Real Estate Investments And Accumulated Depreciation (Schedule Of Real Estate Investments And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Related Encumbrances	$ 757,495
Initial Costs, Land	770,975
Initial Costs, Building and Improvements	3,727,948
Costs Capitalized Subsequent to Acquisition	880,514
Gross Amount at Which Carried at Close of Period, Land	782,315	[1]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,597,121	[1]
Total	5,379,436	[2]
Accumulated Depreciation	1,478,214	[3]
Projects Under Development And Developable Land [Member]
Related Encumbrances	81,004
Initial Costs, Land	147,801
Initial Costs, Building and Improvements	192,618
Gross Amount at Which Carried at Close of Period, Land	147,801	[1]
Gross Amount at Which Carried at Close of Period, Building and Improvements	192,618	[1]
Total	340,419	[2]
Accumulated Depreciation	90	[3]
Furniture, Fixtures And Equipment [Member]
Costs Capitalized Subsequent to Acquisition	3,041
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,041	[1]
Total	3,041	[2]
Accumulated Depreciation	2,369	[3]
New Jersey [Member] | Bergen County [Member] | Fair Lawn [Member] | 17-17 Rte 208 North [Member]
Year Built	1987	[4]
Acquired	1995	[4]
Initial Costs, Land	3,067	[4]
Initial Costs, Building and Improvements	19,415	[4]
Costs Capitalized Subsequent to Acquisition	4,098	[4]
Gross Amount at Which Carried at Close of Period, Land	3,067	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,513	[1],[4]
Total	26,580	[2],[4]
Accumulated Depreciation	9,785	[3],[4]
New Jersey [Member] | Bergen County [Member] | Fort Lee [Member] | One Bridge Plaza [Member]
Year Built	1981	[4]
Acquired	1996	[4]
Initial Costs, Land	2,439	[4]
Initial Costs, Building and Improvements	24,462	[4]
Costs Capitalized Subsequent to Acquisition	8,027	[4]
Gross Amount at Which Carried at Close of Period, Land	2,439	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	32,489	[1],[4]
Total	34,928	[2],[4]
Accumulated Depreciation	12,997	[3],[4]
New Jersey [Member] | Bergen County [Member] | Fort Lee [Member] | 2115 Linwood Avenue [Member]
Year Built	1981	[4]
Acquired	1998	[4]
Initial Costs, Land	474	[4]
Initial Costs, Building and Improvements	4,419	[4]
Costs Capitalized Subsequent to Acquisition	5,182	[4]
Gross Amount at Which Carried at Close of Period, Land	474	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,601	[1],[4]
Total	10,075	[2],[4]
Accumulated Depreciation	2,920	[3],[4]
New Jersey [Member] | Bergen County [Member] | Little Ferry [Member] | 200 Riser Road [Member]
Year Built	1974	[4]
Acquired	1997	[4]
Initial Costs, Land	3,888	[4]
Initial Costs, Building and Improvements	15,551	[4]
Costs Capitalized Subsequent to Acquisition	498	[4]
Gross Amount at Which Carried at Close of Period, Land	3,888	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	16,049	[1],[4]
Total	19,937	[2],[4]
Accumulated Depreciation	5,941	[3],[4]
New Jersey [Member] | Bergen County [Member] | Lyndhurst [Member] | 210 Clay Avenue [Member]
Year Built	1978	[4]
Acquired	2009	[4]
Related Encumbrances	12,275	[4]
Initial Costs, Land	2,300	[4]
Initial Costs, Building and Improvements	11,189	[4]
Costs Capitalized Subsequent to Acquisition	12	[4]
Gross Amount at Which Carried at Close of Period, Land	2,300	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,201	[1],[4]
Total	13,501	[2],[4]
Accumulated Depreciation	1,796	[3],[4]
New Jersey [Member] | Bergen County [Member] | Montvale [Member] | 135 Chestnut Ridge Road [Member]
Year Built	1981	[4]
Acquired	1997	[4]
Initial Costs, Land	2,587	[4]
Initial Costs, Building and Improvements	10,350	[4]
Costs Capitalized Subsequent to Acquisition	1,549	[4]
Gross Amount at Which Carried at Close of Period, Land	2,588	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,898	[1],[4]
Total	14,486	[2],[4]
Accumulated Depreciation	4,324	[3],[4]
New Jersey [Member] | Bergen County [Member] | Paramus [Member] | 15 East Midland Avenue [Member]
Year Built	1988	[4]
Acquired	1997	[4]
Related Encumbrances	12,938	[4]
Initial Costs, Land	10,375	[4]
Initial Costs, Building and Improvements	41,497	[4]
Costs Capitalized Subsequent to Acquisition	663	[4]
Gross Amount at Which Carried at Close of Period, Land	10,374	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	42,161	[1],[4]
Total	52,535	[2],[4]
Accumulated Depreciation	15,755	[3],[4]
New Jersey [Member] | Bergen County [Member] | Paramus [Member] | 140 East Ridgewood [Member]
Year Built	1981	[4]
Acquired	1997	[4]
Related Encumbrances	12,191	[4]
Initial Costs, Land	7,932	[4]
Initial Costs, Building and Improvements	31,463	[4]
Costs Capitalized Subsequent to Acquisition	6,166	[4]
Gross Amount at Which Carried at Close of Period, Land	7,932	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	37,629	[1],[4]
Total	45,561	[2],[4]
Accumulated Depreciation	14,317	[3],[4]
New Jersey [Member] | Bergen County [Member] | Paramus [Member] | 461 From Road [Member]
Year Built	1988	[4]
Acquired	1997	[4]
Initial Costs, Land	13,194	[4]
Initial Costs, Building and Improvements	52,778	[4]
Costs Capitalized Subsequent to Acquisition	998	[4]
Gross Amount at Which Carried at Close of Period, Land	13,194	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	53,776	[1],[4]
Total	66,970	[2],[4]
Accumulated Depreciation	20,037	[3],[4]
New Jersey [Member] | Bergen County [Member] | Paramus [Member] | 650 From Road [Member]
Year Built	1978	[4]
Acquired	1997	[4]
Related Encumbrances	23,387	[4]
Initial Costs, Land	10,487	[4]
Initial Costs, Building and Improvements	41,949	[4]
Costs Capitalized Subsequent to Acquisition	7,584	[4]
Gross Amount at Which Carried at Close of Period, Land	10,487	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	49,533	[1],[4]
Total	60,020	[2],[4]
Accumulated Depreciation	19,976	[3],[4]
New Jersey [Member] | Bergen County [Member] | Paramus [Member] | 61 South Paramus Road [Member]
Year Built	1985	[4],[5]
Acquired	1997	[4],[5]
Related Encumbrances	22,890	[4],[5]
Initial Costs, Land	9,005	[4],[5]
Initial Costs, Building and Improvements	36,018	[4],[5]
Costs Capitalized Subsequent to Acquisition	6,647	[4],[5]
Gross Amount at Which Carried at Close of Period, Land	9,005	[1],[4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements	42,665	[1],[4],[5]
Total	51,670	[2],[4],[5]
Accumulated Depreciation	16,153	[3],[4],[5]
New Jersey [Member] | Bergen County [Member] | Rochelle Park [Member] | 120 West Passaic Street [Member]
Year Built	1972	[4]
Acquired	1997	[4]
Initial Costs, Land	1,354	[4]
Initial Costs, Building and Improvements	5,415	[4]
Costs Capitalized Subsequent to Acquisition	415	[4]
Gross Amount at Which Carried at Close of Period, Land	1,357	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,827	[1],[4]
Total	7,184	[2],[4]
Accumulated Depreciation	2,106	[3],[4]
New Jersey [Member] | Bergen County [Member] | Rochelle Park [Member] | 365 West Passaic Street [Member]
Year Built	1976	[4]
Acquired	1997	[4]
Related Encumbrances	12,191	[4]
Initial Costs, Land	4,148	[4]
Initial Costs, Building and Improvements	16,592	[4]
Costs Capitalized Subsequent to Acquisition	4,092	[4]
Gross Amount at Which Carried at Close of Period, Land	4,148	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	20,684	[1],[4]
Total	24,832	[2],[4]
Accumulated Depreciation	7,900	[3],[4]
New Jersey [Member] | Bergen County [Member] | Rochelle Park [Member] | 395 West Passaic Street [Member]
Year Built	1979	[4]
Acquired	2006	[4]
Related Encumbrances	10,231	[4]
Initial Costs, Land	2,550	[4]
Initial Costs, Building and Improvements	17,131	[4]
Costs Capitalized Subsequent to Acquisition	351	[4]
Gross Amount at Which Carried at Close of Period, Land	2,550	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	17,482	[1],[4]
Total	20,032	[2],[4]
Accumulated Depreciation	3,184	[3],[4]
New Jersey [Member] | Bergen County [Member] | Upper Saddle River [Member] | 1 Lake Street [Member]
Year Built	1994	[4]
Acquired	1997	[4]
Related Encumbrances	41,799	[4]
Initial Costs, Land	13,952	[4]
Initial Costs, Building and Improvements	55,812	[4]
Costs Capitalized Subsequent to Acquisition	1,409	[4]
Gross Amount at Which Carried at Close of Period, Land	13,953	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	57,220	[1],[4]
Total	71,173	[2],[4]
Accumulated Depreciation	21,166	[3],[4]
New Jersey [Member] | Bergen County [Member] | Upper Saddle River [Member] | 10 Mountainview Road [Member]
Year Built	1986	[4]
Acquired	1998	[4]
Initial Costs, Land	4,240	[4]
Initial Costs, Building and Improvements	20,485	[4]
Costs Capitalized Subsequent to Acquisition	3,188	[4]
Gross Amount at Which Carried at Close of Period, Land	4,240	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,673	[1],[4]
Total	27,913	[2],[4]
Accumulated Depreciation	9,405	[3],[4]
New Jersey [Member] | Bergen County [Member] | Woodcliff Lake [Member] | 400 Chestnut Ridge Road [Member]
Year Built	1982	[4]
Acquired	1997	[4]
Initial Costs, Land	4,201	[4]
Initial Costs, Building and Improvements	16,802	[4]
Costs Capitalized Subsequent to Acquisition	5,080	[4]
Gross Amount at Which Carried at Close of Period, Land	4,201	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	21,882	[1],[4]
Total	26,083	[2],[4]
Accumulated Depreciation	10,213	[3],[4]
New Jersey [Member] | Bergen County [Member] | Woodcliff Lake [Member] | 470 Chestnut Ridge Road [Member]
Year Built	1987	[4]
Acquired	1997	[4]
Initial Costs, Land	2,346	[4]
Initial Costs, Building and Improvements	9,385	[4]
Costs Capitalized Subsequent to Acquisition	1,810	[4]
Gross Amount at Which Carried at Close of Period, Land	2,346	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,195	[1],[4]
Total	13,541	[2],[4]
Accumulated Depreciation	4,404	[3],[4]
New Jersey [Member] | Bergen County [Member] | Woodcliff Lake [Member] | 530 Chestnut Ridge Road [Member]
Year Built	1986	[4]
Acquired	1997	[4]
Initial Costs, Land	1,860	[4]
Initial Costs, Building and Improvements	7,441	[4]
Costs Capitalized Subsequent to Acquisition	818	[4]
Gross Amount at Which Carried at Close of Period, Land	1,860	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,259	[1],[4]
Total	10,119	[2],[4]
Accumulated Depreciation	2,841	[3],[4]
New Jersey [Member] | Bergen County [Member] | Woodcliff Lake [Member] | 50 Tice Boulevard [Member]
Year Built	1984	[4]
Acquired	1994	[4]
Related Encumbrances	23,885	[4]
Initial Costs, Land	4,500	[4]
Costs Capitalized Subsequent to Acquisition	26,115	[4]
Gross Amount at Which Carried at Close of Period, Land	4,500	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	26,115	[1],[4]
Total	30,615	[2],[4]
Accumulated Depreciation	16,497	[3],[4]
New Jersey [Member] | Bergen County [Member] | Woodcliff Lake [Member] | 300 Tice Boulevard [Member]
Year Built	1991	[4]
Acquired	1996	[4]
Initial Costs, Land	5,424	[4]
Initial Costs, Building and Improvements	29,688	[4]
Costs Capitalized Subsequent to Acquisition	4,895	[4]
Gross Amount at Which Carried at Close of Period, Land	5,424	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	34,583	[1],[4]
Total	40,007	[2],[4]
Accumulated Depreciation	13,283	[3],[4]
New Jersey [Member] | Burlington County [Member] | Burlington [Member] | 3 Terri Lane [Member]
Year Built	1991	[6]
Acquired	1998	[6]
Initial Costs, Land	652	[6]
Initial Costs, Building and Improvements	3,433	[6]
Costs Capitalized Subsequent to Acquisition	2,052	[6]
Gross Amount at Which Carried at Close of Period, Land	658	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,479	[1],[6]
Total	6,137	[2],[6]
Accumulated Depreciation	2,372	[3],[6]
New Jersey [Member] | Burlington County [Member] | Burlington [Member] | 5 Terri Lane [Member]
Year Built	1992	[6]
Acquired	1998	[6]
Initial Costs, Land	564	[6]
Initial Costs, Building and Improvements	3,792	[6]
Costs Capitalized Subsequent to Acquisition	2,644	[6]
Gross Amount at Which Carried at Close of Period, Land	569	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,431	[1],[6]
Total	7,000	[2],[6]
Accumulated Depreciation	2,620	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 2 Commerce Drive [Member]
Year Built	1986	[6]
Acquired	1999	[6]
Initial Costs, Land	723	[6]
Initial Costs, Building and Improvements	2,893	[6]
Costs Capitalized Subsequent to Acquisition	741	[6]
Gross Amount at Which Carried at Close of Period, Land	723	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,634	[1],[6]
Total	4,357	[2],[6]
Accumulated Depreciation	1,325	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 101 Commerce Drive [Member]
Year Built	1988	[6]
Acquired	1998	[6]
Initial Costs, Land	422	[6]
Initial Costs, Building and Improvements	3,528	[6]
Costs Capitalized Subsequent to Acquisition	436	[6]
Gross Amount at Which Carried at Close of Period, Land	426	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,960	[1],[6]
Total	4,386	[2],[6]
Accumulated Depreciation	1,561	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 102 Commerce Drive [Member]
Year Built	1987	[6]
Acquired	1999	[6]
Initial Costs, Land	389	[6]
Initial Costs, Building and Improvements	1,554	[6]
Costs Capitalized Subsequent to Acquisition	628	[6]
Gross Amount at Which Carried at Close of Period, Land	389	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,182	[1],[6]
Total	2,571	[2],[6]
Accumulated Depreciation	837	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 201 Commerce Drive [Member]
Year Built	1986	[6]
Acquired	1998	[6]
Initial Costs, Land	254	[6]
Initial Costs, Building and Improvements	1,694	[6]
Costs Capitalized Subsequent to Acquisition	480	[6]
Gross Amount at Which Carried at Close of Period, Land	258	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,170	[1],[6]
Total	2,428	[2],[6]
Accumulated Depreciation	965	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 202 Commerce Drive [Member]
Year Built	1988	[6]
Acquired	1999	[6]
Initial Costs, Land	490	[6]
Initial Costs, Building and Improvements	1,963	[6]
Costs Capitalized Subsequent to Acquisition	774	[6]
Gross Amount at Which Carried at Close of Period, Land	490	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,737	[1],[6]
Total	3,227	[2],[6]
Accumulated Depreciation	1,102	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 1 Executive Drive [Member]
Year Built	1989	[6]
Acquired	1998	[6]
Initial Costs, Land	226	[6]
Initial Costs, Building and Improvements	1,453	[6]
Costs Capitalized Subsequent to Acquisition	727	[6]
Gross Amount at Which Carried at Close of Period, Land	228	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,178	[1],[6]
Total	2,406	[2],[6]
Accumulated Depreciation	958	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 2 Executive Drive [Member]
Year Built	1988	[6]
Acquired	2000	[6]
Initial Costs, Land	801	[6]
Initial Costs, Building and Improvements	3,206	[6]
Costs Capitalized Subsequent to Acquisition	984	[6]
Gross Amount at Which Carried at Close of Period, Land	801	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,190	[1],[6]
Total	4,991	[2],[6]
Accumulated Depreciation	1,700	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 101 Executive Drive [Member]
Year Built	1990	[6]
Acquired	1998	[6]
Initial Costs, Land	241	[6]
Initial Costs, Building and Improvements	2,262	[6]
Costs Capitalized Subsequent to Acquisition	1,099	[6]
Gross Amount at Which Carried at Close of Period, Land	244	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,358	[1],[6]
Total	3,602	[2],[6]
Accumulated Depreciation	1,349	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 102 Executive Drive [Member]
Year Built	1990	[6]
Acquired	1998	[6]
Initial Costs, Land	353	[6]
Initial Costs, Building and Improvements	3,607	[6]
Costs Capitalized Subsequent to Acquisition	370	[6]
Gross Amount at Which Carried at Close of Period, Land	357	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,973	[1],[6]
Total	4,330	[2],[6]
Accumulated Depreciation	1,485	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 225 Executive Drive [Member]
Year Built	1990	[6]
Acquired	1998	[6]
Initial Costs, Land	323	[6]
Initial Costs, Building and Improvements	2,477	[6]
Costs Capitalized Subsequent to Acquisition	485	[6]
Gross Amount at Which Carried at Close of Period, Land	326	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,959	[1],[6]
Total	3,285	[2],[6]
Accumulated Depreciation	1,262	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 97 Foster Road [Member]
Year Built	1982	[6]
Acquired	1998	[6]
Initial Costs, Land	208	[6]
Initial Costs, Building and Improvements	1,382	[6]
Costs Capitalized Subsequent to Acquisition	430	[6]
Gross Amount at Which Carried at Close of Period, Land	211	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,809	[1],[6]
Total	2,020	[2],[6]
Accumulated Depreciation	735	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 1507 Lancer Drive [Member]
Year Built	1995	[6]
Acquired	1998	[6]
Initial Costs, Land	119	[6]
Initial Costs, Building and Improvements	1,106	[6]
Costs Capitalized Subsequent to Acquisition	220	[6]
Gross Amount at Which Carried at Close of Period, Land	120	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,325	[1],[6]
Total	1,445	[2],[6]
Accumulated Depreciation	463	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 1245 North Church Street [Member]
Year Built	1998	[6]
Acquired	2001	[6]
Initial Costs, Land	691	[6]
Initial Costs, Building and Improvements	2,810	[6]
Costs Capitalized Subsequent to Acquisition	135	[6]
Gross Amount at Which Carried at Close of Period, Land	691	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,945	[1],[6]
Total	3,636	[2],[6]
Accumulated Depreciation	921	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 1247 North Church Street [Member]
Year Built	1998	[6]
Acquired	2001	[6]
Initial Costs, Land	805	[6]
Initial Costs, Building and Improvements	3,269	[6]
Costs Capitalized Subsequent to Acquisition	293	[6]
Gross Amount at Which Carried at Close of Period, Land	805	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,562	[1],[6]
Total	4,367	[2],[6]
Accumulated Depreciation	1,138	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 1256 North Church Street [Member]
Year Built	1984	[6]
Acquired	1998	[6]
Initial Costs, Land	354	[6]
Initial Costs, Building and Improvements	3,098	[6]
Costs Capitalized Subsequent to Acquisition	741	[6]
Gross Amount at Which Carried at Close of Period, Land	357	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,836	[1],[6]
Total	4,193	[2],[6]
Accumulated Depreciation	1,443	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 840 North Lenola Road [Member]
Year Built	1995	[6]
Acquired	1998	[6]
Initial Costs, Land	329	[6]
Initial Costs, Building and Improvements	2,366	[6]
Costs Capitalized Subsequent to Acquisition	540	[6]
Gross Amount at Which Carried at Close of Period, Land	333	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,902	[1],[6]
Total	3,235	[2],[6]
Accumulated Depreciation	1,327	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 844 North Lenola Road [Member]
Year Built	1995	[6]
Acquired	1998	[6]
Initial Costs, Land	239	[6]
Initial Costs, Building and Improvements	1,714	[6]
Costs Capitalized Subsequent to Acquisition	511	[6]
Gross Amount at Which Carried at Close of Period, Land	241	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,223	[1],[6]
Total	2,464	[2],[6]
Accumulated Depreciation	940	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 915 North Lenola Road [Member]
Year Built	1998	[6]
Acquired	2000	[6]
Initial Costs, Land	508	[6]
Initial Costs, Building and Improvements	2,034	[6]
Costs Capitalized Subsequent to Acquisition	267	[6]
Gross Amount at Which Carried at Close of Period, Land	508	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,301	[1],[6]
Total	2,809	[2],[6]
Accumulated Depreciation	803	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 2 Twosome Drive [Member]
Year Built	2000	[6]
Acquired	2001	[6]
Initial Costs, Land	701	[6]
Initial Costs, Building and Improvements	2,807	[6]
Costs Capitalized Subsequent to Acquisition	284	[6]
Gross Amount at Which Carried at Close of Period, Land	701	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,091	[1],[6]
Total	3,792	[2],[6]
Accumulated Depreciation	1,044	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 30 Twosome Drive [Member]
Year Built	1997	[6]
Acquired	1998	[6]
Initial Costs, Land	234	[6]
Initial Costs, Building and Improvements	1,954	[6]
Costs Capitalized Subsequent to Acquisition	490	[6]
Gross Amount at Which Carried at Close of Period, Land	236	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,442	[1],[6]
Total	2,678	[2],[6]
Accumulated Depreciation	1,061	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 31 Twosome Drive [Member]
Year Built	1998	[6]
Acquired	2001	[6]
Initial Costs, Land	815	[6]
Initial Costs, Building and Improvements	3,276	[6]
Costs Capitalized Subsequent to Acquisition	186	[6]
Gross Amount at Which Carried at Close of Period, Land	815	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,462	[1],[6]
Total	4,277	[2],[6]
Accumulated Depreciation	1,085	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 40 Twosome Drive [Member]
Year Built	1996	[6]
Acquired	1998	[6]
Initial Costs, Land	297	[6]
Initial Costs, Building and Improvements	2,393	[6]
Costs Capitalized Subsequent to Acquisition	328	[6]
Gross Amount at Which Carried at Close of Period, Land	301	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,717	[1],[6]
Total	3,018	[2],[6]
Accumulated Depreciation	1,183	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 41 Twosome Drive [Member]
Year Built	1998	[6]
Acquired	2001	[6]
Initial Costs, Land	605	[6]
Initial Costs, Building and Improvements	2,459	[6]
Costs Capitalized Subsequent to Acquisition	69	[6]
Gross Amount at Which Carried at Close of Period, Land	605	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,528	[1],[6]
Total	3,133	[2],[6]
Accumulated Depreciation	784	[3],[6]
New Jersey [Member] | Burlington County [Member] | Moorestown [Member] | 50 Twosome Drive [Member]
Year Built	1997	[6]
Acquired	1998	[6]
Initial Costs, Land	301	[6]
Initial Costs, Building and Improvements	2,330	[6]
Costs Capitalized Subsequent to Acquisition	111	[6]
Gross Amount at Which Carried at Close of Period, Land	304	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,438	[1],[6]
Total	2,742	[2],[6]
Accumulated Depreciation	962	[3],[6]
New Jersey [Member] | Gloucester County [Member] | West Deptford [Member] | 1451 Metropolitan Drive [Member]
Year Built	1996	[6]
Acquired	1998	[6]
Initial Costs, Land	203	[6]
Initial Costs, Building and Improvements	1,189	[6]
Costs Capitalized Subsequent to Acquisition	57	[6]
Gross Amount at Which Carried at Close of Period, Land	206	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,243	[1],[6]
Total	1,449	[2],[6]
Accumulated Depreciation	481	[3],[6]
New Jersey [Member] | Essex County [Member] | Millburn [Member] | 150 J.F. Kennedy Parkway [Member]
Year Built	1980	[4]
Acquired	1997	[4]
Initial Costs, Land	12,606	[4]
Initial Costs, Building and Improvements	50,425	[4]
Costs Capitalized Subsequent to Acquisition	7,835	[4]
Gross Amount at Which Carried at Close of Period, Land	12,606	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	58,260	[1],[4]
Total	70,866	[2],[4]
Accumulated Depreciation	24,475	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 4 Becker Farm Road [Member]
Year Built	1983	[4]
Acquired	2009	[4]
Related Encumbrances	38,274	[4]
Initial Costs, Land	5,600	[4]
Initial Costs, Building and Improvements	38,285	[4]
Costs Capitalized Subsequent to Acquisition	1,663	[4]
Gross Amount at Which Carried at Close of Period, Land	5,600	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	39,948	[1],[4]
Total	45,548	[2],[4]
Accumulated Depreciation	5,020	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 5 Becker Farm Road [Member]
Year Built	1982	[4]
Acquired	2009	[4]
Related Encumbrances	12,507	[4]
Initial Costs, Land	2,400	[4]
Initial Costs, Building and Improvements	11,885	[4]
Costs Capitalized Subsequent to Acquisition	357	[4]
Gross Amount at Which Carried at Close of Period, Land	2,400	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	12,242	[1],[4]
Total	14,642	[2],[4]
Accumulated Depreciation	1,767	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 6 Becker Farm Road [Member]
Year Built	1983	[4]
Acquired	2009	[4]
Related Encumbrances	13,809	[4]
Initial Costs, Land	2,600	[4]
Initial Costs, Building and Improvements	15,548	[4]
Costs Capitalized Subsequent to Acquisition	443	[4]
Gross Amount at Which Carried at Close of Period, Land	2,600	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,991	[1],[4]
Total	18,591	[2],[4]
Accumulated Depreciation	1,982	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 101 Eisenhower Parkway [Member]
Year Built	1980	[4]
Acquired	1994	[4]
Initial Costs, Land	228	[4]
Costs Capitalized Subsequent to Acquisition	21,104	[4]
Gross Amount at Which Carried at Close of Period, Land	228	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	21,104	[1],[4]
Total	21,332	[2],[4]
Accumulated Depreciation	11,641	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 103 Eisenhower Parkway [Member]
Year Built	1985	[4]
Acquired	1994	[4]
Costs Capitalized Subsequent to Acquisition	15,265	[4]
Gross Amount at Which Carried at Close of Period, Land	2,300	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	12,965	[1],[4]
Total	15,265	[2],[4]
Accumulated Depreciation	8,071	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 105 Eisenhower Parkway [Member]
Year Built	2001	[4]
Acquired	2001	[4]
Initial Costs, Land	4,430	[4]
Initial Costs, Building and Improvements	42,898	[4]
Costs Capitalized Subsequent to Acquisition	6,859	[4]
Gross Amount at Which Carried at Close of Period, Land	3,835	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	50,352	[1],[4]
Total	54,187	[2],[4]
Accumulated Depreciation	20,810	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 75 Livingston Avenue [Member]
Year Built	1985	[4]
Acquired	2009	[4]
Related Encumbrances	10,568	[4]
Initial Costs, Land	1,900	[4]
Initial Costs, Building and Improvements	6,312	[4]
Costs Capitalized Subsequent to Acquisition	1,403	[4]
Gross Amount at Which Carried at Close of Period, Land	1,900	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,715	[1],[4]
Total	9,615	[2],[4]
Accumulated Depreciation	1,338	[3],[4]
New Jersey [Member] | Essex County [Member] | Borough Of Roseland [Member] | 85 Livingston Avenue [Member]
Year Built	1985	[4]
Acquired	2009	[4]
Related Encumbrances	14,795	[4]
Initial Costs, Land	2,500	[4]
Initial Costs, Building and Improvements	14,238	[4]
Costs Capitalized Subsequent to Acquisition	443	[4]
Gross Amount at Which Carried at Close of Period, Land	2,500	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	14,681	[1],[4]
Total	17,181	[2],[4]
Accumulated Depreciation	1,938	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 1 [Member]
Year Built	1983	[4]
Acquired	1996	[4]
Initial Costs, Land	3,923	[4]
Initial Costs, Building and Improvements	51,013	[4]
Costs Capitalized Subsequent to Acquisition	27,703	[4]
Gross Amount at Which Carried at Close of Period, Land	3,923	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	78,716	[1],[4]
Total	82,639	[2],[4]
Accumulated Depreciation	30,155	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 2 [Member]
Year Built	1990	[4]
Acquired	1996	[4]
Initial Costs, Land	17,655	[4]
Initial Costs, Building and Improvements	101,546	[4]
Costs Capitalized Subsequent to Acquisition	21,417	[4]
Gross Amount at Which Carried at Close of Period, Land	15,094	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	125,524	[1],[4]
Total	140,618	[2],[4]
Accumulated Depreciation	50,296	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 3 [Member]
Year Built	1990	[4]
Acquired	1996	[4]
Initial Costs, Land	17,655	[4]
Initial Costs, Building and Improvements	101,878	[4]
Costs Capitalized Subsequent to Acquisition	21,083	[4]
Gross Amount at Which Carried at Close of Period, Land	15,093	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	125,523	[1],[4]
Total	140,616	[2],[4]
Accumulated Depreciation	50,296	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 4A [Member]
Year Built	2000	[4]
Acquired	2000	[4]
Initial Costs, Land	1,244	[4]
Initial Costs, Building and Improvements	56,144	[4]
Costs Capitalized Subsequent to Acquisition	13,133	[4]
Gross Amount at Which Carried at Close of Period, Land	1,244	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	69,277	[1],[4]
Total	70,521	[2],[4]
Accumulated Depreciation	23,302	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | Harborside Financial Center Plaza 5 [Member]
Year Built	2002	[4]
Acquired	2002	[4]
Related Encumbrances	228,481	[4]
Initial Costs, Land	6,218	[4]
Initial Costs, Building and Improvements	170,682	[4]
Costs Capitalized Subsequent to Acquisition	51,717	[4]
Gross Amount at Which Carried at Close of Period, Land	5,705	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	222,912	[1],[4]
Total	228,617	[2],[4]
Accumulated Depreciation	67,310	[3],[4]
New Jersey [Member] | Hudson County [Member] | Jersey City [Member] | 101 Hudson Street [Member]
Year Built	1992	[4]
Acquired	2005	[4]
Initial Costs, Land	45,530	[4]
Initial Costs, Building and Improvements	271,376	[4]
Costs Capitalized Subsequent to Acquisition	8,003	[4]
Gross Amount at Which Carried at Close of Period, Land	45,530	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	279,379	[1],[4]
Total	324,909	[2],[4]
Accumulated Depreciation	64,538	[3],[4]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 3 AAA Drive [Member]
Year Built	1981	[4]
Acquired	2007	[4]
Initial Costs, Land	242	[4]
Initial Costs, Building and Improvements	3,218	[4]
Costs Capitalized Subsequent to Acquisition	1,519	[4]
Gross Amount at Which Carried at Close of Period, Land	242	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,737	[1],[4]
Total	4,979	[2],[4]
Accumulated Depreciation	980	[3],[4]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 100 Horizon Center Boulevard [Member]
Year Built	1989	[6]
Acquired	1995	[6]
Initial Costs, Land	205	[6]
Initial Costs, Building and Improvements	1,676	[6]
Costs Capitalized Subsequent to Acquisition	828	[6]
Gross Amount at Which Carried at Close of Period, Land	320	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,389	[1],[6]
Total	2,709	[2],[6]
Accumulated Depreciation	848	[3],[6]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 200 Horizon Drive [Member]
Year Built	1991	[6]
Acquired	1995	[6]
Initial Costs, Land	205	[6]
Initial Costs, Building and Improvements	3,027	[6]
Costs Capitalized Subsequent to Acquisition	741	[6]
Gross Amount at Which Carried at Close of Period, Land	353	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,620	[1],[6]
Total	3,973	[2],[6]
Accumulated Depreciation	1,420	[3],[6]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 300 Horizon Drive [Member]
Year Built	1989	[6]
Acquired	1995	[6]
Initial Costs, Land	379	[6]
Initial Costs, Building and Improvements	4,355	[6]
Costs Capitalized Subsequent to Acquisition	1,086	[6]
Gross Amount at Which Carried at Close of Period, Land	527	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,293	[1],[6]
Total	5,820	[2],[6]
Accumulated Depreciation	2,073	[3],[6]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 500 Horizon Drive [Member]
Year Built	1990	[6]
Acquired	1995	[6]
Initial Costs, Land	379	[6]
Initial Costs, Building and Improvements	3,395	[6]
Costs Capitalized Subsequent to Acquisition	1,270	[6]
Gross Amount at Which Carried at Close of Period, Land	492	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,552	[1],[6]
Total	5,044	[2],[6]
Accumulated Depreciation	2,133	[3],[6]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 600 Horizon Drive [Member]
Year Built	2002	[4]
Acquired	2002	[4]
Initial Costs, Building and Improvements	7,549	[4]
Costs Capitalized Subsequent to Acquisition	651	[4]
Gross Amount at Which Carried at Close of Period, Land	685	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,515	[1],[4]
Total	8,200	[2],[4]
Accumulated Depreciation	1,894	[3],[4]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 700 Horizon Drive [Member]
Year Built	2007	[4]
Acquired	2007	[4]
Initial Costs, Land	490	[4]
Initial Costs, Building and Improvements	43	[4]
Costs Capitalized Subsequent to Acquisition	16,572	[4]
Gross Amount at Which Carried at Close of Period, Land	865	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	16,240	[1],[4]
Total	17,105	[2],[4]
Accumulated Depreciation	2,546	[3],[4]
New Jersey [Member] | Mercer County [Member] | Hamilton Township [Member] | 2 South Gold Drive [Member]
Year Built	1974	[4]
Acquired	2007	[4]
Initial Costs, Land	476	[4]
Initial Costs, Building and Improvements	3,487	[4]
Costs Capitalized Subsequent to Acquisition	412	[4]
Gross Amount at Which Carried at Close of Period, Land	476	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,899	[1],[4]
Total	4,375	[2],[4]
Accumulated Depreciation	682	[3],[4]
New Jersey [Member] | Mercer County [Member] | Princeton [Member] | 103 Carnegie Center [Member]
Year Built	1984	[4]
Acquired	1996	[4]
Initial Costs, Land	2,566	[4]
Initial Costs, Building and Improvements	7,868	[4]
Costs Capitalized Subsequent to Acquisition	3,134	[4]
Gross Amount at Which Carried at Close of Period, Land	2,566	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,002	[1],[4]
Total	13,568	[2],[4]
Accumulated Depreciation	4,718	[3],[4]
New Jersey [Member] | Mercer County [Member] | Princeton [Member] | 2 Independence Way [Member]
Year Built	1985	[4]
Acquired	2009	[4]
Initial Costs, Land	1,300	[4]
Initial Costs, Building and Improvements	7,246	[4]
Costs Capitalized Subsequent to Acquisition	125	[4]
Gross Amount at Which Carried at Close of Period, Land	1,300	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,371	[1],[4]
Total	8,671	[2],[4]
Accumulated Depreciation	963	[3],[4]
New Jersey [Member] | Mercer County [Member] | Princeton [Member] | 3 Independence Way [Member]
Year Built	1983	[4]
Acquired	1997	[4]
Initial Costs, Land	1,997	[4]
Initial Costs, Building and Improvements	11,391	[4]
Costs Capitalized Subsequent to Acquisition	3,163	[4]
Gross Amount at Which Carried at Close of Period, Land	1,997	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	14,554	[1],[4]
Total	16,551	[2],[4]
Accumulated Depreciation	5,585	[3],[4]
New Jersey [Member] | Mercer County [Member] | Princeton [Member] | 100 Overlook Center [Member]
Year Built	1988	[4]
Acquired	1997	[4]
Initial Costs, Land	2,378	[4]
Initial Costs, Building and Improvements	21,754	[4]
Costs Capitalized Subsequent to Acquisition	4,034	[4]
Gross Amount at Which Carried at Close of Period, Land	2,378	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	25,788	[1],[4]
Total	28,166	[2],[4]
Accumulated Depreciation	10,356	[3],[4]
New Jersey [Member] | Mercer County [Member] | Princeton [Member] | 5 Vaughn Drive [Member]
Year Built	1987	[4]
Acquired	1995	[4]
Initial Costs, Land	657	[4]
Initial Costs, Building and Improvements	9,800	[4]
Costs Capitalized Subsequent to Acquisition	2,359	[4]
Gross Amount at Which Carried at Close of Period, Land	657	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	12,159	[1],[4]
Total	12,816	[2],[4]
Accumulated Depreciation	5,504	[3],[4]
New Jersey [Member] | Middlesex County [Member] | East Brunswick [Member] | 377 Summerhill Road [Member]
Year Built	1977	[4]
Acquired	1997	[4]
Initial Costs, Land	649	[4]
Initial Costs, Building and Improvements	2,594	[4]
Costs Capitalized Subsequent to Acquisition	412	[4]
Gross Amount at Which Carried at Close of Period, Land	649	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,006	[1],[4]
Total	3,655	[2],[4]
Accumulated Depreciation	1,175	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Edison [Member] | 343 Thornall Street [Member]
Year Built	1991	[4]
Acquired	2006	[4]
Initial Costs, Land	6,027	[4]
Initial Costs, Building and Improvements	39,101	[4]
Costs Capitalized Subsequent to Acquisition	4,504	[4]
Gross Amount at Which Carried at Close of Period, Land	6,027	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	43,605	[1],[4]
Total	49,632	[2],[4]
Accumulated Depreciation	9,748	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road, Building 3 [Member]
Year Built	1977	[4]
Acquired	2004	[4]
Initial Costs, Land	1,030	[4]
Initial Costs, Building and Improvements	7,269	[4]
Costs Capitalized Subsequent to Acquisition	346	[4]
Gross Amount at Which Carried at Close of Period, Land	1,034	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,611	[1],[4]
Total	8,645	[2],[4]
Accumulated Depreciation	1,650	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road, Building 4 [Member]
Year Built	1977	[4]
Acquired	2004	[4]
Initial Costs, Land	1,433	[4]
Initial Costs, Building and Improvements	10,121	[4]
Costs Capitalized Subsequent to Acquisition	385	[4]
Gross Amount at Which Carried at Close of Period, Land	1,429	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,510	[1],[4]
Total	11,939	[2],[4]
Accumulated Depreciation	2,279	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road, Building 5 [Member]
Year Built	1977	[4]
Acquired	2004	[4]
Initial Costs, Land	2,979	[4]
Initial Costs, Building and Improvements	21,035	[4]
Costs Capitalized Subsequent to Acquisition	10,365	[4]
Gross Amount at Which Carried at Close of Period, Land	2,979	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	31,400	[1],[4]
Total	34,379	[2],[4]
Accumulated Depreciation	9,494	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Piscataway [Member] | 30 Knightsbridge Road, Building 6 [Member]
Year Built	1977	[4]
Acquired	2004	[4]
Initial Costs, Land	448	[4]
Initial Costs, Building and Improvements	3,161	[4]
Costs Capitalized Subsequent to Acquisition	4,638	[4]
Gross Amount at Which Carried at Close of Period, Land	448	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,799	[1],[4]
Total	8,247	[2],[4]
Accumulated Depreciation	2,208	[3],[4]
New Jersey [Member] | Middlesex County [Member] | Plainsboro [Member] | 500 College Road East [Member]
Year Built	1984	[4],[5]
Acquired	1998	[4],[5]
Initial Costs, Land	614	[4],[5]
Initial Costs, Building and Improvements	20,626	[4],[5]
Costs Capitalized Subsequent to Acquisition	5,863	[4],[5]
Gross Amount at Which Carried at Close of Period, Land	614	[1],[4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements	26,489	[1],[4],[5]
Total	27,103	[2],[4],[5]
Accumulated Depreciation	9,414	[3],[4],[5]
New Jersey [Member] | Middlesex County [Member] | Woodbridge [Member] | 581 Main Street [Member]
Year Built	1991	[4]
Acquired	1997	[4]
Initial Costs, Land	3,237	[4]
Initial Costs, Building and Improvements	12,949	[4]
Costs Capitalized Subsequent to Acquisition	25,032	[4]
Gross Amount at Which Carried at Close of Period, Land	8,115	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	33,103	[1],[4]
Total	41,218	[2],[4]
Accumulated Depreciation	13,189	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Freehold [Member] | 2 Paragon Way [Member]
Year Built	1989	[4]
Acquired	2005	[4]
Initial Costs, Land	999	[4]
Initial Costs, Building and Improvements	4,619	[4]
Costs Capitalized Subsequent to Acquisition	761	[4]
Gross Amount at Which Carried at Close of Period, Land	999	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,380	[1],[4]
Total	6,379	[2],[4]
Accumulated Depreciation	1,150	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Freehold [Member] | 3 Paragon Way [Member]
Year Built	1991	[4]
Acquired	2005	[4]
Initial Costs, Land	1,423	[4]
Initial Costs, Building and Improvements	6,041	[4]
Costs Capitalized Subsequent to Acquisition	2,181	[4]
Gross Amount at Which Carried at Close of Period, Land	1,423	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,222	[1],[4]
Total	9,645	[2],[4]
Accumulated Depreciation	2,500	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Freehold [Member] | 4 Paragon Way [Member]
Year Built	2002	[4]
Acquired	2005	[4]
Initial Costs, Land	1,961	[4]
Initial Costs, Building and Improvements	8,827	[4]
Costs Capitalized Subsequent to Acquisition	(683)	[4]
Gross Amount at Which Carried at Close of Period, Land	1,961	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,144	[1],[4]
Total	10,105	[2],[4]
Accumulated Depreciation	1,524	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Freehold [Member] | 100 Willowbrook Road [Member]
Year Built	1988	[4]
Acquired	2005	[4]
Initial Costs, Land	1,264	[4]
Initial Costs, Building and Improvements	5,573	[4]
Costs Capitalized Subsequent to Acquisition	995	[4]
Gross Amount at Which Carried at Close of Period, Land	1,264	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,568	[1],[4]
Total	7,832	[2],[4]
Accumulated Depreciation	1,571	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Holmdel [Member] | 23 Main Street [Member]
Year Built	1977	[4]
Acquired	2005	[4]
Related Encumbrances	30,395	[4]
Initial Costs, Land	4,336	[4]
Initial Costs, Building and Improvements	19,544	[4]
Costs Capitalized Subsequent to Acquisition	9,133	[4]
Gross Amount at Which Carried at Close of Period, Land	4,336	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	28,677	[1],[4]
Total	33,013	[2],[4]
Accumulated Depreciation	8,992	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Middletown [Member] | One River Center, Building 1 [Member]
Year Built	1983	[4]
Acquired	2004	[4]
Related Encumbrances	11,162	[4]
Initial Costs, Land	3,070	[4]
Initial Costs, Building and Improvements	17,414	[4]
Costs Capitalized Subsequent to Acquisition	3,590	[4]
Gross Amount at Which Carried at Close of Period, Land	2,451	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	21,623	[1],[4]
Total	24,074	[2],[4]
Accumulated Depreciation	6,384	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Middletown [Member] | One River Center, Building 2 [Member]
Year Built	1983	[4]
Acquired	2004	[4]
Related Encumbrances	12,522	[4]
Initial Costs, Land	2,468	[4]
Initial Costs, Building and Improvements	15,043	[4]
Costs Capitalized Subsequent to Acquisition	3,108	[4]
Gross Amount at Which Carried at Close of Period, Land	2,452	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,167	[1],[4]
Total	20,619	[2],[4]
Accumulated Depreciation	3,956	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Middletown [Member] | One River Center, Building 3 [Member]
Year Built	1984	[4]
Acquired	2004	[4]
Related Encumbrances	19,898	[4]
Initial Costs, Land	4,051	[4]
Initial Costs, Building and Improvements	24,790	[4]
Costs Capitalized Subsequent to Acquisition	5,756	[4]
Gross Amount at Which Carried at Close of Period, Land	4,627	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	29,970	[1],[4]
Total	34,597	[2],[4]
Accumulated Depreciation	6,531	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Neptune [Member] | 3600 Route 66 [Member]
Year Built	1989	[4]
Acquired	1995	[4]
Initial Costs, Land	1,098	[4]
Initial Costs, Building and Improvements	18,146	[4]
Costs Capitalized Subsequent to Acquisition	1,567	[4]
Gross Amount at Which Carried at Close of Period, Land	1,098	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	19,713	[1],[4]
Total	20,811	[2],[4]
Accumulated Depreciation	8,340	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1305 Campus Parkway [Member]
Year Built	1988	[4]
Acquired	1995	[4]
Initial Costs, Land	335	[4]
Initial Costs, Building and Improvements	2,560	[4]
Costs Capitalized Subsequent to Acquisition	224	[4]
Gross Amount at Which Carried at Close of Period, Land	291	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,828	[1],[4]
Total	3,119	[2],[4]
Accumulated Depreciation	1,214	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1325 Campus Parkway [Member]
Year Built	1988	[6]
Acquired	1995	[6]
Initial Costs, Land	270	[6]
Initial Costs, Building and Improvements	2,928	[6]
Costs Capitalized Subsequent to Acquisition	665	[6]
Gross Amount at Which Carried at Close of Period, Land	270	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,593	[1],[6]
Total	3,863	[2],[6]
Accumulated Depreciation	1,419	[3],[6]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1340 Campus Parkway [Member]
Year Built	1992	[6]
Acquired	1995	[6]
Initial Costs, Land	489	[6]
Initial Costs, Building and Improvements	4,621	[6]
Costs Capitalized Subsequent to Acquisition	2,100	[6]
Gross Amount at Which Carried at Close of Period, Land	489	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,721	[1],[6]
Total	7,210	[2],[6]
Accumulated Depreciation	2,947	[3],[6]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1345 Campus Parkway [Member]
Year Built	1995	[6]
Acquired	1997	[6]
Initial Costs, Land	1,023	[6]
Initial Costs, Building and Improvements	5,703	[6]
Costs Capitalized Subsequent to Acquisition	1,866	[6]
Gross Amount at Which Carried at Close of Period, Land	1,024	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,568	[1],[6]
Total	8,592	[2],[6]
Accumulated Depreciation	3,091	[3],[6]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1350 Campus Parkway [Member]
Year Built	1990	[4]
Acquired	1995	[4]
Initial Costs, Land	454	[4]
Initial Costs, Building and Improvements	7,134	[4]
Costs Capitalized Subsequent to Acquisition	1,184	[4]
Gross Amount at Which Carried at Close of Period, Land	454	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,318	[1],[4]
Total	8,772	[2],[4]
Accumulated Depreciation	3,838	[3],[4]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1433 Highway 34 [Member]
Year Built	1985	[6]
Acquired	1995	[6]
Initial Costs, Land	889	[6]
Initial Costs, Building and Improvements	4,321	[6]
Costs Capitalized Subsequent to Acquisition	1,527	[6]
Gross Amount at Which Carried at Close of Period, Land	889	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,848	[1],[6]
Total	6,737	[2],[6]
Accumulated Depreciation	2,707	[3],[6]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1320 Wyckoff Avenue [Member]
Year Built	1986	[6]
Acquired	1995	[6]
Initial Costs, Land	255	[6]
Initial Costs, Building and Improvements	1,285	[6]
Costs Capitalized Subsequent to Acquisition	282	[6]
Gross Amount at Which Carried at Close of Period, Land	216	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,606	[1],[6]
Total	1,822	[2],[6]
Accumulated Depreciation	685	[3],[6]
New Jersey [Member] | Monmouth County [Member] | Wall Township [Member] | 1324 Wyckoff Avenue [Member]
Year Built	1987	[6]
Acquired	1995	[6]
Initial Costs, Land	230	[6]
Initial Costs, Building and Improvements	1,439	[6]
Costs Capitalized Subsequent to Acquisition	269	[6]
Gross Amount at Which Carried at Close of Period, Land	190	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,748	[1],[6]
Total	1,938	[2],[6]
Accumulated Depreciation	828	[3],[6]
New Jersey [Member] | Morris County [Member] | Florham Park [Member] | 325 Columbia Parkway [Member]
Year Built	1987	[4]
Acquired	1994	[4]
Initial Costs, Land	1,564	[4]
Costs Capitalized Subsequent to Acquisition	17,590	[4]
Gross Amount at Which Carried at Close of Period, Land	1,564	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	17,590	[1],[4]
Total	19,154	[2],[4]
Accumulated Depreciation	9,534	[3],[4]
New Jersey [Member] | Morris County [Member] | Morris Plains [Member] | 250 Johnson Road [Member]
Year Built	1977	[4]
Acquired	1997	[4]
Initial Costs, Land	2,004	[4]
Initial Costs, Building and Improvements	8,016	[4]
Costs Capitalized Subsequent to Acquisition	2,117	[4]
Gross Amount at Which Carried at Close of Period, Land	2,004	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,133	[1],[4]
Total	12,137	[2],[4]
Accumulated Depreciation	4,079	[3],[4]
New Jersey [Member] | Morris County [Member] | Morris Plains [Member] | 201 Littleton Road [Member]
Year Built	1979	[4]
Acquired	1997	[4]
Initial Costs, Land	2,407	[4]
Initial Costs, Building and Improvements	9,627	[4]
Costs Capitalized Subsequent to Acquisition	3,497	[4]
Gross Amount at Which Carried at Close of Period, Land	2,407	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	13,124	[1],[4]
Total	15,531	[2],[4]
Accumulated Depreciation	4,147	[3],[4]
New Jersey [Member] | Morris County [Member] | Morris Township [Member] | 412 Mt. Kemble Avenue [Member]
Year Built	1985	[4]
Acquired	2004	[4]
Initial Costs, Land	4,360	[4]
Initial Costs, Building and Improvements	33,167	[4]
Costs Capitalized Subsequent to Acquisition	16,051	[4]
Gross Amount at Which Carried at Close of Period, Land	4,360	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	49,218	[1],[4]
Total	53,578	[2],[4]
Accumulated Depreciation	13,045	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 4 Campus Drive [Member]
Year Built	1983	[4]
Acquired	2001	[4]
Initial Costs, Land	5,213	[4]
Initial Costs, Building and Improvements	20,984	[4]
Costs Capitalized Subsequent to Acquisition	2,825	[4]
Gross Amount at Which Carried at Close of Period, Land	5,213	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,809	[1],[4]
Total	29,022	[2],[4]
Accumulated Depreciation	7,216	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 6 Campus Drive [Member]
Year Built	1983	[4]
Acquired	2001	[4]
Initial Costs, Land	4,411	[4]
Initial Costs, Building and Improvements	17,796	[4]
Costs Capitalized Subsequent to Acquisition	2,944	[4]
Gross Amount at Which Carried at Close of Period, Land	4,411	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	20,740	[1],[4]
Total	25,151	[2],[4]
Accumulated Depreciation	6,765	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 7 Campus Drive [Member]
Year Built	1982	[4]
Acquired	1998	[4]
Initial Costs, Land	1,932	[4]
Initial Costs, Building and Improvements	27,788	[4]
Costs Capitalized Subsequent to Acquisition	6,076	[4]
Gross Amount at Which Carried at Close of Period, Land	1,932	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	33,864	[1],[4]
Total	35,796	[2],[4]
Accumulated Depreciation	12,391	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 8 Campus Drive [Member]
Year Built	1987	[4]
Acquired	1998	[4]
Initial Costs, Land	1,865	[4]
Initial Costs, Building and Improvements	35,456	[4]
Costs Capitalized Subsequent to Acquisition	3,680	[4]
Gross Amount at Which Carried at Close of Period, Land	1,865	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	39,136	[1],[4]
Total	41,001	[2],[4]
Accumulated Depreciation	15,833	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 9 Campus Drive [Member]
Year Built	1983	[4]
Acquired	2001	[4]
Initial Costs, Land	3,277	[4]
Initial Costs, Building and Improvements	11,796	[4]
Costs Capitalized Subsequent to Acquisition	16,326	[4]
Gross Amount at Which Carried at Close of Period, Land	5,842	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	25,557	[1],[4]
Total	31,399	[2],[4]
Accumulated Depreciation	8,523	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 4 Century Drive [Member]
Year Built	1981	[4]
Acquired	2004	[4]
Initial Costs, Land	1,787	[4]
Initial Costs, Building and Improvements	9,575	[4]
Costs Capitalized Subsequent to Acquisition	1,635	[4]
Gross Amount at Which Carried at Close of Period, Land	1,787	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,210	[1],[4]
Total	12,997	[2],[4]
Accumulated Depreciation	2,600	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 5 Century Drive [Member]
Year Built	1981	[4]
Acquired	2004	[4]
Initial Costs, Land	1,762	[4]
Initial Costs, Building and Improvements	9,341	[4]
Costs Capitalized Subsequent to Acquisition	2,281	[4]
Gross Amount at Which Carried at Close of Period, Land	1,762	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,622	[1],[4]
Total	13,384	[2],[4]
Accumulated Depreciation	2,743	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 6 Century Drive [Member]
Year Built	1981	[4]
Acquired	2004	[4]
Initial Costs, Land	1,289	[4]
Initial Costs, Building and Improvements	6,848	[4]
Costs Capitalized Subsequent to Acquisition	2,021	[4]
Gross Amount at Which Carried at Close of Period, Land	1,289	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,869	[1],[4]
Total	10,158	[2],[4]
Accumulated Depreciation	2,099	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 2 Dryden Way [Member]
Year Built	1990	[4]
Acquired	1998	[4]
Initial Costs, Land	778	[4]
Initial Costs, Building and Improvements	420	[4]
Costs Capitalized Subsequent to Acquisition	110	[4]
Gross Amount at Which Carried at Close of Period, Land	778	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	530	[1],[4]
Total	1,308	[2],[4]
Accumulated Depreciation	208	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 4 Gatehall Drive [Member]
Year Built	1988	[4]
Acquired	2000	[4]
Initial Costs, Land	8,452	[4]
Initial Costs, Building and Improvements	33,929	[4]
Costs Capitalized Subsequent to Acquisition	4,340	[4]
Gross Amount at Which Carried at Close of Period, Land	8,452	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	38,269	[1],[4]
Total	46,721	[2],[4]
Accumulated Depreciation	12,909	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 2 Hilton Court [Member]
Year Built	1991	[4]
Acquired	1998	[4]
Initial Costs, Land	1,971	[4]
Initial Costs, Building and Improvements	32,007	[4]
Costs Capitalized Subsequent to Acquisition	5,550	[4]
Gross Amount at Which Carried at Close of Period, Land	1,971	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	37,557	[1],[4]
Total	39,528	[2],[4]
Accumulated Depreciation	14,355	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 1633 Littleton Road [Member]
Year Built	1978	[4]
Acquired	2002	[4]
Initial Costs, Land	2,283	[4]
Initial Costs, Building and Improvements	9,550	[4]
Costs Capitalized Subsequent to Acquisition	163	[4]
Gross Amount at Which Carried at Close of Period, Land	2,355	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,641	[1],[4]
Total	11,996	[2],[4]
Accumulated Depreciation	3,580	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 600 Parsippany Road [Member]
Year Built	1978	[4]
Acquired	1994	[4]
Initial Costs, Land	1,257	[4]
Initial Costs, Building and Improvements	5,594	[4]
Costs Capitalized Subsequent to Acquisition	3,351	[4]
Gross Amount at Which Carried at Close of Period, Land	1,257	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,945	[1],[4]
Total	10,202	[2],[4]
Accumulated Depreciation	3,948	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 1 Sylvan Way [Member]
Year Built	1989	[4]
Acquired	1998	[4]
Initial Costs, Land	1,689	[4]
Initial Costs, Building and Improvements	24,699	[4]
Costs Capitalized Subsequent to Acquisition	2,723	[4]
Gross Amount at Which Carried at Close of Period, Land	1,021	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	28,090	[1],[4]
Total	29,111	[2],[4]
Accumulated Depreciation	10,043	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 4 Sylvan Way [Member]
Year Built	1983	[4]
Acquired	2009	[4]
Related Encumbrances	14,485	[4]
Initial Costs, Land	2,400	[4]
Initial Costs, Building and Improvements	13,486	[4]
Gross Amount at Which Carried at Close of Period, Land	2,400	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	13,486	[1],[4]
Total	15,886	[2],[4]
Accumulated Depreciation	1,868	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 5 Sylvan Way [Member]
Year Built	1989	[4]
Acquired	1998	[4]
Initial Costs, Land	1,160	[4]
Initial Costs, Building and Improvements	25,214	[4]
Costs Capitalized Subsequent to Acquisition	2,132	[4]
Gross Amount at Which Carried at Close of Period, Land	1,161	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	27,345	[1],[4]
Total	28,506	[2],[4]
Accumulated Depreciation	10,321	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 7 Sylvan Way [Member]
Year Built	1987	[4]
Acquired	1998	[4]
Initial Costs, Land	2,084	[4]
Initial Costs, Building and Improvements	26,083	[4]
Costs Capitalized Subsequent to Acquisition	35	[4]
Gross Amount at Which Carried at Close of Period, Land	2,084	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	26,118	[1],[4]
Total	28,202	[2],[4]
Accumulated Depreciation	9,758	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 22 Sylvan Way [Member]
Year Built	2009	[4]
Acquired	2009	[4]
Initial Costs, Land	14,600	[4]
Initial Costs, Building and Improvements	44,392	[4]
Costs Capitalized Subsequent to Acquisition	81	[4]
Gross Amount at Which Carried at Close of Period, Land	14,600	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	44,473	[1],[4]
Total	59,073	[2],[4]
Accumulated Depreciation	6,035	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 20 Waterview Boulevard [Member]
Year Built	1988	[4]
Acquired	2009	[4]
Related Encumbrances	23,954	[4]
Initial Costs, Land	4,500	[4]
Initial Costs, Building and Improvements	27,246	[4]
Costs Capitalized Subsequent to Acquisition	862	[4]
Gross Amount at Which Carried at Close of Period, Land	4,500	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	28,108	[1],[4]
Total	32,608	[2],[4]
Accumulated Depreciation	3,358	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 35 Waterview Boulevard [Member]
Year Built	1990	[4]
Acquired	2006	[4]
Related Encumbrances	18,746	[4]
Initial Costs, Land	5,133	[4]
Initial Costs, Building and Improvements	28,059	[4]
Costs Capitalized Subsequent to Acquisition	770	[4]
Gross Amount at Which Carried at Close of Period, Land	5,133	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	28,829	[1],[4]
Total	33,962	[2],[4]
Accumulated Depreciation	5,794	[3],[4]
New Jersey [Member] | Morris County [Member] | Parsippany [Member] | 5 Wood Hollow Road [Member]
Year Built	1979	[4]
Acquired	2004	[4]
Initial Costs, Land	5,302	[4]
Initial Costs, Building and Improvements	26,488	[4]
Costs Capitalized Subsequent to Acquisition	15,277	[4]
Gross Amount at Which Carried at Close of Period, Land	5,302	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	41,765	[1],[4]
Total	47,067	[2],[4]
Accumulated Depreciation	11,925	[3],[4]
New Jersey [Member] | Passaic County [Member] | Clifton [Member] | 777 Passaic Avenue [Member]
Year Built	1983	[4]
Acquired	1994	[4]
Costs Capitalized Subsequent to Acquisition	7,346	[4]
Gross Amount at Which Carried at Close of Period, Land	1,100	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,246	[1],[4]
Total	7,346	[2],[4]
Accumulated Depreciation	3,740	[3],[4]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 1 Center Court [Member]
Year Built	1999	[6]
Acquired	1999	[6]
Initial Costs, Land	270	[6]
Initial Costs, Building and Improvements	1,824	[6]
Costs Capitalized Subsequent to Acquisition	490	[6]
Gross Amount at Which Carried at Close of Period, Land	270	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,314	[1],[6]
Total	2,584	[2],[6]
Accumulated Depreciation	712	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 2 Center Court [Member]
Year Built	1998	[6]
Acquired	1998	[6]
Initial Costs, Land	191	[6]
Costs Capitalized Subsequent to Acquisition	2,247	[6]
Gross Amount at Which Carried at Close of Period, Land	191	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,247	[1],[6]
Total	2,438	[2],[6]
Accumulated Depreciation	903	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 11 Commerce Way [Member]
Year Built	1989	[6]
Acquired	1995	[6]
Initial Costs, Land	586	[6]
Initial Costs, Building and Improvements	2,986	[6]
Costs Capitalized Subsequent to Acquisition	889	[6]
Gross Amount at Which Carried at Close of Period, Land	586	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,875	[1],[6]
Total	4,461	[2],[6]
Accumulated Depreciation	1,490	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 20 Commerce Way [Member]
Year Built	1992	[6]
Acquired	1995	[6]
Initial Costs, Land	516	[6]
Initial Costs, Building and Improvements	3,108	[6]
Costs Capitalized Subsequent to Acquisition	63	[6]
Gross Amount at Which Carried at Close of Period, Land	516	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,171	[1],[6]
Total	3,687	[2],[6]
Accumulated Depreciation	1,346	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 29 Commerce Way [Member]
Year Built	1990	[6]
Acquired	1995	[6]
Initial Costs, Land	586	[6]
Initial Costs, Building and Improvements	3,092	[6]
Costs Capitalized Subsequent to Acquisition	1,039	[6]
Gross Amount at Which Carried at Close of Period, Land	586	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,131	[1],[6]
Total	4,717	[2],[6]
Accumulated Depreciation	1,905	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 40 Commerce Way [Member]
Year Built	1987	[6]
Acquired	1995	[6]
Initial Costs, Land	516	[6]
Initial Costs, Building and Improvements	3,260	[6]
Costs Capitalized Subsequent to Acquisition	1,306	[6]
Gross Amount at Which Carried at Close of Period, Land	516	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,566	[1],[6]
Total	5,082	[2],[6]
Accumulated Depreciation	1,666	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 45 Commerce Way [Member]
Year Built	1992	[6]
Acquired	1995	[6]
Initial Costs, Land	536	[6]
Initial Costs, Building and Improvements	3,379	[6]
Costs Capitalized Subsequent to Acquisition	555	[6]
Gross Amount at Which Carried at Close of Period, Land	536	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,934	[1],[6]
Total	4,470	[2],[6]
Accumulated Depreciation	1,700	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 60 Commerce Way [Member]
Year Built	1988	[6]
Acquired	1995	[6]
Initial Costs, Land	526	[6]
Initial Costs, Building and Improvements	3,257	[6]
Costs Capitalized Subsequent to Acquisition	716	[6]
Gross Amount at Which Carried at Close of Period, Land	526	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,973	[1],[6]
Total	4,499	[2],[6]
Accumulated Depreciation	1,836	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 80 Commerce Way [Member]
Year Built	1996	[6]
Acquired	1996	[6]
Initial Costs, Land	227	[6]
Costs Capitalized Subsequent to Acquisition	1,325	[6]
Gross Amount at Which Carried at Close of Period, Land	227	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,325	[1],[6]
Total	1,552	[2],[6]
Accumulated Depreciation	517	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 100 Commerce Way [Member]
Year Built	1996	[6]
Acquired	1996	[6]
Initial Costs, Land	226	[6]
Costs Capitalized Subsequent to Acquisition	1,325	[6]
Gross Amount at Which Carried at Close of Period, Land	226	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,325	[1],[6]
Total	1,551	[2],[6]
Accumulated Depreciation	516	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 120 Commerce Way [Member]
Year Built	1994	[6]
Acquired	1995	[6]
Initial Costs, Land	228	[6]
Costs Capitalized Subsequent to Acquisition	1,341	[6]
Gross Amount at Which Carried at Close of Period, Land	229	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,340	[1],[6]
Total	1,568	[2],[6]
Accumulated Depreciation	591	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 140 Commerce Way [Member]
Year Built	1994	[6]
Acquired	1995	[6]
Initial Costs, Land	229	[6]
Costs Capitalized Subsequent to Acquisition	1,339	[6]
Gross Amount at Which Carried at Close of Period, Land	228	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,339	[1],[6]
Total	1,568	[2],[6]
Accumulated Depreciation	591	[3],[6]
New Jersey [Member] | Passaic County [Member] | Totowa [Member] | 999 Riverview Drive [Member]
Year Built	1988	[4]
Acquired	1995	[4]
Initial Costs, Land	476	[4]
Initial Costs, Building and Improvements	6,024	[4]
Costs Capitalized Subsequent to Acquisition	2,191	[4]
Gross Amount at Which Carried at Close of Period, Land	1,102	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,589	[1],[4]
Total	8,691	[2],[4]
Accumulated Depreciation	3,334	[3],[4]
New Jersey [Member] | Somerset County [Member] | Basking Ridge [Member] | 222 Mt. Airy Road [Member]
Year Built	1986	[4]
Acquired	1996	[4]
Initial Costs, Land	775	[4]
Initial Costs, Building and Improvements	3,636	[4]
Costs Capitalized Subsequent to Acquisition	3,068	[4]
Gross Amount at Which Carried at Close of Period, Land	775	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,704	[1],[4]
Total	7,479	[2],[4]
Accumulated Depreciation	3,040	[3],[4]
New Jersey [Member] | Somerset County [Member] | Basking Ridge [Member] | 233 Mt. Airy Road [Member]
Year Built	1987	[4]
Acquired	1996	[4]
Initial Costs, Land	1,034	[4]
Initial Costs, Building and Improvements	5,033	[4]
Costs Capitalized Subsequent to Acquisition	694	[4]
Gross Amount at Which Carried at Close of Period, Land	1,034	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,727	[1],[4]
Total	6,761	[2],[4]
Accumulated Depreciation	2,250	[3],[4]
New Jersey [Member] | Somerset County [Member] | Bernards [Member] | 106 Allen Road [Member]
Year Built	2000	[4]
Acquired	2000	[4]
Initial Costs, Land	3,853	[4]
Initial Costs, Building and Improvements	14,465	[4]
Costs Capitalized Subsequent to Acquisition	4,306	[4]
Gross Amount at Which Carried at Close of Period, Land	4,093	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,531	[1],[4]
Total	22,624	[2],[4]
Accumulated Depreciation	8,000	[3],[4]
New Jersey [Member] | Somerset County [Member] | Branchburg [Member] | 51 Imclone Drive [Member]
Year Built	1978	[4]
Acquired	2009	[4]
Related Encumbrances	3,878	[4]
Initial Costs, Land	1,900	[4]
Initial Costs, Building and Improvements	3,475	[4]
Costs Capitalized Subsequent to Acquisition	(1)	[4]
Gross Amount at Which Carried at Close of Period, Land	1,900	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,474	[1],[4]
Total	5,374	[2],[4]
Accumulated Depreciation	398	[3],[4]
New Jersey [Member] | Somerset County [Member] | Bridgewater [Member] | 440 Route 22 East [Member]
Year Built	1990	[4]
Acquired	2010	[4]
Initial Costs, Land	3,986	[4]
Initial Costs, Building and Improvements	13,658	[4]
Costs Capitalized Subsequent to Acquisition	4,568	[4]
Gross Amount at Which Carried at Close of Period, Land	3,986	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,226	[1],[4]
Total	22,212	[2],[4]
Accumulated Depreciation	1,764	[3],[4]
New Jersey [Member] | Somerset County [Member] | Bridgewater [Member] | 721 Route 202/206 [Member]
Year Built	1989	[4]
Acquired	1997	[4]
Initial Costs, Land	6,730	[4]
Initial Costs, Building and Improvements	26,919	[4]
Costs Capitalized Subsequent to Acquisition	9,434	[4]
Gross Amount at Which Carried at Close of Period, Land	6,730	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	36,353	[1],[4]
Total	43,083	[2],[4]
Accumulated Depreciation	15,049	[3],[4]
New Jersey [Member] | Somerset County [Member] | Warren [Member] | 10 Independence Boulevard [Member]
Year Built	1988	[4]
Acquired	2009	[4]
Related Encumbrances	16,250	[4]
Initial Costs, Land	2,300	[4]
Initial Costs, Building and Improvements	15,499	[4]
Costs Capitalized Subsequent to Acquisition	(209)	[4]
Gross Amount at Which Carried at Close of Period, Land	2,300	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,290	[1],[4]
Total	17,590	[2],[4]
Accumulated Depreciation	1,403	[3],[4]
New Jersey [Member] | Union County [Member] | Clark [Member] | 100 Walnut Avenue [Member]
Year Built	1985	[4]
Acquired	1994	[4]
Related Encumbrances	19,025	[4]
Costs Capitalized Subsequent to Acquisition	17,363	[4]
Gross Amount at Which Carried at Close of Period, Land	1,822	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,541	[1],[4]
Total	17,363	[2],[4]
Accumulated Depreciation	9,906	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 6 Commerce Drive [Member]
Year Built	1973	[4]
Acquired	1994	[4]
Initial Costs, Land	250	[4]
Costs Capitalized Subsequent to Acquisition	2,938	[4]
Gross Amount at Which Carried at Close of Period, Land	250	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,938	[1],[4]
Total	3,188	[2],[4]
Accumulated Depreciation	2,148	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 11 Commerce Drive [Member]
Year Built	1981	[4]
Acquired	1994	[4]
Initial Costs, Land	470	[4]
Costs Capitalized Subsequent to Acquisition	5,613	[4]
Gross Amount at Which Carried at Close of Period, Land	470	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,613	[1],[4]
Total	6,083	[2],[4]
Accumulated Depreciation	4,524	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 12 Commerce Drive [Member]
Year Built	1967	[4]
Acquired	1997	[4]
Initial Costs, Land	887	[4]
Initial Costs, Building and Improvements	3,549	[4]
Costs Capitalized Subsequent to Acquisition	1,533	[4]
Gross Amount at Which Carried at Close of Period, Land	887	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,082	[1],[4]
Total	5,969	[2],[4]
Accumulated Depreciation	1,928	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 14 Commerce Drive [Member]
Year Built	1971	[4]
Acquired	2003	[4]
Initial Costs, Land	1,283	[4]
Initial Costs, Building and Improvements	6,344	[4]
Costs Capitalized Subsequent to Acquisition	1,544	[4]
Gross Amount at Which Carried at Close of Period, Land	1,283	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,888	[1],[4]
Total	9,171	[2],[4]
Accumulated Depreciation	2,217	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 20 Commerce Drive [Member]
Year Built	1990	[4]
Acquired	1994	[4]
Initial Costs, Land	2,346	[4]
Costs Capitalized Subsequent to Acquisition	19,761	[4]
Gross Amount at Which Carried at Close of Period, Land	2,346	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	19,761	[1],[4]
Total	22,107	[2],[4]
Accumulated Depreciation	10,333	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 25 Commerce Drive [Member]
Year Built	1971	[4]
Acquired	2002	[4]
Initial Costs, Land	1,520	[4]
Initial Costs, Building and Improvements	6,186	[4]
Costs Capitalized Subsequent to Acquisition	848	[4]
Gross Amount at Which Carried at Close of Period, Land	1,520	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,034	[1],[4]
Total	8,554	[2],[4]
Accumulated Depreciation	2,722	[3],[4]
New Jersey [Member] | Union County [Member] | Cranford [Member] | 65 Jackson Drive [Member]
Year Built	1984	[4]
Acquired	1994	[4]
Initial Costs, Land	541	[4]
Costs Capitalized Subsequent to Acquisition	6,218	[4]
Gross Amount at Which Carried at Close of Period, Land	542	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,217	[1],[4]
Total	6,759	[2],[4]
Accumulated Depreciation	3,852	[3],[4]
New Jersey [Member] | Union County [Member] | New Providence [Member] | 890 Mountain Road [Member]
Year Built	1977	[4]
Acquired	1997	[4]
Initial Costs, Land	2,796	[4]
Initial Costs, Building and Improvements	11,185	[4]
Costs Capitalized Subsequent to Acquisition	5,887	[4]
Gross Amount at Which Carried at Close of Period, Land	3,765	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	16,103	[1],[4]
Total	19,868	[2],[4]
Accumulated Depreciation	5,824	[3],[4]
New York [Member] | New York County [Member] | New York [Member] | 125 Broad Street [Member]
Year Built	1970	[4]
Acquired	2007	[4]
Initial Costs, Land	50,191	[4]
Initial Costs, Building and Improvements	207,002	[4]
Costs Capitalized Subsequent to Acquisition	30,193	[4]
Gross Amount at Which Carried at Close of Period, Land	50,191	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	237,195	[1],[4]
Total	287,386	[2],[4]
Accumulated Depreciation	33,139	[3],[4]
New York [Member] | Rockland County [Member] | Suffern [Member] | 400 Rella Boulevard [Member]
Year Built	1988	[4]
Acquired	1995	[4]
Initial Costs, Land	1,090	[4]
Initial Costs, Building and Improvements	13,412	[4]
Costs Capitalized Subsequent to Acquisition	3,054	[4]
Gross Amount at Which Carried at Close of Period, Land	1,090	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	16,466	[1],[4]
Total	17,556	[2],[4]
Accumulated Depreciation	7,840	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 11 Clearbrook Road [Member]
Year Built	1974	[6]
Acquired	1997	[6]
Initial Costs, Land	149	[6]
Initial Costs, Building and Improvements	2,159	[6]
Costs Capitalized Subsequent to Acquisition	491	[6]
Gross Amount at Which Carried at Close of Period, Land	149	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,650	[1],[6]
Total	2,799	[2],[6]
Accumulated Depreciation	1,101	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 75 Clearbrook Road [Member]
Year Built	1990	[6]
Acquired	1997	[6]
Initial Costs, Land	2,314	[6]
Initial Costs, Building and Improvements	4,716	[6]
Costs Capitalized Subsequent to Acquisition	107	[6]
Gross Amount at Which Carried at Close of Period, Land	2,314	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,823	[1],[6]
Total	7,137	[2],[6]
Accumulated Depreciation	1,946	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 100 Clearbrook Road [Member]
Year Built	1975	[4]
Acquired	1997	[4]
Initial Costs, Land	220	[4]
Initial Costs, Building and Improvements	5,366	[4]
Costs Capitalized Subsequent to Acquisition	1,192	[4]
Gross Amount at Which Carried at Close of Period, Land	220	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,558	[1],[4]
Total	6,778	[2],[4]
Accumulated Depreciation	2,608	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 125 Clearbrook Road [Member]
Year Built	2002	[6]
Acquired	2002	[6]
Initial Costs, Land	1,055	[6]
Initial Costs, Building and Improvements	3,676	[6]
Costs Capitalized Subsequent to Acquisition	(51)	[6]
Gross Amount at Which Carried at Close of Period, Land	1,055	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,625	[1],[6]
Total	4,680	[2],[6]
Accumulated Depreciation	1,669	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 150 Clearbrook Road [Member]
Year Built	1975	[6]
Acquired	1997	[6]
Initial Costs, Land	497	[6]
Initial Costs, Building and Improvements	7,030	[6]
Costs Capitalized Subsequent to Acquisition	2,211	[6]
Gross Amount at Which Carried at Close of Period, Land	497	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,241	[1],[6]
Total	9,738	[2],[6]
Accumulated Depreciation	3,461	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 175 Clearbrook Road [Member]
Year Built	1973	[6]
Acquired	1997	[6]
Initial Costs, Land	655	[6]
Initial Costs, Building and Improvements	7,473	[6]
Costs Capitalized Subsequent to Acquisition	901	[6]
Gross Amount at Which Carried at Close of Period, Land	655	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,374	[1],[6]
Total	9,029	[2],[6]
Accumulated Depreciation	3,528	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 200 Clearbrook Road [Member]
Year Built	1974	[6]
Acquired	1997	[6]
Initial Costs, Land	579	[6]
Initial Costs, Building and Improvements	6,620	[6]
Costs Capitalized Subsequent to Acquisition	1,828	[6]
Gross Amount at Which Carried at Close of Period, Land	579	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,448	[1],[6]
Total	9,027	[2],[6]
Accumulated Depreciation	3,512	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 250 Clearbrook Road [Member]
Year Built	1973	[6]
Acquired	1997	[6]
Initial Costs, Land	867	[6]
Initial Costs, Building and Improvements	8,647	[6]
Costs Capitalized Subsequent to Acquisition	1,153	[6]
Gross Amount at Which Carried at Close of Period, Land	867	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,800	[1],[6]
Total	10,667	[2],[6]
Accumulated Depreciation	3,762	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 50 Executive Boulevard [Member]
Year Built	1969	[6]
Acquired	1997	[6]
Initial Costs, Land	237	[6]
Initial Costs, Building and Improvements	2,617	[6]
Costs Capitalized Subsequent to Acquisition	234	[6]
Gross Amount at Which Carried at Close of Period, Land	237	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,851	[1],[6]
Total	3,088	[2],[6]
Accumulated Depreciation	1,122	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 77 Executive Boulevard [Member]
Year Built	1977	[6]
Acquired	1997	[6]
Initial Costs, Land	34	[6]
Initial Costs, Building and Improvements	1,104	[6]
Costs Capitalized Subsequent to Acquisition	212	[6]
Gross Amount at Which Carried at Close of Period, Land	34	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,316	[1],[6]
Total	1,350	[2],[6]
Accumulated Depreciation	517	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 85 Executive Boulevard [Member]
Year Built	1968	[6]
Acquired	1997	[6]
Initial Costs, Land	155	[6]
Initial Costs, Building and Improvements	2,507	[6]
Costs Capitalized Subsequent to Acquisition	566	[6]
Gross Amount at Which Carried at Close of Period, Land	155	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,073	[1],[6]
Total	3,228	[2],[6]
Accumulated Depreciation	1,419	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 101 Executive Boulevard [Member]
Year Built	1971	[4]
Acquired	1997	[4]
Initial Costs, Land	267	[4]
Initial Costs, Building and Improvements	5,838	[4]
Costs Capitalized Subsequent to Acquisition	696	[4]
Gross Amount at Which Carried at Close of Period, Land	267	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,534	[1],[4]
Total	6,801	[2],[4]
Accumulated Depreciation	2,654	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 300 Executive Boulevard [Member]
Year Built	1970	[6]
Acquired	1997	[6]
Initial Costs, Land	460	[6]
Initial Costs, Building and Improvements	3,609	[6]
Costs Capitalized Subsequent to Acquisition	267	[6]
Gross Amount at Which Carried at Close of Period, Land	460	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,876	[1],[6]
Total	4,336	[2],[6]
Accumulated Depreciation	1,605	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 350 Executive Boulevard [Member]
Year Built	1970	[6]
Acquired	1997	[6]
Initial Costs, Land	100	[6]
Initial Costs, Building and Improvements	1,793	[6]
Costs Capitalized Subsequent to Acquisition	171	[6]
Gross Amount at Which Carried at Close of Period, Land	100	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,964	[1],[6]
Total	2,064	[2],[6]
Accumulated Depreciation	728	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 399 Executive Boulevard [Member]
Year Built	1962	[6]
Acquired	1997	[6]
Initial Costs, Land	531	[6]
Initial Costs, Building and Improvements	7,191	[6]
Costs Capitalized Subsequent to Acquisition	163	[6]
Gross Amount at Which Carried at Close of Period, Land	531	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,354	[1],[6]
Total	7,885	[2],[6]
Accumulated Depreciation	2,926	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 400 Executive Boulevard [Member]
Year Built	1970	[6]
Acquired	1997	[6]
Initial Costs, Land	2,202	[6]
Initial Costs, Building and Improvements	1,846	[6]
Costs Capitalized Subsequent to Acquisition	791	[6]
Gross Amount at Which Carried at Close of Period, Land	2,202	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,637	[1],[6]
Total	4,839	[2],[6]
Accumulated Depreciation	1,011	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 500 Executive Boulevard [Member]
Year Built	1970	[6]
Acquired	1997	[6]
Initial Costs, Land	258	[6]
Initial Costs, Building and Improvements	4,183	[6]
Costs Capitalized Subsequent to Acquisition	427	[6]
Gross Amount at Which Carried at Close of Period, Land	258	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,610	[1],[6]
Total	4,868	[2],[6]
Accumulated Depreciation	1,833	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 525 Executive Boulevard [Member]
Year Built	1972	[6]
Acquired	1997	[6]
Initial Costs, Land	345	[6]
Initial Costs, Building and Improvements	5,499	[6]
Costs Capitalized Subsequent to Acquisition	889	[6]
Gross Amount at Which Carried at Close of Period, Land	345	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,388	[1],[6]
Total	6,733	[2],[6]
Accumulated Depreciation	2,566	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 700 Executive Boulevard [Member]
Acquired	1997	[7]
Initial Costs, Land	970	[7]
Gross Amount at Which Carried at Close of Period, Land	970	[1],[7]
Total	970	[2],[7]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 555 Taxter Road [Member]
Year Built	1986	[4]
Acquired	2000	[4]
Initial Costs, Land	4,285	[4]
Initial Costs, Building and Improvements	17,205	[4]
Costs Capitalized Subsequent to Acquisition	5,316	[4]
Gross Amount at Which Carried at Close of Period, Land	4,285	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	22,521	[1],[4]
Total	26,806	[2],[4]
Accumulated Depreciation	9,079	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 565 Taxter Road [Member]
Year Built	1988	[4]
Acquired	2000	[4]
Initial Costs, Land	4,285	[4]
Initial Costs, Building and Improvements	17,205	[4]
Costs Capitalized Subsequent to Acquisition	3,293	[4]
Gross Amount at Which Carried at Close of Period, Land	4,233	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	20,550	[1],[4]
Total	24,783	[2],[4]
Accumulated Depreciation	6,552	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 570 Taxter Road [Member]
Year Built	1972	[4]
Acquired	1997	[4]
Initial Costs, Land	438	[4]
Initial Costs, Building and Improvements	6,078	[4]
Costs Capitalized Subsequent to Acquisition	1,460	[4]
Gross Amount at Which Carried at Close of Period, Land	438	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,538	[1],[4]
Total	7,976	[2],[4]
Accumulated Depreciation	2,869	[3],[4]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 1 Warehouse Lane [Member]
Year Built	1957	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	3	[5],[8]
Initial Costs, Building and Improvements	268	[5],[8]
Costs Capitalized Subsequent to Acquisition	265	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	3	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	533	[1],[5],[8]
Total	536	[2],[5],[8]
Accumulated Depreciation	221	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 2 Warehouse Lane [Member]
Year Built	1957	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	4	[5],[8]
Initial Costs, Building and Improvements	672	[5],[8]
Costs Capitalized Subsequent to Acquisition	113	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	4	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	785	[1],[5],[8]
Total	789	[2],[5],[8]
Accumulated Depreciation	336	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 3 Warehouse Lane [Member]
Year Built	1957	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	21	[5],[8]
Initial Costs, Building and Improvements	1,948	[5],[8]
Costs Capitalized Subsequent to Acquisition	526	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	21	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,474	[1],[5],[8]
Total	2,495	[2],[5],[8]
Accumulated Depreciation	1,143	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 4 Warehouse Lane [Member]
Year Built	1957	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	84	[5],[8]
Initial Costs, Building and Improvements	13,393	[5],[8]
Costs Capitalized Subsequent to Acquisition	3,660	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	85	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	17,052	[1],[5],[8]
Total	17,137	[2],[5],[8]
Accumulated Depreciation	7,065	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 5 Warehouse Lane [Member]
Year Built	1957	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	19	[5],[8]
Initial Costs, Building and Improvements	4,804	[5],[8]
Costs Capitalized Subsequent to Acquisition	1,490	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	19	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,294	[1],[5],[8]
Total	6,313	[2],[5],[8]
Accumulated Depreciation	2,814	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 6 Warehouse Lane [Member]
Year Built	1982	[5],[8]
Acquired	1997	[5],[8]
Initial Costs, Land	10	[5],[8]
Initial Costs, Building and Improvements	4,419	[5],[8]
Costs Capitalized Subsequent to Acquisition	2,203	[5],[8]
Gross Amount at Which Carried at Close of Period, Land	10	[1],[5],[8]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,622	[1],[5],[8]
Total	6,632	[2],[5],[8]
Accumulated Depreciation	2,117	[3],[5],[8]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 1 Westchester Plaza [Member]
Year Built	1967	[6]
Acquired	1997	[6]
Initial Costs, Land	199	[6]
Initial Costs, Building and Improvements	2,023	[6]
Costs Capitalized Subsequent to Acquisition	425	[6]
Gross Amount at Which Carried at Close of Period, Land	199	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,448	[1],[6]
Total	2,647	[2],[6]
Accumulated Depreciation	956	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 2 Westchester Plaza [Member]
Year Built	1968	[6]
Acquired	1997	[6]
Initial Costs, Land	234	[6]
Initial Costs, Building and Improvements	2,726	[6]
Costs Capitalized Subsequent to Acquisition	205	[6]
Gross Amount at Which Carried at Close of Period, Land	234	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,931	[1],[6]
Total	3,165	[2],[6]
Accumulated Depreciation	1,198	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 3 Westchester Plaza [Member]
Year Built	1969	[6]
Acquired	1997	[6]
Initial Costs, Land	655	[6]
Initial Costs, Building and Improvements	7,936	[6]
Costs Capitalized Subsequent to Acquisition	1,023	[6]
Gross Amount at Which Carried at Close of Period, Land	655	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,959	[1],[6]
Total	9,614	[2],[6]
Accumulated Depreciation	3,577	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 4 Westchester Plaza [Member]
Year Built	1969	[6]
Acquired	1997	[6]
Initial Costs, Land	320	[6]
Initial Costs, Building and Improvements	3,729	[6]
Costs Capitalized Subsequent to Acquisition	994	[6]
Gross Amount at Which Carried at Close of Period, Land	320	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,723	[1],[6]
Total	5,043	[2],[6]
Accumulated Depreciation	1,810	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 5 Westchester Plaza [Member]
Year Built	1969	[6]
Acquired	1997	[6]
Initial Costs, Land	118	[6]
Initial Costs, Building and Improvements	1,949	[6]
Costs Capitalized Subsequent to Acquisition	513	[6]
Gross Amount at Which Carried at Close of Period, Land	118	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,462	[1],[6]
Total	2,580	[2],[6]
Accumulated Depreciation	1,075	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 6 Westchester Plaza [Member]
Year Built	1968	[6]
Acquired	1997	[6]
Initial Costs, Land	164	[6]
Initial Costs, Building and Improvements	1,998	[6]
Costs Capitalized Subsequent to Acquisition	105	[6]
Gross Amount at Which Carried at Close of Period, Land	164	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,103	[1],[6]
Total	2,267	[2],[6]
Accumulated Depreciation	829	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 7 Westchester Plaza [Member]
Year Built	1972	[6]
Acquired	1997	[6]
Initial Costs, Land	286	[6]
Initial Costs, Building and Improvements	4,321	[6]
Costs Capitalized Subsequent to Acquisition	232	[6]
Gross Amount at Which Carried at Close of Period, Land	286	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,553	[1],[6]
Total	4,839	[2],[6]
Accumulated Depreciation	1,801	[3],[6]
New York [Member] | Westchester County [Member] | Elmsford [Member] | 8 Westchester Plaza [Member]
Year Built	1971	[6]
Acquired	1997	[6]
Initial Costs, Land	447	[6]
Initial Costs, Building and Improvements	5,262	[6]
Costs Capitalized Subsequent to Acquisition	2,190	[6]
Gross Amount at Which Carried at Close of Period, Land	447	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,452	[1],[6]
Total	7,899	[2],[6]
Accumulated Depreciation	2,734	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 200 Saw Mill River Road [Member]
Year Built	1965	[6]
Acquired	1997	[6]
Initial Costs, Land	353	[6]
Initial Costs, Building and Improvements	3,353	[6]
Costs Capitalized Subsequent to Acquisition	502	[6]
Gross Amount at Which Carried at Close of Period, Land	353	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,855	[1],[6]
Total	4,208	[2],[6]
Accumulated Depreciation	1,519	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 1 Skyline Drive [Member]
Year Built	1980	[4]
Acquired	1997	[4]
Initial Costs, Land	66	[4]
Initial Costs, Building and Improvements	1,711	[4]
Costs Capitalized Subsequent to Acquisition	301	[4]
Gross Amount at Which Carried at Close of Period, Land	66	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,012	[1],[4]
Total	2,078	[2],[4]
Accumulated Depreciation	875	[3],[4]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 2 Skyline Drive [Member]
Year Built	1987	[4]
Acquired	1997	[4]
Initial Costs, Land	109	[4]
Initial Costs, Building and Improvements	3,128	[4]
Costs Capitalized Subsequent to Acquisition	1,502	[4]
Gross Amount at Which Carried at Close of Period, Land	109	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,630	[1],[4]
Total	4,739	[2],[4]
Accumulated Depreciation	1,660	[3],[4]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 4 Skyline Drive [Member]
Year Built	1987	[6]
Acquired	1997	[6]
Initial Costs, Land	363	[6]
Initial Costs, Building and Improvements	7,513	[6]
Costs Capitalized Subsequent to Acquisition	2,995	[6]
Gross Amount at Which Carried at Close of Period, Land	363	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,508	[1],[6]
Total	10,871	[2],[6]
Accumulated Depreciation	4,272	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 5 Skyline Drive [Member]
Year Built	1980	[6]
Acquired	2001	[6]
Initial Costs, Land	2,219	[6]
Initial Costs, Building and Improvements	8,916	[6]
Costs Capitalized Subsequent to Acquisition	1,488	[6]
Gross Amount at Which Carried at Close of Period, Land	2,219	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,404	[1],[6]
Total	12,623	[2],[6]
Accumulated Depreciation	3,956	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 6 Skyline Drive [Member]
Year Built	1980	[6]
Acquired	2001	[6]
Initial Costs, Land	740	[6]
Initial Costs, Building and Improvements	2,971	[6]
Costs Capitalized Subsequent to Acquisition	1,044	[6]
Gross Amount at Which Carried at Close of Period, Land	740	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,015	[1],[6]
Total	4,755	[2],[6]
Accumulated Depreciation	1,672	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 7 Skyline Drive [Member]
Year Built	1987	[4]
Acquired	1998	[4]
Initial Costs, Land	330	[4]
Initial Costs, Building and Improvements	13,013	[4]
Costs Capitalized Subsequent to Acquisition	2,535	[4]
Gross Amount at Which Carried at Close of Period, Land	330	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,548	[1],[4]
Total	15,878	[2],[4]
Accumulated Depreciation	5,813	[3],[4]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 8 Skyline Drive [Member]
Year Built	1985	[6]
Acquired	1997	[6]
Initial Costs, Land	212	[6]
Initial Costs, Building and Improvements	4,410	[6]
Costs Capitalized Subsequent to Acquisition	878	[6]
Gross Amount at Which Carried at Close of Period, Land	212	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,288	[1],[6]
Total	5,500	[2],[6]
Accumulated Depreciation	2,178	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 10 Skyline Drive [Member]
Year Built	1985	[6]
Acquired	1997	[6]
Initial Costs, Land	134	[6]
Initial Costs, Building and Improvements	2,799	[6]
Costs Capitalized Subsequent to Acquisition	732	[6]
Gross Amount at Which Carried at Close of Period, Land	134	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,531	[1],[6]
Total	3,665	[2],[6]
Accumulated Depreciation	1,480	[3],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 11 Skyline Drive [Member]
Year Built	1989	[5],[6]
Acquired	1997	[5],[6]
Initial Costs, Building and Improvements	4,788	[5],[6]
Costs Capitalized Subsequent to Acquisition	389	[5],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,177	[1],[5],[6]
Total	5,177	[2],[5],[6]
Accumulated Depreciation	1,946	[3],[5],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 12 Skyline Drive [Member]
Year Built	1999	[5],[6]
Acquired	1999	[5],[6]
Initial Costs, Land	1,562	[5],[6]
Initial Costs, Building and Improvements	3,254	[5],[6]
Costs Capitalized Subsequent to Acquisition	222	[5],[6]
Gross Amount at Which Carried at Close of Period, Land	1,320	[1],[5],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,718	[1],[5],[6]
Total	5,038	[2],[5],[6]
Accumulated Depreciation	1,396	[3],[5],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 15 Skyline Drive [Member]
Year Built	1989	[5],[6]
Acquired	1997	[5],[6]
Initial Costs, Building and Improvements	7,449	[5],[6]
Costs Capitalized Subsequent to Acquisition	546	[5],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,995	[1],[5],[6]
Total	7,995	[2],[5],[6]
Accumulated Depreciation	3,311	[3],[5],[6]
New York [Member] | Westchester County [Member] | Hawthorne [Member] | 17 Skyline Drive [Member]
Year Built	1989	[4],[5]
Acquired	1997	[4],[5]
Initial Costs, Building and Improvements	7,269	[4],[5]
Costs Capitalized Subsequent to Acquisition	1,479	[4],[5]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,748	[1],[4],[5]
Total	8,748	[2],[4],[5]
Accumulated Depreciation	3,183	[3],[4],[5]
New York [Member] | Westchester County [Member] | Tarrytown [Member] | 200 White Plains Road [Member]
Year Built	1982	[4]
Acquired	1997	[4]
Initial Costs, Land	378	[4]
Initial Costs, Building and Improvements	8,367	[4]
Costs Capitalized Subsequent to Acquisition	1,918	[4]
Gross Amount at Which Carried at Close of Period, Land	378	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,285	[1],[4]
Total	10,663	[2],[4]
Accumulated Depreciation	4,160	[3],[4]
New York [Member] | Westchester County [Member] | Tarrytown [Member] | 220 White Plains Road [Member]
Year Built	1984	[4]
Acquired	1997	[4]
Initial Costs, Land	367	[4]
Initial Costs, Building and Improvements	8,112	[4]
Costs Capitalized Subsequent to Acquisition	1,686	[4]
Gross Amount at Which Carried at Close of Period, Land	367	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,798	[1],[4]
Total	10,165	[2],[4]
Accumulated Depreciation	3,876	[3],[4]
New York [Member] | Westchester County [Member] | Tarrytown [Member] | 230 White Plains Road [Member]
Year Built	1984	[9]
Acquired	1997	[9]
Initial Costs, Land	124	[9]
Initial Costs, Building and Improvements	1,845	[9]
Costs Capitalized Subsequent to Acquisition	107	[9]
Gross Amount at Which Carried at Close of Period, Land	124	[1],[9]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,952	[1],[9]
Total	2,076	[2],[9]
Accumulated Depreciation	765	[3],[9]
New York [Member] | Westchester County [Member] | White Plains [Member] | 1 Barker Avenue [Member]
Year Built	1975	[4]
Acquired	1997	[4]
Initial Costs, Land	208	[4]
Initial Costs, Building and Improvements	9,629	[4]
Costs Capitalized Subsequent to Acquisition	2,237	[4]
Gross Amount at Which Carried at Close of Period, Land	207	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,867	[1],[4]
Total	12,074	[2],[4]
Accumulated Depreciation	4,433	[3],[4]
New York [Member] | Westchester County [Member] | White Plains [Member] | 3 Barker Avenue [Member]
Year Built	1983	[4]
Acquired	1997	[4]
Initial Costs, Land	122	[4]
Initial Costs, Building and Improvements	7,864	[4]
Costs Capitalized Subsequent to Acquisition	1,818	[4]
Gross Amount at Which Carried at Close of Period, Land	122	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,682	[1],[4]
Total	9,804	[2],[4]
Accumulated Depreciation	3,741	[3],[4]
New York [Member] | Westchester County [Member] | White Plains [Member] | 50 Main Street [Member]
Year Built	1985	[4]
Acquired	1997	[4]
Initial Costs, Land	564	[4]
Initial Costs, Building and Improvements	48,105	[4]
Costs Capitalized Subsequent to Acquisition	12,102	[4]
Gross Amount at Which Carried at Close of Period, Land	564	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	60,207	[1],[4]
Total	60,771	[2],[4]
Accumulated Depreciation	23,722	[3],[4]
New York [Member] | Westchester County [Member] | White Plains [Member] | 11 Martine Avenue [Member]
Year Built	1987	[4]
Acquired	1997	[4]
Initial Costs, Land	127	[4]
Initial Costs, Building and Improvements	26,833	[4]
Costs Capitalized Subsequent to Acquisition	8,723	[4]
Gross Amount at Which Carried at Close of Period, Land	127	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	35,556	[1],[4]
Total	35,683	[2],[4]
Accumulated Depreciation	14,189	[3],[4]
New York [Member] | Westchester County [Member] | White Plains [Member] | 1 Water Street [Member]
Year Built	1979	[4]
Acquired	1997	[4]
Initial Costs, Land	211	[4]
Initial Costs, Building and Improvements	5,382	[4]
Costs Capitalized Subsequent to Acquisition	1,169	[4]
Gross Amount at Which Carried at Close of Period, Land	211	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	6,551	[1],[4]
Total	6,762	[2],[4]
Accumulated Depreciation	2,759	[3],[4]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 100 Corporate Boulevard [Member]
Year Built	1987	[6]
Acquired	1997	[6]
Initial Costs, Land	602	[6]
Initial Costs, Building and Improvements	9,910	[6]
Costs Capitalized Subsequent to Acquisition	1,475	[6]
Gross Amount at Which Carried at Close of Period, Land	602	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,385	[1],[6]
Total	11,987	[2],[6]
Accumulated Depreciation	4,410	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 200 Corporate Boulevard South [Member]
Year Built	1990	[6]
Acquired	1997	[6]
Initial Costs, Land	502	[6]
Initial Costs, Building and Improvements	7,575	[6]
Costs Capitalized Subsequent to Acquisition	1,522	[6]
Gross Amount at Which Carried at Close of Period, Land	502	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,097	[1],[6]
Total	9,599	[2],[6]
Accumulated Depreciation	3,371	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 1 Enterprise Boulevard [Member]
Acquired	1997	[7]
Initial Costs, Land	1,379	[7]
Costs Capitalized Subsequent to Acquisition	1	[7]
Gross Amount at Which Carried at Close of Period, Land	1,380	[1],[7]
Total	1,380	[2],[7]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 1 Executive Boulevard [Member]
Year Built	1982	[4]
Acquired	1997	[4]
Initial Costs, Land	1,104	[4]
Initial Costs, Building and Improvements	11,904	[4]
Costs Capitalized Subsequent to Acquisition	2,830	[4]
Gross Amount at Which Carried at Close of Period, Land	1,105	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	14,733	[1],[4]
Total	15,838	[2],[4]
Accumulated Depreciation	5,989	[3],[4]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 2 Executive Boulevard [Member]
Year Built	1986	[9]
Acquired	1997	[9]
Initial Costs, Land	89	[9]
Initial Costs, Building and Improvements	2,439	[9]
Costs Capitalized Subsequent to Acquisition	100	[9]
Gross Amount at Which Carried at Close of Period, Land	89	[1],[9]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,539	[1],[9]
Total	2,628	[2],[9]
Accumulated Depreciation	978	[3],[9]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 3 Executive Boulevard [Member]
Year Built	1987	[4]
Acquired	1997	[4]
Initial Costs, Land	385	[4]
Initial Costs, Building and Improvements	6,256	[4]
Costs Capitalized Subsequent to Acquisition	2,004	[4]
Gross Amount at Which Carried at Close of Period, Land	385	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,260	[1],[4]
Total	8,645	[2],[4]
Accumulated Depreciation	3,117	[3],[4]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 4 Executive Plaza [Member]
Year Built	1986	[6]
Acquired	1997	[6]
Initial Costs, Land	584	[6]
Initial Costs, Building and Improvements	6,134	[6]
Costs Capitalized Subsequent to Acquisition	2,110	[6]
Gross Amount at Which Carried at Close of Period, Land	584	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,244	[1],[6]
Total	8,828	[2],[6]
Accumulated Depreciation	4,246	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 6 Executive Plaza [Member]
Year Built	1987	[6]
Acquired	1997	[6]
Initial Costs, Land	546	[6]
Initial Costs, Building and Improvements	7,246	[6]
Costs Capitalized Subsequent to Acquisition	1,932	[6]
Gross Amount at Which Carried at Close of Period, Land	546	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,178	[1],[6]
Total	9,724	[2],[6]
Accumulated Depreciation	3,224	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 1 Odell Plaza [Member]
Year Built	1980	[6]
Acquired	1997	[6]
Initial Costs, Land	1,206	[6]
Initial Costs, Building and Improvements	6,815	[6]
Costs Capitalized Subsequent to Acquisition	2,007	[6]
Gross Amount at Which Carried at Close of Period, Land	1,206	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,822	[1],[6]
Total	10,028	[2],[6]
Accumulated Depreciation	3,306	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 3 Odell Plaza [Member]
Year Built	1984	[6]
Acquired	2003	[6]
Initial Costs, Land	1,322	[6]
Initial Costs, Building and Improvements	4,777	[6]
Costs Capitalized Subsequent to Acquisition	2,332	[6]
Gross Amount at Which Carried at Close of Period, Land	1,322	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	7,109	[1],[6]
Total	8,431	[2],[6]
Accumulated Depreciation	2,474	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 5 Odell Plaza [Member]
Year Built	1983	[6]
Acquired	1997	[6]
Initial Costs, Land	331	[6]
Initial Costs, Building and Improvements	2,988	[6]
Costs Capitalized Subsequent to Acquisition	869	[6]
Gross Amount at Which Carried at Close of Period, Land	331	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,857	[1],[6]
Total	4,188	[2],[6]
Accumulated Depreciation	1,721	[3],[6]
New York [Member] | Westchester County [Member] | Yonkers [Member] | 7 Odell Plaza [Member]
Year Built	1984	[6]
Acquired	1997	[6]
Initial Costs, Land	419	[6]
Initial Costs, Building and Improvements	4,418	[6]
Costs Capitalized Subsequent to Acquisition	597	[6]
Gross Amount at Which Carried at Close of Period, Land	419	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	5,015	[1],[6]
Total	5,434	[2],[6]
Accumulated Depreciation	2,024	[3],[6]
Pennsylvania [Member] | Chester County [Member] | Berwyn [Member] | 1000 Westlakes Drive [Member]
Year Built	1989	[4]
Acquired	1997	[4]
Initial Costs, Land	619	[4]
Initial Costs, Building and Improvements	9,016	[4]
Costs Capitalized Subsequent to Acquisition	541	[4]
Gross Amount at Which Carried at Close of Period, Land	619	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	9,557	[1],[4]
Total	10,176	[2],[4]
Accumulated Depreciation	3,709	[3],[4]
Pennsylvania [Member] | Chester County [Member] | Berwyn [Member] | 1055 Westlakes Drive [Member]
Year Built	1990	[4]
Acquired	1997	[4]
Initial Costs, Land	1,951	[4]
Initial Costs, Building and Improvements	19,046	[4]
Costs Capitalized Subsequent to Acquisition	3,072	[4]
Gross Amount at Which Carried at Close of Period, Land	1,951	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	22,118	[1],[4]
Total	24,069	[2],[4]
Accumulated Depreciation	9,293	[3],[4]
Pennsylvania [Member] | Chester County [Member] | Berwyn [Member] | 1205 Westlakes Drive [Member]
Year Built	1988	[4]
Acquired	1997	[4]
Initial Costs, Land	1,323	[4]
Initial Costs, Building and Improvements	20,098	[4]
Costs Capitalized Subsequent to Acquisition	2,964	[4]
Gross Amount at Which Carried at Close of Period, Land	1,323	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,062	[1],[4]
Total	24,385	[2],[4]
Accumulated Depreciation	9,088	[3],[4]
Pennsylvania [Member] | Chester County [Member] | Berwyn [Member] | 1235 Westlakes Drive [Member]
Year Built	1986	[4]
Acquired	1997	[4]
Initial Costs, Land	1,417	[4]
Initial Costs, Building and Improvements	21,215	[4]
Costs Capitalized Subsequent to Acquisition	3,275	[4]
Gross Amount at Which Carried at Close of Period, Land	1,418	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	24,489	[1],[4]
Total	25,907	[2],[4]
Accumulated Depreciation	9,820	[3],[4]
Pennsylvania [Member] | Delaware County [Member] | Lester [Member] | 100 Stevens Drive [Member]
Year Built	1986	[4]
Acquired	1996	[4]
Initial Costs, Land	1,349	[4]
Initial Costs, Building and Improvements	10,018	[4]
Costs Capitalized Subsequent to Acquisition	3,915	[4]
Gross Amount at Which Carried at Close of Period, Land	1,349	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	13,933	[1],[4]
Total	15,282	[2],[4]
Accumulated Depreciation	6,553	[3],[4]
Pennsylvania [Member] | Delaware County [Member] | Lester [Member] | 200 Stevens Drive [Member]
Year Built	1987	[4]
Acquired	1996	[4]
Initial Costs, Land	1,644	[4]
Initial Costs, Building and Improvements	20,186	[4]
Costs Capitalized Subsequent to Acquisition	6,956	[4]
Gross Amount at Which Carried at Close of Period, Land	1,644	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	27,142	[1],[4]
Total	28,786	[2],[4]
Accumulated Depreciation	12,159	[3],[4]
Pennsylvania [Member] | Delaware County [Member] | Lester [Member] | 300 Stevens Drive [Member]
Year Built	1992	[4]
Acquired	1996	[4]
Initial Costs, Land	491	[4]
Initial Costs, Building and Improvements	9,490	[4]
Costs Capitalized Subsequent to Acquisition	1,733	[4]
Gross Amount at Which Carried at Close of Period, Land	491	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,223	[1],[4]
Total	11,714	[2],[4]
Accumulated Depreciation	4,935	[3],[4]
Pennsylvania [Member] | Delaware County [Member] | Media [Member] | 1400 Providence Rd, Center I [Member]
Year Built	1986	[4]
Acquired	1996	[4]
Initial Costs, Land	1,042	[4]
Initial Costs, Building and Improvements	9,054	[4]
Costs Capitalized Subsequent to Acquisition	2,621	[4]
Gross Amount at Which Carried at Close of Period, Land	1,042	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,675	[1],[4]
Total	12,717	[2],[4]
Accumulated Depreciation	5,030	[3],[4]
Pennsylvania [Member] | Delaware County [Member] | Media [Member] | 1400 Providence Rd, Center II [Member]
Year Built	1990	[4]
Acquired	1996	[4]
Initial Costs, Land	1,543	[4]
Initial Costs, Building and Improvements	16,464	[4]
Costs Capitalized Subsequent to Acquisition	4,651	[4]
Gross Amount at Which Carried at Close of Period, Land	1,544	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	21,114	[1],[4]
Total	22,658	[2],[4]
Accumulated Depreciation	9,122	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Bala Cynwyd [Member] | 150 Monument Road [Member]
Year Built	1981	[4]
Acquired	2004	[4]
Initial Costs, Land	2,845	[4]
Initial Costs, Building and Improvements	14,780	[4]
Costs Capitalized Subsequent to Acquisition	3,994	[4]
Gross Amount at Which Carried at Close of Period, Land	2,845	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,774	[1],[4]
Total	21,619	[2],[4]
Accumulated Depreciation	4,721	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Blue Bell [Member] | 4 Sentry Park [Member]
Year Built	1982	[4]
Acquired	2003	[4]
Initial Costs, Land	1,749	[4]
Initial Costs, Building and Improvements	7,721	[4]
Costs Capitalized Subsequent to Acquisition	1,029	[4]
Gross Amount at Which Carried at Close of Period, Land	1,749	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	8,750	[1],[4]
Total	10,499	[2],[4]
Accumulated Depreciation	2,304	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Blue Bell [Member] | 5 Sentry Park East [Member]
Year Built	1984	[4]
Acquired	1996	[4]
Initial Costs, Land	642	[4]
Initial Costs, Building and Improvements	7,992	[4]
Costs Capitalized Subsequent to Acquisition	3,645	[4]
Gross Amount at Which Carried at Close of Period, Land	642	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	11,637	[1],[4]
Total	12,279	[2],[4]
Accumulated Depreciation	4,672	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Blue Bell [Member] | 5 Sentry Park West [Member]
Year Built	1984	[4]
Acquired	1996	[4]
Initial Costs, Land	268	[4]
Initial Costs, Building and Improvements	3,334	[4]
Costs Capitalized Subsequent to Acquisition	644	[4]
Gross Amount at Which Carried at Close of Period, Land	268	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,978	[1],[4]
Total	4,246	[2],[4]
Accumulated Depreciation	1,567	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Blue Bell [Member] | 16 Sentry Park West [Member]
Year Built	1988	[4]
Acquired	2002	[4]
Initial Costs, Land	3,377	[4]
Initial Costs, Building and Improvements	13,511	[4]
Costs Capitalized Subsequent to Acquisition	(2,106)	[4]
Gross Amount at Which Carried at Close of Period, Land	2,405	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	12,377	[1],[4]
Total	14,782	[2],[4]
Accumulated Depreciation	5,608	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Blue Bell [Member] | 18 Sentry Park West [Member]
Year Built	1988	[4]
Acquired	2002	[4]
Initial Costs, Land	3,515	[4]
Initial Costs, Building and Improvements	14,062	[4]
Costs Capitalized Subsequent to Acquisition	(1,868)	[4]
Gross Amount at Which Carried at Close of Period, Land	2,536	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	13,173	[1],[4]
Total	15,709	[2],[4]
Accumulated Depreciation	5,993	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Lower Providence [Member] | 1000 Madison Avenue [Member]
Year Built	1990	[4]
Acquired	1997	[4]
Initial Costs, Land	1,713	[4]
Initial Costs, Building and Improvements	12,559	[4]
Costs Capitalized Subsequent to Acquisition	2,972	[4]
Gross Amount at Which Carried at Close of Period, Land	1,714	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,530	[1],[4]
Total	17,244	[2],[4]
Accumulated Depreciation	6,267	[3],[4]
Pennsylvania [Member] | Montgomery County [Member] | Plymouth Meeting [Member] | 1150 Plymouth Meeting Mall [Member]
Year Built	1970	[4]
Acquired	1997	[4]
Initial Costs, Land	125	[4]
Initial Costs, Building and Improvements	499	[4]
Costs Capitalized Subsequent to Acquisition	30,478	[4]
Gross Amount at Which Carried at Close of Period, Land	6,219	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	24,883	[1],[4]
Total	31,102	[2],[4]
Accumulated Depreciation	9,594	[3],[4]
Connecticut [Member] | Fairfield County [Member] | Norwalk [Member] | 40 Richards Avenue [Member]
Year Built	1985	[4]
Acquired	1998	[4]
Initial Costs, Land	1,087	[4]
Initial Costs, Building and Improvements	18,399	[4]
Costs Capitalized Subsequent to Acquisition	5,053	[4]
Gross Amount at Which Carried at Close of Period, Land	1,087	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,452	[1],[4]
Total	24,539	[2],[4]
Accumulated Depreciation	8,423	[3],[4]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 1266 East Main Street [Member]
Year Built	1984	[4]
Acquired	2002	[4]
Initial Costs, Land	6,638	[4]
Initial Costs, Building and Improvements	26,567	[4]
Costs Capitalized Subsequent to Acquisition	5,059	[4]
Gross Amount at Which Carried at Close of Period, Land	6,638	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	31,626	[1],[4]
Total	38,264	[2],[4]
Accumulated Depreciation	9,583	[3],[4]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 419 West Avenue [Member]
Year Built	1986	[6]
Acquired	1997	[6]
Initial Costs, Land	4,538	[6]
Initial Costs, Building and Improvements	9,246	[6]
Costs Capitalized Subsequent to Acquisition	1,298	[6]
Gross Amount at Which Carried at Close of Period, Land	4,538	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	10,544	[1],[6]
Total	15,082	[2],[6]
Accumulated Depreciation	4,033	[3],[6]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 500 West Avenue [Member]
Year Built	1988	[6]
Acquired	1997	[6]
Initial Costs, Land	415	[6]
Initial Costs, Building and Improvements	1,679	[6]
Costs Capitalized Subsequent to Acquisition	61	[6]
Gross Amount at Which Carried at Close of Period, Land	415	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	1,740	[1],[6]
Total	2,155	[2],[6]
Accumulated Depreciation	693	[3],[6]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 550 West Avenue [Member]
Year Built	1990	[6]
Acquired	1997	[6]
Initial Costs, Land	1,975	[6]
Initial Costs, Building and Improvements	3,856	[6]
Costs Capitalized Subsequent to Acquisition	202	[6]
Gross Amount at Which Carried at Close of Period, Land	1,975	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	4,058	[1],[6]
Total	6,033	[2],[6]
Accumulated Depreciation	1,630	[3],[6]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 600 West Avenue [Member]
Year Built	1999	[6]
Acquired	1999	[6]
Initial Costs, Land	2,305	[6]
Initial Costs, Building and Improvements	2,863	[6]
Costs Capitalized Subsequent to Acquisition	839	[6]
Gross Amount at Which Carried at Close of Period, Land	2,305	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,702	[1],[6]
Total	6,007	[2],[6]
Accumulated Depreciation	1,247	[3],[6]
Connecticut [Member] | Fairfield County [Member] | Stamford [Member] | 650 West Avenue [Member]
Year Built	1998	[6]
Acquired	1998	[6]
Initial Costs, Land	1,328	[6]
Costs Capitalized Subsequent to Acquisition	3,360	[6]
Gross Amount at Which Carried at Close of Period, Land	1,328	[1],[6]
Gross Amount at Which Carried at Close of Period, Building and Improvements	3,360	[1],[6]
Total	4,688	[2],[6]
Accumulated Depreciation	1,368	[3],[6]
District Of Columbia [Member] | Washington [Member] | 1201 Connecticut Avenue, NW [Member]
Year Built	1940	[4]
Acquired	1999	[4]
Initial Costs, Land	14,228	[4]
Initial Costs, Building and Improvements	18,571	[4]
Costs Capitalized Subsequent to Acquisition	5,246	[4]
Gross Amount at Which Carried at Close of Period, Land	14,228	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	23,817	[1],[4]
Total	38,045	[2],[4]
Accumulated Depreciation	8,316	[3],[4]
District Of Columbia [Member] | Washington [Member] | 1400 L Street, NW [Member]
Year Built	1987	[4]
Acquired	1998	[4]
Initial Costs, Land	13,054	[4]
Initial Costs, Building and Improvements	27,423	[4]
Costs Capitalized Subsequent to Acquisition	7,508	[4]
Gross Amount at Which Carried at Close of Period, Land	13,054	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	34,931	[1],[4]
Total	47,985	[2],[4]
Accumulated Depreciation	14,590	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | Capital Office Park Parcel A [Member]
Acquired	2009	[7]
Initial Costs, Land	840	[7]
Costs Capitalized Subsequent to Acquisition	7	[7]
Gross Amount at Which Carried at Close of Period, Land	847	[1],[7]
Total	847	[2],[7]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 9200 Edmonston Road [Member]
Acquired	2006	[4]
Related Encumbrances	4,304	[4]
Initial Costs, Land	1,547	[4]
Initial Costs, Building and Improvements	4,131	[4]
Costs Capitalized Subsequent to Acquisition	(2,486)	[4]
Gross Amount at Which Carried at Close of Period, Land	609	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	2,583	[1],[4]
Total	3,192	[2],[4]
Accumulated Depreciation	1,258	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6301 Ivy Lane [Member]
Acquired	2006	[4]
Related Encumbrances	5,667	[4]
Initial Costs, Land	5,168	[4]
Initial Costs, Building and Improvements	14,706	[4]
Costs Capitalized Subsequent to Acquisition	1,324	[4]
Gross Amount at Which Carried at Close of Period, Land	5,168	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	16,030	[1],[4]
Total	21,198	[2],[4]
Accumulated Depreciation	3,138	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6303 Ivy Lane [Member]
Acquired	2006	[4]
Initial Costs, Land	5,115	[4]
Initial Costs, Building and Improvements	13,860	[4]
Costs Capitalized Subsequent to Acquisition	649	[4]
Gross Amount at Which Carried at Close of Period, Land	5,115	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	14,509	[1],[4]
Total	19,624	[2],[4]
Accumulated Depreciation	3,275	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6305 Ivy Lane [Member]
Acquired	2006	[4]
Related Encumbrances	5,984	[4]
Initial Costs, Land	5,615	[4]
Initial Costs, Building and Improvements	14,420	[4]
Costs Capitalized Subsequent to Acquisition	707	[4]
Gross Amount at Which Carried at Close of Period, Land	5,615	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,127	[1],[4]
Total	20,742	[2],[4]
Accumulated Depreciation	2,855	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6404 Ivy Lane [Member]
Year Built	1987	[4]
Acquired	2006	[4]
Initial Costs, Land	7,578	[4]
Initial Costs, Building and Improvements	20,785	[4]
Costs Capitalized Subsequent to Acquisition	1,451	[4]
Gross Amount at Which Carried at Close of Period, Land	7,578	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	22,236	[1],[4]
Total	29,814	[2],[4]
Accumulated Depreciation	4,811	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6406 Ivy Lane [Member]
Year Built	1991	[4]
Acquired	2006	[4]
Initial Costs, Land	7,514	[4]
Initial Costs, Building and Improvements	21,152	[4]
Costs Capitalized Subsequent to Acquisition	969	[4]
Gross Amount at Which Carried at Close of Period, Land	7,514	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	22,121	[1],[4]
Total	29,635	[2],[4]
Accumulated Depreciation	3,626	[3],[4]
Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6411 Ivy Lane [Member]
Acquired	2006	[4]
Initial Costs, Land	6,867	[4]
Initial Costs, Building and Improvements	17,470	[4]
Costs Capitalized Subsequent to Acquisition	782	[4]
Gross Amount at Which Carried at Close of Period, Land	6,867	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	18,252	[1],[4]
Total	25,119	[2],[4]
Accumulated Depreciation	3,587	[3],[4]
Maryland [Member] | Prince George's County [Member] | Lanham [Member] | 4200 Parliament Place [Member]
Year Built	1989	[4]
Acquired	1998	[4]
Initial Costs, Land	2,114	[4]
Initial Costs, Building and Improvements	13,546	[4]
Costs Capitalized Subsequent to Acquisition	1,023	[4]
Gross Amount at Which Carried at Close of Period, Land	1,393	[1],[4]
Gross Amount at Which Carried at Close of Period, Building and Improvements	15,290	[1],[4]
Total	16,683	[2],[4]
Accumulated Depreciation	$ 6,335	[3],[4]
Minimum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 9200 Edmonston Road [Member]
Year Built	1973	[4]
Minimum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6301 Ivy Lane [Member]
Year Built	1979	[4]
Minimum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6303 Ivy Lane [Member]
Year Built	1980	[4]
Minimum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6305 Ivy Lane [Member]
Year Built	1982	[4]
Minimum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6411 Ivy Lane [Member]
Year Built	1984	[4]
Maximum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 9200 Edmonston Road [Member]
Year Built	2003	[4]
Maximum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6301 Ivy Lane [Member]
Year Built	1995	[4]
Maximum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6303 Ivy Lane [Member]
Year Built	2003	[4]
Maximum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6305 Ivy Lane [Member]
Year Built	1995	[4]
Maximum [Member] | Maryland [Member] | Prince George's County [Member] | Greenbelt [Member] | 6411 Ivy Lane [Member]
Year Built	2005	[4]

[1] The aggregate cost for federal income tax purposes at December 31, 2012 was approximately $3.2 billion.

[2] Properties identified as held for sale at December 31, 2012 are excluded.

[3] Depreciation of buildings and improvements are calculated over lives ranging from the life of the lease to 40 years.

[4] Office Property

[5] This property is located on land leased by the Company.

[6] Office/Flex Property

[7] Land Lease

[8] Industrial/Warehouse Property

[9] Stand-alone Retail Property