Mack Cali Realty L P 10-Q 23 Oct 14 2014 Q3 Quarterly report Financial data

Document_And_Entity_Informatio

Document And Entity Information	9 Months Ended
	Sep. 30, 2014
Document And Entity Information [Abstract]	'
Entity Registrant Name	'MACK CALI REALTY L P
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Sep-14
Entity Central Index Key	'0001067063
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q3
Entity Common Stock, Shares Outstanding	0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Rental property	'	'
Land and leasehold interests	$746,066	$750,658
Buildings and improvements	3,731,700	3,915,800
Tenant improvements	421,291	456,003
Furniture, fixtures and equipment	10,670	7,472
Gross investment in rental property	4,909,727	5,129,933
Less - accumulated depreciation and amortization	-1,379,911	-1,400,988
Net investment in rental property	3,529,816	3,728,945
Cash and cash equivalents	105,528	221,706
Investments in unconsolidated joint ventures	239,767	181,129
Unbilled rents receivable, net	124,278	136,304
Deferred charges, goodwill and other assets	320,396	218,519
Restricted cash	26,571	19,794
Accounts receivable, net of allowance for doubtful accounts of $1,408 and $2,832	10,841	8,931
Total assets	4,357,197	4,515,328
LIABILITIES AND EQUITY	'	'
Senior unsecured notes	1,417,439	1,616,575
Mortgages, loans payable and other obligations	821,202	746,191
Distributions payable	15,188	29,938
Accounts payable, accrued expenses and other liabilities	126,580	121,286
Rents received in advance and security deposits	47,792	53,730
Accrued interest payable	24,713	29,153
Total liabilities	2,452,914	2,596,873
Commitments and contingencies	'	'
Partners' Capital:	'	'
General Partner, 89,055,220 and 88,247,591 common units outstanding	1,587,448	1,585,100
Limited partners, 11,092,044 and 11,864,775 common units outstanding	261,822	278,072
Total Mack-Cali Realty, L.P. partners' capital	1,849,270	1,863,172
Noncontrolling interests in consolidated joint ventures	55,013	55,283
Total equity	1,904,283	1,918,455
Total liabilities and equity	$4,357,197	$4,515,328

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Consolidated Balance Sheets [Abstract]	'	'
Allowance for doubtful accounts receivable	$1,408	$2,832
General partner common units outstanding	89,055,220	88,247,591
Limited partners common units outstanding	11,092,044	11,864,775

Consolidated_Statements_Of_Ope

Consolidated Statements Of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
REVENUES	'	'	'	'
Base rents	$125,793	$134,882	$393,054	$403,943
Escalations and recoveries from tenants	19,172	17,173	61,736	54,117
Construction services	'	678	'	15,650
Real estate services	7,622	7,003	21,323	20,088
Parking income	2,255	1,642	6,605	4,631
Other income	647	1,127	2,667	3,335
Total revenues	155,489	162,505	485,385	501,764
EXPENSES	'	'	'	'
Real estate taxes	22,154	20,572	69,880	62,055
Utilities	15,701	18,043	58,555	48,070
Operating services	26,519	25,852	83,581	76,487
Direct construction costs	'	609	'	14,945
Real estate services expenses	6,933	5,552	20,213	15,809
General and administrative	12,665	12,151	49,219	37,235
Depreciation and amortization	41,983	46,094	131,679	135,122
Impairments	'	48,700	'	48,700
Total expenses	125,955	177,573	413,127	438,423
Operating income (loss)	29,534	-15,068	72,258	63,341
OTHER (EXPENSE) INCOME	'	'	'	'
Interest expense	-27,353	-30,936	-85,458	-92,075
Interest and other investment income	908	187	2,216	1,287
Equity in earnings (loss) of unconsolidated joint ventures	-1,268	-229	-2,060	-2,059
Realized gains (losses) on disposition of rental property, net	264	'	54,848	'
Total other (expense) income	-27,449	-30,978	-30,454	-92,847
Income (loss) from continuing operations	2,085	-46,046	41,804	-29,506
Discontinued operations:	'	'	'	'
Income from discontinued operations	'	2,164	'	11,842
Loss from early extinguishment of debt	'	'	'	-703
Realized gains (losses) on disposition of rental property, net	'	47,321	'	61,079
Total discontinued operations	'	49,485	'	72,218
Net income	2,085	3,439	41,804	42,712
Noncontrolling interest in consolidated joint ventures	145	1,838	757	1,962
Net income available to common unitholders	$2,230	$5,277	$42,561	$44,674
Basic earnings per common unit:	'	'	'	'
Income (loss) from continuing operations	$0.02	($0.44)	$0.43	($0.28)
Discontinued operations	'	$0.49	'	$0.73
Net income available to common unitholders	$0.02	$0.05	$0.43	$0.45
Diluted earnings per common unit:	'	'	'	'
Income (loss) from continuing operations	$0.02	($0.44)	$0.43	($0.28)
Discontinued operations	'	$0.49	'	$0.73
Net income available to common unitholders	$0.02	$0.05	$0.43	$0.45
Basic weighted average units outstanding	99,995	99,787	99,955	99,778
Diluted weighted average units outstanding	100,052	99,787	100,014	99,778

Consolidated_Statement_Of_Chan

Consolidated Statement Of Changes In Equity (USD $)	General Partner Common Units [Member]	Limited Partners Common Units [Member]	General Partner Common Unitholders [Member]	Limited Partner Common Unitholders [Member]	Noncontrolling Interest In Consolidated Joint Ventures [Member]	Total
In Thousands			USD ($)	USD ($)	USD ($)	USD ($)
Balance, value at Dec. 31, 2012	'	'	'	'	$56,442	'
Net income	'	'	'	'	-1,962	42,712
Increase in noncontrolling interest	'	'	'	'	1,570	'
Balance, value at Sep. 30, 2013	'	'	'	'	56,050	'
Balance, units at Dec. 31, 2013	88,248	11,865	'	'	'	'
Balance, value at Dec. 31, 2013	'	'	1,585,100	278,072	55,283	1,918,455
Net income	'	'	37,807	4,754	-757	41,804
Distributions	'	'	-53,347	-6,793	'	-60,140
Increase in noncontrolling interest	'	'	'	'	487	487
Redemption of limited partner common units for shares of general partner common units, units	773	-773	'	'	'	'
Redemption of limited partner common units for shares of general partner common units, value	'	'	14,211	-14,211	'	'
Shares issued under Dividend Reinvestment and Stock Purchase Plan, units	5	'	'	'	'	'
Shares issued under Dividend Reinvestment and Stock Purchase Plan, value	'	'	102	'	'	102
Directors deferred compensation plan	'	'	310	'	'	310
Stock compensation, units	29	'	'	'	'	'
Stock compensation, value	'	'	3,265	'	'	3,265
Balance, units at Sep. 30, 2014	89,055	11,092	'	'	'	'
Balance, value at Sep. 30, 2014	'	'	$1,587,448	$261,822	$55,013	$1,904,283

Consolidated_Statements_Of_Cas

Consolidated Statements Of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES	'	'
Net income	$41,804	$42,712
Adjustments to reconcile net income to net cash provided by Operating activities:	'	'
Depreciation and amortization, including related intangible assets	132,698	135,148
Depreciation and amortization on discontinued operations	'	8,196
Amortization of deferred stock units	309	'
Amortization of stock compensation	6,439	2,451
Amortization of deferred financing costs and debt discount	2,306	2,379
Write off of unamortized discount on senior unsecured notes	'	156
Equity in (earnings) loss of unconsolidated joint venture, net	2,060	2,059
Distributions of cumulative earnings from unconsolidated joint ventures	10,974	6,468
Realized (gains) on disposition of rental property, net	-54,848	-61,079
Impairments	'	48,700
Changes in operating assets and liabilities:	'	'
Increase in unbilled rents receivable, net	-4,477	-8,504
Increase in deferred charges, goodwill and other assets	-23,042	-27,584
(Increase) decrease in accounts receivable, net	-1,911	1
Increase in accounts payable, accrued expenses and other liabilities	13,565	5,967
Decrease in rents received in advance and security deposits	-5,938	-10,059
Decrease in accrued interest payable	-4,440	-4,083
Net cash provided by operating activities	115,499	142,928
CASH FLOWS FROM INVESTING ACTIVITIES	'	'
Rental property acquisitions and related intangibles	-46,883	-149,200
Rental property additions and improvements	-77,109	-67,172
Development of rental property, other related costs and deposits	-4,881	-12,954
Proceeds from the sale of rental property	274,839	332,540
Issuance of notes and mortgage receivable	-62,276	-16,425
Repayment of notes receivable	10,250	208
Investment in unconsolidated joint ventures	-57,568	-32,235
Distributions in excess of cumulative earnings from unconsolidated joint ventures	36,303	20,671
(Increase) decrease in restricted cash	-6,777	126
Net cash provided by investing activities	65,898	75,559
CASH FLOW FROM FINANCING ACTIVITIES	'	'
Borrowings from revolving credit facility	262,328	289,000
Repayment of revolving credit facility	-262,328	-289,000
Proceeds from senior unsecured notes	'	268,928
Repayment of senior unsecured notes	-200,000	-100,000
Proceeds from mortgages and loans payable	28,350	2,343
Repayment of mortgages, loans payable and other obligations	-44,825	-12,185
Payment of contingent consideration	-5,228	-2,755
Payment of financing costs	-1,021	-5,459
Payment of dividends and distributions	-74,851	-119,561
Net cash (used in) provided by financing activities	-297,575	31,311
Net (decrease) increase in cash and cash equivalents	-116,178	249,798
Cash and cash equivalents, beginning of period	221,706	58,245
Cash and cash equivalents, end of period	$105,528	$308,043

Organization_And_Basis_Of_Pres

Organization And Basis Of Presentation	9 Months Ended
	Sep. 30, 2014
Organization And Basis Of Presentation [Abstract]	'
Organization And Basis Of Presentation	'
	1.ORGANIZATION AND BASIS OF PRESENTATION
	Organization
	Mack-Cali Realty, L.P., a Delaware limited partnership, together with its subsidiaries (collectively, the “Company” or “Operating Partnership”), was formed on May 31, 1994 to conduct the business of providing leasing, management, acquisition, development, construction and tenant-related services for its sole general partner, Mack-Cali Realty Corporation (“the Corporation” or “General Partner”).  The Company, through its operating divisions and subsidiaries, including the Mack-Cali property-owning partnerships and limited liability companies (collectively, the “Property Partnerships”) is the entity through which all of the General Partner’s operations are conducted.
	The General Partner is a fully-integrated self-administered, self-managed real estate investment trust (“REIT”). The General Partner controls the Company as its sole general partner and owned an 88.9 percent and 88.1 percent common unit interest in the Company as of September 30, 2014 and December 31, 2013, respectively.
	The General Partner’s business is the ownership of interests in and operation of the Company, and all of the General Partner’s expenses are incurred for the benefit of the Company.  The General Partner is reimbursed by the Company for all expenses it incurs relating to the ownership and operation of the Company.
	As of September 30, 2014, the Company owned or had interests in 282 properties,  consisting of 266 commercial properties, primarily class A office and office/flex properties, totaling approximately 31.5 million square feet, leased to approximately 2,000 commercial tenants, and 16 multi-family rental properties containing 4,940 residential units, plus developable land (collectively, the “Properties”).  The Properties are comprised of 251 buildings, primarily office and office/flex buildings totaling approximately 31.0 million square feet (which include 37 buildings, primarily office buildings aggregating approximately 6.0 million square feet owned by unconsolidated joint ventures in which the Company has investment interests), six industrial/warehouse buildings totaling approximately 387,400 square feet, 16 multi-family properties totaling 4,940 apartments (which include 10 properties aggregating 3,639 apartments owned by unconsolidated joint ventures in which the Company has investment interests), five parking/retail properties totaling approximately 121,500 square feet (which include two buildings aggregating 81,500 square feet owned by unconsolidated joint ventures in which the Company has investment interests), one hotel (which is owned by an unconsolidated joint venture in which the Company has an investment interest) and three parcels of land leased to others.  The Properties are located in seven states, primarily in the Northeast, plus the District of Columbia.
	BASIS OF PRESENTATION
	The accompanying consolidated financial statements include all accounts of the Company, its majority-owned and/or controlled subsidiaries and variable interest entities for which the Company has determined itself to be the primary beneficiary, if any.  See Note 2: Significant Accounting Policies – Investments in Unconsolidated Joint Ventures, for the Company’s treatment of unconsolidated joint venture interests.  Intercompany accounts and transactions have been eliminated.
	Accounting Standards Codification (“ASC”) 810, Consolidation, provides guidance on the identification of entities for which control is achieved through means other than voting rights (“variable interest entities” or “VIEs”) and the determination of which business enterprise, if any, should consolidate the VIEs. Generally, the consideration of whether an entity is a VIE applies when either: (1) the equity investors (if any) lack one or more of the essential characteristics of a controlling financial interest; (2) the equity investment at risk is insufficient to finance that entity’s activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and the activities of the entity involve or are conducted on behalf of an investor with a disproportionately small voting interest.  The Company consolidates VIEs in which it is considered to be the primary beneficiary.  The primary beneficiary is defined by the entity having both of the following characteristics: (1) the power to direct the activities that, when taken together, most significantly impact the variable interest entity’s performance: and (2) the obligation to absorb losses and right to receive the returns from the VIE that would be significant to the VIE.
	As of September 30, 2014 and December 31, 2013, 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 $237.7 million and $219.9 million, respectively, mortgages of $90 million and $81.9 million, respectively, and other liabilities of $17 million and $18.3 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_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Significant Accounting Policies [Abstract]	'
Significant Accounting Policies	'
	2.SIGNIFICANT ACCOUNTING POLICIES
	Rental
	PropertyRental properties are stated at cost less accumulated depreciation and amortization.  Costs directly related to the acquisition, development and construction of rental properties are capitalized.  Acquisition‑related costs are expensed as incurred.  Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development.  Capitalized development and construction salaries and related costs approximated $1.0 million and $1.9 million for the three months ended September 30, 2014 and 2013, respectively, and $2.7 million and $3.7 million for the nine months ended September 30, 2014 and 2013, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $58.8 million and $40.8 million as of September 30, 2014 and December 31, 2013, respectively.  Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.  Fully-depreciated assets are removed from the accounts.
	The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of tenant improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup).  If portions of a rental project are substantially completed and occupied by tenants, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project.  The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative square footage of each portion, and capitalizes only those costs associated with the portion under construction.
	Properties are depreciated using the straight-line method over the estimated useful lives of the assets.  The estimated useful lives are as follows:
	Leasehold interests	Remaining lease term
	Buildings and improvements	5 to 40 years
	Tenant improvements	The shorter of the term of the
		related lease or useful life
	Furniture, fixtures and equipment	5 to 10 years
	Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below market leases, (ii) in-place leases and (iii) tenant relationships.  The Company allocates the purchase price to the assets acquired and liabilities assumed based on their fair values.  The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed exceed the purchase consideration of a transaction.  In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information.  The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant.
	Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases.
	Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant.  Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases.  In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions.  In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses.  Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals.  The value of in-place leases are amortized to expense over the remaining initial terms of the respective leases.  The value of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired.  In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment.  The criteria considered by management include reviewing low leased percentages, significant near-term lease expirations, recently acquired properties, current and historical operating and/or cash flow losses, near-term mortgage debt maturities or other factors that might impact the Company’s intent and ability to hold the property.  A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property is less than the carrying value of the property.  To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the property over the fair value of the property.  The Company’s estimates of aggregate future cash flows expected to be generated by each property are based on a number of assumptions.  These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions.  The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and costs to operate each property.  As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future.
	Rental Property
	Held for Sale When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of selling costs, of such assets.  If, in management’s opinion, the estimated net sales price of the assets which have been identified as held for sale is less than the net book value of the assets, a valuation allowance is established.
	If circumstances arise that previously were considered unlikely and, as a result, the Company decides not to sell a property previously classified as held for sale, the property is reclassified as held and used.  A property that is reclassified is measured and recorded individually at the lower of (a) its carrying amount before the property was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the property been continuously classified as held and used, or (b) the fair value at the date of the subsequent decision not to sell.
	Investments in
	Unconsolidated
	Joint VenturesThe Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting.  The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions.  The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed.  Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee.  If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired.  An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary.  To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the value of the investment.  The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs.  As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future.  See Note 4: Investments in Unconsolidated Joint Ventures.
	Cash and Cash
	EquivalentsAll highly liquid investments with a maturity of three months or less when purchased are considered to be cash equivalents.
	Deferred
	Financing CostsCosts 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 $778,000 and $954,000 for the three months ended September 30, 2014 and 2013, respectively,  $2,306,000 and $2,379,000 for the nine months ended September 30, 2014 and 2013, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (loss) from early extinguishment of debt.
	Deferred
	Leasing CostsCosts incurred in connection with commercial leases are capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization.  Unamortized deferred leasing costs are charged to amortization expense upon early termination of the lease. Certain employees of the Corporation are compensated for providing leasing services to the Properties.  The portion of such compensation related to commercial leases, which is capitalized and amortized, approximated  $940,000 and  $962,000 for the three months ended September 30, 2014 and 2013,  respectively, and $2,816,000 and $3,168,000 for the nine months ended September 30, 2014 and 2013, respectively.
	GoodwillGoodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable.  Each of the Company’s segments consists of a reporting unit.  Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable.  In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount.  If based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying amount, then performing the additional two-step impairment test is unnecessary. If the carrying amount of goodwill exceeds its fair value, an impairment charge is recognized.
	Derivative
	InstrumentsThe 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
	RecognitionBase 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 16: Tenant Leases.
	Construction services revenue includes fees earned and reimbursements received by the Company for providing construction management and general contractor services to clients.  Construction services revenue is recognized on the percentage of completion method.  Using this method, profits are recorded on the basis of our estimates of the overall profit and percentage of completion of individual contracts.  A portion of the estimated profits is accrued based upon estimates of the percentage of completion of the construction contract.  This revenue recognition method involves inherent risks relating to profit and cost estimates.
	Real estate services revenue includes property management, development 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.
	In May 2014, the Financial Accounting Standards Board (“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, 2016, and early adoption is not permitted.  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.
	Allowance for
	Doubtful AccountsManagement 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 TaxesThe Company is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns.  Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements.
	Certain of the Company’s corporate subsidiaries are taxable REIT subsidiaries (each a “TRS”).  In general, a TRS may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated).  A TRS is subject to corporate federal income tax.  The Company has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters.  As of September 30, 2014, the Company had a deferred tax asset with a balance of approximately  $14.1 million which has been fully reserved for through a valuation allowance.  If the Corporation fails to qualify as a REIT in any taxable year, the Corporation will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates.  The Corporation is subject to certain state and local taxes.
	Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment.  The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense.
	In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable.  As of September 30, 2014, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2009 forward.
	Earnings
	Per UnitThe Company presents both basic and diluted earnings per unit (“EPU”).  Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period.  Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount from continuing operations amount.  Units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable units included in diluted EPU shall be based on the number of units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable units shall be included in the denominator of diluted EPU as of the beginning of the period (or as of the date of the grant, if later).
	Distributions
	PayableThe distributions payable at September 30, 2014 represents distributions payable to common unitholders (99,907,400 units) for all such holders of record as of October 3, 2014 with respect to the third quarter 2014.  The third quarter 2014 common unit distributions of $0.15 per common unit were approved by the Corporation’s Board of Directors on September 11, 2014.  The common unit distributions payable were paid on October 10, 2014.
	The distributions payable at December 31, 2013 represents distributions payable to common unitholders (99,792,777 units), for all such holders of record as of January 6, 2014 with respect to the fourth quarter 2013.  The fourth quarter 2013 common unit distributions of $0.30 per common unit were approved by the Corporation’s Board of Directors on December 10, 2013.  The common unit distributions payable were paid on January 15, 2014.
	Costs Incurred
	For Stock
	IssuancesCosts incurred in connection with the Corporation’s stock issuances are reflected as a reduction of General Partner’s capital.
	Stock
	CompensationThe 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”), TSR-based Performance Shares and stock options at the grant date be amortized ratably into expense over the appropriate vesting period.  The Company recorded stock compensation expense of $830,000 and $641,000 for the three months ended September 30, 2014 and 2013, respectively, and $5,094,000 (which includes $3,150,000 related to the departure of executive vice presidents.  See Note 15: Commitments and Contingencies – Departure of Executive Vice Presidents); and $1,947,000 for the nine months ended September 30, 2014 and 2013, respectively.
	Other
	Comprehensive
	IncomeOther comprehensive income (loss) 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, 2014 and 2013, and no accumulated other comprehensive income as of September 30, 2014 and December 31, 2013.
	Fair Value
	HierarchyThe 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 inactive 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 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 will be effective 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 may early adopt the guidance for new disposals (or new classifications as held for sale) that have not been reported in financial statements previously issued or available for issuance.    The Company has 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.  See Note 7: Discontinued Operations.

Real_Estate_Transactions

Real Estate Transactions	9 Months Ended
	Sep. 30, 2014
Real Estate Transactions [Abstract]	'
Real Estate Transactions	'
	3.REAL ESTATE TRANSACTIONS
	Acquisitions
	On April 10, 2014, the Company acquired Andover Place, a 220-unit multi-family rental property located in Andover, Massachusetts, for approximately $37.7 million, which was funded primarily through borrowing under the Company’s unsecured revolving credit facility.
	The purchase price was allocated to the net assets acquired, as follows (in thousands):
			Andover
			Place
	Land	$	8,535
	Buildings and improvements		27,609
	Furniture, fixtures and equipment		459
	In-place lease values (1)		1,118
			37,721
	Less: Below market lease values (1)		-25
	Net cash paid at acquisition	$	37,696
	(1) In-place lease values and below market lease values will be amortized over one year or less.
	On August 15, 2014, the Company acquired the equity interests of its joint venture partner in Overlook Ridge, L.L.C, Overlook Ridge JV, L.L.C. and Overlook Ridge JV 2C/3B, L.L.C. for $16.6 million, which was funded primarily through borrowing under the Company’s unsecured revolving credit facility.  As a result, the Company increased its ownership to 100 percent of the developable land and now consolidates these entities which were previously accounted for through unconsolidated joint ventures (collectively, the “Consolidated Land”); and acquired an additional 25 percent, for a total of 50 percent of its subordinated, unconsolidated interests in two operating multi-family properties owned by those entities.  See Note 4: Investments in Unconsolidated Joint Ventures.  In conjunction with the Company’s acquisition of the Consolidated Land, the Company assumed loans with a total principal balance of $22.8 million, which bear interest in the range of LIBOR plus 2.50 to 3.50 percent.  See Note 10: Mortgages, Loans Payable and Other Obligations.
	For the nine months ended September 30, 2014, included in general and administrative expense was an aggregate of approximately $1.9 million in transactions costs related to the Company’s property and joint venture acquisitions.
	Excluded from the cash flow statement for the nine months ended September 30, 2014 was $44.4 million of acquisition and other investment fundings (of which $40.1 million related to the acquisition of 50 percent tenants in common interests in the Curtis Center property.  See Recent Transactions in Note 4: Investments in Unconsolidated Joint Ventures), which were handled through a qualified intermediary using proceeds from prior sales structured for tax purposes as Section 1031 transactions.
	Sales
	The Company sold the following office properties during the nine months ended September 30, 2014 (dollars in thousands):
					Rentable			Net			Net
	Sale			# of	Square			Sales			Book			Realized
	Date	Property/Address	Location	Bldgs.	Feet			Proceeds			Value			Gain
	4/23/14	22 Sylvan Way	Parsippany, New Jersey	1	249,409		$	94,897		$	60,244		$	34,653
	6/23/14	30 Knightsbridge Road (a)	Piscataway, New Jersey	4	680,350			54,641			52,361			2,280
	6/23/14	470 Chestnut Ridge Road (a) (b)	Woodcliff Lake, New Jersey	1	52,500			7,195			7,109			86
	6/23/14	530 Chestnut Ridge Road (a) (b)	Woodcliff Lake, New Jersey	1	57,204			6,299			6,235			64
	6/27/14	400 Rella Boulevard	Suffern, New York	1	180,000			27,539			10,938			16,601
	6/30/14	412 Mount Kemble Avenue (a)	Morris Township, New Jersey	1	475,100			44,751			43,851			900
	7/29/14	17-17 Route 208 North (a) (b)	Fair Lawn, New Jersey	1	143,000			11,835			11,731			104
	8/20/14	555, 565, 570 Taxter Road (a)	Elmsford, New York	3	416,108			41,057			41,057			-
	8/20/14	200, 220 White Plains Road (a)	Tarrytown, New York	2	178,000			12,619			12,619			-
	8/20/14	1266 East Main Street (a) (b)	Stamford, Connecticut	1	179,260			18,406			18,246			160
	Totals:			16	2,610,931		$	319,239		$	264,391		$	54,848
	(a)The Company completed the sale of these properties for approximately $221 million comprised of: $192.5 million in cash from a combination of affiliates of Keystone Property Group (“Keystone Entities”) senior and pari-passu equity and mortgage financing; Company subordinated equity interests in each of the properties sold with capital accounts aggregating $21.2 million and Company pari-passu equity interests in five of the properties sold aggregating $7.3 million.  Net sale proceeds from the sale aggregated $196.8 million which was comprised of the $221 million gross sales price less the subordinated equity interests of $21.2 million and $3 million in closing costs.  The purchasers of these properties are unconsolidated joint ventures formed between the Company and the Keystone Entities.  The senior and pari-passu equity will receive a 15 percent internal rate of return (“IRR”) after which the subordinated equity will receive a 10 percent IRR and then all distributable cash flow will be split equally between the Keystone Entities and the Company.  See Note 4: Investments in Unconsolidated Joint Ventures.  In connection with certain of these partial sale transactions, because the buyer received a preferential return on certain of the ventures for which the Company received subordinated equity interests, the Company only recognized profit to the extent that they received net proceeds in excess of their entire carrying value of the properties, effectively reflecting their retained subordinated equity interest at zero.
	(b)The Company recorded an impairment charge of $20.7 million on these properties at December 31, 2013 as it estimated that the carrying value of the properties may not be recoverable over their anticipated holding periods.
	On January 1, 2014, the Company early adopted the new discontinued operations accounting standard and as the properties sold in the nine months ended September 30, 2014 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 from the properties sold during the nine months ended September 30, 2014 for the three and nine months ended September 30, 2014 and 2013: (dollars in thousands)  See Note 7: Discontinued Operations for properties sold in 2013.
				Three Months Ended						Nine Months Ended
				September 30,						September 30,
				2014			2013			2014			2013
	Total revenues		$	2,763		$	13,672		$	28,824		$	41,965
	Operating and other expenses			-1,957			-7,368			-17,248			-20,681
	Depreciation and amortization			-502			-3,600			-6,371			-10,945
	Interest income			2			-			4			-
	Income from properties sold		$	306		$	2,704		$	5,209		$	10,339

Investments_In_Unconsolidated_

Investments In Unconsolidated Joint Ventures	9 Months Ended
	Sep. 30, 2014
Investments In Unconsolidated Joint Ventures [Abstract]	'
Investments In Unconsolidated Joint Ventures	'
	4.INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES
	As of September 30, 2014, the Company had an aggregate investment of approximately $239.8 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, 2014, the unconsolidated joint ventures owned: 36 office and two retail properties aggregating approximately 5.7 million square feet, 10 multi-family properties totaling 3,639 apartments, a 350-room hotel,  development projects for up to approximately 2,275 apartments; and interests and/or rights to developable land parcels able to accommodate up to 2,994 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, 2014, such debt had a total facility amount of $287.9 million of which the Company agreed to guarantee up to $71.5 million.  As of September 30, 2014, the outstanding balance of such debt totaled $215.5 million of which $62.6 million was guaranteed by the Company.  The Company also posted a $4.1 million letter of credit in support of the South Pier at Harborside joint venture, half of which is indemnified by Hyatt Corporation, the Company’s joint venture partner.  The Company performed management, leasing, development and other services for the properties owned by the unconsolidated joint ventures and recognized $1.9 million and $1.7 million for such services in the three months ended September 30, 2014 and 2013, respectively, and $5.1 million and $4.2 million for the nine months ended September 30, 2014 and 2013, respectively.  The Company had $899,000 and $523,000 in accounts receivable due from its unconsolidated joint ventures as of September 30, 2014 and December 31, 2013.
	Included in the Company’s investments in unconsolidated joint ventures as of September 30, 2014 are eight 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 $96.7 million as of September 30, 2014.  The Company’s maximum exposure to loss as a result of its involvement with these VIEs is estimated to be approximately $207.4 million, which includes the Company’s current investment and estimated future funding commitments/guarantees of approximately $110.7 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, 2014:  (dollars in thousands)
		Number of		Company's				Company's			Property Debt
		Apartment Units		Effective				Carrying				Maturity	Interest
	Entity / Property Name	or Square Feet (sf)		Ownership % (a)				Amount			Balance	Date	Rate
	Multi-family
	Marbella RoseGarden, L.L.C./ Marbella  (b)	412	units	24.27	%		$	15,784		$	95,000	5/1/18	4.99	%
	RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)  (b)	523	units	15.00	%			2,438			165,000	2/1/21	4.19	%
	Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station  (b)	217	units	25.00	%			275			38,846	7/1/15	4.00	%
	PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial (b)	236	units	50.00	%			-			57,500	9/1/20	4.32	%
	Rosewood Morristown, L.L.C. / Metropolitan at 40 Park  (c) (d)	130	units	12.50	%			6,127			46,217	(e)	(e)
	Overlook Ridge JV, L.L.C./ Quarrystone  (b) (f)	251	units	50.00	%			-			69,580	(g)	(g)
	Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B  (b) (f)	371	units	50.00	%			2,753			47,872	12/26/15	L+2.50	%	(h)
	PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial   (b)	316	units	25.00	%			1,332			79,053	7/15/21	6.00	%	(i)
	Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)  (b)	355	units	7.50	%			-			79,266	6/27/16	L+2.10	%	(j)
	Crystal House Apartments Investors LLC / Crystal House  (k)	828	units	25.00	%			26,602			165,000	4/1/20	3.17	%
	Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7  (b)	176	units	38.25	%			2,306			32,693	12/4/15	L+2.50	%	(l)
	PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13  (b)	280	units	20.00	%			1,402			37,355	6/27/16	L+2.15	%	(m)
	Roseland/Port Imperial Partners, L.P./ Riverwalk C  (b) (n)	363	units	20.00	%			1,849			-	-	-
	RoseGarden Marbella South, L.L.C./ Marbella II	311	units	24.27	%			9,612			19,626	3/30/17	L+2.25	%	(o)
	Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)  (b)	227	units	7.50	%			-			30,830	1/25/17	L+2.10	%	(p)
	Riverpark at Harrison I, L.L.C./ Riverpark at Harrison	141	units	36.00	%			4,556			17,446	6/27/16	L+2.35	%	(q)
	Capitol Place Mezz LLC / Station Townhouses	377	units	50.00	%			48,682			55,414	7/1/33	4.82	%	(r)
	Harborside Unit A Urban Renewal, L.L.C. / URL Harborside  (ab)	763	units	85.00	%			28,080			-	8/1/29	5.197	%	(aa)
	RoseGarden Monaco, L.L.C./ San Remo Land	300	potential units	41.67	%			1,269			-	-	-
	Grand Jersey Waterfront URA, L.L.C./ Liberty Landing	1,000	potential units	50.00	%			337			-	-	-
	Office
	Red Bank Corporate Plaza, L.L.C./ Red Bank	92,878	sf	50.00	%			3,880			16,054	5/17/16	L+3.00	%	(s)
	12 Vreeland Associates, L.L.C./ 12 Vreeland Road	139,750	sf	50.00	%			5,680			14,124	7/1/23	2.87	%
	BNES Associates III / Offices at Crystal Lake	106,345	sf	31.25	%			2,026			6,907	11/1/23	4.76	%
	Hillsborough 206 Holdings, L.L.C./ Hillsborough 206	160,000	sf	50.00	%			1,962			-	-	-
	KPG-P 100 IMW JV, LLC / 100 Independence Mall West	339,615	sf	33.33	%			339			61,500	9/9/16	L+7.00	%	(t)
	Keystone-Penn	1,842,820	sf	(u)				-			201,606	(v)	(v)
	Keystone-TriState	1,266,384	sf	(w)				5,725			204,548	(x)	(x)
	KPG-MCG Curtis JV, L.L.C./ Curtis Center  (ac)	885,000	sf	50.00	%			60,440			(ae)	(ae)	(ae)
	Other
	Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)	1,225,000	sf	50.00	%			3,922			-	-	-
	Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial  (b)	30,745	sf	20.00	%			1,849			-	-	-
	South Pier at Harborside / Hyatt Regency Jersey City on the Hudson	350	rooms	50.00	%			-			65,974	(y)	(y)
	Stamford SM LLC / Senior Mezzanine Loan  (z)	n/a	n/a	80.00	%			-			-	-	-
	Other (ad)							540			-	-	-
	Totals:						$	239,767		$	1,607,411
		(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)		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").
		(d)		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, 2014), and is not expected to meaningfully participate in the venture's cash flows in the near term.
		(e)		Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600 at September 30, 2014, bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500 at September 30, 2014, bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117, bears interest at LIBOR plus 250 basis points and matures in September 2015.  The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved.
		(f)		On August 15, 2014, the Company acquired the equity interests of its joint venture partner in Overlook Ridge JV 2C/3B, L.L.C. for $2.97 million and LR Overlook Phase II, L.L.C., the property-owning entity owned by Overlook Ridge JV, L.L.C., which increased its ownership to 50 percent in two  operating multi-family properties.  The Company also acquired the equity interests of its joint venture partner in LR Overlook Phase III, L.L.C. and  Overlook Ridge, L.L.C. for $0.6 million and $12.99 million respectively, which increased its ownership to 100 percent in developable land (See Note 3: Real Estate Transactions – Acquisitions).
		(g)		Property debt balance consists of: (i) the senior loan, collateralized by the Quarrystone property, with a balance of $52,580 at September 30, 2014, bears interest at LIBOR plus 200 basis, matures in March 2016   and (ii) the junior loan, with a balance of $17,000, bears interest at LIBOR plus 90 basis points, matures in March 2016 and is collateralized by a $17,000 letter of credit provided by an affiliate of the partner.
		(h)		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.
		(i)		The construction loan has a maximum borrowing amount of $83,113.
		(j)		The construction loan has a maximum borrowing amount of $91,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.
		(k)		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.
		(l)		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.
		(m)		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.
		(n)		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.
		(o)		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.
		(p)		The construction loan has a maximum borrowing amount of $57,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.
	(q)		The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one-year extension options with a fee of 20 basis points for each year.
	(r)		The construction/permanent  loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017.
	(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 reserve with a balance of $16.8 million at September 30, 2014.
	(u)		The Company’s equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.
	(v)		Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $63,581 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 $6.5 million in five properties and Company’s subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally (See Note 3: Real Estate Transactions – Sales).
	(x)		Principal balance of $41,240 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $70,608 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)		Balance includes: (i) mortgage loan, collateralized by the hotel property, with  a balance of $61,850, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $4.1 million, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020.  The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner.
	(z)		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.
	(aa)		The construction/permanent loan has a maximum borrowing amount of $192,000.
(ab)See discussion in Recent Transactions following in this footnote.
(ac)Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12.  See discussion in Recent Transactions following in this footnote.
(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.
(ae) See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.
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, 2014 and December 31, 2013: (dollars in thousands)
			September 30,			December 31,
			2014			2013
Assets:
Rental property, net		$	1,404,929		$	755,049
Loan receivable			-			45,050
Other assets			445,127			582,990
Total assets		$	1,850,056		$	1,383,089
Liabilities and partners'/
members' capital:
Mortgages and loans payable		$	992,434		$	637,709
Other liabilities			221,414			87,231
Partners'/members' capital			636,208			658,149
Total liabilities and
partners'/members' capital		$	1,850,056		$	1,383,089
The following is a summary of the Company’s investments in unconsolidated joint ventures as of September 30, 2014 and December 31, 2013:  (dollars in thousands)
		September 30,			December 31,
Entity / Property Name		2014			2013
Multi-family
Marbella RoseGarden, L.L.C./ Marbella	$	15,784		$	15,797
RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)		2,438			3,201
Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station		275			857
PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial		-			-
Rosewood Morristown, L.L.C. / Metropolitan at 40 Park		6,127			6,455
Overlook Ridge JV, L.L.C./ Quarrystone		-			-
Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B		2,753			-
PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial		1,332			3,117
Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)		-			203
Crystal House Apartments Investors LLC / Crystal House		26,602			26,838
Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7		2,306			3,207
PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13		1,402			2,206
Roseland/Port Imperial Partners, L.P./ Riverwalk C		1,849			2,068
RoseGarden Marbella South, L.L.C./ Marbella II		9,612			7,567
Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)		-			24
Riverpark at Harrison I, L.L.C./ Riverpark at Harrison		4,556			3,655
Capitol Place Mezz LLC / Station Townhouses		48,682			46,628
Harborside Unit A Urban Renewal, L.L.C. / URL Harborside		28,080			-
RoseGarden Monaco, L.L.C./ San Remo Land		1,269			1,224
Grand Jersey Waterfront URA, L.L.C./ Liberty Landing		337			337
Office
Red Bank Corporate Plaza, L.L.C./ Red Bank		3,880			4,046
12 Vreeland Associates, L.L.C./ 12 Vreeland Road		5,680			5,514
BNES Associates III / Offices at Crystal Lake		2,026			1,753
Hillsborough 206 Holdings, L.L.C./ Hillsborough 206		1,962			1,962
KPG-P 100 IMW JV, LLC / 100 Independence Mall West		339			1,887
Keystone-Penn		-			-
Keystone-TriState		5,725			-
KPG-MCG Curtis JV, L.L.C. / Curtis Center		60,440			-
Other
Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)		3,922			3,702
Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial		1,849			1,930
South Pier at Harborside / Hyatt Regency Jersey City on the Hudson (a)		-			-
Stamford SM LLC / Senior Mezzanine Loan		-			36,258
Other		540			693
Company's investment in unconsolidated joint ventures	$	239,767		$	181,129
	(a)		The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.
The following is a summary of the results from operations of the unconsolidated joint ventures for the period in which the Company had investment interests during the three and nine months ended September 30, 2014 and 2013: (dollars in thousands)
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
Total revenues	$	80,711		$	99,117		$	224,822		$	202,810
Operating and other expenses		-58,684			-48,621			-173,642			-137,889
Depreciation and amortization		-15,134			-11,556			-31,715			-24,730
Interest expense		-11,296			-3,934			-26,423			-9,256
Net income (loss)	$	-4,403		$	35,006		$	-6,958		$	30,935
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, 2014 and 2013: (dollars in thousands)
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
Entity / Property Name		2014			2013			2014			2013
Multi-family
Marbella RoseGarden, L.L.C./ Marbella	$	3		$	-170		$	-13		$	-446
RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)		-249			-416			-764			-1,238
Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station		-221			-295			-639			-869
PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial		-			-			-			-606
Rosewood Morristown, L.L.C. / Metropolitan at 40 Park		-90			-152			-264			-393
Overlook Ridge JV, L.L.C./ Quarrystone		-			-			-			-
Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B		-217			53			-155			204
PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial		-615			-198			-1,766			-576
Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)		-			-87			-203			-255
Crystal House Apartments Investors LLC / Crystal House		68			-1,149			-206			-2,671
Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7		-228			-109			-661			-222
PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13		-220			-181			-638			-459
Roseland/Port Imperial Partners, L.P./ Riverwalk C		-173			-			-518			-
RoseGarden Marbella South, L.L.C./ Marbella II		-			-20			-			-57
Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)		-			-44			-15			-107
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		-			-			-212			-
RoseGarden Monaco, L.L.C./ San Remo Land		-			-			-			-
Grand Jersey Waterfront URA, L.L.C./ Liberty Landing		-			-			-54			-
Office
Red Bank Corporate Plaza, L.L.C./ Red Bank		101			99			306			306
12 Vreeland Associates, L.L.C./ 12 Vreeland Road		22			-25			165			-1
BNES Associates III / Offices at Crystal Lake		127			-37			273			-108
Hillsborough 206 Holdings, L.L.C./ Hillsborough 206		-			-			-5			-
KPG-P 100 IMW JV, LLC / 100 Independence Mall West		-412			-			-1,548			-
Keystone-Penn		-			-			-			-
Keystone-TriState		-733			-			-733			-
KPG-MCG Curtis JV, L.L.C./ Curtis Center		113			-			364			-
Other
Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)		74			24			220			52
Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial		-34			-62			-81			-194
South Pier at Harborside / Hyatt Regency Jersey City on the Hudson		583			835			1,874			1,380
Stamford SM LLC / Senior Mezzanine Loan		493			1,023			2,337			2,805
Other		340			682			876			1,396
Company's equity in earnings (loss) of unconsolidated joint ventures	$	-1,268		$	-229		$	-2,060		$	-2,059
Recent Transactions
Harborside Unit A Urban Renewal, L.L.C.
Pursuant to a developer agreement entered into in December 2011, on May 21, 2014, the Company entered into a joint venture agreement with Ironstate Harborside-A LLC (“ISA”) to form Harborside Unit A Urban Renewal, L.L.C. (“URL-Harborside”), a newly-formed joint venture that will develop, own and operate a high-rise tower of approximately 763 multi-family apartment units above a parking pedestal to be located on land contributed by the Company at its Harborside complex in Jersey City, New Jersey (the “URL Project”).  The construction of the URL Project is estimated to cost a total of approximately $320 million and is projected to be ready for occupancy by the fourth quarter of 2016.   The URL Project has been awarded up to $33 million in future tax credits (“URL Tax Credits”), subject to certain conditions, from the New Jersey Economic Development Authority.  The venture has an agreement to sell these credits, subject to certain conditions.  On August 1, 2014, the venture obtained a construction/permanent loan with a maximum borrowing amount of $192 million (with no balance currently outstanding as of September 30, 2014), which bears interest at a rate of 5.197 percent and matures in August 2029.  The Company currently expects that it will fund approximately $65.6 million of the remaining development costs of the project,  net of the loan financing.
The Company owns an 85 percent interest in URL-Harborside and the remaining interest owned by ISA, with shared control over major decisions such as, approval of budgets, property financings and leasing guidelines.  Upon entering into the joint venture, the Company’s initial contribution was $30.6 million, which included a capital credit of $30 per approved developable square foot for its contributed land aggregating approximately $20.6 million with the balance consisting of previously incurred development costs, and ISA’s initial contribution was approximately $5.4 million.  Included in the Company’s investment in the unconsolidated joint venture is its land contribution with a carrying amount of $5.5 million.  The Company has funded an additional $12.6 million in development costs for the venture through September 30, 2014.
In general, the operating agreement of URL-Harborside provides that net operating cash flows are distributed first, to the members in respect of preferred return, as defined, until each member shall have received payment of the accrued and unpaid preferred return; and, thereafter, 75 percent to the Company and 25 percent to ISA.
Net cash flows from a capital event are distributed first, to the members in respect of preferred return, as defined, until each member shall have received payment of the accrued and unpaid preferred return; second, to the members pro rata based upon the ratio that their respective capital accounts bear to each other until each member shall have received their respective net capital, as defined; third, to the members at the rate of 75 percent to the Company and 25 percent to ISA until the Company shall have received distributions equal to an 18 percent internal rate of return on the Company’s capital contributions; and, thereafter, to the members, at the rate of 65 percent to the Company and 35 percent to ISA.
KPG-MCG Curtis JV, LLC / Curtis Center
On June 6, 2014, the Company and an affiliate of Keystone Property Group (“KPG”) acquired 50 percent tenants-in-common interests each for $62.5 million in Curtis Center, an 885,000 square foot commercial office property  located at 601 Walnut Street in Philadelphia, Pennsylvania (the “Curtis Center Property”), which amounted to a total purchase of  approximately $125.0 million for the property.  In connection with the transaction, the Company provided short-term loans to KPG affiliates, as follows:  a 90-day, $52.3 million loan which bore interest at an annual rate of 3.5 percent payable at maturity, which was collateralized by the KPG affiliates’ interest in the Curtis Center Property; and a 90-day, $10 million loan which also bore interest at an annual rate of 3.5 percent payable at maturity.  The $10 million loan was repaid in full on September 2, 2014 and the $52.3 million loan was subsequently repaid in full on October 1, 2014.  The investments were funded by the Company primarily through borrowing under its revolving credit facility.  The venture plans to reposition the property into a mixed-use property by converting a portion of existing office space into multi-family rental apartments.
Simultaneous with the acquisition of the Curtis Center Property, the Company and a KPG affiliate formed a new joint venture named KPG-MCG Curtis JV, LLC (the “Curtis Center JV”), which master leased the Curtis Center Property from the acquisition entities for approximately 29 years at market-based terms.  The Company and the KPG affiliate both own a 50 percent interest in the Curtis Center JV, with shared control over major decisions.
In general, the operating agreement of the Curtis Center JV provides that net cash flows from operations and capital events are distributed first, to the members, pro rata in proportion to their unreturned capital contributions, until each member’s unreturned capital contributions have been reduced to zero; and, thereafter, to each member, pro rata, in accordance with their percentage interests.

Deferred_Charges_Goodwill_And_

Deferred Charges, Goodwill And Other Assets	9 Months Ended
	Sep. 30, 2014
Deferred Charges, Goodwill And Other Assets [Abstract]	'
Deferred Charges, Goodwill And Other Assets	'
	5.DEFERRED CHARGES, GOODWILL AND OTHER ASSETS
			September 30,			December 31,
	(dollars in thousands)		2014			2013
	Deferred leasing costs	$	226,605		$	258,648
	Deferred financing costs		24,689			25,366
			251,294			284,014
	Accumulated amortization		-115,620			-131,669
	Deferred charges, net		135,674			152,345
	Notes receivable (1)		73,828			21,986
	In-place lease values, related intangibles and other assets, net		7,566			13,659
	Goodwill		2,945			2,945
	Prepaid expenses and other assets, net (2)		100,383			27,584
	Total deferred charges, goodwill and other assets	$	320,396		$	218,519
		-1		Includes as of September 30, 2014: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent; a note receivable for $7.8 million which bears interest at eight percent; an interest-free note receivable with a net present value of $3.4 million and a note receivable for $52.3 million which bore interest at 3.5 percent (which was repaid in full on October 1, 2014).
		-2		Includes a receivable of $61.9 million related to the completion of the Curtis Center mortgage loan financing on September 30, 2014 for which the Company received its loan proceeds on October 1, 2014.  See Note 10: Mortgages, Loans Payable and Other Obligations.

Restricted_Cash

Restricted Cash	9 Months Ended
	Sep. 30, 2014
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,
			2014		2013
	Security deposits	$	7,594	$	8,534
	Escrow and other reserve funds		18,977		11,260
	Total restricted cash	$	26,571	$	19,794

Discontinued_Operations

Discontinued Operations	9 Months Ended
	Sep. 30, 2014
Discontinued Operations [Abstract]	'
Discontinued Operations	'
	7.DISCONTINUED OPERATIONS
	On January 1, 2014, the Company early adopted the new discontinued operations accounting standard and as the properties sold in the nine months ended September 30, 2014 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.  See Note 3: Real Estate Transactions – Sales.
	The Company disposed of 24 office properties located in New York, New Jersey, Pennsylvania and Connecticut aggregating 3 million square feet and three developable land parcels for total net sales proceeds of approximately $390.6 million during the year ended December 31, 2013.  The Company has presented these properties as discontinued operations in its statements of operations for the three and nine months ended September 30, 2013.
	The following table summarizes income from discontinued operations for the three and nine months ended September 30, 2013: (dollars in thousands)
		Three Months Ended		Nine Months Ended
			September 30,	September 30,
			2013		2013
	Total revenues	$	6,405	$	33,610
	Operating and other expenses		-2,472		-13,454
	Depreciation and amortization		-1,769		-8,196
	Interest expense		-		-118
	Income from discontinued operations		2,164		11,842
	Loss from early extinguishment of debt		-		-703
	Impairments (1)		-		-23,851
	Realized gains on disposition of rental property		47,321		84,930
	Realized gains (losses) on disposition
	of rental property and impairments, net		47,321		61,079
	Total discontinued operations	$	49,485	$	72,218
	(1)Represents impairment charges recorded on certain properties prior to their sale.

Senior_Unsecured_Notes

Senior Unsecured Notes	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Senior Unsecured Notes	'
	8.SENIOR UNSECURED NOTES
	A summary of the Company’s senior unsecured notes as of September 30, 2014 and December 31, 2013 is as follows: (dollars in thousands)
			September 30,		December 31,	Effective
			2014		2013	Rate (1)
	5.125% Senior Unsecured Notes, due February 15, 2014 (2)		-	$	200,030	5.110	%
	5.125% Senior Unsecured Notes, due January 15, 2015	$	149,971		149,902	5.297	%
	5.800% Senior Unsecured Notes, due January 15, 2016		200,104		200,161	5.806	%
	2.500% Senior Unsecured Notes, due  December 15, 2017		249,077		248,855	2.803	%
	7.750% Senior Unsecured Notes, due August 15, 2019		248,959		248,799	8.017	%
	4.500% Senior Unsecured Notes, due April 18, 2022		299,550		299,505	4.612	%
	3.150% Senior Unsecured Notes, due May 15, 2023		269,778		269,323	3.517	%
	Total senior unsecured notes	$	1,417,439	$	1,616,575
	(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.
	(2)On February 17, 2014, the Company repaid these notes at their maturity using available cash and borrowings on the Company’s unsecured revolving credit facility.
	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 as of September 30, 2014.

Unsecured_Revolving_Credit_Fac

Unsecured Revolving Credit Facility	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Unsecured Revolving Credit Facility	'
	9.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	170.0	35.0
	BBB- or Baa3	130.0	30.0
	BBB or Baa2(current)	110.0	20.0
	BBB+ or Baa1	100.0	15.0
	A- or A3 or higher	92.5	12.5
	The facility has a competitive bid feature, which allows the Company to solicit bids from lenders under the facility to borrow up to $300 million at interest rates less than those above.
	The terms of the unsecured facility include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the facility described below, or (ii) the property dispositions are completed while the Company is under an event of default under the facility, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).  If an event of default has occurred and is continuing, the Corporation will not make any excess distributions except to enable the Corporation to continue to qualify as a REIT under the Code.  The Company was in compliance with its debt covenants as of September 30, 2014.
	The lending group for the credit facility consists of: JPMorgan Chase Bank, N.A., as administrative agent; Bank of America, N.A.,  as syndication agent; Deutsche Bank AG New York Branch; U.S. Bank National Association and Wells Fargo Bank, N.A., as documentation agents; Capital One, National Association; Citibank N.A.; Comerica Bank; PNC Bank, National Association; SunTrust Bank; The Bank of Tokyo-Mitsubishi UFJ, LTD.; The Bank of New York Mellon; as managing agents; and Compass Bank; Branch Banking and Trust Company; TD Bank, N.A.; Citizens Bank of Pennsylvania; Mega International Commercial Bank Co., LTD.  New York Branch, as participants.
	As of September 30, 2014 and December 31, 2013, the Company had no outstanding borrowings under its unsecured revolving credit facility.
	Through July 15, 2013, the Company had a $600 million unsecured revolving credit facility, which had an interest rate on outstanding borrowings of LIBOR plus 125 basis points and a facility fee of 25 basis points.
	MONEY MARKET LOAN
	The Company has an agreement with JPMorgan Chase Bank to participate in a noncommitted money market loan program (“Money Market Loan”).  The Money Market Loan is an unsecured borrowing of up to $75 million arranged by JPMorgan Chase Bank with maturities of 30 days or less.  The rate of interest on the Money Market Loan borrowing is set at the time of each borrowing.  As of September 30, 2014 and December 31, 2013, the Company had no outstanding borrowings under the Money Market Loan.

Mortgages_Loans_Payable_And_Ot

Mortgages, Loans Payable And Other Obligations	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Mortgages, Loans Payable And Other Obligations	'
	10.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, 2014,  30 of the Company’s properties, with a total book value of approximately $982 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 as of September 30, 2014.
	A summary of the Company’s mortgages, loans payable and other obligations as of September 30, 2014 and December 31, 2013 is as follows: (dollars in thousands)
				Effective				September 30,			December 31,
	Property Name	Lender		Rate (a)				2014			2013	Maturity
	6301 Ivy Lane (b)	RGA Reinsurance Company		5.520	%		$	-		$	5,447	-
	395 West Passaic (c)	State Farm Life Insurance Co.		6.004	%			-			9,719	-
	35 Waterview Boulevard (d)	Wells Fargo CMBS		6.348	%			-			18,417	-
	233 Canoe Brook Road (e)	The Provident Bank		4.375	%			-			3,877	-
	6 Becker, 85 Livingston,	Wells Fargo CMBS		10.220	%			65,035			64,233	8/11/14	(o)
	75 Livingston &
	20 Waterview (f)
	4 Sylvan	Wells Fargo CMBS		10.190	%			14,575			14,538	8/11/14	(o)
	10 Independence (g)	Wells Fargo CMBS		12.440	%			16,924			16,638	8/11/14	(g)
	Port Imperial South 4/5	Wells Fargo Bank N.A.	LIBOR+3.50		%			36,950			36,950	10/31/14	(q)
	Overlook - Site IIID,IIIC, IIIA (p)	Wells Fargo Bank N.A.	LIBOR+3.50		%			17,100			-	3/2/15
	Overlook - Site IIB (Quarrystone I) (p)	Wells Fargo Bank N.A.	LIBOR+2.50		%			5,748			-	4/14/15
	9200 Edmonston Road (h)	Principal Commercial Funding L.L.C.		5.534	%			3,996			4,115	5/1/15
	Port Imperial South	Wells Fargo Bank N.A.	LIBOR+1.75		%			43,910			43,278	9/19/15
	4 Becker	Wells Fargo CMBS		9.550	%			39,268			38,820	5/11/16
	5 Becker (i)	Wells Fargo CMBS		12.830	%			13,666			13,092	5/11/16
	210 Clay	Wells Fargo CMBS		13.420	%			13,182			12,767	5/11/16
	Curtis Center (j)	CCRE & PREFG	LIBOR+4.55		%	(m)		64,000			-	10/9/16
	Various (k)	Prudential Insurance		6.332	%			146,048			147,477	1/15/17
	150 Main St.	Webster Bank	LIBOR+2.35		%			218			-	3/30/17
	23 Main Street	JPMorgan CMBS		5.587	%			29,373			29,843	9/1/18
	Harborside Plaza 5	The Northwestern Mutual Life		6.842	%			222,480			225,139	11/1/18
		Insurance Co. & New York Life
		Insurance Co.
	100 Walnut Avenue	Guardian Life Insurance Co.		7.311	%			18,606			18,792	2/1/19
	One River Center (l)	Guardian Life Insurance Co.		7.311	%			42,623			43,049	2/1/19
	Park Square	Wells Fargo Bank N.A.	LIBOR+1.75		%	(n)		27,500			-	4/10/19
	Total mortgages, loans payable and other obligations						$	821,202		$	746,191
		(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 April 1, 2014, the Company repaid the mortgage loan at par, using available cash.
		(c)		On May 1, 2014, the Company repaid the mortgage loan at par, using available cash.
		(d)		On May 12, 2014, the Company repaid the mortgage loan at par, using borrowings on the Company’s unsecured revolving credit facility.
		(e)		On April 30, 2014, the Company repaid the mortgage loan at par, using available cash.
		(f)		Mortgage is cross collateralized by the four properties.
		(g)		The Company is negotiating a deed-in-lieu of foreclosure in satisfaction of this mortgage loan.
		(h)		The mortgage loan originally matured on May 1, 2013.  The maturity date was extended until May 1, 2015 with the same interest rate.  Excess cash flow, as defined, is being held by the lender for re-leasing costs.  The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity.
		(i)		The cash flow from this property is insufficient to cover operating costs and debt service.  Consequently, the Company notified the lender and suspended debt service payments in August 2013.  The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013.
		(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 3.45 percent at September 30, 2014 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.65 percent at September 30, 2014.  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.  Both loans have LIBOR caps for the period.  The loans provide for three one-year extension options.  As the Curtis Center Property loans closed on September 30, 2014 with the loan proceeds received on October 1, 2014, the Company recorded the loan and a receivable on September 30, 2014.  See Note 5: Deferred Charges, Goodwill and Other Assets.
		(k)		Mortgage is cross collateralized by seven properties.  The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
		(l)		Mortgage is collateralized by the three properties comprising One River Center.
		(m)		Amortization of deferred financing costs adds 1.523 percent to the variable interest rate stated above.
		(n)		Amortization of deferred financing costs adds 0.122 percent to the variable interest rate stated above.
	(o)The Company has begun discussions with the lender regarding the past due maturity of the loans.
	(p)On August 15, 2014, the Company assumed these loans as a result of its acquisition of interests which increased its ownership to 100 percent in certain previously unconsolidated joint ventures which owned developable land.
	(q)The Company is pursuing permanent financing at the maturity of the construction financing in October 2014.
	CASH PAID FOR INTEREST AND INTEREST CAPITALIZED
	Cash paid for interest for the nine months ended September 30, 2014 and 2013 was $92,096,000 and $97,284,000, respectively.  Interest capitalized by the Company for the nine months ended September 30, 2014 and 2013 was $10,650,000 and $10,262,000, respectively (of which these amounts included $3,284,000 and $980,000 for the nine months ended September 30, 2014 and 2013, 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, 2014, the Company’s total indebtedness of $2,238,641,000 (weighted average interest rate of 5.62 percent) was comprised of $195,426,000 of variable rate mortgage debt (weighted average rate of 3.86 percent) and fixed rate debt and other obligations of $2,043,215,000 (weighted average rate of 5.78 percent).
	As of December 31, 2013, the Company’s total indebtedness of $2,362,766,000 (weighted average interest rate of 5.62 percent) was comprised of $80,228,000 of variable rate mortgage debt (weighted average rate of 2.74 percent) and fixed rate debt and other obligations of $2,282,538,000 (weighted average rate of 5.72 percent).
	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, 2014 (dollars in thousands):
			Notional			Strike			Effective		Expiration
			Value	(a)		Rate			Date		Date		Fair Value
	LIBOR Cap	$	51,000			1.5	%		Sep-14		Oct-15	$	4
	LIBOR Cap		24,000			1.5	%		Sep-14		Oct-15		2
	LIBOR Cap		51,000			1.75	%		Oct-15		Oct-16		115
	LIBOR Cap		24,000			1.75	%		Oct-15		Oct-16		53
											$	174
	(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.

MackCali_Realty_LPs_Partners_C

Mack-Cali Realty, L.P's Partners' Capital	9 Months Ended
	Sep. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'
Mack-Cali Realty, L.P's Partners' Capital	'
	11.MACK-CALI REALTY, L.P.’S PARTNERS’ CAPITAL
	Partners’ Capital in the accompanying consolidated financial statements relates to (a) General Partners’ capital consisting of common units in the Company held by the General Partner, and (b) Limited Partners’ capital consisting of common units held by the limited partners.
	Any transactions resulting in the issuance of additional common and preferred stock of the Corporation result in a corresponding issuance by the Company of an equivalent amount of common and preferred units to the Corporation.
	GENERAL PARTNERS’ CAPITAL
	REPURCHASE OF GENERAL PARTNER UNITS
	In September 2012, the Corporation’s Board of Directors renewed and authorized an increase to the Corporation’s repurchase program (“Repurchase Program”).  The Corporation has authorization to repurchase up to $150 million of its outstanding common stock under the renewed Repurchase Program, which it may repurchase from time to time in open market transactions at prevailing prices or through privately negotiated transactions.  The Corporation has purchased and retired 394,625 shares of its outstanding common stock for an aggregate cost of approximately $11 million through September 30, 2014 (none of which occurred in the nine months ended September 30, 2014 and the year ended December 31, 2013), with a remaining authorization under the Repurchase Program of $139 million.  Concurrent with these purchases, the Corporation sold to the Company 394,625 common units for approximately $11 million.
	DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN
	The Corporation has a Dividend Reinvestment and Stock Purchase Plan (the “DRIP”) which commenced in March 1999 under which approximately 5.5 million shares of the Corporation’s common stock have been reserved for future issuance.  The DRIP provides for automatic reinvestment of all or a portion of a participant’s dividends from the Corporation’s shares of common stock.  The DRIP also permits participants to make optional cash investments up to $5,000 a month without restriction and, if the Corporation waives this limit, for additional amounts subject to certain restrictions and other conditions set forth in the DRIP prospectus filed as part of the Corporation’s effective registration statement on Form S-3 filed with the SEC for the approximately 5.5 million shares of the Corporation’s common stock reserved for issuance under the DRIP.
	STOCK OPTION PLANS
	In May 2013, the Corporation established the 2013 Incentive Stock Plan (the “2013 Plan”) under which a total of 4,600,000 shares have been reserved for issuance. In May 2004, the Corporation established the 2004 Incentive Stock Plan (the “2004 Plan”) under which a total of 2,500,000 shares had been reserved for issuance.  The 2004 Plan was terminated upon establishment of the 2013 Plan.  No options were granted under the 2004 Plan.  In September 2000, the Corporation established the 2000 Employee Stock Option Plan (“2000 Employee Plan”) and the Amended and Restated 2000 Director Stock Option Plan (“2000 Director Plan” and together with the 2000 Employee Plan, the “2000 Plans”).  In May 2002, shareholders of the Corporation approved amendments to both of the 2000 Plans to increase the total shares reserved for issuance under both of the 2000 Plans from 2,700,000 to 4,350,000 shares of the Corporation’s common stock (from 2,500,000 to 4,000,000 shares under the 2000 Employee Plan and from 200,000 to 350,000 shares under the 2000 Director Plan).  As the 2000 Plans expired in 2010, stock options may no longer be issued under those plans.  Stock options granted under the 2000 Employee Plan became exercisable over a five-year period.  All stock options granted under the 2000 Director Plan became exercisable in one year.  All options were granted at the fair market value at the dates of grant and have terms of 10 years.  As of September 30, 2014 and December 31, 2013, the stock options outstanding, had a weighted average remaining contractual life of approximately 5.2 and 0.7 years, respectively.
	Information regarding the Corporation’s stock option plans is summarized below:
					Weighted			Aggregate
					Average			Intrinsic
		Shares			Exercise			Value
		Under Options			Price			$(000’s)
	Outstanding at January 1, 2014	15,000		$	40.54		$	-
	Granted	5,000			21.25
	Lapsed or Cancelled	-10,000			38.07
	Outstanding at September 30, 2014  ($21.25 – $45.47)	10,000		$	33.36		$	-
	Options exercisable at September 30, 2014	5,000
	Available for grant at September 30, 2014	4,466,143
	The weighted average fair value of options granted during the nine months ended September 30, 2014 was $1.71 per option. The fair value of each option grant is estimated on the date of grant using the Black-Scholes model.  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, 2014:
	Expected life (in years)		6
	Risk-free interest rate		1.50	%
	Volatility		20.26	%
	Dividend yield		5.65	%
	No cash was received from options exercised under all stock option plans for the three and nine months ended September 30, 2014 and 2013, respectively.  The total intrinsic value of options exercised during each of the three and nine months ended September 30, 2014 and 2013 was zero. The Corporation has a policy of issuing new shares to satisfy stock option exercises.
	The Company recognized stock options expense of  $1,000 and zero for the three months ended September 30, 2014 and 2013, respectively, and $3,000 and zero for the nine months ended September 30, 2014 and 2013, respectively.
	RESTRICTED STOCK AWARDS
	The Corporation has issued stock awards (“Restricted Stock Awards”) to officers, certain other employees, and nonemployee members of the Board of Directors of the Corporation, which allow the holders to each receive a certain amount of shares of the Corporation’s common stock generally over a one to seven-year vesting period, of which 304,816 unvested shares were legally outstanding at September 30, 2014.  Of the Restricted Stock Awards issued to executive officers and senior management, 210,000 are contingent upon the Corporation meeting certain performance goals to be set by the Executive Compensation and Option Committee of the Board of Directors of the Corporation each year (“Performance Shares”), with the remaining based on time and service.  These Performance Shares are not considered granted until the performance goals are set.  All currently outstanding and unvested Restricted Stock Awards provided to the officers and certain other employees were issued under the 2013 Plan and 2004 Plan.  Currently outstanding and unvested Restricted Stock Awards provided to directors were issued under the 2013 Plan.
	On September 12, 2012, the Board of Directors of the Corporation approved the recommendations and ratified the determinations of the Executive Compensation and Option Committee of the Board of Directors of the Corporation (the “Committee”) with respect to new Restricted Stock Awards totaling 319,667 shares for those executive officers in place on such date.  The new Restricted Stock Awards may 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.  As the Committee determined that the performance targets for the year ended December 31, 2013 were not satisfied, 63,933 shares due to vest on January 1, 2014 did not vest. Such shares may vest on any subsequent vesting date provided that the performance targets for the subsequent calendar year are met.  Amounts recorded as compensation expense pertaining to these shares during the year ended December 31, 2013 were reversed.  In connection with the departure of two executive officers effective March 31, 2014, the Corporation agreed to grant and accelerate vesting of 109,667 shares of Restricted Stock Awards on April 1, 2014.
	Information regarding the Restricted Stock Awards grant activity is summarized below:
					Weighted-Average
					Grant – Date
		Shares			Fair Value
	Outstanding at January 1, 2014 (a)	153,560		$	25.20
	Granted (b)	208,589			20.83
	Vested	-183,214			22.37
	Forfeited	-119			26.36
	Outstanding at September 30, 2014	178,816		$	23.00
	(a)Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent years’ performance goals are met.
	(b)Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014.  Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.
	TSR-BASED AWARDS
	Also on September 12, 2012, the Board of Directors of the Corporation approved the recommendations and ratified the determinations of the Committee with respect to new multi-year total stockholder return (“TSR”) based awards (the “TSR-Based Awards”) totaling 5,160 performance shares (the “TSR Performance Shares”) for those executive officers in place on such date, each TSR Performance Share evidencing the right to receive $1,000 in the Corporation’s common stock upon vesting.  In accordance with the amended and restated TSR-Based Awards agreements entered into between the Corporation and those executive officers in June 2013, the TSR Performance Shares may vest commencing December 31, 2014, with the number of TSR Performance Shares scheduled to be granted annually over the next four years.  The vesting of each tranche of TSR Performance Shares is subject to the attainment at each performance period end of a minimum stock price and either an absolute TSR target or a relative TSR target (the “TSR Performance Targets”) in comparison to a selection of Peer Group REITs, in each case as shall be fixed by the Committee for each performance period.  TSR, for purposes of the TSR-Based Performance Agreements, shall be equal to the share appreciation in the relevant period.  The Corporation granted 1,032 TSR Performance Shares in the year ended December 31, 2013, which were valued in accordance with ASC 718, Compensation - Stock Compensation, at their fair value, utilizing a Monte-Carlo simulation to estimate the probability of the vesting conditions being satisfied.  The Corporation has reserved shares of common stock under the 2004 Plan for issuance upon vesting of the TSR Performance Shares in accordance with the terms and conditions of the TSR-Based Awards.  In connection with the departure of two executive vice presidents effective March 31, 2014, the Corporation agreed to vest 357 TSR Performance Shares and to grant and accelerate the vesting of 528 TSR Performance Shares, for which the Corporation issued 45,062 shares of Common Stock on April 2, 2014.  See Note 15: Commitments and Contingencies – Departure of Executive Vice Presidents.
	As of September 30, 2014, the Company had $1.6 million of total unrecognized compensation cost related to unvested stock compensation granted under the Corporation’s stock compensation plans.  That cost is expected to be recognized over a weighted average period of 1.3 years.
	DEFERRED STOCK COMPENSATION PLAN FOR DIRECTORS
	The Amended and Restated Deferred Compensation Plan for Directors, which commenced January 1, 1999, allows non‑employee directors of the Corporation to elect to defer up to 100 percent of their annual retainer fee into deferred stock units.  The deferred stock units are convertible into an equal number of shares of common stock upon the directors’ termination of service from the Board of Directors or a change in control of the Corporation, as defined in the plan.  Deferred stock units are credited to each director quarterly using the closing price of the Corporation’s common stock on the applicable dividend record date for the respective quarter.  Each participating director’s account is also credited for an equivalent amount of deferred stock units based on the dividend rate for each quarter.
	During the nine months ended September 30, 2014 and 2013,  15,230 and 16,332 deferred stock units were earned, respectively.  As of September 30, 2014 and December 31, 2013, there were 152,745 and 136,440 deferred stock units outstanding, respectively.
	LIMITED PARTNERS’ CAPITAL
	Common Units
	Certain individuals and entities own common units in the Company.  A common unit and a share of Common Stock of the Corporation have substantially the same economic characteristics in as much as they effectively share equally in the net income or loss of the Company.  Common unitholders (other than the General Partner) have the right to redeem their common units, subject to certain restrictions.  The redemption is required to be satisfied in shares of Common Stock of the General Partner, cash, or a combination thereof, calculated as follows:  one share of the General Partner’s Common Stock, or cash equal to the fair market value of a share of the General Partner’s Common Stock at the time of redemption, for each common unit.  The Company, in its sole discretion, determines the form of redemption of common units (i.e., whether a common unitholder receives Common Stock of the General Partner, cash, or any combination thereof).  If the Company elects to satisfy the redemption with shares of Common Stock of the General Partner as opposed to cash, the General Partner is obligated to issue shares of its Common Stock to the redeeming unitholder.  Regardless of the rights described above, the common unitholders may not put their units for cash to the Company or the General Partner under any circumstances.
	EARNINGS PER UNIT
	Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period.  Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock.
	The following information presents the Company’s results for the three and nine months ended September 30, 2014 and 2013 in accordance with ASC 260, Earning Per Unit: (dollars in thousands, except per unit amounts)
				Three Months Ended						Nine Months Ended
				September 30,						September 30,
	Computation of Basic EPU			2014			2013			2014		2013
	Income (loss) from continuing operations		$	2,085		$	-46,046		$	41,804	$	-29,506
	Add: Noncontrolling interest in consolidated joint ventures			145			1,838			757		1,962
	Income (loss) from continuing operations available to common unitholders			2,230			-44,208			42,561		-27,544
	Income from discontinued operations available to common
	unitholders			-			49,485			-		72,218
	Net income (loss) available to common unitholders		$	2,230		$	5,277		$	42,561	$	44,674
Weighted average common units			99,995			99,787			99,955		99,778
Basic EPU:
Income (loss) from continuing operations available to common unitholders		$	0.02		$	-0.44		$	0.43	$	-0.28
Income from discontinued operations available to common
unitholders			-			0.49			-		0.73
Net income (loss) available to common unitholders		$	0.02		$	0.05		$	0.43	$	0.45
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
Computation of Diluted EPU			2014			2013			2014		2013
Income (loss) from continuing operations available to common unitholders		$	2,230		$	-44,208		$	42,561	$	-27,544
Income from discontinued operations for diluted earnings
per unit			-			49,485			-		72,218
Net income (loss) available to common unitholders		$	2,230		$	5,277		$	42,561	$	44,674
Weighted average common unit			100,052			99,787			100,014		99,778
Diluted EPU:
Income (loss) from continuing operations available to common unitholders		$	0.02		$	-0.44		$	0.43	$	-0.28
Income from discontinued operations available to common
unitholders			-			0.49			-		0.73
Net income (loss) available to common unitholders		$	0.02		$	0.05		$	0.43	$	0.45
The following schedule reconciles the units used in the basic EPU calculation to the units used in the diluted EPU calculation: (in thousands)
	Three Months Ended			Nine Months Ended
	September 30,			September 30,
	2014	2013		2014	2013
Basic EPU units	99,995	99,787		99,955	99,778
Add:   Restricted Stock Awards	57	-		59	-
Diluted EPU units	100,052	99,787		100,014	99,778
Contingently issuable shares under the TSR Award plan were excluded from the denominator in 2014 and 2013 because the criteria had not been met for the periods ended September 30, 2014 and September 30, 2013.  Not included in the computations of diluted EPU were 10,000 and 15,000 stock options as such securities were anti-dilutive during the periods ended September 30, 2014 and 2013, respectively.  Unvested restricted stock outstanding as of September 30, 2014 and 2013 were 304,816 and 351,592 shares, respectively.
Distributions declared per common unit for the three month periods ended September 30, 2014 and 2013 was $0.15 and $0.30 per unit, respectively.  Distributions declared per common unit for the nine month periods ended September 30, 2014 and 2013 was $0.60 and $1.05 per share, respectively.

Noncontrolling_Interests_In_Co

Noncontrolling Interests In Consolidated Joint Ventures	9 Months Ended
	Sep. 30, 2014
Noncontrolling Interests In Consolidated Joint Ventures [Abstract]	'
Noncontrolling Interests In Consolidated Joint Ventures	'
	12. NONCONTROLLING INTERESTS IN CONSOLIDATED JOINT VENTURES
	The Company consolidates certain joint ventures in which it has ownership interests.  Various entities and/or individuals hold noncontrolling interests in these ventures.
	The following table reflects the activity of noncontrolling interests in consolidated joint ventures for the nine months ended September 30, 2014 and 2013, respectively (dollars in thousands):
			Nine Months Ended
			September 30,
			2014		2013
	Balance at January 1	$	55,283	$	56,442
	Net income		-757		-1,962
	Increase in noncontrolling interest		487		1,570
	Balance at September 30	$	55,013	$	56,050
	PARTICIPATION RIGHTS
	The Company’s interests in certain real estate projects (three properties and a future development) each provide for the initial distributions of net cash flow solely to the Company, and thereafter, other parties have participation rights (“Participation Rights”) in 50 percent of the excess net cash flow remaining after the distribution to the Company of the aggregate amount equal to the sum of: (a) the Company’s capital contributions, plus (b) an IRR of 10 percent per annum.

Employee_Benefit_401k_Plans_An

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	9 Months Ended
	Sep. 30, 2014
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements [Abstract]	'
Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements	'
	13.EMPLOYEE BENEFIT 401(k) PLANS AND DEFERRED RETIREMENT COMPENSATION AGREEMENTS
	Employees of the Corporation, who meet certain minimum age and service requirements, are eligible to participate in the Mack-Cali Realty Corporation 401(k) Savings/Retirement Plan (the “401(k) Plan”).  Eligible employees may elect to defer from one percent up to 60 percent of their annual compensation on a pre-tax basis to the 401(k) Plan, subject to certain limitations imposed by federal law.  The amounts contributed by employees are immediately vested and non-forfeitable.  The Corporation may make discretionary matching or profit sharing contributions to the 401(k) Plan on behalf of eligible participants in any plan year.  Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Corporation at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Corporation.  All contributions are allocated as a percentage of compensation of the eligible participants for the Plan year.  The assets of the 401(k) Plan are held in trust and a separate account is established for each participant.  A participant may receive a distribution of his or her vested account balance in the 401(k) Plan in a single sum or in installment payments upon his or her termination of service with the Corporation.  Total expense recognized by the Company for the 401(k) Plan for the three months ended September 30, 2014 and 2013 was $24,000 and $24,000, respectively, and $77,000 and $91,000 for the nine months ended September 30, 2014 and 2013, respectively.
	On September 12, 2012, the Board of Directors of the Corporation approved multi-year deferred retirement compensation agreements for those executive officers in place on such date (the “Deferred Retirement Compensation Agreements”).  Pursuant to the Deferred Retirement Compensation Agreements, the Corporation was to make annual contributions of stock units (“Stock Units”) representing shares of the Corporation’s common stock on January 1 of each year from 2013 through 2017 into a deferred compensation account maintained on behalf of each Messrs. Hersh, Lefkowitz and Thomas.  In connection with Messrs. Lefkowitz and Thomas’ separation from service to the Corporation 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 their respective Deferred Retirement Compensation Agreements (see Note 15: Commitments and Contingencies – Departure of Executive Vice Presidents).  The annual contribution for Mr. Hersh will be in an amount of Stock Units equal to $500,000.  Vesting of each annual contribution of Stock Units will occur on December 31 of each year, subject to continued employment.  Upon the payment of dividends on the Corporation’s common stock, Mr. Hersh shall be entitled to dividend equivalent payments in respect of both vested and unvested Stock Units payable in the form of additional Stock Units.  The Stock Units shall become payable to Mr. Hersh within 30 days after the earliest of any of the following triggering events: (a) Mr. Hersh’s death or disability; (b) the date of Mr. Hersh’s separation from service to the Corporation; and (c) the effective date of a change in control, in each case as such terms are defined in Mr. Hersh’s employment agreement.  Upon the occurrence of a triggering event, the Stock Units shall be paid in cash based on the closing price of the Corporation’s common stock on the date of such triggering event.  The Corporation granted 36,347 Stock Units, including 966 additional Stock Units on accrued dividends, in the nine months ended September 30, 2014.   Total expense recognized by the Company under the Deferred Retirement Compensation Agreements for the three months ended September 30, 2014 and 2013 was $47,000 and $114,000, respectively, and $1.3 million (see Note 15: Commitments and Contingencies – Departure of Executive Vice Presidents) and $455,000 for the nine months ended September 30, 2014 and 2013, respectively.

Disclosure_Of_Fair_Value_Of_Fi

Disclosure Of Fair Value Of Financial Instruments	9 Months Ended
	Sep. 30, 2014
Disclosure Of Fair Value Of Financial Instruments [Abstract]	'
Disclosure Of Fair Value Of Financial Instruments	'
	14.DISCLOSURE OF FAIR VALUE OF FINANCIAL INSTRUMENTS
	The following disclosure of estimated fair value was determined by management using available market information and appropriate valuation methodologies.  However, considerable judgment is necessary to interpret market data and develop estimated fair value.  Accordingly, the estimates presented herein are not necessarily indicative of the amounts the Company could realize on disposition of the financial instruments at September 30, 2014 and December 31, 2013.  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, 2014 and December 31, 2013.
	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 $2,283,232,000 and $2,407,802,000 as compared to the book value of approximately $2,238,641,000 and $2,362,766,000 as of September 30, 2014 and December 31, 2013, respectively.  The fair value of the Company’s long-term debt is categorized as a level 3 basis (as provided by ASC 820, Fair Value Measurements and Disclosures).  The fair value is estimated using a discounted cash flow analysis valuation based on the borrowing rates currently available to the Company for loans with similar terms and maturities.  The fair value of the mortgage debt and the unsecured notes was determined by discounting the future contractual interest and principal payments by a market rate.  Although the Company has determined that the majority of the inputs used to value its derivative financial instruments fall within level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivative financial instruments utilize level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. The Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative financial instruments. As a result, the Company has determined that its derivative financial instruments valuations in their entirety are classified in level 2 of the fair value hierarchy.
	Disclosure about fair value of financial instruments is based on pertinent information available to management as of September 30, 2014 and December 31, 2013.  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, 2014 and current estimates of fair value may differ significantly from the amounts presented herein.

Commitments_And_Contingencies

Commitments And Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments And Contingencies [Abstract]	'
Commitments And Contingencies	'
	15.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, 2014 and 2013, respectively, and $742,000 and $742,000 for the nine months ended September 30, 2014 and 2013, 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, 2014 and 2013, respectively, and $2.6 million and $2.6 million for the nine months ended September 30, 2014 and 2013, respectively.
	The agreement with the City of Weehawken for its Port Imperial 4/5 garage development project (acquired in the Roseland Transaction) was executed in March 2011 and has a term of five years beginning when the project is substantially complete, which occurred in the third quarter 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 executed in 2009 provides that real estate taxes will be partially abated, on a declining scale, for four years from 2011 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, 2014, are as follows: (dollars in thousands)
	Year		Amount
	October 1 through December 31, 2014	$	92
	2015		371
	2016		371
	2017		267
	2018		232
	2019 through 2084		15,818
	Total	$	17,151
	Ground lease expense incurred by the Company during the three months ended September 30, 2014 and 2013 amounted to $102,000 and $102,000, respectively, and $305,000 and $305,000 for the nine months ended September 30, 2014 and 2013, 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.  The Earn Out largely represents contingent consideration and requires the Company to pay Roseland Partners up to an aggregate maximum of $15.6 million.  The Earn Out is based on defined criteria, as follows: (i) the Roseland Assets component of up to $8.6 million for the completion of certain developments ($2.8 million), and the start of construction on others ($2.8 million), obtaining tax credits/grants on others ($3.0 million), all of which are payable over various periods of up to three years; and (ii) total return to shareholders for up to an additional $7 million, based on a total return to shareholders measured on a three year cumulative basis and on discrete years, both on an absolute basis and in comparison to a peer group.  Each of the Earn Out elements were separately valued as of the acquisition date with an aggregate fair value of contingent consideration of approximately $10 million (representing $6.3 million for the Roseland Assets and $3.7 million for the total return to shareholders component).  During the three and nine months ended September 30, 2014, the Company recognized benefits of zero and  $380,000 related to a decline in fair value in the Earn Out liability, which is included in Interest and other investment income for the period. Prospectively, the Earn Out liability will be remeasured at fair value quarterly until the contingency has been resolved, with any changes in fair value representing a charge or benefit directly to earnings (with no adjustment to purchase accounting).  The measures of the Earn Out are based on significant inputs that are not observable in the market, which ASC 820 refers to as level 3 inputs.  In addition to an appropriate discount rate, the key assumption affecting the valuation for the Roseland Assets component was the probability of occurrence of the payment events under the relevant provisions (management assumed between 92 and 99 percent for completion/start criteria and 50 percent for the tax credit/grant criteria in its initial valuation).  The valuation of the TRS component includes assumptions for the risk-free rate and various other factors (i.e., stock price, dividend levels and volatility) for the Company and the relevant peer group, as defined in the Earn Out agreement.  As a result of the achievement of certain of the defined criteria, the Company paid Roseland Partners $2.8 million on January 25, 2013,  $1.4 million on March 21, 2014 and $1.4 million on September 17, 2014 related to the Roseland Assets component of the Earn Out. On July 18, 2014, the Company agreed to pay $1 million of the $3 million Earn Out related to certain tax credits/grants.  The $1 million payment had previously been at the chief executive officer’s discretion and was being accrued over the three-year period as compensation expense, and not as contingent consideration of the purchase price.  As of September 30, 2014, the balance of the Earn Out liabilities amounted to $2.4 million.  See Roseland Transaction Modifications following in this Note.  The Company previously recorded the $2.8 million payment of contingent consideration described above in the nine-month period ended September 30, 2013 as a cash out flow from investing activity.   Management subsequently concluded that the payment should be appropriately classified as a cash out flow from financing activity and had reflected it as such in the annual financial statements for 2013.  The cash flow statement for the nine month period ended September 30, 2013 presented herein has been revised to reflect this change in classification.  The Company has determined that the impact to the 2013 quarterly financial statements is not material.
	The purchase consideration for the Roseland Transaction is subject to the return of a portion of the purchase price of up to $2.0 million upon the failure to achieve a certain level of fee revenue from the Roseland Business during the 33-month period following the closing date.  Because the fee target was highly probable, no discount was ascribed to this contingently returnable consideration.  Also, at the closing, approximately $34 million in cash of the purchase price was deposited in escrow to secure certain of the indemnification obligations of Roseland Partners and its affiliates.  In April 2013, $6.7 million of the escrow was released to Roseland Partners and on July 18, 2014, the Company agreed to release all remaining escrow funds to Roseland Partners. See Roseland Transaction Modifications following in this Note.
	DEPARTURE OF EXECUTIVE VICE PRESIDENTS
	On March 3, 2014, the Company announced that Barry Lefkowitz was leaving his position as Executive Vice President and Chief Financial Officer of the Corporation effective March 31, 2014.  In connection with Mr. Lefkowitz’s departure, he received severance benefits payable pursuant to his employment agreement and outstanding equity compensation awards, including an aggregate cash payment of approximately $3.4 million, vesting of 11,457 newly issued shares of common stock of the Corporation, and vesting of 68,667 unvested shares of Restricted Stock Awards. The Company also will pay the premiums for the continuation of Mr. Lefkowitz’s existing health insurance for a period up to 48 months following March 31, 2014.
	Also on March 3, 2014, the Company announced that Roger W. Thomas was leaving his position as Executive Vice President, General Counsel and Secretary of the Corporation effective March 31, 2014.  In connection with Mr. Thomas’ departure, he received severance benefits payable pursuant to his employment agreement and outstanding equity compensation awards, including an aggregate cash payment of approximately $3.1 million, acceleration and discretionary full vesting of 33,605 newly issued shares of common stock of the Corporation, and vesting of 41,000 unvested shares of Restricted Stock Awards. The Company also will pay the premiums for the continuation of Mr. Thomas’ existing health insurance for a period of up to 48 months following September 30, 2014. Mr. Thomas served as a consultant to the Corporation from April 1, 2014 through September 30, 2014 for  an aggregate cash compensation of $300,000.
	The Company’s total estimated costs for the departure of the two executive vice presidents of approximately $11 million during the nine months ended September 30, 2014 was included in general and administration expense (approximately $8 million was included in accounts payable, accrued expenses and other liabilities as of September 30, 2014).
	ROSELAND TRANSACTION MODIFICATIONS
	On July 18, 2014, the Company entered into separation agreements (the “Separation Agreements”) with each of Bradford R. Klatt and Carl Goldberg, formerly principals of Roseland Partners who have served as co-presidents of Roseland Management since the Company acquired the Roseland Business in October 2012.  The Separation Agreements provide that the employment agreements of Messrs. Klatt and Goldberg terminate and that they shall resign as co-presidents of Roseland Management effective October 23, 2014 (the “Separation Date”).  Also on July 18, 2014, the Company amended its purchase agreement with the sellers of the Roseland Business (the “Roseland Amendment”) to modify certain terms of the Roseland Transaction in connection with the departures of Messrs. Klatt and Goldberg.  In addition, Mr. Goldberg entered into a consulting agreement with Roseland Management (the “Consulting Agreement”) pursuant to which he shall provide consulting services for a period of one year following the Separation Date for $400,000 payable in four, equal quarterly installments.
	Pursuant to the Separation Agreements, each of Messrs. Klatt and Goldberg shall receive a separation payment of $750,000 within five days following the Separation Date, and an additional payment of $500,000 in full satisfaction of any and all bonus payments under their respective employment agreements, which amount shall be paid six months after the date of their “separation from service” as defined in Section 409A of the Internal Revenue Code of 1986, as amended, and the Treasury Regulations and other guidance promulgated thereunder.  The Separation Agreements also contain customary mutual releases of claims and non-disparagement provisions, and Mr. Goldberg’s Consulting Agreement contains customary non-compete, confidentiality and indemnification covenants.  Mr. Goldberg’s Separation Agreement also provides that Roseland Management shall pay the premiums for the continuation of his existing health insurance for a period of one year from the Separation Date or until any earlier termination of his Consulting Agreement.
	The Roseland Amendment provides for the following material modifications to the Roseland Transaction:
	1.The non-competition covenants as they apply to Messrs. Klatt and Goldberg shall terminate on the Separation Date, and the non-competition covenants as they apply to Marshall Tycher shall be amended to permit Mr. Tycher to invest in certain future, family-controlled business ventures, subject to a right of first offer by the Company to make an investment of at least 50 percent in multi-family properties or projects covered by the right of first offer;
	2.The release to the sellers of the Roseland Business of all remaining funds held in the indemnity escrow account and the acceleration of the effectiveness of certain indemnity covenants to the Separation Date; and
	3. The payment of $1 million of the $3 million Earn Out related to certain tax credits/grants.
	The Company’s total estimated costs related to the Separation Agreements and Roseland Amendment of approximately $1.1 million in the three and nine months ended September 30, 2014 was included in general and administration expense.  Included in accounts payable, accrued expense and other liabilities as of September 30, 2014 was $2.6 million related to the Separation Agreements and Roseland Amendment.
	OTHER
	The Company may not dispose of or distribute certain of its properties, currently comprised of seven properties with an aggregate net book value of approximately $125.2 million, which were originally contributed by certain unrelated common unitholders, without the express written consent of such common unitholders, as applicable, except in a manner which does not result in recognition of any built-in-gain (which may result in an income tax liability) or which reimburses the appropriate specific common unitholders for the tax consequences of the recognition of such built-in-gains (collectively, the “Property Lock-Ups”).  The aforementioned restrictions do not apply in the event that the Company sells all of its properties or in connection with a sale transaction which the Corporation’s Board of Directors determines is reasonably necessary to satisfy a material monetary default on any unsecured debt, judgment or liability of the Company or to cure any material monetary default on any mortgage secured by a property.  The Property Lock-Ups expire periodically through 2016.  Upon the expiration of the Property Lock-Ups, the Company is generally required to use commercially reasonable efforts to prevent any sale, transfer or other disposition of the subject properties from resulting in the recognition of built-in gain to the specific common unitholders, which include members of the Mack Group (which includes William L. Mack, Chairman of the Corporation’s Board of Directors; David S. Mack, director of the Corporation; Earle I. Mack, a former director of the Corporation; and Mitchell E. Hersh, president, chief executive officer and director of the Corporation), the Robert Martin Group (which includes Robert F. Weinberg, a former director of the Corporation and current member of its Advisory Board), and the Cali Group (which includes John R. Cali, a former director of the Corporation and current member of its Advisory Board).  110 of the Company’s properties, with an aggregate net book value of approximately $1.3 billion, have lapsed restrictions and are subject to these conditions.
	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 to be delivered by the Company in the third quarter of 2015.  The Company expects to incur costs of approximately $15.7 million for the development of the site through the fourth quarter of 2016 (of which the Company has incurred $7.0 million through September 30, 2014).

Tenant_Leases

Tenant Leases	9 Months Ended
	Sep. 30, 2014
Tenant Leases [Abstract]	'
Tenant Leases	'
	16.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, 2014 are as follows (dollars in thousands):
	Year		Amount
	October 1 through December 31, 2014	$	118,687
	2015		445,922
	2016		408,691
	2017		357,819
	2018		276,297
	2019 and thereafter		1,067,223
	Total	$	2,674,639
	Multi-family rental property residential leases are excluded from the above table as they generally expire within one year.

Segment_Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting	'
	17.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 has significantly reduced its operations.  The Company had no revenues from foreign countries recorded for the nine months ended September 30, 2014 and 2013.  The Company had no long lived assets in foreign locations as of September 30, 2014 and December 31, 2013.  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, 2014 and 2013 and selected asset information as of September 30, 2014 and December 31, 2013 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:
	30-Sep-14	$	142,486	$	6,459	$	8,300	(e)		$	-1,756	$	155,489
	30-Sep-13		155,129		3,736		6,867	(f)			-3,227		162,505
	Nine months ended:
	30-Sep-14		447,779		18,593		22,650	(g)			-3,637		485,385
	30-Sep-13		469,026		8,673		18,745	(h)			5,320		501,764
	Total operating and
	interest expenses (a):
	Three months ended:
	30-Sep-14	$	69,315	$	3,271	$	10,249			$	27,582	$	110,417
	30-Sep-13		71,356		1,960		8,214				31,998		113,528
	Nine months ended:
	30-Sep-14		226,798		8,976		28,790				100,126		364,690
	30-Sep-13		207,637		4,066		23,345				110,341		345,389
	Equity in earnings (loss) of
	unconsolidated joint ventures:
	Three months ended:
	30-Sep-14	$	328	$	-2,088	$	492			$	-	$	-1,268
	30-Sep-13		1,919		-2,830		682				-		-229
	Nine months ended:
	30-Sep-14		3,145		-6,566		1,361				-		-2,060
	30-Sep-13		5,149		-7,890		682				-		-2,059
	Net operating income (loss) (b):
	Three months ended:
	30-Sep-14	$	73,499	$	1,100	$	-1,457			$	-29,338	$	43,804
	30-Sep-13		85,692		-1,054		-665				-35,225		48,748
	Nine months ended:
	30-Sep-14		224,126		3,051		-4,779				-103,763		118,635
	30-Sep-13		266,538		-3,283		-3,918				-105,021		154,316
	Total assets:
	30-Sep-14	$	3,861,779	$	460,998	$	10,648			$	23,772	$	4,357,197
	31-Dec-13		3,886,574		377,237		10,488				241,029		4,515,328
	Total long-lived assets (c):
	30-Sep-14	$	3,333,851	$	315,841	$	3,909			$	3,438	$	3,657,039
	31-Dec-13		3,620,494		240,501		3,468				3,730		3,868,193
	Total investments in
	unconsolidated joint ventures:
	30-Sep-14	$	82,012	$	157,215	$	540			$	-	$	239,767
	31-Dec-13		53,160		127,276		693				-		181,129
	(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 income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods.
	(b)Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.
	(c)Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill.
	(d)Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense, construction services revenue and direct construction costs) as well as intercompany eliminations necessary to reconcile to consolidated Company totals.
	(e)Includes $1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(f)Includes $665 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(g)Includes $2,962 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(h)Includes $1,432 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	The following schedule reconciles net operating income to net income available to common unitholders: (dollars in
	thousands)
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014			2013
	Net operating income	$	43,804	$	48,748	$	118,635		$	154,316
	Less:
	Depreciation and amortization		-41,983		-46,094		-131,679			-135,122
Realized gains  on disposition of
rental property, net		264		-		54,848			-
Impairments				-48,700					-48,700
Income (loss) from continuing operations		2,085		-46,046		41,804			-29,506
Discontinued operations:
Income from discontinued operations		-		2,164		-			11,842
Loss from early extinguishment of debt		-		-		-			-703
Realized gains  on disposition of
rental property, net		-		47,321		-			61,079
Total discontinued operations		-		49,485		-			72,218
Net income		2,085		3,439		41,804			42,712
Noncontrolling interest in consolidated joint ventures		145		1,838		757			1,962
Net income available to common unitholders	$	2,230	$	5,277	$	42,561		$	44,674

Impact_Of_RecentlyIssued_Accou

Impact Of Recently-Issued Accounting Standards	9 Months Ended
	Sep. 30, 2014
Impact Of Recently-Issued Accounting Standards [Abstract]	'
Impact Of Recently-Issued Accounting Standards	'
	18.  IMPACT OF RECENTLY-ISSUED ACCOUNTING STANDARDS
	FASB Accounting Standards Update No. 2014-2015, Presentation of Financial Statements – Going Concern (Subtopic 205-40) – Disclosure about an Entity’s Ability to Continue as a Going Concern
	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.

Significant_Accounting_Policie1

Significant Accounting Policies (Policy)	9 Months Ended
	Sep. 30, 2014
Significant Accounting Policies [Abstract]	'
Rental Property	'
	Rental
	PropertyRental properties are stated at cost less accumulated depreciation and amortization.  Costs directly related to the acquisition, development and construction of rental properties are capitalized.  Acquisition‑related costs are expensed as incurred.  Capitalized development and construction costs include pre-construction costs essential to the development of the property, development and construction costs, interest, property taxes, insurance, salaries and other project costs incurred during the period of development.  Capitalized development and construction salaries and related costs approximated $1.0 million and $1.9 million for the three months ended September 30, 2014 and 2013, respectively, and $2.7 million and $3.7 million for the nine months ended September 30, 2014 and 2013, respectively. Included in total rental property is construction, tenant improvement and development in-progress of $58.8 million and $40.8 million as of September 30, 2014 and December 31, 2013, respectively.  Ordinary repairs and maintenance are expensed as incurred; major replacements and betterments, which improve or extend the life of the asset, are capitalized and depreciated over their estimated useful lives.  Fully-depreciated assets are removed from the accounts.
	The Company considers a construction project as substantially completed and held available for occupancy upon the substantial completion of tenant improvements, but no later than one year from cessation of major construction activity (as distinguished from activities such as routine maintenance and cleanup).  If portions of a rental project are substantially completed and occupied by tenants, or held available for occupancy, and other portions have not yet reached that stage, the substantially completed portions are accounted for as a separate project.  The Company allocates costs incurred between the portions under construction and the portions substantially completed and held available for occupancy, primarily based on a percentage of the relative square footage of each portion, and capitalizes only those costs associated with the portion under construction.
	Properties are depreciated using the straight-line method over the estimated useful lives of the assets.  The estimated useful lives are as follows:
	Leasehold interests	Remaining lease term
	Buildings and improvements	5 to 40 years
	Tenant improvements	The shorter of the term of the
		related lease or useful life
	Furniture, fixtures and equipment	5 to 10 years
	Upon acquisition of rental property, the Company estimates the fair value of acquired tangible assets, consisting of land, building and improvements, and identified intangible assets and liabilities assumed, generally consisting of the fair value of (i) above and below market leases, (ii) in-place leases and (iii) tenant relationships.  The Company allocates the purchase price to the assets acquired and liabilities assumed based on their fair values.  The Company records goodwill or a gain on bargain purchase (if any) if the net assets acquired/liabilities assumed exceed the purchase consideration of a transaction.  In estimating the fair value of the tangible and intangible assets acquired, the Company considers information obtained about each property as a result of its due diligence and marketing and leasing activities, and utilizes various valuation methods, such as estimated cash flow projections utilizing appropriate discount and capitalization rates, estimates of replacement costs net of depreciation, and available market information.  The fair value of the tangible assets of an acquired property considers the value of the property as if it were vacant.
	Above-market and below-market lease values for acquired properties are initially recorded based on the present value (using a discount rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of fair market lease rates for each corresponding in-place lease, measured over a period equal to the remaining term of the lease for above-market leases and the remaining initial term plus the term of any below-market fixed rate renewal options for below-market leases. The capitalized above-market lease values are amortized as a reduction of base rental revenue over the remaining terms of the respective leases, and the capitalized below-market lease values are amortized as an increase to base rental revenue over the remaining initial terms plus the terms of any below-market fixed rate renewal options of the respective leases.
	Other intangible assets acquired include amounts for in-place lease values and tenant relationship values, which are based on management’s evaluation of the specific characteristics of each tenant’s lease and the Company’s overall relationship with the respective tenant.  Factors to be considered by management in its analysis of in-place lease values include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions, and costs to execute similar leases.  In estimating carrying costs, management includes real estate taxes, insurance and other operating expenses and estimates of lost rentals at market rates during the expected lease-up periods, depending on local market conditions.  In estimating costs to execute similar leases, management considers leasing commissions, legal and other related expenses.  Characteristics considered by management in valuing tenant relationships include the nature and extent of the Company’s existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and expectations of lease renewals.  The value of in-place leases are amortized to expense over the remaining initial terms of the respective leases.  The value of tenant relationship intangibles are amortized to expense over the anticipated life of the relationships.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company’s rental properties held for use may be impaired.  In addition to identifying any specific circumstances which may affect a property or properties, management considers other criteria for determining which properties may require assessment for potential impairment.  The criteria considered by management include reviewing low leased percentages, significant near-term lease expirations, recently acquired properties, current and historical operating and/or cash flow losses, near-term mortgage debt maturities or other factors that might impact the Company’s intent and ability to hold the property.  A property’s value is impaired only if management’s estimate of the aggregate future cash flows (undiscounted and without interest charges) to be generated by the property is less than the carrying value of the property.  To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the property over the fair value of the property.  The Company’s estimates of aggregate future cash flows expected to be generated by each property are based on a number of assumptions.  These assumptions are generally based on management’s experience in its local real estate markets and the effects of current market conditions.  The assumptions are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and costs to operate each property.  As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the future cash flows estimated by management in its impairment analyses may not be achieved, and actual losses or impairments may be realized in the future.
Rental Property Held For Sale	'
	Rental Property
	Held for Sale When assets are identified by management as held for sale, the Company discontinues depreciating the assets and estimates the sales price, net of selling costs, of such assets.  If, in management’s opinion, the estimated net sales price of the assets which have been identified as held for sale is less than the net book value of the assets, a valuation allowance is established.
	If circumstances arise that previously were considered unlikely and, as a result, the Company decides not to sell a property previously classified as held for sale, the property is reclassified as held and used.  A property that is reclassified is measured and recorded individually at the lower of (a) its carrying amount before the property was classified as held for sale, adjusted for any depreciation (amortization) expense that would have been recognized had the property been continuously classified as held and used, or (b) the fair value at the date of the subsequent decision not to sell.
Investments In Unconsolidated Joint Ventures	'
	Investments in
	Unconsolidated
	Joint VenturesThe Company accounts for its investments in unconsolidated joint ventures under the equity method of accounting.  The Company applies the equity method by initially recording these investments at cost, as Investments in Unconsolidated Joint Ventures, subsequently adjusted for equity in earnings and cash contributions and distributions.  The outside basis portion of the Company’s joint ventures is amortized over the anticipated useful lives of the underlying ventures’ tangible and intangible assets acquired and liabilities assumed.  Generally, the Company would discontinue applying the equity method when the investment (and any advances) is reduced to zero and would not provide for additional losses unless the Company has guaranteed obligations of the venture or is otherwise committed to providing further financial support for the investee.  If the venture subsequently generates income, the Company only recognizes its share of such income to the extent it exceeds its share of previously unrecognized losses.
	On a periodic basis, management assesses whether there are any indicators that the value of the Company’s investments in unconsolidated joint ventures may be impaired.  An investment is impaired only if management’s estimate of the value of the investment is less than the carrying value of the investment, and such decline in value is deemed to be other than temporary.  To the extent impairment has occurred, the loss shall be measured as the excess of the carrying amount of the investment over the value of the investment.  The Company’s estimates of value for each investment (particularly in real estate joint ventures) are based on a number of assumptions that are subject to economic and market uncertainties including, among others, demand for space, competition for tenants, changes in market rental rates, and operating costs.  As these factors are difficult to predict and are subject to future events that may alter management’s assumptions, the values estimated by management in its impairment analyses may not be realized, and actual losses or impairment may be realized in the future.  See Note 4: Investments in Unconsolidated Joint Ventures.
Cash And Cash Equivalents	'
	Cash and Cash
	EquivalentsAll highly liquid investments with a maturity of three months or less when purchased are considered to be cash equivalents.
Deferred Financing Costs	'
	Deferred
	Financing CostsCosts 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 $778,000 and $954,000 for the three months ended September 30, 2014 and 2013, respectively,  $2,306,000 and $2,379,000 for the nine months ended September 30, 2014 and 2013, respectively. If a financing obligation is extinguished early, any unamortized deferred financing costs are written off and included in gains (loss) from early extinguishment of debt.
Deferred Leasing Costs	'
	Deferred
	Leasing CostsCosts incurred in connection with commercial leases are capitalized and amortized on a straight-line basis over the terms of the related leases and included in depreciation and amortization.  Unamortized deferred leasing costs are charged to amortization expense upon early termination of the lease. Certain employees of the Corporation are compensated for providing leasing services to the Properties.  The portion of such compensation related to commercial leases, which is capitalized and amortized, approximated  $940,000 and  $962,000 for the three months ended September 30, 2014 and 2013,  respectively, and $2,816,000 and $3,168,000 for the nine months ended September 30, 2014 and 2013, respectively.
Goodwill	'
	GoodwillGoodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired in a business combination. Goodwill is allocated to various reporting units, as applicable.  Each of the Company’s segments consists of a reporting unit.  Goodwill is not amortized. Management performs an annual impairment test for goodwill during the fourth quarter and between annual tests, management evaluates the recoverability of goodwill whenever events or changes in circumstances indicate that the carrying amount of goodwill may not be fully recoverable.  In its impairment tests of goodwill, management first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount.  If based on this assessment, management determines that the fair value of the reporting unit is not less than its carrying amount, then performing the additional two-step impairment test is unnecessary. If the carrying amount of goodwill exceeds its fair value, an impairment charge is recognized.
Derivative Instruments	'
	Derivative
	InstrumentsThe 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
	RecognitionBase 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 16: Tenant Leases.
	Construction services revenue includes fees earned and reimbursements received by the Company for providing construction management and general contractor services to clients.  Construction services revenue is recognized on the percentage of completion method.  Using this method, profits are recorded on the basis of our estimates of the overall profit and percentage of completion of individual contracts.  A portion of the estimated profits is accrued based upon estimates of the percentage of completion of the construction contract.  This revenue recognition method involves inherent risks relating to profit and cost estimates.
	Real estate services revenue includes property management, development 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.
	In May 2014, the Financial Accounting Standards Board (“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, 2016, and early adoption is not permitted.  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.
Allowance For Doubtful Accounts	'
	Allowance for
	Doubtful AccountsManagement 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 TaxesThe Company is a partnership, and, as a result, all income and losses of the partnership are allocated to the partners for inclusion in their respective tax returns.  Accordingly, no provision or benefit for income taxes has been made in the accompanying financial statements.
	Certain of the Company’s corporate subsidiaries are taxable REIT subsidiaries (each a “TRS”).  In general, a TRS may perform additional services for tenants of the Company and generally may engage in any real estate or non-real estate related business (except for the operation or management of health care facilities or lodging facilities or the providing to any person, under a franchise, license or otherwise, rights to any brand name under which any lodging facility or health care facility is operated).  A TRS is subject to corporate federal income tax.  The Company has conducted business through its TRS entities for certain property management, development, construction and other related services, as well as to hold a joint venture interest in a hotel and other matters.  As of September 30, 2014, the Company had a deferred tax asset with a balance of approximately  $14.1 million which has been fully reserved for through a valuation allowance.  If the Corporation fails to qualify as a REIT in any taxable year, the Corporation will be subject to federal income tax (including any applicable alternative minimum tax) on its taxable income at regular corporate tax rates.  The Corporation is subject to certain state and local taxes.
	Pursuant to the amended provisions related to uncertain tax provisions of ASC 740, Income Taxes, the Company recognized no material adjustments regarding its tax accounting treatment.  The Company expects to recognize interest and penalties related to uncertain tax positions, if any, as income tax expense, which is included in general and administrative expense.
	In the normal course of business, the Company or one of its subsidiaries is subject to examination by federal, state and local jurisdictions in which it operates, where applicable.  As of September 30, 2014, the tax years that remain subject to examination by the major tax jurisdictions under the statute of limitations are generally from the year 2009 forward.
Earnings Per Unit	'
	Earnings
	Per UnitThe Company presents both basic and diluted earnings per unit (“EPU”).  Basic EPU excludes dilution and is computed by dividing net income available to common unitholders by the weighted average number of units outstanding for the period.  Diluted EPU reflects the potential dilution that could occur if securities or other contracts to issue common units were exercised or converted into common units, where such exercise or conversion would result in a lower EPU amount from continuing operations amount.  Units whose issuance is contingent upon the satisfaction of certain conditions shall be considered outstanding and included in the computation of diluted EPU as follows (i) if all necessary conditions have been satisfied by the end of the period (the events have occurred), those units shall be included as of the beginning of the period in which the conditions were satisfied (or as of the date of the grant, if later) or (ii) if all necessary conditions have not been satisfied by the end of the period, the number of contingently issuable units included in diluted EPU shall be based on the number of units, if any, that would be issuable if the end of the reporting period were the end of the contingency period (for example, the number of units that would be issuable based on current period earnings or period-end market price) and if the result would be dilutive. Those contingently issuable units shall be included in the denominator of diluted EPU as of the beginning of the period (or as of the date of the grant, if later).
Distributions Payable	'
	Distributions
	PayableThe distributions payable at September 30, 2014 represents distributions payable to common unitholders (99,907,400 units) for all such holders of record as of October 3, 2014 with respect to the third quarter 2014.  The third quarter 2014 common unit distributions of $0.15 per common unit were approved by the Corporation’s Board of Directors on September 11, 2014.  The common unit distributions payable were paid on October 10, 2014.
	The distributions payable at December 31, 2013 represents distributions payable to common unitholders (99,792,777 units), for all such holders of record as of January 6, 2014 with respect to the fourth quarter 2013.  The fourth quarter 2013 common unit distributions of $0.30 per common unit were approved by the Corporation’s Board of Directors on December 10, 2013.  The common unit distributions payable were paid on January 15, 2014.
Costs Incurred For Stock Issuances	'
	Costs Incurred
	For Stock
	IssuancesCosts incurred in connection with the Corporation’s stock issuances are reflected as a reduction of General Partner’s capital.
Stock Compensation	'
	Stock
	CompensationThe 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”), TSR-based Performance Shares and stock options at the grant date be amortized ratably into expense over the appropriate vesting period.  The Company recorded stock compensation expense of $830,000 and $641,000 for the three months ended September 30, 2014 and 2013, respectively, and $5,094,000 (which includes $3,150,000 related to the departure of executive vice presidents.  See Note 15: Commitments and Contingencies – Departure of Executive Vice Presidents); and $1,947,000 for the nine months ended September 30, 2014 and 2013, respectively.
Other Comprehensive Income	'
	Other
	Comprehensive
	IncomeOther comprehensive income (loss) 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, 2014 and 2013, and no accumulated other comprehensive income as of September 30, 2014 and December 31, 2013.
Fair Value Hierarchy	'
	Fair Value
	HierarchyThe 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 inactive 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.

Significant_Accounting_Policie2

Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2014
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

Real_Estate_Transactions_Table

Real Estate Transactions (Tables)	9 Months Ended
	Sep. 30, 2014
Real Estate Properties [Line Items]	'
Schedule Of Purchase Price Allocation	'
			Andover
			Place
	Land	$	8,535
	Buildings and improvements		27,609
	Furniture, fixtures and equipment		459
	In-place lease values (1)		1,118
			37,721
	Less: Below market lease values (1)		-25
	Net cash paid at acquisition	$	37,696
	(1) In-place lease values and below market lease values will be amortized over one year or less.
Schedule Of Property Sales	'
					Rentable			Net			Net
	Sale			# of	Square			Sales			Book			Realized
	Date	Property/Address	Location	Bldgs.	Feet			Proceeds			Value			Gain
	4/23/14	22 Sylvan Way	Parsippany, New Jersey	1	249,409		$	94,897		$	60,244		$	34,653
	6/23/14	30 Knightsbridge Road (a)	Piscataway, New Jersey	4	680,350			54,641			52,361			2,280
	6/23/14	470 Chestnut Ridge Road (a) (b)	Woodcliff Lake, New Jersey	1	52,500			7,195			7,109			86
	6/23/14	530 Chestnut Ridge Road (a) (b)	Woodcliff Lake, New Jersey	1	57,204			6,299			6,235			64
	6/27/14	400 Rella Boulevard	Suffern, New York	1	180,000			27,539			10,938			16,601
	6/30/14	412 Mount Kemble Avenue (a)	Morris Township, New Jersey	1	475,100			44,751			43,851			900
	7/29/14	17-17 Route 208 North (a) (b)	Fair Lawn, New Jersey	1	143,000			11,835			11,731			104
	8/20/14	555, 565, 570 Taxter Road (a)	Elmsford, New York	3	416,108			41,057			41,057			-
	8/20/14	200, 220 White Plains Road (a)	Tarrytown, New York	2	178,000			12,619			12,619			-
	8/20/14	1266 East Main Street (a) (b)	Stamford, Connecticut	1	179,260			18,406			18,246			160
	Totals:			16	2,610,931		$	319,239		$	264,391		$	54,848
	(a)The Company completed the sale of these properties for approximately $221 million comprised of: $192.5 million in cash from a combination of affiliates of Keystone Property Group (“Keystone Entities”) senior and pari-passu equity and mortgage financing; Company subordinated equity interests in each of the properties sold with capital accounts aggregating $21.2 million and Company pari-passu equity interests in five of the properties sold aggregating $7.3 million.  Net sale proceeds from the sale aggregated $196.8 million which was comprised of the $221 million gross sales price less the subordinated equity interests of $21.2 million and $3 million in closing costs.  The purchasers of these properties are unconsolidated joint ventures formed between the Company and the Keystone Entities.  The senior and pari-passu equity will receive a 15 percent internal rate of return (“IRR”) after which the subordinated equity will receive a 10 percent IRR and then all distributable cash flow will be split equally between the Keystone Entities and the Company.  See Note 4: Investments in Unconsolidated Joint Ventures.  In connection with certain of these partial sale transactions, because the buyer received a preferential return on certain of the ventures for which the Company received subordinated equity interests, the Company only recognized profit to the extent that they received net proceeds in excess of their entire carrying value of the properties, effectively reflecting their retained subordinated equity interest at zero.
	(b)The Company recorded an impairment charge of $20.7 million on these properties at December 31, 2013 as it estimated that the carrying value of the properties may not be recoverable over their anticipated holding periods.
Summary Of Income From Properties Sold	'
		Three Months Ended			Nine Months Ended
			September 30,		September 30,
			2013			2013
	Total revenues	$	6,405		$	33,610
	Operating and other expenses		-2,472			-13,454
	Depreciation and amortization		-1,769			-8,196
	Interest expense		-			-118
	Income from discontinued operations		2,164			11,842
	Loss from early extinguishment of debt		-			-703
	Impairments (1)		-			-23,851
	Realized gains on disposition of rental property		47,321			84,930
	Realized gains (losses) on disposition
	of rental property and impairments, net		47,321			61,079
	Total discontinued operations	$	49,485		$	72,218
	(1)Represents impairment charges recorded on certain properties prior to their sale.
Properties Sold, Year To Date [Member]	'
Real Estate Properties [Line Items]	'
Summary Of Income From Properties Sold	'
				Three Months Ended						Nine Months Ended
				September 30,						September 30,
				2014			2013			2014			2013
	Total revenues		$	2,763		$	13,672		$	28,824		$	41,965
	Operating and other expenses			-1,957			-7,368			-17,248			-20,681
	Depreciation and amortization			-502			-3,600			-6,371			-10,945
	Interest income			2			-			4			-
	Income from properties sold		$	306		$	2,704		$	5,209		$	10,339

Investments_In_Unconsolidated_1

Investments In Unconsolidated Joint Ventures (Tables)	9 Months Ended
	Sep. 30, 2014
Investments In Unconsolidated Joint Ventures [Abstract]	'
Summary Of Unconsolidated Joint Ventures	'
		Number of		Company's				Company's			Property Debt
		Apartment Units		Effective				Carrying				Maturity	Interest
	Entity / Property Name	or Square Feet (sf)		Ownership % (a)				Amount			Balance	Date	Rate
	Multi-family
	Marbella RoseGarden, L.L.C./ Marbella  (b)	412	units	24.27	%		$	15,784		$	95,000	5/1/18	4.99	%
	RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)  (b)	523	units	15.00	%			2,438			165,000	2/1/21	4.19	%
	Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station  (b)	217	units	25.00	%			275			38,846	7/1/15	4.00	%
	PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial (b)	236	units	50.00	%			-			57,500	9/1/20	4.32	%
	Rosewood Morristown, L.L.C. / Metropolitan at 40 Park  (c) (d)	130	units	12.50	%			6,127			46,217	(e)	(e)
	Overlook Ridge JV, L.L.C./ Quarrystone  (b) (f)	251	units	50.00	%			-			69,580	(g)	(g)
	Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B  (b) (f)	371	units	50.00	%			2,753			47,872	12/26/15	L+2.50	%	(h)
	PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial   (b)	316	units	25.00	%			1,332			79,053	7/15/21	6.00	%	(i)
	Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)  (b)	355	units	7.50	%			-			79,266	6/27/16	L+2.10	%	(j)
	Crystal House Apartments Investors LLC / Crystal House  (k)	828	units	25.00	%			26,602			165,000	4/1/20	3.17	%
	Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7  (b)	176	units	38.25	%			2,306			32,693	12/4/15	L+2.50	%	(l)
	PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13  (b)	280	units	20.00	%			1,402			37,355	6/27/16	L+2.15	%	(m)
	Roseland/Port Imperial Partners, L.P./ Riverwalk C  (b) (n)	363	units	20.00	%			1,849			-	-	-
	RoseGarden Marbella South, L.L.C./ Marbella II	311	units	24.27	%			9,612			19,626	3/30/17	L+2.25	%	(o)
	Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)  (b)	227	units	7.50	%			-			30,830	1/25/17	L+2.10	%	(p)
	Riverpark at Harrison I, L.L.C./ Riverpark at Harrison	141	units	36.00	%			4,556			17,446	6/27/16	L+2.35	%	(q)
	Capitol Place Mezz LLC / Station Townhouses	377	units	50.00	%			48,682			55,414	7/1/33	4.82	%	(r)
	Harborside Unit A Urban Renewal, L.L.C. / URL Harborside  (ab)	763	units	85.00	%			28,080			-	8/1/29	5.197	%	(aa)
	RoseGarden Monaco, L.L.C./ San Remo Land	300	potential units	41.67	%			1,269			-	-	-
	Grand Jersey Waterfront URA, L.L.C./ Liberty Landing	1,000	potential units	50.00	%			337			-	-	-
	Office
	Red Bank Corporate Plaza, L.L.C./ Red Bank	92,878	sf	50.00	%			3,880			16,054	5/17/16	L+3.00	%	(s)
	12 Vreeland Associates, L.L.C./ 12 Vreeland Road	139,750	sf	50.00	%			5,680			14,124	7/1/23	2.87	%
	BNES Associates III / Offices at Crystal Lake	106,345	sf	31.25	%			2,026			6,907	11/1/23	4.76	%
	Hillsborough 206 Holdings, L.L.C./ Hillsborough 206	160,000	sf	50.00	%			1,962			-	-	-
	KPG-P 100 IMW JV, LLC / 100 Independence Mall West	339,615	sf	33.33	%			339			61,500	9/9/16	L+7.00	%	(t)
	Keystone-Penn	1,842,820	sf	(u)				-			201,606	(v)	(v)
	Keystone-TriState	1,266,384	sf	(w)				5,725			204,548	(x)	(x)
	KPG-MCG Curtis JV, L.L.C./ Curtis Center  (ac)	885,000	sf	50.00	%			60,440			(ae)	(ae)	(ae)
	Other
	Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)	1,225,000	sf	50.00	%			3,922			-	-	-
	Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial  (b)	30,745	sf	20.00	%			1,849			-	-	-
	South Pier at Harborside / Hyatt Regency Jersey City on the Hudson	350	rooms	50.00	%			-			65,974	(y)	(y)
	Stamford SM LLC / Senior Mezzanine Loan  (z)	n/a	n/a	80.00	%			-			-	-	-
	Other (ad)							540			-	-	-
	Totals:						$	239,767		$	1,607,411
		(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)		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").
		(d)		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, 2014), and is not expected to meaningfully participate in the venture's cash flows in the near term.
		(e)		Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600 at September 30, 2014, bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500 at September 30, 2014, bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117, bears interest at LIBOR plus 250 basis points and matures in September 2015.  The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved.
		(f)		On August 15, 2014, the Company acquired the equity interests of its joint venture partner in Overlook Ridge JV 2C/3B, L.L.C. for $2.97 million and LR Overlook Phase II, L.L.C., the property-owning entity owned by Overlook Ridge JV, L.L.C., which increased its ownership to 50 percent in two  operating multi-family properties.  The Company also acquired the equity interests of its joint venture partner in LR Overlook Phase III, L.L.C. and  Overlook Ridge, L.L.C. for $0.6 million and $12.99 million respectively, which increased its ownership to 100 percent in developable land (See Note 3: Real Estate Transactions – Acquisitions).
		(g)		Property debt balance consists of: (i) the senior loan, collateralized by the Quarrystone property, with a balance of $52,580 at September 30, 2014, bears interest at LIBOR plus 200 basis, matures in March 2016   and (ii) the junior loan, with a balance of $17,000, bears interest at LIBOR plus 90 basis points, matures in March 2016 and is collateralized by a $17,000 letter of credit provided by an affiliate of the partner.
		(h)		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.
		(i)		The construction loan has a maximum borrowing amount of $83,113.
		(j)		The construction loan has a maximum borrowing amount of $91,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.
		(k)		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.
		(l)		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.
		(m)		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.
		(n)		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.
		(o)		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.
		(p)		The construction loan has a maximum borrowing amount of $57,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.
		(q)		The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one-year extension options with a fee of 20 basis points for each year.
		(r)		The construction/permanent  loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017.
		(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 reserve with a balance of $16.8 million at September 30, 2014.
		(u)		The Company’s equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.
		(v)		Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $63,581 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 $6.5 million in five properties and Company’s subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return (“IRR”) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally (See Note 3: Real Estate Transactions – Sales).
	(x)		Principal balance of $41,240 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $70,608 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)		Balance includes: (i) mortgage loan, collateralized by the hotel property, with  a balance of $61,850, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $4.1 million, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020.  The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner.
	(z)		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.
	(aa)		The construction/permanent loan has a maximum borrowing amount of $192,000.
(ab)See discussion in Recent Transactions following in this footnote.
(ac)Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12.  See discussion in Recent Transactions following in this footnote.
(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.
(ae) See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.
Summary Of Financial Position Of Unconsolidated Joint Ventures	'
				September 30,			December 31,
				2014			2013
	Assets:
	Rental property, net		$	1,404,929		$	755,049
	Loan receivable			-			45,050
	Other assets			445,127			582,990
	Total assets		$	1,850,056		$	1,383,089
	Liabilities and partners'/
	members' capital:
	Mortgages and loans payable		$	992,434		$	637,709
	Other liabilities			221,414			87,231
	Partners'/members' capital			636,208			658,149
	Total liabilities and
	partners'/members' capital		$	1,850,056		$	1,383,089
Summary Of Company's Investment In Unconsolidated Joint Ventures	'
			September 30,			December 31,
	Entity / Property Name		2014			2013
	Multi-family
	Marbella RoseGarden, L.L.C./ Marbella	$	15,784		$	15,797
	RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)		2,438			3,201
	Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station		275			857
	PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial		-			-
	Rosewood Morristown, L.L.C. / Metropolitan at 40 Park		6,127			6,455
	Overlook Ridge JV, L.L.C./ Quarrystone		-			-
	Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B		2,753			-
	PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial		1,332			3,117
	Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)		-			203
	Crystal House Apartments Investors LLC / Crystal House		26,602			26,838
	Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7		2,306			3,207
	PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13		1,402			2,206
	Roseland/Port Imperial Partners, L.P./ Riverwalk C		1,849			2,068
	RoseGarden Marbella South, L.L.C./ Marbella II		9,612			7,567
	Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)		-			24
	Riverpark at Harrison I, L.L.C./ Riverpark at Harrison		4,556			3,655
	Capitol Place Mezz LLC / Station Townhouses		48,682			46,628
	Harborside Unit A Urban Renewal, L.L.C. / URL Harborside		28,080			-
	RoseGarden Monaco, L.L.C./ San Remo Land		1,269			1,224
	Grand Jersey Waterfront URA, L.L.C./ Liberty Landing		337			337
	Office
	Red Bank Corporate Plaza, L.L.C./ Red Bank		3,880			4,046
	12 Vreeland Associates, L.L.C./ 12 Vreeland Road		5,680			5,514
	BNES Associates III / Offices at Crystal Lake		2,026			1,753
	Hillsborough 206 Holdings, L.L.C./ Hillsborough 206		1,962			1,962
	KPG-P 100 IMW JV, LLC / 100 Independence Mall West		339			1,887
	Keystone-Penn		-			-
	Keystone-TriState		5,725			-
	KPG-MCG Curtis JV, L.L.C. / Curtis Center		60,440			-
	Other
	Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)		3,922			3,702
	Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial		1,849			1,930
	South Pier at Harborside / Hyatt Regency Jersey City on the Hudson (a)		-			-
	Stamford SM LLC / Senior Mezzanine Loan		-			36,258
	Other		540			693
	Company's investment in unconsolidated joint ventures	$	239,767		$	181,129
		(a)		The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.
Summary Of The Results Of Operations Of Unconsolidated Joint Ventures	'
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Total revenues	$	80,711		$	99,117		$	224,822		$	202,810
	Operating and other expenses		-58,684			-48,621			-173,642			-137,889
	Depreciation and amortization		-15,134			-11,556			-31,715			-24,730
	Interest expense		-11,296			-3,934			-26,423			-9,256
	Net income (loss)	$	-4,403		$	35,006		$	-6,958		$	30,935
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		2014			2013			2014			2013
	Multi-family
	Marbella RoseGarden, L.L.C./ Marbella	$	3		$	-170		$	-13		$	-446
	RoseGarden Monaco Holdings, L.L.C./ Monaco (North and South)		-249			-416			-764			-1,238
	Rosewood Lafayette Holdings, L.L.C./ Highlands at Morristown Station		-221			-295			-639			-869
	PruRose Port Imperial South 15, LLC /RiversEdge at Port Imperial		-			-			-			-606
	Rosewood Morristown, L.L.C. / Metropolitan at 40 Park		-90			-152			-264			-393
	Overlook Ridge JV, L.L.C./ Quarrystone		-			-			-			-
	Overlook Ridge JV 2C/3B, L.L.C./Overlook Ridge 2C & 3B		-217			53			-155			204
	PruRose Riverwalk G, L.L.C./ RiverTrace at Port Imperial		-615			-198			-1,766			-576
	Elmajo Urban Renewal Associates, LLC / Lincoln Harbor (Bldg A&C)		-			-87			-203			-255
	Crystal House Apartments Investors LLC / Crystal House		68			-1,149			-206			-2,671
	Portside Master Company, L.L.C./ Portside at Pier One - Bldg 7		-228			-109			-661			-222
	PruRose Port Imperial South 13, LLC / Port Imperial Bldg 13		-220			-181			-638			-459
	Roseland/Port Imperial Partners, L.P./ Riverwalk C		-173			-			-518			-
	RoseGarden Marbella South, L.L.C./ Marbella II		-			-20			-			-57
	Estuary Urban Renewal Unit B, LLC / Lincoln Harbor (Bldg B)		-			-44			-15			-107
	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		-			-			-212			-
	RoseGarden Monaco, L.L.C./ San Remo Land		-			-			-			-
	Grand Jersey Waterfront URA, L.L.C./ Liberty Landing		-			-			-54			-
	Office
	Red Bank Corporate Plaza, L.L.C./ Red Bank		101			99			306			306
	12 Vreeland Associates, L.L.C./ 12 Vreeland Road		22			-25			165			-1
	BNES Associates III / Offices at Crystal Lake		127			-37			273			-108
	Hillsborough 206 Holdings, L.L.C./ Hillsborough 206		-			-			-5			-
	KPG-P 100 IMW JV, LLC / 100 Independence Mall West		-412			-			-1,548			-
	Keystone-Penn		-			-			-			-
	Keystone-TriState		-733			-			-733			-
	KPG-MCG Curtis JV, L.L.C./ Curtis Center		113			-			364			-
	Other
	Plaza VIII & IX Associates, L.L.C./ Vacant land (parking operations)		74			24			220			52
	Roseland/North Retail, L.L.C./ Riverwalk at Port Imperial		-34			-62			-81			-194
	South Pier at Harborside / Hyatt Regency Jersey City on the Hudson		583			835			1,874			1,380
	Stamford SM LLC / Senior Mezzanine Loan		493			1,023			2,337			2,805
	Other		340			682			876			1,396
	Company's equity in earnings (loss) of unconsolidated joint ventures	$	-1,268		$	-229		$	-2,060		$	-2,059

Deferred_Charges_Goodwill_And_1

Deferred Charges, Goodwill And Other Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Deferred Charges, Goodwill And Other Assets [Abstract]	'
Schedule Of Deferred Charges, Goodwill And Other Assets	'
			September 30,			December 31,
	(dollars in thousands)		2014			2013
	Deferred leasing costs	$	226,605		$	258,648
	Deferred financing costs		24,689			25,366
			251,294			284,014
	Accumulated amortization		-115,620			-131,669
	Deferred charges, net		135,674			152,345
	Notes receivable (1)		73,828			21,986
	In-place lease values, related intangibles and other assets, net		7,566			13,659
	Goodwill		2,945			2,945
	Prepaid expenses and other assets, net (2)		100,383			27,584
	Total deferred charges, goodwill and other assets	$	320,396		$	218,519
		-1		Includes as of September 30, 2014: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent; a note receivable for $7.8 million which bears interest at eight percent; an interest-free note receivable with a net present value of $3.4 million and a note receivable for $52.3 million which bore interest at 3.5 percent (which was repaid in full on October 1, 2014).
		-2		Includes a receivable of $61.9 million related to the completion of the Curtis Center mortgage loan financing on September 30, 2014 for which the Company received its loan proceeds on October 1, 2014.  See Note 10: Mortgages, Loans Payable and Other Obligations.

Restricted_Cash_Tables

Restricted Cash (Tables)	9 Months Ended
	Sep. 30, 2014
Restricted Cash [Abstract]	'
Schedule Of Restricted Cash	'
			September 30,		December 31,
			2014		2013
	Security deposits	$	7,594	$	8,534
	Escrow and other reserve funds		18,977		11,260
	Total restricted cash	$	26,571	$	19,794

Discontinued_Operations_Tables

Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2014
Discontinued Operations [Abstract]	'
Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses)	'
		Three Months Ended		Nine Months Ended
			September 30,	September 30,
			2013		2013
	Total revenues	$	6,405	$	33,610
	Operating and other expenses		-2,472		-13,454
	Depreciation and amortization		-1,769		-8,196
	Interest expense		-		-118
	Income from discontinued operations		2,164		11,842
	Loss from early extinguishment of debt		-		-703
	Impairments (1)		-		-23,851
	Realized gains on disposition of rental property		47,321		84,930
	Realized gains (losses) on disposition
	of rental property and impairments, net		47,321		61,079
	Total discontinued operations	$	49,485	$	72,218
	(1)Represents impairment charges recorded on certain properties prior to their sale.

Senior_Unsecured_Notes_Tables

Senior Unsecured Notes (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary Of Senior Unsecured Notes	'
			September 30,		December 31,	Effective
			2014		2013	Rate (1)
	5.125% Senior Unsecured Notes, due February 15, 2014 (2)		-	$	200,030	5.110	%
	5.125% Senior Unsecured Notes, due January 15, 2015	$	149,971		149,902	5.297	%
	5.800% Senior Unsecured Notes, due January 15, 2016		200,104		200,161	5.806	%
	2.500% Senior Unsecured Notes, due  December 15, 2017		249,077		248,855	2.803	%
	7.750% Senior Unsecured Notes, due August 15, 2019		248,959		248,799	8.017	%
	4.500% Senior Unsecured Notes, due April 18, 2022		299,550		299,505	4.612	%
	3.150% Senior Unsecured Notes, due May 15, 2023		269,778		269,323	3.517	%
	Total senior unsecured notes	$	1,417,439	$	1,616,575
	(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.
	(2)On February 17, 2014, the Company repaid these notes at their maturity using available cash and borrowings on the Company’s unsecured revolving credit facility.

Unsecured_Revolving_Credit_Fac1

Unsecured Revolving Credit Facility (Tables)	9 Months Ended
	Sep. 30, 2014
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	170.0	35.0
	BBB- or Baa3	130.0	30.0
	BBB or Baa2(current)	110.0	20.0
	BBB+ or Baa1	100.0	15.0
	A- or A3 or higher	92.5	12.5

Mortgages_Loans_Payable_And_Ot1

Mortgages, Loans Payable And Other Obligations (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary Of Mortgages, Loans Payable And Other Obligations	'
				Effective				September 30,			December 31,
	Property Name	Lender		Rate (a)				2014			2013	Maturity
	6301 Ivy Lane (b)	RGA Reinsurance Company		5.520	%		$	-		$	5,447	-
	395 West Passaic (c)	State Farm Life Insurance Co.		6.004	%			-			9,719	-
	35 Waterview Boulevard (d)	Wells Fargo CMBS		6.348	%			-			18,417	-
	233 Canoe Brook Road (e)	The Provident Bank		4.375	%			-			3,877	-
	6 Becker, 85 Livingston,	Wells Fargo CMBS		10.220	%			65,035			64,233	8/11/14	(o)
	75 Livingston &
	20 Waterview (f)
	4 Sylvan	Wells Fargo CMBS		10.190	%			14,575			14,538	8/11/14	(o)
	10 Independence (g)	Wells Fargo CMBS		12.440	%			16,924			16,638	8/11/14	(g)
	Port Imperial South 4/5	Wells Fargo Bank N.A.	LIBOR+3.50		%			36,950			36,950	10/31/14	(q)
	Overlook - Site IIID,IIIC, IIIA (p)	Wells Fargo Bank N.A.	LIBOR+3.50		%			17,100			-	3/2/15
	Overlook - Site IIB (Quarrystone I) (p)	Wells Fargo Bank N.A.	LIBOR+2.50		%			5,748			-	4/14/15
	9200 Edmonston Road (h)	Principal Commercial Funding L.L.C.		5.534	%			3,996			4,115	5/1/15
	Port Imperial South	Wells Fargo Bank N.A.	LIBOR+1.75		%			43,910			43,278	9/19/15
	4 Becker	Wells Fargo CMBS		9.550	%			39,268			38,820	5/11/16
	5 Becker (i)	Wells Fargo CMBS		12.830	%			13,666			13,092	5/11/16
	210 Clay	Wells Fargo CMBS		13.420	%			13,182			12,767	5/11/16
	Curtis Center (j)	CCRE & PREFG	LIBOR+4.55		%	(m)		64,000			-	10/9/16
	Various (k)	Prudential Insurance		6.332	%			146,048			147,477	1/15/17
	150 Main St.	Webster Bank	LIBOR+2.35		%			218			-	3/30/17
	23 Main Street	JPMorgan CMBS		5.587	%			29,373			29,843	9/1/18
	Harborside Plaza 5	The Northwestern Mutual Life		6.842	%			222,480			225,139	11/1/18
		Insurance Co. & New York Life
		Insurance Co.
	100 Walnut Avenue	Guardian Life Insurance Co.		7.311	%			18,606			18,792	2/1/19
	One River Center (l)	Guardian Life Insurance Co.		7.311	%			42,623			43,049	2/1/19
	Park Square	Wells Fargo Bank N.A.	LIBOR+1.75		%	(n)		27,500			-	4/10/19
	Total mortgages, loans payable and other obligations						$	821,202		$	746,191
		(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 April 1, 2014, the Company repaid the mortgage loan at par, using available cash.
		(c)		On May 1, 2014, the Company repaid the mortgage loan at par, using available cash.
		(d)		On May 12, 2014, the Company repaid the mortgage loan at par, using borrowings on the Company’s unsecured revolving credit facility.
		(e)		On April 30, 2014, the Company repaid the mortgage loan at par, using available cash.
		(f)		Mortgage is cross collateralized by the four properties.
		(g)		The Company is negotiating a deed-in-lieu of foreclosure in satisfaction of this mortgage loan.
		(h)		The mortgage loan originally matured on May 1, 2013.  The maturity date was extended until May 1, 2015 with the same interest rate.  Excess cash flow, as defined, is being held by the lender for re-leasing costs.  The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity.
		(i)		The cash flow from this property is insufficient to cover operating costs and debt service.  Consequently, the Company notified the lender and suspended debt service payments in August 2013.  The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013.
		(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 3.45 percent at September 30, 2014 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.65 percent at September 30, 2014.  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.  Both loans have LIBOR caps for the period.  The loans provide for three one-year extension options.  As the Curtis Center Property loans closed on September 30, 2014 with the loan proceeds received on October 1, 2014, the Company recorded the loan and a receivable on September 30, 2014.  See Note 5: Deferred Charges, Goodwill and Other Assets.
		(k)		Mortgage is cross collateralized by seven properties.  The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.
		(l)		Mortgage is collateralized by the three properties comprising One River Center.
		(m)		Amortization of deferred financing costs adds 1.523 percent to the variable interest rate stated above.
		(n)		Amortization of deferred financing costs adds 0.122 percent to the variable interest rate stated above.
	(o)The Company has begun discussions with the lender regarding the past due maturity of the loans.
	(p)On August 15, 2014, the Company assumed these loans as a result of its acquisition of interests which increased its ownership to 100 percent in certain previously unconsolidated joint ventures which owned developable land.
	(q)The Company is pursuing permanent financing at the maturity of the construction financing in October 2014.
Summary Of Notional Fair Value Of Derivative Financial Instruments	'
			Notional			Strike			Effective		Expiration
			Value	(a)		Rate			Date		Date		Fair Value
	LIBOR Cap	$	51,000			1.5	%		Sep-14		Oct-15	$	4
	LIBOR Cap		24,000			1.5	%		Sep-14		Oct-15		2
	LIBOR Cap		51,000			1.75	%		Oct-15		Oct-16		115
	LIBOR Cap		24,000			1.75	%		Oct-15		Oct-16		53
												$	174
		(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.

MackCali_Realty_LPs_Partners_C1

Mack-Cali Realty, L.P's Partners' Capital (Tables)	9 Months Ended
	Sep. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'
Schedule Of Stock Option Plans	'
					Weighted			Aggregate
					Average			Intrinsic
		Shares			Exercise			Value
		Under Options			Price			$(000’s)
	Outstanding at January 1, 2014	15,000		$	40.54		$	-
	Granted	5,000			21.25
	Lapsed or Cancelled	-10,000			38.07
	Outstanding at September 30, 2014  ($21.25 – $45.47)	10,000		$	33.36		$	-
	Options exercisable at September 30, 2014	5,000
	Available for grant at September 30, 2014	4,466,143
Schedule Of Weighted Average Assumptions	'
	Expected life (in years)		6
	Risk-free interest rate		1.50	%
	Volatility		20.26	%
	Dividend yield		5.65	%
Schedule Of Restricted Stock Awards	'
					Weighted-Average
					Grant – Date
		Shares			Fair Value
	Outstanding at January 1, 2014 (a)	153,560		$	25.20
	Granted (b)	208,589			20.83
	Vested	-183,214			22.37
	Forfeited	-119			26.36
	Outstanding at September 30, 2014	178,816		$	23.00
	(a)Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent years’ performance goals are met.
	(b)Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014.  Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.
Schedule Of Basic And Diluted Earnings Per Unit	'
				Three Months Ended						Nine Months Ended
				September 30,						September 30,
	Computation of Basic EPU			2014			2013			2014		2013
	Income (loss) from continuing operations		$	2,085		$	-46,046		$	41,804	$	-29,506
	Add: Noncontrolling interest in consolidated joint ventures			145			1,838			757		1,962
	Income (loss) from continuing operations available to common unitholders			2,230			-44,208			42,561		-27,544
	Income from discontinued operations available to common
	unitholders			-			49,485			-		72,218
	Net income (loss) available to common unitholders		$	2,230		$	5,277		$	42,561	$	44,674
	Weighted average common units			99,995			99,787			99,955		99,778
	Basic EPU:
	Income (loss) from continuing operations available to common unitholders		$	0.02		$	-0.44		$	0.43	$	-0.28
	Income from discontinued operations available to common
	unitholders			-			0.49			-		0.73
	Net income (loss) available to common unitholders		$	0.02		$	0.05		$	0.43	$	0.45
				Three Months Ended						Nine Months Ended
				September 30,						September 30,
	Computation of Diluted EPU			2014			2013			2014		2013
	Income (loss) from continuing operations available to common unitholders		$	2,230		$	-44,208		$	42,561	$	-27,544
	Income from discontinued operations for diluted earnings
	per unit			-			49,485			-		72,218
	Net income (loss) available to common unitholders		$	2,230		$	5,277		$	42,561	$	44,674
	Weighted average common unit			100,052			99,787			100,014		99,778
	Diluted EPU:
	Income (loss) from continuing operations available to common unitholders		$	0.02		$	-0.44		$	0.43	$	-0.28
	Income from discontinued operations available to common
	unitholders			-			0.49			-		0.73
	Net income (loss) available to common unitholders		$	0.02		$	0.05		$	0.43	$	0.45
	The following schedule reconciles the units used in the basic EPU calculation to the units used in the diluted EPU calculation: (in thousands)
		Three Months Ended			Nine Months Ended
		September 30,			September 30,
		2014	2013		2014	2013
	Basic EPU units	99,995	99,787		99,955	99,778
	Add:   Restricted Stock Awards	57	-		59	-
	Diluted EPU units	100,052	99,787		100,014	99,778

Noncontrolling_Interest_In_Con

Noncontrolling Interest In Consolidated Joint Ventures (Tables)	9 Months Ended
	Sep. 30, 2014
Noncontrolling Interests In Consolidated Joint Ventures [Abstract]	'
Schedule Of Activity Of Noncontrolling Interests	'
			Nine Months Ended
			September 30,
			2014		2013
	Balance at January 1	$	55,283	$	56,442
	Net income		-757		-1,962
	Increase in noncontrolling interest		487		1,570
	Balance at September 30	$	55,013	$	56,050

Commitments_And_Contingencies_

Commitments And Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments And Contingencies [Abstract]	'
Future Minimum Rental Payments Of Ground Leases	'
	Year		Amount
	October 1 through December 31, 2014	$	92
	2015		371
	2016		371
	2017		267
	2018		232
	2019 through 2084		15,818
	Total	$	17,151

Tenant_Leases_Tables

Tenant Leases (Tables)	9 Months Ended
	Sep. 30, 2014
Tenant Leases [Abstract]	'
Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases	'
	Year		Amount
	October 1 through December 31, 2014	$	118,687
	2015		445,922
	2016		408,691
	2017		357,819
	2018		276,297
	2019 and thereafter		1,067,223
	Total	$	2,674,639

Segment_Reporting_Tables

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2014
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:
	30-Sep-14	$	142,486	$	6,459	$	8,300	(e)		$	-1,756	$	155,489
	30-Sep-13		155,129		3,736		6,867	(f)			-3,227		162,505
	Nine months ended:
	30-Sep-14		447,779		18,593		22,650	(g)			-3,637		485,385
	30-Sep-13		469,026		8,673		18,745	(h)			5,320		501,764
	Total operating and
	interest expenses (a):
	Three months ended:
	30-Sep-14	$	69,315	$	3,271	$	10,249			$	27,582	$	110,417
	30-Sep-13		71,356		1,960		8,214				31,998		113,528
	Nine months ended:
	30-Sep-14		226,798		8,976		28,790				100,126		364,690
	30-Sep-13		207,637		4,066		23,345				110,341		345,389
	Equity in earnings (loss) of
	unconsolidated joint ventures:
	Three months ended:
	30-Sep-14	$	328	$	-2,088	$	492			$	-	$	-1,268
	30-Sep-13		1,919		-2,830		682				-		-229
	Nine months ended:
	30-Sep-14		3,145		-6,566		1,361				-		-2,060
	30-Sep-13		5,149		-7,890		682				-		-2,059
	Net operating income (loss) (b):
	Three months ended:
	30-Sep-14	$	73,499	$	1,100	$	-1,457			$	-29,338	$	43,804
	30-Sep-13		85,692		-1,054		-665				-35,225		48,748
	Nine months ended:
	30-Sep-14		224,126		3,051		-4,779				-103,763		118,635
	30-Sep-13		266,538		-3,283		-3,918				-105,021		154,316
	Total assets:
	30-Sep-14	$	3,861,779	$	460,998	$	10,648			$	23,772	$	4,357,197
	31-Dec-13		3,886,574		377,237		10,488				241,029		4,515,328
	Total long-lived assets (c):
	30-Sep-14	$	3,333,851	$	315,841	$	3,909			$	3,438	$	3,657,039
	31-Dec-13		3,620,494		240,501		3,468				3,730		3,868,193
	Total investments in
	unconsolidated joint ventures:
	30-Sep-14	$	82,012	$	157,215	$	540			$	-	$	239,767
	31-Dec-13		53,160		127,276		693				-		181,129
	(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 income, (including for property-level mortgages) is excluded from segment amounts and classified in Corporate & Other for all periods.
	(b)Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.
	(c)Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill.
	(d)Corporate & Other represents all corporate-level items (including interest and other investment income, interest expense, non-property general and administrative expense, construction services revenue and direct construction costs) as well as intercompany eliminations necessary to reconcile to consolidated Company totals.
	(e)Includes $1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(f)Includes $665 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(g)Includes $2,962 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	(h)Includes $1,432 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
	The following schedule reconciles net operating income to net income available to common unitholders: (dollars in
	thousands)
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014			2013
	Net operating income	$	43,804	$	48,748	$	118,635		$	154,316
	Less:
	Depreciation and amortization		-41,983		-46,094		-131,679			-135,122
	Realized gains  on disposition of
	rental property, net		264		-		54,848			-
	Impairments				-48,700					-48,700
	Income (loss) from continuing operations		2,085		-46,046		41,804			-29,506
Discontinued operations:
Income from discontinued operations		-		2,164		-			11,842
Loss from early extinguishment of debt		-		-		-			-703
Realized gains  on disposition of
rental property, net		-		47,321		-			61,079
Total discontinued operations		-		49,485		-			72,218
Net income		2,085		3,439		41,804			42,712
Noncontrolling interest in consolidated joint ventures		145		1,838		757			1,962
Net income available to common unitholders	$	2,230	$	5,277	$	42,561		$	44,674

Organization_And_Basis_Of_Pres1

Organization And Basis Of Presentation (Details) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
	sqft
	state
	property
Real Estate Properties [Line Items]	'	'
Percentage of ownership interest	88.90%	88.10%
Number of properties owned or investment interests	282	'
Aggregate square feet of the property owned or investment interest	31,500,000	'
Number of states where properties are located	7	'
Consolidated joint ventures, total real estate assets	$237.70	$219.90
Consolidated joint ventures, mortgages	90	81.9
Consolidated joint ventures, other liabilities	$17	$18.30
Commercial Properties [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	266	'
Number of tenants	2,000	'
Multi-Family Properties [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	16	'
Number of units	4,940	'
Office And Office/Flex Buildings [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	251	'
Aggregate square feet of the property owned or investment interest	31,000,000	'
Industrial/Warehouse Facilities [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	6	'
Aggregate square feet of the property owned or investment interest	387,400	'
Unconsolidated Joint Venture Multi-Family Properties [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	10	'
Number of units	3,639	'
Unconsolidated Joint Venture Office Buildings [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	37	'
Aggregate square feet of the property owned or investment interest	6,000,000	'
Parking/Retail [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	5	'
Aggregate square feet of the property owned or investment interest	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	81,500	'
Unconsolidated Joint Venture Hotel [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	1	'
Number of units	350	'
Land [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of properties owned or investment interests	3	'

Significant_Accounting_Policie3

Significant Accounting Policies (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Oct. 03, 2014	Jan. 06, 2014
Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'
Capitalized development and construction salaries and other related costs	$1,000,000	'	$1,900,000	$2,700,000	$3,700,000	'	'
Construction, tenant improvement, and development in-progress	58,800,000	40,800,000	'	58,800,000	'	'	'
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	778,000	'	954,000	2,306,000	2,379,000	'	'
Deferred leasing costs	940,000	'	962,000	2,816,000	3,168,000	'	'
Provision or benefit for income taxes	'	'	'	0	'	'	'
Deferred tax asset	14,100,000	'	'	14,100,000	'	'	'
General and limited partners common capital account units outstanding	'	'	'	'	'	99,907,400	99,792,777
Distributions payable, record date	3-Oct-14	6-Jan-14	'	'	'	'	'
Common unit distributions per common unit, declared	$0.15	$0.30	'	'	'	'	'
Distributions payable date	10-Oct-14	15-Jan-14	'	'	'	'	'
Restricted stock expense	830,000	'	641,000	5,094,000	1,947,000	'	'
Difference between other comprehensive income and net income	0	'	0	0	0	'	'
Accumulated other comprehensive income	0	0	'	0	'	'	'
Executive Officer [Member]	'	'	'	'	'	'	'
Significant Accounting Policies [Line Items]	'	'	'	'	'	'	'
Restricted stock expense	'	'	'	$3,150,000	'	'	'

Significant_Accounting_Policie4

Significant Accounting Policies (Estimated Useful Lives Of Assets) (Details)	9 Months Ended
	Sep. 30, 2014
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

Real_Estate_Transactions_Narra

Real Estate Transactions (Narrative) (Details) (USD $)	9 Months Ended	0 Months Ended		9 Months Ended		0 Months Ended			0 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Apr. 10, 2014	Aug. 15, 2014	Sep. 30, 2014	Sep. 30, 2014	Aug. 15, 2014	Aug. 15, 2014	Aug. 15, 2014	Aug. 15, 2014	Aug. 15, 2014
		Andover Place [Member]	Overlook Ridge Properties [Member]	Curtis Center [Member]	Multi-Family Properties [Member]	Multi-Family Properties [Member]	Multi-Family Properties [Member]	Consolidated Land [Member]	Consolidated Land [Member]	Consolidated Land [Member]
		item			item	Overlook Ridge Properties [Member]	Overlook Ridge Properties [Member]	Overlook Ridge Properties [Member]	Overlook Ridge Properties [Member]	Overlook Ridge Properties [Member]
						property			Minimum [Member]	Maximum [Member]
Real Estate Properties [Line Items]	'	'	'	'	'	'	'	'	'	'
Number of units	'	220	'	'	4,940	'	'	'	'	'
Cash consideration	'	$37.70	$16.60	'	'	'	'	'	'	'
Percentage of interest in developable land	'	'	'	'	'	'	'	100.00%	'	'
Percentage of additional interest acquired	'	'	'	'	'	25.00%	'	'	'	'
Indirect ownership interest	'	'	'	50.00%	'	'	50.00%	'	'	'
Number of properties in which additional interest was acquired during period	'	'	'	'	'	2	'	'	'	'
Loans assumed	'	'	'	'	'	'	'	22.8	'	'
Spread over LIBOR	'	'	'	'	'	'	'	'	2.50%	3.50%
Transaction costs	1.9	'	'	'	'	'	'	'	'	'
Acquisition and other investment fundings handled by intermediary	$44.40	'	'	$40.10	'	'	'	'	'	'

Real_Estate_Transactions_Sched

Real Estate Transactions (Schedule Of Purchase Price Allocation) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Andover Place [Member]	'
Business Acquisition [Line Items]	'
Land	8,535
Buildings and improvements	27,609
Furniture, fixtures and equipment	459
In-place lease values	1,118
Total assets acquired	37,721
Less: Below market lease values	-25	[1]
Net cash paid at acquisition	37,696
In-Place And Below Market Leases [Member] | Maximum [Member]	'
Business Acquisition [Line Items]	'
Amortization period	'1 year
[1]	In-place lease values and below market lease values will be amortized over one year or less.

Real_Estate_Transactions_Sched1

Real Estate Transactions (Schedule Of Property Sales) (Details) (USD $)	3 Months Ended	9 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
		sqft			sqft
		item			property
		property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	16		'	24
Rentable Square Feet	'	2,610,931		'	3,000,000
Net Sales Proceeds	'	$319,239,000		'	$390,600,000
Net Book Value	'	264,391,000		'	'
Realized Gain (loss)	'	54,848,000		'	'
Impairment charge	48,700,000	'		48,700,000	'
22 Sylvan Way [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1		'	'
Rentable Square Feet	'	249,409		'	'
Net Sales Proceeds	'	94,897,000		'	'
Net Book Value	'	60,244,000		'	'
Realized Gain (loss)	'	34,653,000		'	'
30 Knightsbridge Road [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	4	[1]	'	'
Rentable Square Feet	'	680,350	[1]	'	'
Net Sales Proceeds	'	54,641,000	[1]	'	'
Net Book Value	'	52,361,000	[1]	'	'
Realized Gain (loss)	'	2,280,000	[1]	'	'
470 Chestnut Ridge Road [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1	[1],[2]	'	'
Rentable Square Feet	'	52,500	[1],[2]	'	'
Net Sales Proceeds	'	7,195,000	[1],[2]	'	'
Net Book Value	'	7,109,000	[1],[2]	'	'
Realized Gain (loss)	'	86,000	[1],[2]	'	'
530 Chestnut Ridge Road [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1	[1],[2]	'	'
Rentable Square Feet	'	57,204	[1],[2]	'	'
Net Sales Proceeds	'	6,299,000	[1],[2]	'	'
Net Book Value	'	6,235,000	[1],[2]	'	'
Realized Gain (loss)	'	64,000	[1],[2]	'	'
400 Rella Boulevard [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1		'	'
Rentable Square Feet	'	180,000		'	'
Net Sales Proceeds	'	27,539,000		'	'
Net Book Value	'	10,938,000		'	'
Realized Gain (loss)	'	16,601,000		'	'
412 Mt. Kemble Avenue [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1	[1]	'	'
Rentable Square Feet	'	475,100	[1]	'	'
Net Sales Proceeds	'	44,751,000	[1]	'	'
Net Book Value	'	43,851,000	[1]	'	'
Realized Gain (loss)	'	900,000	[1]	'	'
17-17 Rte 208 North [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1	[1],[2]	'	'
Rentable Square Feet	'	143,000	[1],[2]	'	'
Net Sales Proceeds	'	11,835,000	[1],[2]	'	'
Net Book Value	'	11,731,000	[1],[2]	'	'
Realized Gain (loss)	'	104,000	[1],[2]	'	'
555, 565, 570 Taxter Road [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	3	[1]	'	'
Rentable Square Feet	'	416,108	[1]	'	'
Net Sales Proceeds	'	41,057,000	[1]	'	'
Net Book Value	'	41,057,000	[1]	'	'
200, 220 White Plains Road [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	2	[1]	'	'
Rentable Square Feet	'	178,000	[1]	'	'
Net Sales Proceeds	'	12,619,000	[1]	'	'
Net Book Value	'	12,619,000	[1]	'	'
1266 East Main Street [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Number of Buildings	'	1	[1],[2]	'	'
Rentable Square Feet	'	179,260	[1],[2]	'	'
Net Sales Proceeds	'	18,406,000	[1],[2]	'	'
Net Book Value	'	18,246,000	[1],[2]	'	'
Realized Gain (loss)	'	160,000	[1],[2]	'	'
Keystone Portfolio [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Net Sales Proceeds	'	196,800,000		'	'
Sale price of property	'	221,000,000		'	'
Sale price of property, cash	'	192,500,000		'	'
Sale price of property, capital accounts	'	21,200,000		'	'
Closing costs paid	'	3,000,000		'	'
Ownership interest	'	0.00%		'	'
Number of properties with senior pari passu interest	'	5		'	'
Sale price of property, capital balance in properties in which senior pari passu interest is held	'	7,300,000		'	'
Impairment charge	'	'		'	$20,700,000
Keystone Portfolio [Member] | Keystone Entities [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Internal rate of return	'	15.00%		'	'
Keystone Portfolio [Member] | Parent Company [Member]	'	'		'	'
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'		'	'
Internal rate of return	'	10.00%		'	'
[1]	The Company completed the sale of these properties for approximately $221 million comprised of: $192.5 million in cash from a combination of affiliates of Keystone Property Group (bKeystone Entitiesb) senior and pari-passu equity and mortgage financing; Company subordinated equity interests in each of the properties sold with capital accounts aggregating $21.2 million and Company pari-passu equity interests in five of the properties sold aggregating $7.3 million. Net sale proceeds from the sale aggregated $196.8 million which was comprised of the $221 million gross sales price less the subordinated equity interests of $21.2 million and $3 million in closing costs. The purchasers of these properties are unconsolidated joint ventures formed between the Company and the Keystone Entities. The senior and pari-passu equity will receive a 15 percent internal rate of return (bIRRb) after which the subordinated equity will receive a 10 percent IRR and then all distributable cash flow will be split equally between the Keystone Entities and the Company. See Note 4: Investments in Unconsolidated Joint Ventures. In connection with certain of these partial sale transactions, because the buyer received a preferential return on certain of the ventures for which the Company received subordinated equity interests, the Company only recognized profit to the extent that they received net proceeds in excess of their entire carrying value of the properties, effectively reflecting their retained subordinated equity interest at zero.
[2]	The Company recorded an impairment charge of $20.7 million on these properties at December 31, 2013 as it estimated that the carrying value of the properties may not be recoverable over their anticipated holding periods.

Real_Estate_Transactions_Summa

Real Estate Transactions (Summary Of Income From Property Held For Sale) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Real Estate Properties [Line Items]	'	'	'	'
Total revenues	'	$6,405	'	$33,610
Operating and other expenses	'	-2,472	'	-13,454
Depreciation and amortization	'	-1,769	'	-8,196
Income from properties sold	'	2,164	'	11,842
Properties Sold, Year To Date [Member]	'	'	'	'
Real Estate Properties [Line Items]	'	'	'	'
Total revenues	2,763	13,672	28,824	41,965
Operating and other expenses	-1,957	-7,368	-17,248	-20,681
Depreciation and amortization	-502	-3,600	-6,371	-10,945
Interest income	2	'	4	'
Income from properties sold	$306	$2,704	$5,209	$10,339

Investments_In_Unconsolidated_2

Investments In Unconsolidated Joint Ventures (Narrative) (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
	entity			entity
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Company's investment in unconsolidated joint ventures	$239,767,000		'	$239,767,000		'	$181,129,000
Percentage of interest in venture	'	[1]	'	'	[1]	'	'
Management, leasing, development and other services fees	1,900,000		1,700,000	5,100,000		4,200,000	'
Accounts receivable from unconsolidated joint ventures	899,000		'	899,000		'	523,000
Number of VIEs	8		'	8		'	'
Maximum exposure to loss	207,400,000		'	207,400,000		'	'
Estimated future funding commitments	110,700,000		'	110,700,000		'	'
Unconsolidated Joint Ventures [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Maximum borrowing capacity	287,900,000		'	287,900,000		'	'
Outstanding borrowings under the facility	215,500,000		'	215,500,000		'	'
Unconsolidated Joint Venture Multi-Family Properties [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Number of properties	10		'	10		'	'
Number of units	3,639		'	3,639		'	'
Unconsolidated Joint Venture Retail Buildings [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Number of properties	2		'	2		'	'
Unconsolidated Joint Venture Land Parcels [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Area of property (in square feet)	1,400,000		'	1,400,000		'	'
Number of units	2,994		'	2,994		'	'
Unconsolidated Joint Venture Office Buildings [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Number of properties	36		'	36		'	'
Unconsolidated Joint Venture Office And Retail Buildings [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Area of property (in square feet)	5,700,000		'	5,700,000		'	'
Unconsolidated Joint Venture Development Projects [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Number of units	2,275		'	2,275		'	'
Unconsolidated Joint Venture Hotel [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Number of units	350		'	350		'	'
Parent Company [Member] | Unconsolidated Joint Ventures [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Maximum borrowing capacity	71,500,000		'	71,500,000		'	'
Outstanding borrowings under the facility	62,600,000		'	62,600,000		'	'
Minimum [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Percentage of interest in venture	7.50%		'	7.50%		'	'
Maximum [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Percentage of interest in venture	85.00%		'	85.00%		'	'
Variable Interest Entity [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Company's investment in unconsolidated joint ventures	96,700,000		'	96,700,000		'	'
South Pier At Harborside [Member]	'		'	'		'	'
Schedule of Equity Method Investments [Line Items]	'		'	'		'	'
Company's investment in unconsolidated joint ventures	'	[2]	'	'	[2]	'	'	[2]
Number of units	350		'	350		'	'
Percentage of interest in venture	50.00%	[1]	'	50.00%	[1]	'	'
Letter of credit	$4,100,000		'	$4,100,000		'	'
[1]	Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.
[2]	The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.

Investments_In_Unconsolidated_3

Investments In Unconsolidated Joint Ventures (Recent Transactions) (Narrative) (Details) (USD $)

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

21-May-14

Aug. 01, 2014

Sep. 30, 2014

Aug. 01, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Oct. 01, 2014

Jun. 06, 2014

Sep. 02, 2014

Jun. 06, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

KPG-MCG Curtis JV, LLC [Member]

KPG-MCG Curtis JV, LLC [Member]

90-Day Loan 1 [Member]

90-Day Loan 1 [Member]

90-Day Loan 2 [Member]

90-Day Loan 2 [Member]

Harborside Residential Project [Member]

Harborside Residential Project [Member]

Curtis Center Property [Member]

Curtis Center Property [Member]

Curtis Center Property [Member]

Curtis Center Property [Member]

Land [Member]

item

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Parent Company [Member]

Ironstate Harborside-A, LLC [Member]

Keystone Property Group [Member]

sqft

Parent Company [Member]

Keystone Property Group [Member]

Keystone Property Group [Member]

Keystone Property Group [Member]

Keystone Property Group [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Parent Company [Member]

Keystone Property Group [Member]

KPG-MCG Curtis JV, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

item

Parent Company [Member]

Parent Company [Member]

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of units

'

'

'

763

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

763

'

'

'

'

'

'

Total project costs

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$320,000,000

$65,600,000

'

'

'

'

'

State tax credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33,000,000

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

192,000,000

192,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan maturity date

'

'

'

'

'

1-Aug-29

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of interest in venture

'

'

'

85.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investments in unconsolidated joint ventures

239,767,000

'

181,129,000

28,080,000

[1]

30,600,000

'

'

'

'

5,400,000

'

60,440,000

[2]

'

'

'

'

'

'

'

125,000,000

62,500,000

62,500,000

'

5,500,000

Capital credit receivable per developable square foot

'

'

'

30

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate capital credits

'

'

'

20,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Development of rental property

4,881,000

12,954,000

'

12,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of operating return on capital

'

'

'

'

'

'

'

'

75.00%

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Internal rate of return

'

'

'

'

'

'

'

'

18.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of capital event cash flows distributed after initial internal rate of return reached

'

'

'

'

'

'

'

'

65.00%

35.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of interest in venture

'

[3]

'

'

85.00%

[1],[3]

'

'

'

'

'

'

50.00%

50.00%

[2],[3]

50.00%

'

'

'

'

'

'

'

50.00%

50.00%

'

'

Square Feet

'

'

'

'

'

'

'

'

'

'

'

885,000

[2]

'

'

'

'

'

'

'

'

'

'

'

'

Maturity period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'90 days

'

'90 days

'

'

'

'

'

'

'

Loan to affiliate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

52,300,000

'

10,000,000

'

'

'

'

'

'

'

Interest rate

'

[4],[5]

'

'

5.20%

[1],[6]

'

'

'

5.20%

'

'

'

'

'

'

3.50%

'

3.50%

'

'

'

'

'

'

'

Repayment of loans payable

44,825,000

12,185,000

'

'

'

'

'

'

'

'

'

'

'

52,300,000

'

10,000,000

'

'

'

'

'

'

'

'

Lease period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'29 years

'

Percentage of capital event cash flows distributed

'

'

'

'

'

'

'

'

75.00%

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Threshold of member unreturned capital for distribution of net operating cash flows

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

Holding and distribution pattern under operating agreement

'

'

'

'In general, the operating agreement of URL-Harborside provides that net operating cash flows are distributed first, to the members in respect of preferred return, as defined, until each member shall have received payment of the accrued and unpaid preferred return; and, thereafter, 75 percent to the Company and 25 percent to ISA.

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

See discussion in Recent Transactions following in this footnote.

[2]

Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. See discussion in Recent Transactions following in this footnote.

[3]

Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

[4]

Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $63,581 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 AugustB 27, 2015.

[5]

See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.

[6]

The construction/permanent loan has a maximum borrowing amount of $192,000.

Investments_In_Unconsolidated_4

Investments In Unconsolidated Joint Ventures (Summary Of Unconsolidated Joint Ventures) (Details) (USD $)

9 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

0 Months Ended

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Aug. 15, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

21-May-14

Aug. 01, 2014

Sep. 30, 2014

Aug. 01, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 02, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Jun. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

Aug. 15, 2014

item

Minimum [Member]

Maximum [Member]

Multi-Family Properties [Member]

Marbella RoseGarden, L.L.C. [Member]

Marbella RoseGarden, L.L.C. [Member]

RoseGarden Monaco Holdings, L.L.C. [Member]

RoseGarden Monaco Holdings, L.L.C. [Member]

Rosewood Lafayette Holdings, L.L.C. [Member]

Rosewood Lafayette Holdings, L.L.C. [Member]

PruRose Port Imperial South 15, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Overlook Ridge JV, L.L.C. [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

PruRose Riverwalk G, L.L.C. [Member]

PruRose Riverwalk G, L.L.C. [Member]

Elmajo Urban Renewal Associates, LLC [Member]

Elmajo Urban Renewal Associates, LLC [Member]

Crystal House Apartments Investors LLC [Member]

Crystal House Apartments Investors LLC [Member]

Portside Master Company, L.L.C. [Member]

Portside Master Company, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

Roseland/Port Imperial Partners, L.P. [Member]

Roseland/Port Imperial Partners, L.P. [Member]

RoseGarden Marbella South, L.L.C. [Member]

RoseGarden Marbella South, L.L.C. [Member]

Estuary Urban Renewal Unit B, LLC [Member

Estuary Urban Renewal Unit B, LLC [Member

Riverpark At Harrison I, L.L.C. [Member]

Riverpark At Harrison I, L.L.C. [Member]

Capitol Place Mezz LLC [Member]

Capitol Place Mezz LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

RoseGarden Monaco, L.L.C. [Member]

RoseGarden Monaco, L.L.C. [Member]

Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]

Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]

Red Bank Corporate Plaza, L.L.C. [Member]

Red Bank Corporate Plaza, L.L.C. [Member]

12 Vreeland Associates, L.L.C. [Member]

12 Vreeland Associates, L.L.C. [Member]

BNES Associates III [Member]

BNES Associates III [Member]

Hillsborough 206 Holdings, L.L.C. [Member]

Hillsborough 206 Holdings, L.L.C. [Member]

KPG-P 100 IMW JV, LLC [Member]

KPG-P 100 IMW JV, LLC [Member]

Keystone-Penn [Member]

Keystone-Penn [Member]

Keystone-Penn [Member]

Keystone-Penn [Member]

Keystone-Penn [Member]

Keystone-Penn [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-TriState [Member]

Keystone-Penn And Keystone-TriState [Member]

Keystone-Penn And Keystone-TriState [Member]

KPG-MCG Curtis JV, LLC [Member]

KPG-MCG Curtis JV, LLC [Member]

Curtis Center TIC I And II LLC [Member]

Plaza VIII & IX Associates, L.L.C. [Member]

Plaza VIII & IX Associates, L.L.C. [Member]

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

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

South Pier At Harborside [Member]

South Pier At Harborside [Member]

South Pier At Harborside [Member]

Stamford SM LLC [Member]

Stamford SM LLC [Member]

Other [Member]

Other [Member]

The Shops At 40 Park Property [Member]

Lofts At 40 Park Property [Member]

Metropolitan Property [Member]

Port Imperial North Land [Member]

Senior Loans [Member]

Junior Loans [Member]

Letter of Credit [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Construction Loan Extension Number 1 [Member]

Construction Loan Extension Number 1 [Member]

Construction Loan Extension Number 1 [Member]

Construction Loan Extension Number 1 [Member]

Construction Loan Extension Number 1 [Member]

Construction Loan Extension Number 2 [Member]

Construction Loan Extension Number 2 [Member]

Construction Loan Extension Number 2 [Member]

Construction Loan Extension Number 2 [Member]

Construction Loan Extension Number 2 [Member]

Construction Loan Extension Number 2 [Member]

Mezz Loan [Member]

Mezz Loan [Member]

Overlook Ridge Properties [Member]

Overlook Ridge Properties [Member]

Overlook Ridge Properties [Member]

Overlook Ridge Properties [Member]

Overlook Ridge Properties [Member]

Overlook Ridge Properties [Member]

LR Overlook Phase III, L.L.C. [Member]

Overlook Ridge, L.L.C. [Member]

item

item

item

item

item

item

item

item

item

item

item

item

item

item

item

item

item

item

item

Construction Loan [Member]

Construction Loan [Member]

Construction Loan [Member]

Parent Company [Member]

Keystone Property Group [Member]

item

item

sqft

sqft

sqft

sqft

item

sqft

Principal Balance Due August 27, 2023 [Member]

Principal Balance Due August 27, 2016 [Member]

Principal Balance Due August 27, 2016 [Member]

Principal Balance Due August 27, 2016 [Member]

Principal Balance Due August 27, 2015 [Member]

property

Principal Balance Due July 1, 2017 [Member]

Principal Balance Due September 9th, 2017 [Member]

Principal Balance Due July 6, 2024 [Member]

Principal Balance Due July 6, 2044 [Member]

Principal Balance Due August 6, 2044 [Member]

Parent Company [Member]

Keystone Property Group [Member]

Parent Company [Member]

Keystone Property Group [Member]

sqft

Parent Company [Member]

sqft

sqft

room

Hotel [Member]

Rosewood Morristown, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Roseland/Port Imperial Partners, L.P. [Member]

Quarrystone I Property [Member]

Quarrystone I Property [Member]

Quarrystone I Property [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

PruRose Riverwalk G, L.L.C. [Member]

Elmajo Urban Renewal Associates, LLC [Member]

Portside Master Company, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

RoseGarden Marbella South, L.L.C. [Member]

Estuary Urban Renewal Unit B, LLC [Member

Riverpark At Harrison I, L.L.C. [Member]

Capitol Place Mezz LLC [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

Portside Master Company, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

RoseGarden Marbella South, L.L.C. [Member]

Riverpark At Harrison I, L.L.C. [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

Portside Master Company, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

RoseGarden Marbella South, L.L.C. [Member]

Riverpark At Harrison I, L.L.C. [Member]

Stamford SM LLC [Member]

Stamford SM LLC [Member]

Multi-Family Properties [Member]

Multi-Family Properties [Member]

Consolidated Land [Member]

Consolidated Land [Member]

Consolidated Land [Member]

sqft

Minimum [Member]

Maximum [Member]

sqft

sqft

item

item

Overlook Ridge JV, L.L.C. [Member]

Overlook Ridge JV, L.L.C. [Member]

Overlook Ridge JV, L.L.C. [Member]

item

item

item

item

Parent Company [Member]

property

Minimum [Member]

Maximum [Member]

Schedule of Equity Method Investments [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Apartment Units

'

'

'

'

4,940

412

[1]

'

523

[1]

'

217

[1]

'

236

[1]

130

[2],[3]

'

251

[1],[4]

'

371

[1],[4]

316

[1]

'

355

[1]

'

828

[5]

'

176

[1]

'

280

[1]

'

363

[1],[6]

'

311

'

227

[1]

'

141

'

377

'

763

[7]

'

'

'

'

'

'

300

'

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

350

'

'

'

'

'

'

'

59

'

836

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Square Feet

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

92,878

'

139,750

'

106,345

'

160,000

'

339,615

'

1,842,820

'

'

'

'

'

1,266,384

'

'

'

'

'

'

'

'

'

885,000

[8]

'

'

1,225,000

'

30,745

[1]

'

'

'

'

'

'

'

'

50,973

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Company's Effective Ownership %

'

[9]

'

7.50%

85.00%

'

24.27%

[1],[9]

'

15.00%

[1],[9]

'

25.00%

[1],[9]

'

50.00%

[1],[9]

12.50%

[2],[3],[9]

'

50.00%

[1],[4],[9]

'

50.00%

[1],[4],[9]

25.00%

[1],[9]

'

7.50%

[1],[9]

'

25.00%

[5],[9]

'

38.25%

[1],[9]

'

20.00%

[1],[9]

'

20.00%

[1],[6],[9]

'

24.27%

[9]

'

7.50%

[1],[9]

'

36.00%

[9]

'

50.00%

[9]

'

85.00%

[7],[9]

'

'

'

'

'

50.00%

41.67%

[9]

'

50.00%

[9]

'

50.00%

[9]

'

50.00%

[9]

'

31.25%

[9]

'

50.00%

[9]

'

33.33%

[9]

'

'

[10],[9]

'

'

'

'

'

'

[11]

'

'

'

'

'

'

'

'

'

50.00%

[8],[9]

50.00%

'

50.00%

[9]

'

20.00%

[1],[9]

'

50.00%

[9]

'

'

80.00%

[12],[9]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Company's Carrying Amount

$239,767,000

$181,129,000

'

'

'

$15,784,000

[1]

$15,797,000

$2,438,000

[1]

$3,201,000

$275,000

[1]

$857,000

'

$6,127,000

[2],[3]

$6,455,000

'

'

$2,753,000

[1],[4]

$1,332,000

[1]

$3,117,000

'

$203,000

$26,602,000

[5]

$26,838,000

$2,306,000

[1]

$3,207,000

$1,402,000

[1]

$2,206,000

$1,849,000

[1],[6]

$2,068,000

$9,612,000

$7,567,000

'

$24,000

$4,556,000

$3,655,000

$48,682,000

$46,628,000

$28,080,000

[7]

$30,600,000

'

'

'

'

'

$1,269,000

$1,224,000

$337,000

$337,000

$3,880,000

$4,046,000

$5,680,000

$5,514,000

$2,026,000

$1,753,000

$1,962,000

$1,962,000

$339,000

$1,887,000

'

'

'

'

'

'

$5,725,000

'

'

'

'

'

'

'

'

'

$60,440,000

[8]

'

$60,440,000

$3,922,000

$3,702,000

$1,849,000

[1]

$1,930,000

'

[13]

'

[13]

'

'

$36,258,000

$540,000

[14]

$693,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Debt, Balance

1,607,411,000

'

'

'

'

95,000,000

[1]

'

165,000,000

[1]

'

38,846,000

[1]

'

57,500,000

[1]

46,217,000

[15],[2],[3]

'

69,580,000

[1],[16],[4]

'

47,872,000

[1],[4]

79,053,000

[1]

'

79,266,000

[1]

'

165,000,000

[5]

'

32,693,000

[1]

'

37,355,000

[1]

'

'

'

19,626,000

'

30,830,000

[1]

'

17,446,000

'

55,414,000

'

'

'

'

'

'

'

'

'

'

'

'

16,054,000

'

14,124,000

'

6,907,000

'

'

'

61,500,000

'

201,606,000

127,600,000

63,581,000

'

'

10,425,000

204,548,000

41,240,000

70,608,000

14,250,000

63,400,000

15,050,000

'

'

'

'

'

[17]

'

'

'

'

'

'

65,974,000

'

61,850,000

'

'

'

'

6,500,000

1,117,000

38,600,000

'

52,580,000

17,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Debt, Maturity Date

'

'

'

'

'

'05/01/18

[1]

'

'02/01/21

[1]

'

'07/01/15

[1]

'

'09/01/20

[1]

'

'

'

'

'12/26/15

[1],[4]

'07/15/21

[1]

'

'06/27/16

[1]

'

'04/01/20

[5]

'

'12/04/15

[1]

'

'06/27/16

[1]

'

'

'

'03/30/17

'

'01/25/17

[1]

'

'06/27/16

'

'07/01/2033

'

'08/01/29

[7]

'

'

'

'

'

'

'-

'

'

'

'05/17/16

'

'07/01/23

'

'11/01/23

'

'

'

'09/09/16

'

'

'August 27, 2023

'August 27, 2016

'

'

'August 27, 2015

'

'July 1, 2017

'September 9, 2017

'July 6, 2024

'July 6, 2044

'August 6, 2044

'

'

'

'

'

'

'

'

'

'

'

'August 1, 2020

'

'November 2016

'

'

'

'

'August 2018

'September 2015

'September 2020

'

'March 2016

'March 2016

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Debt, Interest Rate

'

[17],[18]

'

'

'

'

4.99%

[1]

'

4.19%

[1]

'

4.00%

[1]

'

4.32%

[1]

'

'

'

'

'

6.00%

[1],[19]

'

'

'

3.17%

[5]

'

'

'

'

'

'

'

'

'

'

'

'

'

4.82%

[20]

'

5.20%

[21],[7]

'

'

'

5.20%

'

'

'

'

'

'

3.99%

'

2.87%

'

4.76%

'

'

'

'

'

'

5.11%

'

'

'

'

'

[22]

'

'

4.88%

4.93%

4.71%

'

'

'

'

'

'

'

'

'

'

'

'

[23]

'

6.15%

'

'

'

'

3.63%

'

3.25%

'

'

'

'

'

3.09%

'

'

'

'

2.79%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Debt, Interest Rate, LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'L+2.50

[1],[24],[4]

'

'

'L+2.10

[1],[25]

'

'

'

'L+2.50

[1],[26]

'

'L+2.15

[1],[27]

'

'

'

'L+2.25

[28]

'

'L+2.10

[1],[29]

'

'L+2.35

[30]

'

'

'

'

'

'

'

'

'

'

'-

'

'

'

'L+3.00

[31]

'

'

'

'

'

'

'

'L+7.00

[32]

'

'

'

'

'LIBOR+5.0

'LIBOR+5.75

'LIBOR+6.0

'

'4.95

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Debt, Interest Rate, Spread Over LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

[1],[24],[4]

'

'

2.10%

[1],[25]

'

'

'

2.50%

[1],[26]

'

2.15%

[1],[27]

'

'

'

2.25%

[28]

'

2.10%

[1],[29]

'

2.35%

[30]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.00%

[31]

'

'

'

'

'

'

'

7.00%

[32]

'

'

'

'

5.00%

5.75%

6.00%

'

4.95%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

'

'

2.00%

0.90%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.50%

3.50%

'

'

Residual ownership interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12.50%

'

'

20.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Indirect ownership interest

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

Number of properties in which additional interest was acquired during period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

Number of stories

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Note payable

'

'

'

'

'

'

'

'

'

'

'

'

975,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,970,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,600,000

'

'

'

'

'

600,000

12,990,000

Number of extension options

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

2

'

'

2

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan extension period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'1 year

'2 years

'

'

'1 year

'1 year

'1 year

'

'

'

'1 year

'

'

'2 years

'

'2 years

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

Extension fee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

'

'

'

0.25%

'

'

0.25%

0.13%

0.25%

0.25%

0.20%

'

0.25%

0.25%

0.25%

0.25%

0.20%

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

192,000,000

192,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

17,000,000

'

55,500,000

83,113,000

91,000,000

42,500,000

'

73,350,000

77,400,000

57,000,000

23,400,000

100,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding borrowings under the facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

16,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,650,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,840,000

52,000,000

'

'

'

1,620,000

69,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of interest in developable land

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

Number of units available for development

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

295

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of approved units available for development

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

252

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Construction reserve

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

25,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Internal rate of return

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

18.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

10.00%

15.00%

15.00%

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bears interest at fixed rate range, minimum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.65%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.09%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Bears interest at fixed rate range, maximum

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6.62%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

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Maturity date of the Senior Unsecured Notes

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1-Aug-29

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Letter of credit

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4,100,000

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Sales proceeds

319,239,000

390,600,000

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47,200,000

37,800,000

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Sale price of property, capital balance in properties in which senior pari passu interest is held

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$6,500,000

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Number of properties with senior pari passu interest

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5

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[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]

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").

[3]

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, 2014), and is not expected to meaningfully participate in the venture's cash flows in the near term.

[4]

On August 15, 2014, the Company acquired the equity interests of its joint venture partner in Overlook Ridge JV 2C/3B, L.L.C. for $2.97 million and LR Overlook Phase II, L.L.C., the property-owning entity owned by Overlook Ridge JV, L.L.C., which increased its ownership to 50 percent in two operating multi-family properties. The Company also acquired the equity interests of its joint venture partner in LR Overlook Phase III, L.L.C. and Overlook Ridge, L.L.C. for $0.6 million and $12.99 million respectively, which increased its ownership to 100 percent in developable land (See Note 3: Real Estate Transactions - Acquisitions).

[5]

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.

[6]

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.

[7]

See discussion in Recent Transactions following in this footnote.

[8]

Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. See discussion in Recent Transactions following in this footnote.

[9]

Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

[10]

The Companybs equity interests in the joint ventures will be subordinated to Keystone Entities receiving a 15 percent internal rate of return (bIRRb) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally.

[11]

Includes the Companybs pari-passu interests of $6.5 million in five properties and Companybs subordinated equity interests to Keystone Entities receiving a 15 percent internal rate of return (bIRRb) after which the Company will receive a 10 percent IRR on its subordinate equity and then all profit will be split equally (See Note 3: Real Estate Transactions - Sales).

[12]

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.

[13]

The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.

[14]

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.

[15]

Property debt balance consists of: (i) a loan, collateralized by the Metropolitan at 40 Park, with a balance of $38,600 at September 30, 2014, bears interest at 3.25 percent, matures in September 2020 and is interest only through September 2015; (ii) a loan, collateralized by the Shops at 40 Park, with a balance of $6,500 at September 30, 2014, bears interest at 3.63 percent, matures in August 2018 and is interest-only through July 2015; and (iii) a loan, collateralized by the Lofts at 40 Park, with a balance of $1,117, bears interest at LIBOR plus 250 basis points and matures in September 2015. The Shops at 40 Park mortgage loan also provides for additional borrowing proceeds of $1 million based on certain preferred thresholds being achieved.

[16]

Property debt balance consists of: (i) the senior loan, collateralized by the Quarrystone property, with a balance of $52,580 at September 30, 2014, bears interest at LIBOR plus 200 basis, matures in March 2016 and (ii) the junior loan, with a balance of $17,000, bears interest at LIBOR plus 90 basis points, matures in March 2016 and is collateralized by a $17,000 letter of credit provided by an affiliate of the partner.

[17]

See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.

[18]

Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $63,581 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 AugustB 27, 2015.

[19]

The construction loan has a maximum borrowing amount of $83,113.

[20]

The construction/permanent loan has a maximum borrowing amount of $100,700 with amortization starting in August 2017.

[21]

The construction/permanent loan has a maximum borrowing amount of $192,000.

[22]

Principal balance of $41,240 bears interest at 4.95 percent and matures on July 1, 2017; principal balance of $70,608 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.

[23]

Balance includes: (i) mortgage loan, collateralized by the hotel property, with a balance of $61,850, bears interest at 6.15 percent and matures in November 2016, and (ii) loan with a balance of $4.1 million, bears interest at fixed rates ranging from 6.09 percent to 6.62 percent and matures in August 1, 2020. The Company posted a $4.1 million letter of credit in support of this loan, half of which is indemnified by the partner.

[24]

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.

[25]

The construction loan has a maximum borrowing amount of $91,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.

[26]

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.

[27]

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.

[28]

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.

[29]

The construction loan has a maximum borrowing amount of $57,000 and provides, subject to certain conditions, a one-year extension option with a fee of 25 basis points.

[30]

The construction loan has a maximum borrowing amount of $23,400 and provides, subject to certain conditions, two one-year extension options with a fee of 20 basis points for each year.

[31]

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.

[32]

The mortgage loan has two one-year extension options, subject to certain conditions, and includes a $25 million construction reserve with a balance of $16.8 million at September 30, 2014.

Investments_In_Unconsolidated_5

Investments In Unconsolidated Joint Ventures (Summary Of Financial Position Of Unconsolidated Joint Ventures) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments In Unconsolidated Joint Ventures [Abstract]	'	'
Rental property, net	$1,404,929	$755,049
Loan receivable	'	45,050
Other assets	445,127	582,990
Total assets	1,850,056	1,383,089
Mortgages and loans payable	992,434	637,709
Other liabilities	221,414	87,231
Partners'/members' capital	636,208	658,149
Total liabilities and partners'/members' capital	$1,850,056	$1,383,089

Investments_In_Unconsolidated_6

Investments In Unconsolidated Joint Ventures (Summary Of Company's Investment In Unconsolidated Joint Ventures) (Details) (USD $)

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

21-May-14

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

In Thousands, unless otherwise specified

Marbella RoseGarden, L.L.C. [Member]

Marbella RoseGarden, L.L.C. [Member]

RoseGarden Monaco Holdings, L.L.C. [Member]

RoseGarden Monaco Holdings, L.L.C. [Member]

Rosewood Lafayette Holdings, L.L.C. [Member]

Rosewood Lafayette Holdings, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Rosewood Morristown, L.L.C. [Member]

Overlook Ridge JV 2C/3B, L.L.C. [Member]

PruRose Riverwalk G, L.L.C. [Member]

PruRose Riverwalk G, L.L.C. [Member]

Elmajo Urban Renewal Associates, LLC [Member]

Crystal House Apartments Investors LLC [Member]

Crystal House Apartments Investors LLC [Member]

Portside Master Company, L.L.C. [Member]

Portside Master Company, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

PruRose Port Imperial South 13, L.L.C. [Member]

Roseland/Port Imperial Partners, L.P. [Member]

Roseland/Port Imperial Partners, L.P. [Member]

RoseGarden Marbella South, L.L.C. [Member]

RoseGarden Marbella South, L.L.C. [Member]

Estuary Urban Renewal Unit B, LLC [Member

Riverpark At Harrison I, L.L.C. [Member]

Riverpark At Harrison I, L.L.C. [Member]

Capitol Place Mezz LLC [Member]

Capitol Place Mezz LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

Harborside Unit A Urban Renewal, LLC [Member]

RoseGarden Monaco, L.L.C. [Member]

RoseGarden Monaco, L.L.C. [Member]

Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]

Grand Jersey Waterfront Urban Renewal Associates, L.L.C. [Member]

Red Bank Corporate Plaza, L.L.C. [Member]

Red Bank Corporate Plaza, L.L.C. [Member]

12 Vreeland Associates, L.L.C. [Member]

12 Vreeland Associates, L.L.C. [Member]

BNES Associates III [Member]

BNES Associates III [Member]

Hillsborough 206 Holdings, L.L.C. [Member]

Hillsborough 206 Holdings, L.L.C. [Member]

KPG-P 100 IMW JV, LLC [Member]

KPG-P 100 IMW JV, LLC [Member]

Keystone-TriState [Member]

KPG-MCG Curtis JV, LLC [Member]

Curtis Center TIC I And II LLC [Member]

Plaza VIII & IX Associates, L.L.C. [Member]

Plaza VIII & IX Associates, L.L.C. [Member]

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

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

South Pier At Harborside [Member]

South Pier At Harborside [Member]

Stamford SM LLC [Member]

Other [Member]

Other [Member]

Schedule of Equity Method Investments [Line Items]

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Company's investment in unconsolidated joint ventures

$239,767

$181,129

$15,784

[1]

$15,797

$2,438

[1]

$3,201

$275

[1]

$857

$6,127

[2],[3]

$6,455

$2,753

[1],[4]

$1,332

[1]

$3,117

$203

$26,602

[5]

$26,838

$2,306

[1]

$3,207

$1,402

[1]

$2,206

$1,849

[1],[6]

$2,068

$9,612

$7,567

$24

$4,556

$3,655

$48,682

$46,628

$28,080

[7]

$30,600

$1,269

$1,224

$337

$337

$3,880

$4,046

$5,680

$5,514

$2,026

$1,753

$1,962

$1,962

$339

$1,887

$5,725

$60,440

[8]

$60,440

$3,922

$3,702

$1,849

[1]

$1,930

'

[9]

'

[9]

$36,258

$540

[10]

$693

Accounts payable, accrued expenses and other liabilities

$126,580

$121,286

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$2,582

$1,706

'

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[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]

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").

[3]

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, 2014), and is not expected to meaningfully participate in the venture's cash flows in the near term.

[4]

On August 15, 2014, the Company acquired the equity interests of its joint venture partner in Overlook Ridge JV 2C/3B, L.L.C. for $2.97 million and LR Overlook Phase II, L.L.C., the property-owning entity owned by Overlook Ridge JV, L.L.C., which increased its ownership to 50 percent in two operating multi-family properties. The Company also acquired the equity interests of its joint venture partner in LR Overlook Phase III, L.L.C. and Overlook Ridge, L.L.C. for $0.6 million and $12.99 million respectively, which increased its ownership to 100 percent in developable land (See Note 3: Real Estate Transactions - Acquisitions).

[5]

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.

[6]

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.

[7]

See discussion in Recent Transactions following in this footnote.

[8]

Includes undivided interests in the same manner as investments in noncontrolling partnership, pursuant to ASC 970-323-25-12. See discussion in Recent Transactions following in this footnote.

[9]

The negative investment balance for this joint venture of $2,582 and $1,706 as of September 30, 2014 and December 31, 2013, respectively, were included in accounts payable, accrued expenses and other liabilities.

[10]

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_Unconsolidated_7

Investments In Unconsolidated Joint Ventures (Summary Of Results Of Operations Of Unconsolidated Joint Ventures) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments In Unconsolidated Joint Ventures [Abstract]	'	'	'	'
Total revenues	$80,711	$99,117	$224,822	$202,810
Operating and other expenses	-58,684	-48,621	-173,642	-137,889
Depreciation and amortization	-15,134	-11,556	-31,715	-24,730
Interest expense	-11,296	-3,934	-26,423	-9,256
Net income (loss)	($4,403)	$35,006	($6,958)	$30,935

Investments_In_Unconsolidated_8

Investments In Unconsolidated Joint Ventures (Summary Of Company's Equity In Earnings (Loss) Of Unconsolidated Joint Ventures) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	($1,268)	($229)	($2,060)	($2,059)
Marbella RoseGarden, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	3	-170	-13	-446
RoseGarden Monaco Holdings, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-249	-416	-764	-1,238
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	-295	-639	-869
PruRose Port Imperial South 15, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	'	'	'	-606
Rosewood Morristown, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-90	-152	-264	-393
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	-217	53	-155	204
PruRose Riverwalk G, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-615	-198	-1,766	-576
Elmajo Urban Renewal Associates, LLC [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	'	-87	-203	-255
Crystal House Apartments Investors LLC [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	68	-1,149	-206	-2,671
Portside Master Company, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-228	-109	-661	-222
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	-220	-181	-638	-459
Roseland/Port Imperial Partners, L.P. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-173	'	-518	'
RoseGarden Marbella South, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	'	-20	'	-57
Estuary Urban Renewal Unit B, LLC [Member	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	'	-44	-15	-107
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	'	'	-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	101	99	306	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	22	-25	165	-1
BNES Associates III [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	127	-37	273	-108
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	'
KPG-P 100 IMW JV, LLC [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-412	'	-1,548	'
Keystone-TriState [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-733	'	-733	'
KPG-MCG Curtis JV, LLC [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	113	'	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	74	24	220	52
Roseland/North Retail, L.L.C. [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	-34	-62	-81	-194
South Pier At Harborside [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	583	835	1,874	1,380
Stamford SM LLC [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	493	1,023	2,337	2,805
Other [Member]	'	'	'	'
Schedule of Equity Method Investments [Line Items]	'	'	'	'
Company's equity in earnings (loss) of unconsolidated joint ventures	$340	$682	$876	$1,396

Deferred_Charges_Goodwill_And_2

Deferred Charges, Goodwill And Other Assets (Details) (USD $)	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified					Mortgage Receivable [Member]	8% Notes Receivable [Member]	3.5% Notes Receivable [Member]	Interest-Free Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]	'		'		'	'	'	'
Deferred leasing costs	$226,605		$258,648		'	'	'	'
Deferred financing costs	24,689		25,366		'	'	'	'
Deferred charges, gross	251,294		284,014		'	'	'	'
Accumulated amortization	-115,620		-131,669		'	'	'	'
Deferred charges, net	135,674		152,345		'	'	'	'
Notes receivable	73,828	[1]	21,986	[1]	10,400	7,800	52,300	3,400
In-place lease values, related intangible and other assets, net	7,566		13,659		'	'	'	'
Goodwill	2,945		2,945		'	'	'	'
Prepaid expenses and other assets, net	100,383	[2]	27,584	[2]	61,900	'	'	'
Total deferred charges, goodwill and other assets	$320,396		$218,519		'	'	'	'
Spread over LIBOR	'		'		6.00%	'	'	'
Interest rate	'		'		'	8.00%	3.50%	'
[1]	Includes as of September 30, 2014: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent; a note receivable for $7.8 million which bears interest at eight percent; an interest-free note receivable with a net present value of $3.4 million and a note receivable for $52.3 million which bore interest at 3.5 percent (which was repaid in full on October 1, 2014).
[2]	Includes a receivable of $61.9 million related to the completion of the Curtis Center mortgage loan financing on September 30, 2014 for which the Company received its loan proceeds on October 1, 2014. See Note 10: Mortgages, Loans Payable and Other Obligations.

Restricted_Cash_Details

Restricted Cash (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Restricted Cash [Abstract]	'	'
Security deposits	$7,594	$8,534
Escrow and other reserve funds	18,977	11,260
Total restricted cash	$26,571	$19,794

Discontinued_Operations_Narrat

Discontinued Operations (Narrative) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
	sqft	item
	item	sqft
	property	property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]	'	'
Number of properties sold	16	24
Area of property sold (in square feet)	2,610,931	3,000,000
Number of land parcels sold	'	3
Sales proceeds	$319,239	$390,600

Discontinued_Operations_Summar

Discontinued Operations (Summary Of Income From Discontinued Operations And Related Realized And Unrealized Gains (Losses)) (Details) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2013
Discontinued Operations [Abstract]	'	'
Total revenues	$6,405	$33,610
Operating and other expenses	-2,472	-13,454
Depreciation and amortization	-1,769	-8,196
Interest expense	'	-118
Income from discontinued operations	2,164	11,842
Loss from early extinguishment of debt	'	-703
Impairments	'	-23,851	[1]
Realized gains on disposition of rental property	47,321	84,930
Realized gains (losses) and unrealized losses on disposition of rental property and impairments, net	47,321	61,079
Total discontinued operations	$49,485	$72,218
[1]	Represents impairment charges recorded on certain properties prior to their sale.

Senior_Unsecured_Notes_Summary

Senior Unsecured Notes (Summary Of Senior Unsecured Notes) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	$1,417,439		$1,616,575
Interest rate of senior unsecured notes	'	[1],[2]	'
5.125% Senior Unsecured Notes, Due February 15, 2014 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	'		200,030	[3]
Effective Rate	5.11%	[3],[4]	'
Interest rate of senior unsecured notes	5.13%	[3]	'
Maturity date of the Senior Unsecured Notes	15-Feb-14	[3]	'
5.125% Senior Unsecured Notes, Due January 15, 2015 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	149,971		149,902
Effective Rate	5.30%	[4]	'
Interest rate of senior unsecured notes	5.13%		'
Maturity date of the Senior Unsecured Notes	15-Jan-15		'
5.800% Senior Unsecured Notes, Due January 15, 2016 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	200,104		200,161
Effective Rate	5.81%	[4]	'
Interest rate of senior unsecured notes	5.80%		'
Maturity date of the Senior Unsecured Notes	15-Jan-16		'
2.500% Senior Unsecured Notes, Due December 15, 2017 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	249,077		248,855
Effective Rate	2.80%	[4]	'
Interest rate of senior unsecured notes	2.50%		'
Maturity date of the Senior Unsecured Notes	15-Dec-17		'
7.750% Senior Unsecured Notes, Due August 15, 2019 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	248,959		248,799
Effective Rate	8.02%	[4]	'
Interest rate of senior unsecured notes	7.75%		'
Maturity date of the Senior Unsecured Notes	15-Aug-19		'
4.500% Senior Unsecured Notes Due April 18, 2022 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	299,550		299,505
Effective Rate	4.61%	[4]	'
Interest rate of senior unsecured notes	4.50%		'
Maturity date of the Senior Unsecured Notes	18-Apr-22		'
3.150% Senior Unsecured Note, Due May 15, 2023 [Member]	'		'
Debt Instrument [Line Items]	'		'
Senior Unsecured Notes	$269,778		$269,323
Effective Rate	3.52%	[4]	'
Interest rate of senior unsecured notes	3.15%		'
Maturity date of the Senior Unsecured Notes	15-May-23		'
[1]	Principal balance of $127,600 bears interest at 5.114 percent and matures in August 27, 2023; principal balance of $63,581 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 AugustB 27, 2015.
[2]	See Note 10: Mortgages, Loans Payable and Other Obligations for debt secured by interests in these assets.
[3]	On February 17, 2014, the Company repaid these notes at their maturity using available cash and borrowings on the Companybs unsecured revolving credit facility.
[4]	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_Fac2

Unsecured Revolving Credit Facility (Narrative) (Details) (USD $)	9 Months Ended				0 Months Ended					9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Jul. 15, 2013	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
	item	Unsecured Revolving Credit Facility [Member]	Unsecured Revolving Credit Facility 1 [Member]	Unsecured Revolving Credit Facility 2 [Member]	Previous Unsecured Revolving Credit Facility [Member]	Money Market Loan [Member]	Money Market Loan [Member]	Minimum [Member]	Maximum [Member]	Maximum [Member]
		item						Unsecured Revolving Credit Facility [Member]	Unsecured Revolving Credit Facility [Member]	Money Market Loan [Member]
								item
Line Of Credit Facility [Line Items]	'	'	'	'	'	'	'	'	'	'
Number of lending institutions	'	17	'	'	'	'	'	'	'	'
Borrowing capacity under the credit facility	'	$600,000,000	'	'	$600,000,000	$75,000,000	'	'	'	'
Expandable borrowing capacity under the credit facility	'	1,000,000,000	'	'	'	'	'	'	'	'
Credit facility maturity date	'	1-Jul-17	'	'	'	'	'	'	'	'
Number of extension options	3	2	'	'	'	'	'	'	'	'
Credit facility, extension period	'	'6 months	'	'	'	'	'	'	'	'
Credit facility extension fee, basis points	'	'	0.08%	0.08%	0.25%	'	'	'	'	'
Line of credit facility, bid feature, current borrowing capacity	'	300,000,000	'	'	'	'	'	'	'	'
Leverage ratio	'	'	'	'	'	'	'	'	60.00%	'
Secured indebtedness	'	'	'	'	'	'	'	'	40.00%	'
Fixed charge coverage ratio	'	'	'	'	'	'	'	1.5	'	'
Unsecured indebtedness	'	'	'	'	'	'	'	'	60.00%	'
Unencumbered property interest coverage	'	'	'	'	'	'	'	2	'	'
Investment limitations as a percentage of total capitalization	'	'	'	'	'	'	'	'	15.00%	'
Terms of the unsecured facility	'	'The terms of the unsecured facility include certain restrictions and covenants which limit, among other things the incurrence of additional indebtedness, the incurrence of liens and the disposition of real estate properties (to the extent that: (i) such property dispositions cause the Company to default on any of the financial ratios of the facility described below, or (ii) the property dispositions are completed while the Company is under an event of default under the facility, unless, under certain circumstances, such disposition is being carried out to cure such default), and which require compliance with financial ratios relating to the maximum leverage ratio (60 percent), the maximum amount of secured indebtedness (40 percent), the minimum amount of fixed charge coverage (1.5 times), the maximum amount of unsecured indebtedness (60 percent), the minimum amount of unencumbered property interest coverage (2.0 times) and certain investment limitations (generally 15 percent of total capitalization).	'	'	'	'	'	'	'	'
Terms of dividend restriction	'	'If an event of default has occurred and is continuing, the Corporation will not make any excess distributions except to enable the Corporation to continue to qualify as a REIT under the Code.	'	'	'	'	'	'	'	'
Outstanding borrowings under the facility	'	'	'	'	'	$0	$0	'	'	'
Spread over LIBOR	'	'	'	'	1.25%	'	'	'	'	'
Maturity period of the unsecured borrowing	'	'	'	'	'	'	'	'	'	'30 days

Unsecured_Revolving_Credit_Fac3

Unsecured Revolving Credit Facility (Change In The Operating Partnership's Unsecured Debt Ratings) (Details) (Unsecured Revolving Credit Facility [Member])	9 Months Ended
	Sep. 30, 2014
No Ratings Or Less Than Baa3 [Member] | No Ratings Or Less Than BBB- [Member]	'
Line Of Credit Facility [Line Items]	'
Unsecured Debt Ratings	'No ratings or less than BBB-/Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.70%
Facility Fee Basis Points	0.35%
Moody's, Baa3 Rating [Member] | Standard & Poor's, BBB- Rating [Member]	'
Line Of Credit Facility [Line Items]	'
Unsecured Debt Ratings	'BBB- or Baa3
Interest Rate - Applicable Basis Points Above LIBOR	1.30%
Facility Fee Basis Points	0.30%
Moody's, Baa2 Rating [Member] | Standard & Poor's, BBB Rating [Member]	'
Line Of Credit Facility [Line Items]	'
Unsecured Debt Ratings	'BBB or Baa2(current)
Interest Rate - Applicable Basis Points Above LIBOR	1.10%
Facility Fee Basis Points	0.20%
Moody's, Baa1 Rating [Member] | Standard & Poor's, BBB+ Rating [Member]	'
Line Of Credit Facility [Line Items]	'
Unsecured Debt Ratings	'BBB+ or Baa1
Interest Rate - Applicable Basis Points Above LIBOR	1.00%
Facility Fee Basis Points	0.15%
A3 Or Higher [Member] | A- Or Higher [Member]	'
Line Of Credit Facility [Line Items]	'
Unsecured Debt Ratings	'A- or A3 or higher
Interest Rate - Applicable Basis Points Above LIBOR	0.93%
Facility Fee Basis Points	0.13%

Mortgages_Loans_Payable_And_Ot2

Mortgages, Loans Payable And Other Obligations (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
	property
Debt Instrument [Line Items]	'	'	'
Number of properties with encumbered company mortgages	30	'	'
Book value of encumbered properties	$982,000,000	'	'
Cash paid for interest	92,096,000	97,284,000	'
Interest capitalized	10,650,000	10,262,000	'
Total indebtedness	2,238,641,000	'	2,362,766,000
Total indebtedness, weighted average interest rate	5.62%	'	5.62%
Unconsolidated Joint Venture [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest capitalized	3,284,000	980,000	'
Revolving Credit Facility Borrowings And Other Variable Rate Mortgage Debt [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total indebtedness	195,426,000	'	80,228,000
Total indebtedness, weighted average interest rate	3.86%	'	2.74%
Fixed Rate Debt And Other Obligations [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Total indebtedness	$2,043,215,000	'	$2,282,538,000
Total indebtedness, weighted average interest rate	5.78%	'	5.72%

Mortgages_Loans_Payable_And_Ot3

Mortgages, Loans Payable And Other Obligations (Summary Of Mortgages, Loans Payable And Other Obligations) (Details) (USD $)

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Dec. 31, 2013

Sep. 30, 2014

Aug. 15, 2014

item

6301 Ivy Lane [Member]

6301 Ivy Lane [Member]

395 West Passaic [Member]

395 West Passaic [Member]

35 Waterview Boulevard [Member]

35 Waterview Boulevard [Member]

233 Canoe Brook Road [Member]

233 Canoe Brook Road [Member]

6 Becker, 85 Livingston, 75 Livingston And 20 Waterview [Member]

6 Becker, 85 Livingston, 75 Livingston And 20 Waterview [Member]

4 Sylvan [Member]

4 Sylvan [Member]

10 Independence [Member]

10 Independence [Member]

Port Imperial South 4/5 [Member]

Port Imperial South 4/5 [Member]

Overlook - Site IIID, IIIC, IIIA [Member]

Overlook - Site IIIB [Member]

9200 Edmonston Road [Member]

9200 Edmonston Road [Member]

Port Imperial South [Member]

Port Imperial South [Member]

4 Becker [Member]

4 Becker [Member]

5 Becker [Member]

5 Becker [Member]

210 Clay [Member]

210 Clay [Member]

Curtis Center [Member]

Curtis Center [Member]

Curtis Center [Member]

Various [Member]

Various [Member]

150 Main St. [Member]

23 Main Street [Member]

23 Main Street [Member]

Harborside Plaza 5 [Member]

Harborside Plaza 5 [Member]

100 Walnut Avenue [Member]

100 Walnut Avenue [Member]

One River Center [Member]

One River Center [Member]

Park Square [Member]

Consolidated Land [Member]

property

Senior Loan [Member]

Mezzanine Loan [Member]

property

property

Overlook Ridge Properties [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property Name

'

'

'

'6301 Ivy Lane (b)

[1]

'

'395 West Passaic (c)

[2]

'

'35 Waterview Boulevard (d)

[3]

'

'233 Canoe Brook Road (e)

[4]

'

'6 Becker, 85 Livingston, 75 Livingston & 20 Waterview

[5]

'

'4 Sylvan

'

'10 Independence (g)

[6]

'

'Port Imperial South 4/5

'

'Overlook - Site IIID,IIIC, IIIA (p)

[7]

'Overlook - Site IIB (Quarrystone I) (p)

[7]

'9200 Edmonston Road (h)

[8]

'

'Port Imperial South

'

'4 Becker

'

'5 Becker (i)

[9]

'

'210 Clay

'

'Curtis Center (j)

[10]

'

'

'Various (k)

[11]

'

'150 Main St.

'23 Main Street

'

'Harborside Plaza 5

'

'100 Walnut Avenue

'

'One River Center (l)

[12]

'

'Park Square

'

Lender

'

'

'

'RGA Reinsurance Company

[1]

'

'State Farm Life Insurance Co.

[2]

'

'Wells Fargo CMBS

[3]

'

'The Provident Bank

[4]

'

'Wells Fargo CMBS

[5]

'

'Wells Fargo CMBS

'

'Wells Fargo CMBS

[6]

'

'Wells Fargo Bank N.A.

'

'Wells Fargo Bank N.A.

[7]

'Wells Fargo Bank N.A.

[7]

'Principal Commercial Funding L.L.C.

[8]

'

'Wells Fargo Bank N.A.

'

'Wells Fargo CMBS

'

'Wells Fargo CMBS

[9]

'

'Wells Fargo CMBS

'

'CCRE & PREFG

[10]

'

'

'Prudential Insurance

[11]

'

'Webster Bank

'JPMorgan CMBS

'

'The Northwestern Mutual Life Insurance Co. & New York Life Insurance Co.

'

'Guardian Life Insurance Co.

'

'Guardian Life Insurance Co.

[12]

'

'Wells Fargo Bank N.A.

'

LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'LIBOR+3.50

[13]

'

'LIBOR+3.50

[13],[7]

'LIBOR+2.50

[13],[7]

'

'

'LIBOR+1.75

[13]

'

'

'

'

'

'

'

'LIBOR+4.55

[10],[13],[14]

'

'

'

'

'LIBOR+2.35

[13]

'

'

'

'

'

'

'

'

'LIBOR+1.75

[13],[15]

'

Effective Rate

'

'

'

5.52%

[1],[13]

'

6.00%

[13],[2]

'

6.35%

[13],[3]

'

4.38%

[13],[4]

'

10.22%

[13],[5]

'

10.19%

[13]

'

12.44%

[13],[6]

'

'

'

'

'

5.53%

[13],[8]

'

'

'

9.55%

[13]

'

12.83%

[13],[9]

'

13.42%

[13]

'

'

3.45%

9.65%

6.33%

[11],[13]

'

'

5.59%

[13]

'

6.84%

[13]

'

7.31%

[13]

'

7.31%

[12],[13]

'

'

'

Spread over LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3.50%

[16]

'

3.50%

[7]

2.50%

[7]

'

'

1.75%

'

'

'

'

'

'

'

4.55%

[10]

3.29%

9.50%

'

'

2.35%

'

'

'

'

'

'

'

'

1.75%

[15]

'

Mortgages, loans payable and other obligations

$821,202,000

'

$746,191,000

'

[1]

$5,447,000

[1]

'

[2]

$9,719,000

[2]

'

[3]

$18,417,000

[3]

'

[4]

$3,877,000

[4]

$65,035,000

[5]

$64,233,000

[5]

$14,575,000

$14,538,000

$16,924,000

[6]

$16,638,000

[6]

$36,950,000

$36,950,000

$17,100,000

[7]

$5,748,000

[7]

$3,996,000

[8]

$4,115,000

[8]

$43,910,000

$43,278,000

$39,268,000

$38,820,000

$13,666,000

[9]

$13,092,000

[9]

$13,182,000

$12,767,000

$64,000,000

[10]

$102,000,000

$26,000,000

$146,048,000

[11]

$147,477,000

[11]

$218,000

$29,373,000

$29,843,000

$222,480,000

$225,139,000

$18,606,000

$18,792,000

$42,623,000

[12]

$43,049,000

[12]

$27,500,000

'

Loan maturity date

'

'

'

'

'

'

'

'

'

'

'

11-Aug-14

[17],[5]

'

11-Aug-14

[17]

'

11-Aug-14

[6]

'

31-Oct-14

[16]

'

2-Mar-15

[7]

14-Apr-15

[7]

1-May-15

[8]

'

19-Sep-15

'

11-May-16

'

11-May-16

[9]

'

11-May-16

'

9-Oct-16

[10]

'

'

15-Jan-17

[11]

'

30-Mar-17

1-Sep-18

'

1-Nov-18

'

1-Feb-19

'

1-Feb-19

[12]

'

10-Apr-19

'

Loss from early extinguishment of debt

'

703,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of properties used to collateralize mortgage

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7

'

'

'

'

'

'

'

'

3

'

'

'

Percentage of interest in venture

'

[18]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

50.00%

50.00%

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$48,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

LIBOR measurement period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 month

'1 month

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of extension options

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loan extension period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred financing costs amortization interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.52%

'

'

'

'

'

'

'

'

'

'

'

'

'

0.12%

'

Percentage of interest in developable land

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100.00%

[1]

On April 1, 2014, the Company repaid the mortgage loan at par, using available cash.

[2]

On May 1, 2014, the Company repaid the mortgage loan at par, using available cash.

[3]

On May 12, 2014, the Company repaid the mortgage loan at par, using borrowings on the Companybs unsecured revolving credit facility.

[4]

On April 30, 2014, the Company repaid the mortgage loan at par, using available cash.

[5]

Mortgage is cross collateralized by the four properties.

[6]

The Company is negotiating a deed-in-lieu of foreclosure in satisfaction of this mortgage loan.

[7]

On August 15, 2014, the Company assumed these loans as a result of its acquisition of interests which increased its ownership to 100 percent in certain previously unconsolidated joint ventures which owned developable land.

[8]

The mortgage loan originally matured on May 1, 2013. The maturity date was extended until May 1, 2015 with the same interest rate. Excess cash flow, as defined, is being held by the lender for re-leasing costs. The deed for the property was placed in escrow and is available to the lender in the event of default or non-payment at maturity.

[9]

The cash flow from this property is insufficient to cover operating costs and debt service. Consequently, the Company notified the lender and suspended debt service payments in August 2013. The Company has begun discussions with the lender regarding a deed-in-lieu of foreclosure and began remitting available cash flow to the lender effective August 2013.

[10]

The Company owns a 50 percent tenants-in-common interest in the Curtis Center Property. The Companybs $64.0 million loan consists of its 50 percent interest in a $102 million senior loan with a current rate of 3.45 percent at September 30, 2014 and its 50 percent interest in a $26 million mezzanine loan (with a maximum borrowing capacity of $48 million) with a current rate of 9.65 percent at September 30, 2014. 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. Both loans have LIBOR caps for the period. The loans provide for three one-year extension options. As the Curtis Center Property loans closed on September 30, 2014 with the loan proceeds received on October 1, 2014, the Company recorded the loan and a receivable on September 30, 2014. See Note 5: Deferred Charges, Goodwill and Other Assets.

[11]

Mortgage is cross collateralized by seven properties. The Operating Partnership has agreed, subject to certain conditions, to guarantee repayment of a portion of the loan.

[12]

Mortgage is collateralized by the three properties comprising One River Center.

[13]

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.

[14]

Amortization of deferred financing costs adds 1.523 percent to the variable interest rate stated above.

[15]

Amortization of deferred financing costs adds 0.122 percent to the variable interest rate stated above.

[16]

The Company is pursuing permanent financing at the maturity of the construction financing in October 2014.

[17]

The Company has begun discussions with the lender regarding the past due maturity of the loans.

[18]

Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

Mortgages_Loans_Payable_And_Ot4

Mortgages, Loans Payable And Other Obligations (Summary Of Notional Fair Value Of Derivative Financial Instruments) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Derivatives, Fair Value [Line Items]	'
Fair Value	$174
LIBOR Cap One [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional Value	51,000	[1]
Strike Rate	1.50%
Effective Date	1-Sep-14
Expiration Date	1-Oct-15
Fair Value	4
LIBOR Cap Two [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional Value	24,000	[1]
Strike Rate	1.50%
Effective Date	1-Sep-14
Expiration Date	1-Oct-15
Fair Value	2
LIBOR Cap Three [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional Value	51,000	[1]
Strike Rate	1.75%
Effective Date	1-Oct-15
Expiration Date	1-Oct-16
Fair Value	115
LIBOR Cap Four [Member]	'
Derivatives, Fair Value [Line Items]	'
Notional Value	24,000	[1]
Strike Rate	1.75%
Effective Date	1-Oct-15
Expiration Date	1-Oct-16
Fair Value	$53
[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.

MackCali_Realty_LPs_Partners_C2

Mack-Cali Realty, L.P's Partners' Capital (Repurchase Of General Partner Units And Dividend Reinvestment And Stock Purchase Plan) (Narrative) (Details) (USD $)	9 Months Ended	22 Months Ended	25 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'	'	'
Capacity of share repurchase program	$150,000,000	'	$150,000,000
Shares purchased and retired	0	'	394,625
Aggregate cost of stock repurchased	'	'	11,000,000
Capacity available for additional repurchase of outstanding common stock	139,000,000	'	139,000,000
Common units purchased from the Company	'	'	394,625
Cost of units purchased from the company	'	11,000,000	'
Share repurchase program initiation date	'September 2012	'	'
Dividend Reinvestment And Stock Purchase Plan [Member]	'	'	'
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'	'	'
Common stock reserved for future issuance	5,500,000	'	5,500,000
Monthly cash investment without restriction, maximum	$5,000	'	'

MackCali_Realty_LPs_Partners_C3

Mack-Cali Realty, L.P's Partners' Capital (Stock Option Plans) (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

31-May-13

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

2013 Incentive Stock Plan [Member]

2004 Incentive Stock Plan [Member]

2000 Employee Plan [Member]

2000 Employee Plan [Member]

2000 Employee Plan [Member]

2000 Director Plan [Member]

2000 Director Plan [Member]

2000 Director Plan [Member]

Employee And Director Plan [Member]

Employee And Director Plan [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reserved stocks for issuance

'

'

'

'

'

4,600,000

2,500,000

'

4,000,000

2,500,000

'

350,000

200,000

4,350,000

2,700,000

Shares issued

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

Exercisable time period

'

'

'

'

'

'

'

'5 years

'

'

'1 year

'

'

'

'

Stock option terms

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average remaining contractual life

'

'

'5 years 2 months 12 days

'

'8 months 12 days

'

'

'

'

'

'

'

'

'

'

Share price

$1.71

'

$1.71

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from stock options exercised

$0

$0

$0

$0

'

'

'

'

'

'

'

'

'

'

'

Total intrinsic value of options exercised

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

Stock options expense

$1,000

$0

$3,000

$0

'

'

'

'

'

'

'

'

'

'

'

MackCali_Realty_LPs_Partners_C4

Mack-Cali Realty, L.P's Partners' Capital (Restricted Stock Awards And TSR-Based Awards) (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 12, 2012

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 12, 2012

Mar. 31, 2014

Sep. 30, 2014

Dec. 31, 2013

item

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Ratified Restricted Stock Awards [Member]

Ratified Restricted Stock Awards [Member]

Ratified Restricted Stock Awards [Member]

Ratified Restricted Stock Awards [Member]

Total Stockholder Return Based Awards [Member]

Total Stockholder Return Based Awards [Member]

Total Stockholder Return Based Awards [Member]

Total Stockholder Return Based Awards [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock compensation vesting period

'

'

'

'

'

'

'

'7 years

'1 year

'

'

'7 years

'5 years

'

'

'4 years

'

Unvested performance shares

'

'

42,000

'

63,933

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock expense

$830,000

$641,000

$5,094,000

$1,947,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of executive officers who departed

'

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares vested

'

'

183,214

'

'

'

'

'

'

'

109,667

'

'

'

357

'

'

Shares granted and vested

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

528

'

Unvested restricted stock outstanding

178,816

'

178,816

'

153,560

[1]

304,816

351,592

'

'

'

'

'

'

'

'

'

'

Restricted stock awards unvested shares outstanding performance contingent

'

'

'

'

'

210,000

'

'

'

'

'

'

'

'

'

'

'

Awards issued

'

'

208,589

[2]

'

'

'

'

'

'

319,667

'

'

'

5,160

'

'

1,032

Value of common stock received upon vesting of awards

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,000

'

Shares issued

'

'

45,062

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation cost

$1,600,000

'

$1,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation cost, period of recognition

'

'

'1 year 3 months 18 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent yearsb performance goals are met.

[2]

Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014. Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.

MackCali_Realty_LPs_Partners_C5

Mack-Cali Realty, L.P's Partners' Capital (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'	'	'
Maximum percentage of retainer fee that directors may defer	100.00%	'	'
Deferred stock units earned	15,230	16,332	'
Director stock units outstanding	152,745	'	136,440

MackCali_Realty_LPs_Partners_C6

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit) (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'	'	'	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10,000	15,000	'	'	'
Unvested restricted stock outstanding	178,816	'	178,816	'	153,560	[1]
Common unit distributions per unit declared	$0.15	$0.30	$0.60	$1.05	'
Restricted Stock [Member]	'	'	'	'	'
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'	'	'	'	'
Unvested restricted stock outstanding	304,816	351,592	304,816	351,592	'
[1]	Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent yearsb performance goals are met.

MackCali_Realty_LPs_Partners_C7

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Stock Option Plans) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'
Shares Under Options - Outstanding, beginning balance	15,000
Shares Under Options - Granted	5,000
Shares Under Options - Lapsed or Cancelled	-10,000
Shares Under Options - Outstanding, ending balance	10,000
Shares Under Options - Options exercisable	5,000
Shares Under Options - Available for grant	4,466,143
Weighted Average Exercise Price - Outstanding, beginning balance	$40.54
Weighted Average Exercise Price - Granted	$21.25
Weighted Average Exercise Price - Lapsed or Cancelled	$38.07
Weighted Average Exercise Price - Outstanding, ending balance	$33.36
Outstanding stock option price range, lower range	$21.25
Outstanding stock option price range, upper range	$45.47

MackCali_Realty_LPs_Partners_C8

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Weighted Average Assumptions) (Details)	9 Months Ended
	Sep. 30, 2014
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'
Expected life (in years)	'6 years
Risk-free interest rate	1.50%
Volatility	20.26%
Dividend yield	5.65%

MackCali_Realty_LPs_Partners_C9

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Restricted Stock Awards) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013
	item
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'		'
Unvested restricted stock outstanding, beginning balance	153,560	[1]	'
Shares, Granted	208,589	[2]	'
Shares, Vested	-183,214		'
Shares, Forfeited	-119		'
Unvested restricted stock outstanding, ending balance	178,816		153,560	[1]
Weighted-Average Grant - Date Fair Value, Outstanding beginning balance	$25.20	[1]	'
Weighted-Average Grant - Date Fair Value, Granted	$20.83	[2]	'
Weighted-Average Grant - Date Fair Value, Vested	$22.37		'
Weighted-Average Grant - Date Fair Value, Forfeited	$26.36		'
Weighted-Average Grant - Date Fair Value, Outstanding ending balance	$23		$25.20	[1]
Unvested performance shares	42,000		63,933
Number of executive officers who departed	2		'
Executive Officer [Member]	'		'
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]	'		'
Shares, Granted	87,734		'
[1]	Includes 63,933 Performance Shares which were legally granted in 2013 for which the 2013 performance goals were not met, which may be earned if subsequent yearsb performance goals are met.
[2]	Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014. Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.

Recovered_Sheet1

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit Tables - Basic Computation Of EPU) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'	'	'	'
Income (loss) from continuing operations	$2,085	($46,046)	$41,804	($29,506)
Add: Noncontrolling interest in consolidated joint ventures	145	1,838	757	1,962
Income (loss) from continuing operations available to common unitholders	2,230	-44,208	42,561	-27,544
Income from discontinued operations available to common unitholders	'	49,485	'	72,218
Net income (loss) available to common unitholders	$2,230	$5,277	$42,561	$44,674
Weighted average common units	99,995	99,787	99,955	99,778
Income (loss) from continuing operations available to common unitholders	$0.02	($0.44)	$0.43	($0.28)
Income from discontinued operations available to common unitholders	'	$0.49	'	$0.73
Net income (loss) available to common unitholders	$0.02	$0.05	$0.43	$0.45

Recovered_Sheet2

Mack-Cali Realty, L.P's Partners' Capital (Earnings Per Unit Tables - Diluted Computation Of EPU) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'	'	'	'
Income (loss) from continuing operations available to common unitholders	$2,230	($44,208)	$42,561	($27,544)
Income from discontinued operations for diluted earnings per unit	'	49,485	'	72,218
Net income (loss) available to common unitholders	$2,230	$5,277	$42,561	$44,674
Weighted average common unit	100,052	99,787	100,014	99,778
Income (loss) from continuing operations available to common unitholders	$0.02	($0.44)	$0.43	($0.28)
Income from discontinued operations available to common unitholders	'	$0.49	'	$0.73
Net income (loss) available to common unitholders	$0.02	$0.05	$0.43	$0.45

Recovered_Sheet3

Mack-Cali Realty, L.P's Partners' Capital (Schedule Of Reconciliation Of Units Used In Basic EPU Calculation To Units Used In Diluted EPU Calculation) (Details)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Mack-Cali Realty, L.P's Partners' Capital [Abstract]	'	'	'	'
Basic EPU units	99,995	99,787	99,955	99,778
Add: Restricted Stock Awards	57	'	59	'
Diluted EPU Units	100,052	99,787	100,014	99,778

Noncontrolling_Interests_In_Co1

Noncontrolling Interests In Consolidated Joint Ventures (Narrative) (Details) (Participation Rights [Member])	9 Months Ended
	Sep. 30, 2014
	property
Noncontrolling Interest [Line Items]	'
Number of properties	3
Percentage of excess net cash flow	50.00%
Internal rate of return	10.00%
Future Developments [Member]	'
Noncontrolling Interest [Line Items]	'
Number of properties	1

Noncontrolling_Interest_In_Con1

Noncontrolling Interest In Consolidated Joint Ventures (Schedule Of Activity Of Noncontrolling Interests) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Noncontrolling Interest [Line Items]	'	'	'	'
Balance, value	'	'	$1,918,455	'
Net income	2,085	3,439	41,804	42,712
Increase in noncontrolling interest	'	'	487	'
Balance, value	1,904,283	'	1,904,283	'
General Partner Common Unitholders [Member]	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'
Balance, value	'	'	1,585,100	'
Net income	'	'	37,807	'
Balance, value	1,587,448	'	1,587,448	'
Limited Partner Common Unitholders [Member]	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'
Balance, value	'	'	278,072	'
Net income	'	'	4,754	'
Balance, value	261,822	'	261,822	'
Noncontrolling Interest In Consolidated Joint Ventures [Member]	'	'	'	'
Noncontrolling Interest [Line Items]	'	'	'	'
Balance, value	'	'	55,283	56,442
Net income	'	'	-757	-1,962
Increase in noncontrolling interest	'	'	487	1,570
Balance, value	$55,013	$56,050	$55,013	$56,050

Employee_Benefit_401k_Plans_An1

Employee Benefit 401(k) Plans And Deferred Retirement Compensation Agreements (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
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	'	'	'Participants are always 100 percent vested in their pre-tax contributions and will begin vesting in any matching or profit sharing contributions made on their behalf after two years of service with the Corporation at a rate of 20 percent per year, becoming 100 percent vested after a total of six years of service with the Corporation.		'
Expenses for employee benefit plan	$24,000	$24,000	$77,000		$91,000
Shares granted	'	'	208,589	[1]	'
Shares issued for accrued dividends	'	'	966		'
Period upon which stock units become payable following a triggering event	'	'	'30 days		'
Minimum [Member]	'	'	'		'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'		'
Employer contribution vesting period	'	'	'2 years		'
Maximum [Member]	'	'	'		'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'		'
Employer contribution vesting period	'	'	'6 years		'
Messr Hersh [Member]	'	'	'		'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'		'
Amount of annual employer contribution to deferred retirement compensation	'	'	500,000		'
Messr Lefkowitz And Messr Thomas [Member]	'	'	'		'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'		'
Expenses for employee benefit plan	'	'	1,200,000		'
Deferred Retirement Compensation Units [Member]	'	'	'		'
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]	'	'	'		'
Expenses for employee benefit plan	$47,000	$114,000	$1,300,000		$455,000
Shares granted	'	'	36,347		'
[1]	Includes 42,000 Performance Shares which were legally granted in 2013 for which the 2014 performance goals were set by the Committee on March 31, 2014. Also includes 87,734 shares which were additionally granted to two executive officers in connection with their departure effective March 31, 2014, which vested on April 1, 2014.

Disclosure_Of_Fair_Value_Of_Fi1

Disclosure Of Fair Value Of Financial Instruments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Disclosure Of Fair Value Of Financial Instruments [Abstract]	'	'
Fair value of Company's long-term debt	$2,283,232,000	$2,407,802,000
Book value of Company's long-term debt	$2,238,641,000	$2,362,766,000

Commitments_And_Contingencies_1

Commitments And Contingencies (Tax Abatement Agreements) (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Harborside Financial Center Plaza 4A [Member]	'	'	'	'
Commitments And Contingencies [Line Items]	'	'	'	'
Project period	'	'	'20 years	'
Percentage of PILOT on project costs	'	'	2.00%	'
Total project costs	'	'	$49,500,000	'
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 [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_Contingencies_2

Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Commitments And Contingencies [Abstract]	'	'	'	'
Ground lease expense incurred	$102,000	$102,000	$305,000	$305,000

Commitments_And_Contingencies_3

Commitments And Contingencies (Roseland Contingent Consideration) (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

1 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 17, 2014

Mar. 21, 2014

Jan. 25, 2013

Apr. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Assets [Member]

Completion Of Certain Developments [Member]

Start Of Construction On Certain Developments [Member]

Completion/Start Of Certain Developments [Member]

Completion/Start Of Certain Developments [Member]

Obtaining Of Tax Credits/Grants [Member]

Total Return To Shareholders [Member]

Failure To Achieve A Certain Level Of Fee Revenue [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Minimum [Member]

Maximum [Member]

Business Acquisition, Contingent Consideration [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of contingent consideration

'

'

'

'

'

'

'

'

$10,000,000

$10,000,000

$6,300,000

'

'

'

'

'

$3,700,000

'

Business acquisition, contingent cash payment

'

'

'

'

'

'

'

'

15,600,000

15,600,000

8,600,000

2,800,000

2,800,000

'

'

3,000,000

7,000,000

2,000,000

Business acquisition, earn out period

'

'

'

'

'

'

'

'

'

'3 years

'

'

'

'

'

'

'3 years

'

Interest and other investment income

908,000

187,000

2,216,000

1,287,000

'

'

'

'

380,000

'

'

'

'

'

'

'

'

'

Probability of occurrence

'

'

'

'

'

'

'

'

'

'

'

'

'

92.00%

99.00%

50.00%

'

'

Earn out paid

'

'

5,228,000

2,755,000

1,400,000

1,400,000

2,800,000

'

'

'

'

'

'

'

'

1,000,000

'

'

Contingent purchase price measurement period

'

'

'

'

'

'

'

'

'

'33 months

'

'

'

'

'

'

'

'

Amount of escrow released

'

'

'

'

'

'

'

$6,700,000

'

$34,000,000

'

'

'

'

'

'

'

'

Commitments_And_Contingencies_4

Commitments And Contingencies (Departure Of Executive Vice Presidents) (Narrative) (Details) (USD $)	9 Months Ended			9 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
	item		Employee Severance [Member]	Messr Lefkowitz [Member]	Messr Thomas [Member]	Messr Thomas [Member]
Commitments And Contingencies [Line Items]	'	'	'	'	'	'
Severance benefits	$11,000,000	'	'	$3,400,000	'	$3,100,000
Stock options vested	'	'	'	11,457	'	33,605
Restricted stock units vested	183,214	'	'	68,667	'	41,000
Period for continuation of health insurance	'	'	'	'48 months	'	'48 months
Consulting payment	'	'	'	'	300,000	'
Number of executive officers who departed	2	'	'	'	'	'
Accounts payable, accrued expenses and other liabilities	$126,580,000	$121,286,000	$8,000,000	'	'	'

Commitments_And_Contingencies_5

Commitments And Contingencies (Roseland Transaction Modifications) (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

12 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Oct. 23, 2015

Oct. 28, 2014

Apr. 24, 2015

Sep. 17, 2014

Mar. 21, 2014

Jan. 25, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Minimum [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Scenario, Forecast [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Roseland Partners, L.L.C. [Member]

Messieur Goldberg [Member]

Messieur Klatt And Messieur Goldberg [Member]

Messieur Klatt And Messieur Goldberg [Member]

Messr Tycher [Member]

Obtaining Of Tax Credits/Grants [Member]

item

Minimum [Member]

Commitments And Contingencies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Consulting payment

'

'

'

'

'

$400,000

'

'

'

'

'

'

'

'

'

Number of installments

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

Severance benefits

'

'

11,000,000

'

'

'

750,000

500,000

'

'

'

'

'

'

'

Percentage of ownership interest

'

[1]

'

'

[1]

'

7.50%

'

'

'

'

'

'

'

'

50.00%

'

Earn out paid

'

'

5,228,000

2,755,000

'

'

'

'

1,400,000

1,400,000

2,800,000

'

'

'

1,000,000

General and administrative

$12,665,000

$12,151,000

$49,219,000

$37,235,000

'

'

'

'

'

'

'

$1,100,000

$1,100,000

'

'

[1]

Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

Commitments_And_Contingencies_6

Commitments And Contingencies (Joint Venture Interests Agreement And Other) (Narrative) (Details) (USD $)	9 Months Ended					9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Jul. 31, 2012	Sep. 30, 2014
				Property Lock-Ups [Member]	Property Lock-Ups Expired [Member]	Wegmans Food Markets, Inc. [Member]	Wegmans Food Markets, Inc. [Member]	Multi-Family Properties [Member]
				property	property		sqft	item
Commitments And Contingencies [Line Items]	'		'	'	'	'	'	'
Acquisition cost	$57,568,000		$32,235,000	'	'	'	'	'
Percentage of interest in venture	'	[1]	'	'	'	'	'	'
Number of units	'		'	'	'	'	'	4,940
Number of properties	'		'	7	110	'	'	'
Properties aggregate net book value	'		'	125,200,000	1,300,000,000	'	'	'
Expiration year	'		'	'2016	'	'	'	'
Total project costs	'		'	'	'	15,700,000	'	'
Costs of the project incurred	'		'	'	'	$7,000,000	'	'
Delivery date to tenant	'		'	'	'	'third quarter of 2015	'	'
Area of property (in square feet)	'		'	'	'	'	140,000	'
[1]	Company's effective ownership % represents the Company's entitlement to residual distributions after payments of priority returns, where applicable.

Commitments_And_Contingencies_7

Commitments And Contingencies (Future Minimum Rental Payments Of Ground Leases) (Details) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Commitments And Contingencies [Abstract]	'
October 1 through December 31, 2014	$92
2015	371
2016	371
2017	267
2018	232
2019 through 2084	15,818
Total	$17,151

Tenant_Leases_Details

Tenant Leases (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Property Subject to or Available for Operating Lease [Line Items]	'
October 1 through December 31, 2014	118,687
2015	445,922
2016	408,691
2017	357,819
2018	276,297
2019 and thereafter	1,067,223
Total	2,674,639
Tenant Leases [Member]	'
Property Subject to or Available for Operating Lease [Line Items]	'
Operating leases with various expiration dates through year	31-Dec-35
Multi-Family Properties [Member]	'
Property Subject to or Available for Operating Lease [Line Items]	'
Lease period	'1 year

Segment_Reporting_Narrative_De

Segment Reporting (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'
Number of business segments	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 $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]	'		'		'		'		'
Total revenues	$155,489		$162,505		$485,385		$501,764		'
Total operating and interest expenses	110,417	[1]	113,528	[1]	364,690	[1]	345,389	[1]	'
Equity in earnings (loss) of unconsolidated joint ventures	-1,268		-229		-2,060		-2,059		'
Net operating income (loss)	43,804	[2]	48,748	[2]	118,635	[2]	154,316	[2]	'
Total assets	4,357,197		'		4,357,197		'		4,515,328
Total long-lived assets	3,657,039	[3]	'		3,657,039	[3]	'		3,868,193	[3]
Investments in unconsolidated joint ventures	239,767		'		239,767		'		181,129
Real Estate - Commercial And Other [Member]	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Total revenues	142,486		155,129		447,779		469,026		'
Total operating and interest expenses	69,315	[1]	71,356	[1]	226,798	[1]	207,637	[1]	'
Equity in earnings (loss) of unconsolidated joint ventures	328		1,919		3,145		5,149		'
Net operating income (loss)	73,499	[2]	85,692	[2]	224,126	[2]	266,538	[2]	'
Total assets	3,861,779		'		3,861,779		'		3,886,574
Total long-lived assets	3,333,851	[3]	'		3,333,851	[3]	'		3,620,494	[3]
Investments in unconsolidated joint ventures	82,012		'		82,012		'		53,160
Real Estate - Multi Family [Member]	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Total revenues	6,459		3,736		18,593		8,673		'
Total operating and interest expenses	3,271	[1]	1,960	[1]	8,976	[1]	4,066	[1]	'
Equity in earnings (loss) of unconsolidated joint ventures	-2,088		-2,830		-6,566		-7,890		'
Net operating income (loss)	1,100	[2]	-1,054	[2]	3,051	[2]	-3,283	[2]	'
Total assets	460,998		'		460,998		'		377,237
Total long-lived assets	315,841	[3]	'		315,841	[3]	'		240,501	[3]
Investments in unconsolidated joint ventures	157,215		'		157,215		'		127,276
Multi Family Services [Member]	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Total revenues	8,300	[4]	6,867	[5]	22,650	[6]	18,745	[7]	'
Total operating and interest expenses	10,249	[1]	8,214	[1]	28,790	[1]	23,345	[1]	'
Equity in earnings (loss) of unconsolidated joint ventures	492		682		1,361		682		'
Net operating income (loss)	-1,457	[2]	-665	[2]	-4,779	[2]	-3,918	[2]	'
Total assets	10,648		'		10,648		'		10,488
Total long-lived assets	3,909	[3]	'		3,909	[3]	'		3,468	[3]
Investments in unconsolidated joint ventures	540		'		540		'		693
Fee revenue	1,199		665		2,962		1,432		'
Corporate And Other [Member]	'		'		'		'		'
Segment Reporting Information [Line Items]	'		'		'		'		'
Total revenues	-1,756	[8]	-3,227	[8]	-3,637	[8]	5,320	[8]	'
Total operating and interest expenses	27,582	[1],[8]	31,998	[1],[8]	100,126	[1],[8]	110,341	[1],[8]	'
Net operating income (loss)	-29,338	[2],[8]	-35,225	[2],[8]	-103,763	[2],[8]	-105,021	[2],[8]	'
Total assets	23,772	[8]	'		23,772	[8]	'		241,029	[8]
Total long-lived assets	$3,438	[3],[8]	'		$3,438	[3],[8]	'		$3,730	[3],[8]
[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 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 bab), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.
[3]	Long-lived assets are comprised of net investment in rental property, unbilled rents receivable and goodwill.
[4]	Includes $1,199 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[5]	Includes $665 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[6]	Includes $2,962 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[7]	Includes $1,432 of fees earned for this period from the multi-family real estate segment, which are eliminated in consolidation.
[8]	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.

Segment_Reporting_Schedule_Of_

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting [Abstract]	'		'		'		'
Net operating income	$43,804	[1]	$48,748	[1]	$118,635	[1]	$154,316	[1]
Depreciation and amortization	-41,983		-46,094		-131,679		-135,122
Realized gains (losses) on disposition of rental property, net	264		'		54,848		'
Impairments	'		-48,700		'		-48,700
Income from continuing operations	2,085		-46,046		41,804		-29,506
Income from discontinued operations	'		2,164		'		11,842
Loss from early extinguishment of debt	'		'		'		-703
Realized gains (losses) on disposition of rental property, net	'		47,321		'		61,079
Total discontinued operations	'		49,485		'		72,218
Net income	2,085		3,439		41,804		42,712
Noncontrolling interest in consolidated joint ventures	145		1,838		757		1,962
Net income available to common unitholders	$2,230		$5,277		$42,561		$44,674
[1]	Net operating income represents total revenues less total operating and interest expenses (as defined in Note bab), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.