name	[6]	5 Becker (f)
Lender	[6]	Wells Fargo CMBS
Effective rate	[2],[6]	19.45%
Mortgages, loans payable and other obligations	[6]			13,867
6 Becker, 85 Livingston, 75 Livingston & 20 Waterview [Member]
Debt Instrument [Line Items]
Property Name	[7]	6 Becker, 85 Livingston, 75 Livingston & 20 Waterview
Lender	[7]	Wells Fargo CMBS
Effective rate	[2],[7]	10.26%
Mortgages, loans payable and other obligations	[7]	$ 65,035		65,035
Loan maturity date	[7],[8]	Aug. 11, 2014
Number of properties used to collateralized mortgage | property		4
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		$ 3,809		3,951
Loan maturity date	[9]	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
Property Debt, Interest Rate, Spread Over LIBOR		1.75%
Mortgages, loans payable and other obligations		$ 44,771		44,119
Loan maturity date		Nov. 18, 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		$ 39,914		39,421
Loan maturity date		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
Property Debt, Interest Rate, Spread Over LIBOR	[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		3.501%
Property Debt, Interest Rate, 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		9.707%
Property Debt, Interest Rate, 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]	$ 144,037		145,557
Loan maturity date	[12]	Jan. 15, 2017
Number of properties used to collateralized 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
Property Debt, Interest Rate, Spread Over LIBOR		2.35%
Mortgages, loans payable and other obligations		$ 6,568		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		$ 28,713		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		$ 218,717		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		$ 18,342		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]	$ 42,018		42,476
Loan maturity date	[14]	Feb. 1, 2019
Number of properties used to collateralized 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
Property Debt, Interest Rate, Spread Over LIBOR	[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]	On March 27, 2015, the Company repaid these loans at par, using borrowings on the Company's unsecured revolving credit facility.
[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]	On May 27, 2015, the Company transferred the deed for 10 Independence Boulevard to the lender in satisfaction of its obligation. See Note 3: Recent Transactions.
[4]	On June 11, 2015, the Company transferred the deed for 4 Sylvan Way to the lender in satisfaction of its obligation. See Note 3: Recent Transactions.
[5]	On July 21, 2015, the Company transferred the deed for 210 Clay to the lender in satisfaction of its obligation. See Note 3: Recent Transactions.
[6]	On August 24, 2015, the Company transferred the deed for 5 Becker to the lender in satisfaction of its obligation. See Note 3: Recent Transactions.
[7]	Mortgage is cross collateralized by the four properties.
[8]	The loan was not repaid at maturity and the Company is in discussions with the lender regarding potential options in satisfaction of the obligation.
[9]	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 at maturity on May 1, 2015. The Company is in discussions with the lender regarding a further extension of the loan.
[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 3.501 percent at September 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 9.707 percent at September 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.

Employee Benefit 401(k) Plans59

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements (Details) - USD ($)	May. 11, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 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 Company did not make any contributions to the 401(k) Plan in the nine months ended September 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 Company at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Company.
Expenses for employee benefit plan		$ 0	$ 24,000	$ 0	$ 77,000
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 Lefkowitz And Messr Thomas [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expenses for employee benefit plan				$ 1,200,000
Messr Hersh [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expenses for employee benefit plan	$ 2,300,000
Deferred Retirement Compensation Units [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Expenses for employee benefit plan		$ 0	$ 47,000	$ 0	$ 1,300,000

Disclosure Of Fair Value Of A60

Disclosure Of Fair Value Of Assets And Liabilities (Narrative) (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Disclosure Of Fair Value Of Assets And Liabilities [Abstract]
Fair value of Company's long-term debt	$ 2,067,463,000	$ 2,133,214,000
Book value of Company's long-term debt	$ 2,043,592,000	$ 2,088,654,000

Disclosure Of Fair Value Of A61

Disclosure Of Fair Value Of Assets And Liabilities (Schedule Of Valuation Techniques And Significant Unobservable Inputs) (Details) - Level 3 [Member] - Discounted Cash Flow [Member]	9 Months Ended
	Sep. 30, 2015USD ($)
Discount Rate [Member] | Suburban [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	$ 438,606,000
Discount Rate [Member] | Suburban [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	8.00%
Discount Rate [Member] | Suburban [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	15.00%
Discount Rate [Member] | Central Business District [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	6.00%
Discount Rate [Member] | Central Business District [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	8.00%
Exit Capitalization Rate [Member] | Suburban [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	7.50%
Exit Capitalization Rate [Member] | Suburban [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	9.00%
Exit Capitalization Rate [Member] | Central Business District [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	4.60%
Exit Capitalization Rate [Member] | Central Business District [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate	5.75%

Commitments And Contingencies62

Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Harborside Financial Center Plaza 4-A [Member]
Commitments And Contingencies [Line Items]
Project period			20 years
Percentage of PILOT on project costs			2.00%
Total project costs			$ 49,500,000
Payments in lieu of property taxes (PILOT)	$ 247,000	$ 247,000	$ 742,000	$ 742,000
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
Payments in lieu of property taxes (PILOT)	$ 854,000	$ 854,000	$ 2,600,000	$ 2,600,000
Port Imperial South 4/5 Garage [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 Contingencies63

Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Commitments And Contingencies [Abstract]
Ground lease expense incurred	$ 102,000	$ 102,000	$ 305,000	$ 305,000

Commitments And Contingencies64

Commitments And Contingencies (Roseland Contingent Consideration) (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Oct. 23, 2012
Business Acquisition, Contingent Consideration [Line Items]
(Increase) decrease in accounts receivable, net			$ 603,000	$ 1,911,000
Roseland Partners, L.L.C. [Member]
Business Acquisition, Contingent Consideration [Line Items]
Fair value of contingent consideration					$ 10,000,000
Business acquisition, contingent cash payment	$ 1,200,000		1,200,000
Benefit related to change in fair value of Earn Out liability	$ 219,000		219,000
Interest and other investment income		$ 0		$ 380,000
Purchase accounting adjustments			$ 0
Completion/Start Of Certain Developments [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	92.00%		92.00%
Completion/Start Of Certain Developments [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	99.00%		99.00%
Obtaining Of Tax Credits/Grants [Member]
Business Acquisition, Contingent Consideration [Line Items]
Probability of occurrence	50.00%		50.00%

Commitments And Contingencies65

Commitments And Contingencies (Departure Of Executive Officer) (Narrative) (Details)	May. 11, 2015USD ($)itemshares	Sep. 30, 2015USD ($)shares	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Commitments And Contingencies [Line Items]
Severance benefits | $			$ 11,000,000	$ 23,800,000
Restricted stock units vested		249,795
Accounts payable, accrued expenses and other liabilities | $		$ 136,673,000		126,971,000
Employee Severance [Member]
Commitments And Contingencies [Line Items]
Accounts payable, accrued expenses and other liabilities | $		$ 11,500,000		$ 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
Shares issued		45,062
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 Contingencies66

Commitments And Contingencies (Other) (Narrative) (Details) $ in Thousands	Oct. 06, 2015USD ($)item	Apr. 01, 2015USD ($)item	Sep. 30, 2015USD ($)ft²propertyitem	Sep. 30, 2015USD ($)ft²propertyitem	Sep. 30, 2015USD ($)ft²propertyitem	Sep. 30, 2014USD ($)	Dec. 31, 2017item
Commitments And Contingencies [Line Items]
Amount outstanding			$ 35,000	$ 35,000	$ 35,000
Investment in unconsolidated joint ventures					68,468	$ 57,568
Development of rental property					49,959	4,881
Purchase price of property					$ 59,700	$ 77,109
Eastchester Project [Member]
Commitments And Contingencies [Line Items]
Percentage of interest in venture			76.25%	76.25%	76.25%
Costs of the project incurred					$ 13,500
Delivery date to tenant					second quarter of 2016
Number of units | item			108	108	108
Project costs incurred to date			$ 22,700	$ 22,700	$ 22,700
Amount of project costs funded by members			20,900	20,900	20,900
Total project costs					50,000
Amount to fund			7,400	7,400	7,400
City Square Project [Member]
Commitments And Contingencies [Line Items]
Costs of the project incurred				7,100	7,100
Number of units | item		365
Total project costs			92,500		92,500
Purchase price of property		$ 3,100
Contingent consideration		$ 1,250
Amount to fund			$ 85,400	$ 85,400	$ 85,400
City Square Project Phase One [Member]
Commitments And Contingencies [Line Items]
Number of units | item			237	237	237
City Square Project Phase Two [Member] | Scenario, Forecast [Member]
Commitments And Contingencies [Line Items]
Number of units | item							128
Property Lock-Ups [Member]
Commitments And Contingencies [Line Items]
Number of properties | property			7	7	7
Properties aggregate net book value					$ 57,300
Expiration year					2,016
Property Lock-Ups Expired [Member]
Commitments And Contingencies [Line Items]
Number of properties | property			110	110	110
Properties aggregate net book value					$ 1,300,000
150 Main Street, L.L.C. [Member] | Construction Loan [Member] | Eastchester Project [Member]
Commitments And Contingencies [Line Items]
Maximum borrowing capacity			$ 28,800	$ 28,800	28,800
Amount outstanding			$ 6,600	$ 6,600	6,600
Wegmans Food Markets, Inc. [Member]
Commitments And Contingencies [Line Items]
Costs of the project incurred					$ 13,900
Delivery date to tenant					first quarter of 2017
Total project costs					$ 28,700
Area Of Real Estate Property | ft²			140,000	140,000	140,000
Amount to fund			$ 14,800	$ 14,800	$ 14,800
Development Property [Member] | Chase II Project [Member]
Commitments And Contingencies [Line Items]
Costs of the project incurred					$ 12,400
Number of units | item			1,034	1,034	1,034
Total project costs					$ 74,400
Amount to fund			$ 62,000	$ 62,000	$ 62,000
Development Property [Member] | Chase II Project, Initial Phase [Member]
Commitments And Contingencies [Line Items]
Number of units | item			292	292	292
Unconsolidated Joint Venture Hotel [Member]
Commitments And Contingencies [Line Items]
Number of units | item			350	350	350
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member]
Commitments And Contingencies [Line Items]
Percentage of interest in venture	90.00%
Cash consideration	$ 27,300
Capital credit	23,700
Amount to fund	$ 4,800
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | XS Port Imperial Hotel, LLC [Member]
Commitments And Contingencies [Line Items]
Number of units | item	364
Ownership percentage of third party venture	10.00%
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | Port Imperial Hotel [Member]
Commitments And Contingencies [Line Items]
Total project costs	$ 129,600
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | XS Hotel [Member]
Commitments And Contingencies [Line Items]
Cash consideration	3,000
Subsequent Event [Member] | Unconsolidated Joint Venture Hotel [Member] | Construction Loan [Member] | Port Imperial Hotel [Member]
Commitments And Contingencies [Line Items]
Amount to fund	$ 94,000

Commitments And Contingencies67

Commitments And Contingencies (Future Minimum Rental Payments Of Ground Leases) (Details) $ in Thousands	Sep. 30, 2015USD ($)
Commitments And Contingencies [Abstract]
October 1 through December 31, 2015	$ 99
2,016	387
2,017	267
2,018	232
2,019	235
2020 through 2084	15,583
Total	$ 16,803

Tenant Leases (Details)

Tenant Leases (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)
Property Subject to or Available for Operating Lease [Line Items]
October 1 through December 31, 2015	$ 112,433
2,016	452,893
2,017	410,203
2,018	327,024
2,019	263,918
2020 and thereafter	1,077,550
Total	$ 2,644,021
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

Mack-Cali Realty Corporation 69

Mack-Cali Realty Corporation Stockholders' Equity (Share Repurchase Program And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) - USD ($)	9 Months Ended	34 Months Ended
	Sep. 30, 2015	Jun. 30, 2015
Stockolders Equity [Line Items]
Date share repurchase program was initiated	September 2,012
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
Dividend Reinvestment And Stock Purchase Plan [Member]
Stockolders Equity [Line Items]
Common stock reserved for future issuance	5,500,000
Monthly cash investment without restriction, maximum	$ 5,000

Mack-Cali Realty Corporation 70

Mack-Cali Realty Corporation Stockholders' Equity (Stock Options Plans) (Narrative) (Details)	Jun. 05, 2015item$ / sharesshares	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)$ / sharesshares	Sep. 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 8 months 12 days		4 years 10 months 24 days
Share price | $ / shares	$ 17.31	$ 3.06		$ 3.06
Options exercised				0	0
Stock options expense | $		$ 185,000	$ 1,000	$ 248,000	$ 3,000
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
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
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
Employee And Director Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		2,700,000		2,700,000
Employee And Director Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		4,350,000		4,350,000
2000 Employee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable time period				5 years
2000 Employee Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		2,500,000		2,500,000
2000 Employee Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		4,000,000		4,000,000
2000 Director Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable time period				1 year
2000 Director Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		200,000		200,000
2000 Director Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved stocks for issuance		350,000		350,000

Mack-Cali Realty Corporation 71

Mack-Cali Realty Corporation Stockholders' Equity (Restricted Stock Awards And Performance Share Units/TSR-Based Awards) (Narrative) (Details) $ / shares in Units, $ in Millions	Jun. 05, 2015shares	May. 11, 2015shares	Mar. 31, 2014shares	Sep. 12, 2012shares	Sep. 11, 2012shares	Sep. 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						249,795
Unvested restricted stock outstanding						136,557		346,946
Shares granted						41,337
Messr Hersh [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested		210,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock outstanding						99,006
Restricted stock awards unvested shares outstanding, performance contingent						210,000
Shares granted				319,667
Restricted Stock [Member] | 2013 Incentive Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	37,550.54
Performance period						3 years
Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation vesting period						1 year
Restricted Stock [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]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested			109,667
Ratified Restricted Stock Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation vesting period						5 years
Ratified Restricted Stock Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation vesting period						7 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
Shares granted					5,160		1,032
Value of common stock received upon vesting of awards | $ / shares						$ 1,000
Shares issued						45,062
Total unrecognized compensation cost | $						$ 2.5
Total unrecognized compensation cost, period of recognition						1 year 10 months 24 days
Total Stockholder Return Based Awards [Member] | Messr Hersh [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested		675
Shares issued		41,811
Performance Shares [Member] | Employee Severance [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested		84,000
Shares granted and vested		126,000
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] | 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%
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%

Mack-Cali Realty Corporation 72

Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Maximum percentage of retainer fee that directors may defer	100.00%
Deferred stock units earned	15,279	15,230
Deferred stock units outstanding	173,025		157,730

Mack-Cali Realty Corporation 73

Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share) (Narrative) (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Anti-dilutive securities excluded from the computation of earnings per share			405,000	10,000
Dividends declared per common share	$ 0.15	$ 0.15	$ 0.45	$ 0.60
Unvested restricted stock outstanding	136,557		136,557		346,946
Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock outstanding	99,006	304,816	99,006	304,816

Mack-Cali Realty Corporation 74

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 05, 2015	Sep. 30, 2015
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Shares Under Options - Outstanding, beginning balance		10,000
Shares under options - Granted	800,000	800,000
Shares Under Options - Outstanding, ending balance		805,000
Shares Under Options - Available for grant		3,416,456
Weighted Average Exercise Price - Outstanding, beginning balance		$ 33.36
Weighted Average Exercise Price - Exercised/Cancelled		5,000
Weighted Average Exercise Price - Granted		17.31
Weighted Average Exercise Price - Lapsed or Cancelled		45.47
Weighted Average Exercise Price - Outstanding, ending balance		$ 17.33
Aggregate Intrinsic Value, Outstanding, ending balance		$ 1,244
Outstanding stock option price range, lower range		$ 17.31
Outstanding stock option price range, upper range		$ 21.25

Mack-Cali Realty Corporation 75

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Weighted Average Assumptions) (Details)	9 Months Ended
	Sep. 30, 2015
Time Vesting Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 years
Risk-free interest rate	2.04%
Volatility	29.00%
Dividend yield	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
Risk-free interest rate	1.96%
Volatility	29.00%
Dividend yield	3.50%

Mack-Cali Realty Corporation 76

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Restricted Stock Awards) (Details)	9 Months Ended
	Sep. 30, 2015item$ / sharesshares
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Shares, Outstanding, Beginning balance | shares	346,946
Shares granted | shares	41,337
Shares, Vested | shares	(249,795)
Shares, Forfeited | shares	(1,931)
Shares, Outstanding, Ending balance | shares	136,557
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	21.44
Weighted-Average Grant-Date Fair Value, Forfeited	20.31
Weighted-Average Grant-Date Fair Value, Outstanding ending balance	$ 19.37
Number of executive officers who departed | item	2

Mack-Cali Realty Corporation 77

Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share Tables - Basic Computation Of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Net income (loss)	$ (142,141)	$ 2,085	$ (106,077)	$ 41,804
Increase (decrease) in noncontrolling interest			(251)
Add (deduct): Noncontrolling interest in Operating Partnership	15,530	(248)	11,461	(4,754)
Net income (loss) available to common shareholders	$ (126,892)	$ 1,982	$ (94,034)	$ 37,807
Weighted average common shares	89,249	88,875	89,229	88,621
Net income available to common shareholders	$ (1.42)	$ 0.02	$ (1.05)	$ 0.43

Mack-Cali Realty Corporation 78

Mack-Cali Realty Corporation Stockholders' Equity (Earnings Per Share Tables - Diluted Computation Of EPS) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Net income (loss) available to common shareholders	$ (126,892)	$ 1,982	$ (94,034)	$ 37,807
Add (deduct): Noncontrolling interest in Operating Partnership	(15,530)	248	(11,461)	4,754
Net income (loss) for diluted earnings per share	$ (142,422)	$ 2,230	$ (105,495)	$ 42,561
Weighted average common shares	100,172	100,052	100,236	100,014
Net income available to common unitholders	$ (1.42)	$ 0.02	$ (1.05)	$ 0.43

Mack-Cali Realty Corporation 79

Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Mack-Cali Realty Corporation Stockholders' Equity [Abstract]
Basic EPS shares	89,249	88,875	89,229	88,621
Add: Operating Partnership - common units	10,923	11,120	11,007	11,334
Restricted Stock Awards		57		59
Diluted EPS Shares	100,172	100,052	100,236	100,014

Noncontrolling Interests In S80

Noncontrolling Interests In Subsidiaries (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2015USD ($)property$ / shares	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Number of common shares received upon redemption of common units | $ / shares	$ 1
Rebalance of ownership percentage | $	$ (0.3)
Percentage of noncontrolling interest	10.80%	11.10%
Participation Rights [Member]
Noncontrolling Interest [Line Items]
Number of properties	3
Excess net cash flow remaining after the distribution to the Company	50.00%
Internal rate of return	10.00%
Future Developments [Member] | Participation Rights [Member]
Noncontrolling Interest [Line Items]
Number of properties	1

Noncontrolling Interests In S81

Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details)	9 Months Ended
	Sep. 30, 2015shares
Noncontrolling Interests In Subsidiaries [Abstract]
Balance, Beginning	11,083,876
Redemption of common units for shares of common stock	(293,734)
Balance, Ending	10,790,142

Noncontrolling Interests In S82

Noncontrolling Interests In Subsidiaries (Schedule Of Activity Of Noncontrolling Interests) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Noncontrolling Interest [Line Items]
Balance, value	$ 257,230
Common unit distributions	(4,927)
Increase in noncontrolling interest in consolidated joint ventures	251
Balance, value	235,417
Noncontrolling Interests In Subsidiaries [Member]
Noncontrolling Interest [Line Items]
Balance, value	257,230	$ 276,096
Net income (loss)	(12,043)	3,997
Common unit distributions	(4,927)	(6,793)
Increase in noncontrolling interest in consolidated joint ventures	251	487
Redemption of common units for common stock	(5,370)	(14,211)
Rebalancing of ownership percentage between parent and subsidiaries	276	257
Balance, value	$ 235,417	$ 259,833

Segment Reporting (Narrative) (

Segment Reporting (Narrative) (Details)	9 Months Ended
	Sep. 30, 2015USD ($)segment	Sep. 30, 2014USD ($)	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				9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014		Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues		$ 146,158		$ 155,489		$ 448,440		$ 485,385
Total operating and interest expenses	[1]	101,877		110,417		320,061		364,690
Equity in earnings (loss) of unconsolidated joint ventures		3,135		(1,268)		(2,723)		(2,060)
Net operating income (loss)	[2]	47,416		43,804		125,656		118,635
Total assets		4,001,902				4,001,902				$ 4,192,247
Total long-lived assets	[3]	3,424,525				3,424,525				3,670,704
Investments in unconsolidated joint ventures		299,486				299,486				247,468
Corporate & Other, Including Eliminations [Member]
Segment Reporting Information [Line Items]
Total revenues	[4]	(1,125)		(1,181)		(3,139)		(3,102)
Total operating and interest expenses	[1],[4]	28,236		28,102		79,804		97,053
Net operating income (loss)	[2],[4]	(29,361)		(29,283)		(82,943)		(100,155)
Total assets	[4]	47,175				47,175				45,705
Total long-lived assets	[3],[4]	(1,865)				(1,865)				(622)
Real Estate - Commercial And Other [Member]
Segment Reporting Information [Line Items]
Total revenues		131,910		141,659		406,128		446,036
Total operating and interest expenses	[1]	59,810		68,537		199,178		228,571
Equity in earnings (loss) of unconsolidated joint ventures		5,181		328		4,611		3,145
Net operating income (loss)	[2]	77,281		73,450		211,561		220,610
Total assets		3,197,838				3,197,838				3,473,176
Total long-lived assets	[3]	2,914,461				2,914,461				3,181,225
Investments in unconsolidated joint ventures		76,715				76,715				81,649
Real Estate - Multi Family [Member]
Segment Reporting Information [Line Items]
Total revenues		6,964		6,711		20,541		19,801
Total operating and interest expenses	[1]	4,233		3,529		12,775		10,276
Equity in earnings (loss) of unconsolidated joint ventures		(2,793)		(2,088)		(8,290)		(6,566)
Net operating income (loss)	[2]	(62)		1,094		(524)		2,959
Total assets		747,039				747,039				662,208
Total long-lived assets	[3]	508,212				508,212				486,243
Investments in unconsolidated joint ventures		221,717				221,717				164,912
Multi Family Services [Member]
Segment Reporting Information [Line Items]
Total revenues		8,409	[5]	8,300	[6]	24,910	[7]	22,650	[8]
Total operating and interest expenses	[1]	9,598		10,249		28,304		28,790
Equity in earnings (loss) of unconsolidated joint ventures		747		492		956		1,361
Net operating income (loss)	[2]	(442)		(1,457)		(2,438)		(4,779)
Total assets		9,850				9,850				11,158
Total long-lived assets	[3]	3,717				3,717				3,858
Investments in unconsolidated joint ventures		1,054				1,054				$ 907
Fee revenue		$ 1,621		$ 1,199		$ 4,452		$ 2,962
[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. The Company recorded an impairment charge of $164.2 million on assets included in the commercial and other real estate business segment for the three and nine months ended September 30, 2015. See Note 3: Recent Transactions - Impairments on Properties Held and Used.
[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 $1,621 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[6]	Includes $1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[7]	Includes $4,452 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[8]	Includes $2,962 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		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting [Abstract]
Net operating income	[1]	$ 47,416	$ 43,804	$ 125,656	$ 118,635
Depreciation and amortization		(44,099)	(41,983)	(127,266)	(131,679)
Realized gains (losses) on disposition of rental property, net		18,718	264	53,261	54,848
Gain on sale of investment in unconsolidated joint ventures				6,448
Impairments		(164,176)		(164,176)
Net income (loss)		(142,141)	2,085	(106,077)	41,804
Noncontrolling interest in consolidated joint ventures				(251)
Noncontrolling interest in Operating Partnership		15,530	(248)	11,461	(4,754)
Net income (loss) available to common shareholders		$ (126,892)	$ 1,982	$ (94,034)	$ 37,807
[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.