Schedule III-REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	$ 144,791
Initial Cost
Land	363,612
Bldg. & Improve.	1,591,752
Net Improvements (Write-Offs) Since Acquisition	106,008
Gross Amount at Which Carried
Land	363,612
Building and Improvements	1,697,760
Total	2,061,372	$ 2,036,794
Accumulated Depreciation	369,661	$ 320,857	$ 271,683	$ 231,080
Other disclosures
Federal tax cost basis	2,100,000
Office | 7083 Hollywood Blvd Los Angeles, CA
Initial Cost
Land	6,276
Bldg. & Improve.	13,161
Net Improvements (Write-Offs) Since Acquisition	3,170
Gross Amount at Which Carried
Land	6,276
Building and Improvements	16,331
Total	22,607
Accumulated Depreciation	4,857
Office | 800 N Capitol Street Washington, DC
Initial Cost
Bldg. & Improve.	109,948
Net Improvements (Write-Offs) Since Acquisition	(8,808)
Gross Amount at Which Carried
Building and Improvements	101,140
Total	101,140
Accumulated Depreciation	25,592
Office | 370 L'Enfant Prom Washington, DC
Initial Cost
Land	33,936
Bldg. & Improve.	145,796
Net Improvements (Write-Offs) Since Acquisition	(5,513)
Gross Amount at Which Carried
Land	33,936
Building and Improvements	140,283
Total	174,219
Accumulated Depreciation	36,060
Office | 260 Townsend San Francisco, CA
Initial Cost
Land	7,574
Bldg. & Improve.	13,843
Net Improvements (Write-Offs) Since Acquisition	1,882
Gross Amount at Which Carried
Land	7,574
Building and Improvements	15,725
Total	23,299
Accumulated Depreciation	6,073
Office | 830 1st Street Washington, DC
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	46,000
Initial Cost
Land	18,095
Bldg. & Improve.	62,017
Net Improvements (Write-Offs) Since Acquisition	(1,279)
Gross Amount at Which Carried
Land	18,095
Building and Improvements	60,738
Total	78,833
Accumulated Depreciation	14,189
Office | 200 S College Street Charlotte, NC
Initial Cost
Land	7,702
Bldg. & Improve.	109,006
Net Improvements (Write-Offs) Since Acquisition	5,300
Gross Amount at Which Carried
Land	7,702
Building and Improvements	114,306
Total	122,008
Accumulated Depreciation	31,750
Office | 3601 S Congress Avenue Austin, TX
Initial Cost
Land	9,569
Bldg. & Improve.	18,593
Net Improvements (Write-Offs) Since Acquisition	2,129
Gross Amount at Which Carried
Land	9,569
Building and Improvements	20,722
Total	30,291
Accumulated Depreciation	5,632
Office | 899 N Capitol Street Washington, DC
Initial Cost
Land	34,641
Bldg. & Improve.	84,466
Net Improvements (Write-Offs) Since Acquisition	6,688
Gross Amount at Which Carried
Land	34,641
Building and Improvements	91,154
Total	125,795
Accumulated Depreciation	20,971
Office | 999 N Capitol Street Washington, DC
Initial Cost
Land	32,221
Bldg. & Improve.	86,526
Net Improvements (Write-Offs) Since Acquisition	12,101
Gross Amount at Which Carried
Land	32,221
Building and Improvements	98,627
Total	130,848
Accumulated Depreciation	23,204
Office | 901 N Capitol Street Washington, DC
Initial Cost
Land	27,117
Net Improvements (Write-Offs) Since Acquisition	3,902
Gross Amount at Which Carried
Land	27,117
Building and Improvements	3,902
Total	31,019
Accumulated Depreciation	1,083
Office | 1333 Broadway Oakland, CA
Initial Cost
Land	7,048
Bldg. & Improve.	41,578
Net Improvements (Write-Offs) Since Acquisition	9,553
Gross Amount at Which Carried
Land	7,048
Building and Improvements	51,131
Total	58,179
Accumulated Depreciation	9,658
Office | 1901 Harrison Street Oakland, CA
Initial Cost
Land	3,838
Bldg. & Improve.	68,106
Net Improvements (Write-Offs) Since Acquisition	5,893
Gross Amount at Which Carried
Land	3,838
Building and Improvements	73,999
Total	77,837
Accumulated Depreciation	17,345
Office | 2100 Franklin Street Oakland, CA
Initial Cost
Land	4,277
Bldg. & Improve.	34,033
Net Improvements (Write-Offs) Since Acquisition	14,071
Gross Amount at Which Carried
Land	4,277
Building and Improvements	48,104
Total	52,381
Accumulated Depreciation	12,956
Office | 2101 Webster Street Oakland, CA
Initial Cost
Land	4,752
Bldg. & Improve.	109,812
Net Improvements (Write-Offs) Since Acquisition	22,592
Gross Amount at Which Carried
Land	4,752
Building and Improvements	132,404
Total	137,156
Accumulated Depreciation	29,834
Office | 2353 Webster Street Parking Garage Oakland, CA
Initial Cost
Bldg. & Improve.	9,138
Net Improvements (Write-Offs) Since Acquisition	51
Gross Amount at Which Carried
Building and Improvements	9,189
Total	9,189
Accumulated Depreciation	1,681
Office | 1 Kaiser Plaza Oakland, CA
Initial Cost
Land	9,261
Bldg. & Improve.	113,619
Net Improvements (Write-Offs) Since Acquisition	13,195
Gross Amount at Which Carried
Land	9,261
Building and Improvements	126,814
Total	136,075
Accumulated Depreciation	28,024
Office | 980 9th Street Sacramento, CA
Initial Cost
Land	3,380
Bldg. & Improve.	86,939
Net Improvements (Write-Offs) Since Acquisition	4,453
Gross Amount at Which Carried
Land	3,380
Building and Improvements	91,392
Total	94,772
Accumulated Depreciation	16,541
Office | 1010 8th Street Parking Garage & Retail Sacramento, CA
Initial Cost
Land	1,020
Bldg. & Improve.	1,980
Net Improvements (Write-Offs) Since Acquisition	96
Gross Amount at Which Carried
Land	1,020
Building and Improvements	2,076
Total	3,096
Accumulated Depreciation	376
Office | 211 Main Street San Francisco, CA
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	29,201
Initial Cost
Land	14,364
Bldg. & Improve.	106,875
Net Improvements (Write-Offs) Since Acquisition	1,339
Gross Amount at Which Carried
Land	14,364
Building and Improvements	108,214
Total	122,578
Accumulated Depreciation	25,011
Office | 11600 Wilshire Blvd Los Angeles, CA
Initial Cost
Land	3,477
Bldg. & Improve.	18,522
Net Improvements (Write-Offs) Since Acquisition	1,483
Gross Amount at Which Carried
Land	3,477
Building and Improvements	20,005
Total	23,482
Accumulated Depreciation	3,082
Office | 11620 Wilshire Blvd Los Angeles, CA
Initial Cost
Land	7,672
Bldg. & Improve.	51,999
Net Improvements (Write-Offs) Since Acquisition	8,013
Gross Amount at Which Carried
Land	7,672
Building and Improvements	60,012
Total	67,684
Accumulated Depreciation	9,086
Office | 4750 Wilshire Blvd Los Angeles, CA
Initial Cost
Land	16,633
Bldg. & Improve.	28,985
Net Improvements (Write-Offs) Since Acquisition	58
Gross Amount at Which Carried
Land	16,633
Building and Improvements	29,043
Total	45,676
Accumulated Depreciation	1,475
Office | Lindblade Media Center Los Angeles, CA
Initial Cost
Land	6,342
Bldg. & Improve.	11,568
Gross Amount at Which Carried
Land	6,342
Building and Improvements	11,568
Total	17,910
Accumulated Depreciation	460
Office | 2 Kaiser Plaza Oakland, CA
Initial Cost
Land	10,931
Bldg. & Improve.	110
Net Improvements (Write-Offs) Since Acquisition	109
Gross Amount at Which Carried
Land	10,931
Building and Improvements	219
Total	11,150
Accumulated Depreciation	7
Multifamily | 3636 McKinney Avenue Dallas, TX
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	9,533
Initial Cost
Land	3,806
Bldg. & Improve.	11,077
Net Improvements (Write-Offs) Since Acquisition	383
Gross Amount at Which Carried
Land	3,806
Building and Improvements	11,460
Total	15,266
Accumulated Depreciation	1,698
Multifamily | 3839 McKinney Avenue Dallas, TX
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	6,324
Initial Cost
Land	1,679
Bldg. & Improve.	8,621
Net Improvements (Write-Offs) Since Acquisition	226
Gross Amount at Which Carried
Land	1,679
Building and Improvements	8,847
Total	10,526
Accumulated Depreciation	1,325
Multifamily | 4649 Cole Avenue Dallas, TX
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	23,989
Initial Cost
Land	17,483
Bldg. & Improve.	16,355
Net Improvements (Write-Offs) Since Acquisition	5,236
Gross Amount at Which Carried
Land	17,483
Building and Improvements	21,591
Total	39,074
Accumulated Depreciation	3,377
Multifamily | Memorial Hills Houston, TX
SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION
Encumbrances	29,744
Initial Cost
Land	9,811
Bldg. & Improve.	40,150
Net Improvements (Write-Offs) Since Acquisition	132
Gross Amount at Which Carried
Land	9,811
Building and Improvements	40,282
Total	50,093
Accumulated Depreciation	5,913
Multifamily | 47 E 34th Street New York, NY
Initial Cost
Land	30,612
Bldg. & Improve.	31,145
Net Improvements (Write-Offs) Since Acquisition	1,405
Gross Amount at Which Carried
Land	30,612
Building and Improvements	32,550
Total	63,162
Accumulated Depreciation	3,348
Hotel | Courtyard Oakland Oakland, CA
Initial Cost
Land	4,384
Bldg. & Improve.	16,168
Net Improvements (Write-Offs) Since Acquisition	1,223
Gross Amount at Which Carried
Land	4,384
Building and Improvements	17,391
Total	21,775
Accumulated Depreciation	4,245
Hotel | Sheraton Grand Hotel Sacramento, CA
Initial Cost
Land	3,497
Bldg. & Improve.	107,447
Net Improvements (Write-Offs) Since Acquisition	(4,101)
Gross Amount at Which Carried
Land	3,497
Building and Improvements	103,346
Total	106,843
Accumulated Depreciation	20,180
Hotel | Sheraton Grand Hotel Parking & Retail Sacramento, CA
Initial Cost
Land	6,552
Bldg. & Improve.	10,996
Net Improvements (Write-Offs) Since Acquisition	(68)
Gross Amount at Which Carried
Land	6,552
Building and Improvements	10,928
Total	17,480
Accumulated Depreciation	2,134
Hotel | Los Angeles, CA
Initial Cost
Land	15,662
Bldg. & Improve.	23,173
Net Improvements (Write-Offs) Since Acquisition	1,094
Gross Amount at Which Carried
Land	15,662
Building and Improvements	24,267
Total	39,929
Accumulated Depreciation	$ 2,494