Schedule III - Real Estate and Accumulated Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jan. 31, 2014 ft²	Dec. 31, 2013 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 469,766
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,740,313
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,843,637
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,476,804
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,780,084
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	5,280,670
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	7,060,754
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,139,853	$ 994,241	$ 947,664		$ 818,957
Rentable Square Feet (unaudited) | ft²	14,025,856			79,000
Office Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 469,766
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,069,200
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,843,637
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,134,384
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,108,971
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,938,250
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	6,047,221
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,139,853
Rentable Square Feet (unaudited) | ft²	14,025,856
Office Building [Member] | 23925 Park Sorrento, Calabasas, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 1,215
Real Estate and Accumulated Depreciation, Initial Cost of Land	50
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,346
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	495
Real Estate and Accumulated Depreciation, Carrying Amount of Land	50
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	2,841
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	2,891
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,703
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	11,789
Office Building [Member] | 23975 Park Sorrento, Calabasas, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 765
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,720
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,579
Real Estate and Accumulated Depreciation, Carrying Amount of Land	765
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	25,299
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,064
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 14,562
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	104,797
Office Building [Member] | 24025 Park Sorrento, Calabasas, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 845
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,896
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,099
Real Estate and Accumulated Depreciation, Carrying Amount of Land	845
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,995
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	24,840
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 13,559
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	108,670
Office Building [Member] | 2829 Townsgate Rd., Thousand Oaks, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 5,248
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,001
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,461
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,248
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	15,462
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,710
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 10,476
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	84,098
Office Building [Member] | 2240 E. Imperial Highway, El Segundo, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,044
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,763
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	29,475
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,048
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	41,234
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	42,282
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 23,131
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	122,870
Office Building [Member] | 2250 E. Imperial Highway, El Segundo, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,579
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	29,062
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	34,978
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,547
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	64,072
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	66,619
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 48,914
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	298,728
Office Building [Member] | 2260 E. Imperial Highway, El Segundo, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,518
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	28,370
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	36,781
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,547
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	65,122
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	67,669
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,560
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	298,728
Office Building [Member] | 909 Sepulveda Boulevard, El Segundo, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances
Real Estate and Accumulated Depreciation, Initial Cost of Land	3,577
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,042
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	46,328
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,577
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	80,370
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	83,947
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 32,004
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	244,136
Office Building [Member] | 999 Sepulveda Boulevard, El Segundo, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,407
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	34,326
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	12,392
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,407
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	46,718
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	48,125
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 19,766
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	128,588
Office Building [Member] | 6115 W. Sunset Boulevard, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,313
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	24,922
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,455
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,783
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,238
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 901
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	26,105
Office Building [Member] | 6121 W. Sunset Boulevard, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 11,120
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	4,256
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	71,644
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,703
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	78,317
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	87,020
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,299
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	91,173
Office Building [Member] | 1525 N. Gower Street, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,318
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,867
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,318
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,870
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,188
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 135
Real estate and accumulated depreciation, life used for depreciation	35 years
Office Building [Member] | 1575 N. Gower Street, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 22,153
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	51
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	97,669
Real Estate and Accumulated Depreciation, Carrying Amount of Land	22,153
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	97,720
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	119,873
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 607
Real estate and accumulated depreciation, life used for depreciation	35 years
Office Building [Member] | 1500 N. El Centro Avenue, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 9,235
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	36,477
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,235
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	36,498
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	45,733
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 36
Real estate and accumulated depreciation, life used for depreciation	35 years
Office Building [Member] | 1550 N. El Centro Avenue, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 16,970
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	39
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	123,646
Real Estate and Accumulated Depreciation, Carrying Amount of Land	16,970
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	123,685
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	140,655
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,101
Real estate and accumulated depreciation, life used for depreciation	35 years
Office Building [Member] | 6255 Sunset Boulevard, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances
Real Estate and Accumulated Depreciation, Initial Cost of Land	18,111
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	60,320
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	37,000
Real Estate and Accumulated Depreciation, Carrying Amount of Land	18,111
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	97,320
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	115,431
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 17,653
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	323,922
Office Building [Member] | 3750 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 1,941
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,051
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,992
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	12,992
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,628
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	10,457
Office Building [Member] | 3760 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 17,467
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,652
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	29,119
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	29,119
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 23,203
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	165,278
Office Building [Member] | 3780 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 22,319
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	18,983
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	41,302
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	41,302
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 34,274
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	219,745
Office Building [Member] | 3800 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 19,408
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	18,504
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	37,912
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	37,912
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 21,532
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	192,476
Office Building [Member] | 3840 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 13,586
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	9,429
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,015
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,015
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 13,922
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	136,026
Office Building [Member] | 3880 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 9,704
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,134
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	20,838
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,838
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,416
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	96,035
Office Building [Member] | 3900 Kilroy Airport Way, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	$ 12,615
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,009
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,624
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,624
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 14,967
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	129,893
Office Building [Member] | Kilroy Airport Center, Phase IV, Long Beach, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	$ 4,997
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	4,997
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,997
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,989
Real estate and accumulated depreciation, life used for depreciation	35 years
Office Building [Member] | 8560 West Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 9,720
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	50,956
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,720
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	50,956
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	60,676
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 170
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	71,875
Office Building [Member] | 8570 West Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 31,693
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,974
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	31,693
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,974
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	59,667
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 82
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	43,603
Office Building [Member] | 8580 West Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 10,013
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,695
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,013
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,695
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,708
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 11
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	7,126
Office Building [Member] | 8590 West Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 39,954
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,884
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	39,954
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,884
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	67,838
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 92
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	56,095
Office Building [Member] | 12100 W. Olympic Boulevard, Los Angeles, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 170,000
Real Estate and Accumulated Depreciation, Initial Cost of Land	352
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	45,611
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,548
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,633
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	53,878
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	63,511
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 23,595
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	152,048
Office Building [Member] | 12200 W. Olympic Boulevard, Los Angeles, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,329
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,488
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	17,825
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,977
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	53,665
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	57,642
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 33,159
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	150,832
Office Building [Member] | 12233 Olympic Blvd, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances
Real Estate and Accumulated Depreciation, Initial Cost of Land	22,100
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	53,170
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,712
Real Estate and Accumulated Depreciation, Carrying Amount of Land	22,100
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	56,882
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	78,982
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,382
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	151,029
Office Building [Member] | 12312 W. Olympic Boulevard, Los Angeles, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,325
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,202
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,326
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,399
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,454
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,853
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,129
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	76,644
Office Building [Member] | 1633 26th Street, Santa Monica, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,080
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,672
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,966
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,040
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	9,678
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	11,718
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,364
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	44,915
Office Building [Member] | 2100 Colorado Avenue, Santa Monica, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 94,754
Real Estate and Accumulated Depreciation, Initial Cost of Land	5,474
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	26,087
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,411
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,476
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	40,496
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	45,972
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 20,616
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	102,864
Office Building [Member] | 3130 Wilshire Boulevard, Santa Monica, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 8,921
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,579
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	12,137
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,188
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	18,449
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	27,637
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 12,835
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	88,340
Office Building [Member] | 501 Santa Monica Boulevard, Santa Monica, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,547
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,044
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	10,986
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,551
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	27,577
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 12,803
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	73,212
Office Building [Member] | 2211 Michelson, Irvine, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 9,319
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	82,836
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,310
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,319
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	88,146
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	97,465
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 20,843
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	271,556
Office Building [Member] | 12225 El Camino Real, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,700
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	9,633
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,982
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,673
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,642
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,315
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,644
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	58,401
Office Building [Member] | 12235 El Camino Real, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,507
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,543
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,584
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,540
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	14,094
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,634
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 8,544
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	53,751
Office Building [Member] | 12340 El Camino Real, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,201
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	13,896
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,013
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,201
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	21,909
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,110
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,611
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	87,774
Office Building [Member] | 12390 El Camino Real, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,453
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,981
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,377
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,453
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,358
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,811
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 8,283
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	72,332
Office Building [Member] | 12348 High Bluff Drive, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,629
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	3,096
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,829
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,629
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,925
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	9,554
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 5,457
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	38,806
Office Building [Member] | 12400 High Bluff Drive, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 15,167
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	40,497
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	13,109
Real Estate and Accumulated Depreciation, Carrying Amount of Land	15,167
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	53,606
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	68,773
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 23,583
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	209,220
Office Building [Member] | 3579 Valley Centre Drive, Del Mar, California One [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,167
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	6,897
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,419
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,858
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,625
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,483
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 8,426
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	52,418
Office Building [Member] | 3611 Valey Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,184
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	19,352
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	18,501
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,259
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	36,778
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	42,037
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 20,980
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	130,047
Office Building [Member] | 3661 Valley Centre Drive, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,038
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,144
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	13,100
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,725
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	33,557
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	38,282
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 17,605
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	128,330
Office Building [Member] | 3721 Valley Centre Drive, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,297
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	18,967
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	14,468
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,254
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	33,478
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	37,732
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 12,666
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	115,193
Office Building [Member] | 3811 Valley Centre Drive, Del Mar, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,452
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	16,152
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	20,092
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,457
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	35,239
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	39,696
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 18,943
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	112,067
Office Building [Member] | 12770 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 9,360
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	26,880
Real Estate and Accumulated Depreciation, Carrying Amount of Land	9,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	26,880
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	36,240
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 0
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	73,032
Office Building [Member] | 12780 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 18,398
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	54,954
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,626
Real Estate and Accumulated Depreciation, Carrying Amount of Land	18,398
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	56,580
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	74,978
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,289
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	140,591
Office Building [Member] | 12790 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 10,252
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,236
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,342
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,252
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,578
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	32,830
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,816
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	78,836
Office Building [Member] | 13280 Evening Creek Drive, South I-15 Corridor, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,701
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,398
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,589
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,701
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,987
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,688
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,945
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	41,196
Office Building [Member] | 13290 Evening Creek Drive, South I-15 Corridor, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 5,229
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,871
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,919
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,229
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,790
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	23,019
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,261
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	61,180
Office Building [Member] | 13480 Evening Creek Drive, North I-15 Corridor, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,997
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	48,100
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,997
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	48,100
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	56,097
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 15,057
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	149,817
Office Building [Member] | 13500 Evening Creek Drive, North I-15 Corridor, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,581
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,903
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	8,678
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,580
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	44,582
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	52,162
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 17,324
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	147,533
Office Building [Member] | 13520 Evening Creek Drive, North I-15 Corridor, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,581
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	35,903
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	11,687
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,580
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	47,591
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	55,171
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 19,088
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	141,128
Office Building [Member] | 2355 Northside Drive, Mission Valley, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,066
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,332
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,297
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,344
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,351
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,695
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,392
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	53,610
Office Building [Member] | 2365 Northside Drive, Mission Valley, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,359
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,257
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,332
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,015
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,933
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	29,948
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,206
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	96,437
Office Building [Member] | 2375 Northside Drive, Mission Valley, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,947
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,146
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,659
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,213
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,539
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,752
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,278
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	51,516
Office Building [Member] | 2385 Northside Drive, Mission Valley, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,752
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	14,513
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	5,299
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,552
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,012
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,564
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 5,212
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	89,023
Office Building [Member] | 2305 Historic Decatur Road, San Diego, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 5,240
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,220
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,390
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,240
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	29,610
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	34,850
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,143
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	103,900
Office Building [Member] | 10390 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 3,267
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,779
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,501
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,267
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,280
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	16,547
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,222
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	68,400
Office Building [Member] | 10394 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,696
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,134
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	661
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,671
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,820
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,491
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,312
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	59,327
Office Building [Member] | 10398 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,947
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,152
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,317
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,222
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	7,194
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	8,416
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,224
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	43,645
Office Building [Member] | 10421 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,926
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,979
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	22,097
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,926
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	30,076
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	33,002
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 18,321
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	75,899
Office Building [Member] | 10445 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,247
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	5,945
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,832
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,809
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,215
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	10,024
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,941
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	48,709
Office Building [Member] | 10455 Pacific Center Ct., Sorrento Mesa, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,044
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,701
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	82
Real Estate and Accumulated Depreciation, Carrying Amount of Land	3,780
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,047
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	14,827
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,796
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	88,577
Office Building [Member] | 4690 Executive Dr., University Towne Centre, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 1,623
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,926
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	3,504
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,623
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,430
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	13,053
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,322
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	47,846
Office Building [Member] | Bohannon Drive 4100, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,835
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,526
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	505
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,860
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	16,006
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,866
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,752
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	47,379
Office Building [Member] | Bohannon Drive 4200, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,798
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,406
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,026
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,662
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,568
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,230
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,312
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	45,451
Office Building [Member] | Bohannon Drive 4300, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 6,527
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,958
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,749
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,470
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	23,764
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	30,234
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 5,031
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	63,079
Office Building [Member] | Bohannon Drive 4400, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,798
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,406
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,469
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,939
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,734
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,673
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,501
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	48,146
Office Building [Member] | Bohannon Drive 4500, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 6,527
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,957
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,729
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,470
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,743
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	29,213
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,939
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	63,078
Office Building [Member] | Bohannon Drive 4600, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,798
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,406
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,362
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,939
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	17,627
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,566
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,423
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	48,147
Office Building [Member] | Bohannon Drive 4700, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 6,527
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	20,958
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,397
Real Estate and Accumulated Depreciation, Carrying Amount of Land	6,470
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	22,412
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,882
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,825
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	63,078
Office Building [Member] | 1290-1300 Terra Bella Avenue, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 28,730
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	27,555
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	28,730
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,555
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	56,285
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 810
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	114,175
Office Building [Member] | Fairchild Drive, 331, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 18,396
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	17,712
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	7,955
Real Estate and Accumulated Depreciation, Carrying Amount of Land	18,396
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	25,667
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	44,063
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,871
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	87,147
Office Building [Member] | 680 E Middlefield Road, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 34,605
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	56,464
Real Estate and Accumulated Depreciation, Carrying Amount of Land	34,605
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	56,464
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	91,069
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,099
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	170,090
Office Building [Member] | 690 E Middlefield Road, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 34,755
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	56,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land	34,755
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	56,707
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	91,462
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,116
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	170,823
Office Building [Member] | 1701 Page Mill Rd, Palo Alto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	99,522
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	99,522
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	99,522
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 0
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	128,688
Office Building [Member] | 3150 Porter Drive, Palo Alto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	21,715
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	21,715
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,715
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 0
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	36,897
Office Building [Member] | 900 Jefferson Ave., Redwood City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 16,668
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	109,526
Real Estate and Accumulated Depreciation, Carrying Amount of Land	18,063
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	108,131
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	126,194
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,270
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	228,505
Office Building [Member] | 900 Middlefield Road, Redwood City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,959
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	49,592
Real Estate and Accumulated Depreciation, Carrying Amount of Land	8,626
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	48,925
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	57,551
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,801
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	118,764
Office Building [Member] | 303 Second Street, San Francisco, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 125,756
Real Estate and Accumulated Depreciation, Initial Cost of Land	63,550
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	154,153
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	46,607
Real Estate and Accumulated Depreciation, Carrying Amount of Land	63,550
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	200,760
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	264,310
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 50,705
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	740,047
Office Building [Member] | 100 First Street, San Francisco, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 49,150
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	131,238
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	32,041
Real Estate and Accumulated Depreciation, Carrying Amount of Land	49,150
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	163,279
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	212,429
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 38,668
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	467,095
Office Building [Member] | 250 Brannan Street, San Francisco, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 7,630
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,770
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,416
Real Estate and Accumulated Depreciation, Carrying Amount of Land	7,630
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,186
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	34,816
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,256
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	95,008
Office Building [Member] | 201 Third Street, San Francisco, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 19,260
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	84,018
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	43,206
Real Estate and Accumulated Depreciation, Carrying Amount of Land	19,260
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	127,224
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	146,484
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 29,948
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	346,538
Office Building [Member] | 301 Brannan Street, San Francisco, California [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 5,910
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	22,450
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,221
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,910
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	24,671
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	30,581
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 5,115
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	74,430
Office Building [Member] | 360 Third St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	88,235
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	112,193
Real Estate and Accumulated Depreciation, Carrying Amount of Land	28,504
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	171,924
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	200,428
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 25,219
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	429,796
Office Building [Member] | 333 Brannan, San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 18,645
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	77,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land	18,645
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	77,623
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	96,268
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,838
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	185,602
Office Building [Member] | 350 Mission Street, San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 52,815
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	210,133
Real Estate and Accumulated Depreciation, Carrying Amount of Land	52,815
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	210,133
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	262,948
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,590
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	455,340
Office Building [Member] | 1310 Chesapeake Terrace, Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 16,700
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	11,020
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	490
Real Estate and Accumulated Depreciation, Carrying Amount of Land	16,700
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,510
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,210
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,064
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	76,244
Office Building [Member] | 1315 Chesapeake Terrace, Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 12,260
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	7,930
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	464
Real Estate and Accumulated Depreciation, Carrying Amount of Land	12,260
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,394
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	20,654
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,002
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	55,635
Office Building [Member] | 1320-1324 Chesapeake Terrace, Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 17,360
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	10,720
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	544
Real Estate and Accumulated Depreciation, Carrying Amount of Land	17,360
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	11,264
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	28,624
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,385
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	79,720
Office Building [Member] | 1325-1327 Chesapeake Terrace, Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 12,610
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	8,160
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	352
Real Estate and Accumulated Depreciation, Carrying Amount of Land	12,610
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	8,512
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	21,122
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 1,024
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	55,383
Office Building [Member] | 505 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 37,843
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,163
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	50,554
Real Estate and Accumulated Depreciation, Carrying Amount of Land	37,943
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	51,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	89,560
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,442
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	212,322
Office Building [Member] | 555 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 37,843
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	1,163
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	50,551
Real Estate and Accumulated Depreciation, Carrying Amount of Land	37,943
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	51,614
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	89,557
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 3,442
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	212,322
Office Building [Member] | 605 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 29,014
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	891
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	77,359
Real Estate and Accumulated Depreciation, Carrying Amount of Land	29,090
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	78,174
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	107,264
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,479
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	162,785
Office Building [Member] | 599 N. Mathilda Avenue, Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 13,538
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,559
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	58
Real Estate and Accumulated Depreciation, Carrying Amount of Land	13,538
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	12,617
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	26,155
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,374
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	75,810
Office Building [Member] | 601 108th Avenue, Bellevue, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	214,095
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	32,394
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	246,489
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	246,489
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 51,328
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	488,470
Office Building [Member] | NE 4th Street 10900 Bellevue, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 25,080
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	150,877
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	21,120
Real Estate and Accumulated Depreciation, Carrying Amount of Land	25,080
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	171,997
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	197,077
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 31,254
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	416,755
Office Building [Member] | 10210 NE Points Dr., Kirkland, Washington [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 4,336
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,187
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,933
Real Estate and Accumulated Depreciation, Carrying Amount of Land	4,336
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	27,120
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	31,456
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,151
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	84,641
Office Building [Member] | 10220 NE Points Dr., Kirkland, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances
Real Estate and Accumulated Depreciation, Initial Cost of Land	2,554
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	12,080
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,099
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,554
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	13,179
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	15,733
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 2,956
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	49,851
Office Building [Member] | 10230 NE Points Dr., Kirkland, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 5,071
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	24,694
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,281
Real Estate and Accumulated Depreciation, Carrying Amount of Land	5,071
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	28,975
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	34,046
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,430
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	98,982
Office Building [Member] | 3933 Lake WA Blvd. NE, Kirkland, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 2,380
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	15,114
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,965
Real Estate and Accumulated Depreciation, Carrying Amount of Land	2,380
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	20,079
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	22,459
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 4,331
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	46,450
Office Building [Member] | 837 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	37,404
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	2,547
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	39,951
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	39,951
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 6,914
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	111,580
Office Building [Member] | 701 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances
Real Estate and Accumulated Depreciation, Initial Cost of Land	0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	48,027
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	4,186
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	52,213
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	52,213
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,942
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	138,994
Office Building [Member] | 801 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	58,537
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	183
Real Estate and Accumulated Depreciation, Carrying Amount of Land	0
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	58,720
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	58,720
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 9,835
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	169,412
Office Building [Member] | 320 Westlake Avenue North, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 78,041
Real Estate and Accumulated Depreciation, Initial Cost of Land	14,710
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	82,018
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	1,080
Real Estate and Accumulated Depreciation, Carrying Amount of Land	14,710
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	83,098
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	97,808
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 11,082
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	184,643
Office Building [Member] | 321 Terry Avenue North, Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 10,430
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	60,003
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	244
Real Estate and Accumulated Depreciation, Carrying Amount of Land	10,430
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	60,247
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	70,677
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 8,463
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	135,755
Office Building [Member] | 401 Terry Avenue North, Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Initial Cost of Land	$ 22,500
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	77,046
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	0
Real Estate and Accumulated Depreciation, Carrying Amount of Land	22,500
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	77,046
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	99,546
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 7,556
Real estate and accumulated depreciation, life used for depreciation	35 years
Rentable Square Feet (unaudited) | ft²	140,605
Undeveloped Land and CIP Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real estate and accumulated depreciation, amount of encumbrances	$ 0
Real Estate and Accumulated Depreciation, Initial Cost of Land	671,113
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	0
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	342,420
Real Estate and Accumulated Depreciation, Carrying Amount of Land	671,113
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	342,420
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	1,013,533
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 0
Rentable Square Feet (unaudited) | ft²	0