Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 254,365
Initial cost, land and improvements	2,371,628
Initial cost, buildings and Improvements	2,699,959
Costs capitalized subsequent to acquisition/ improvement	5,118,459
Land and improvements, gross	2,503,621
Buildings and improvements, gross	7,686,425
Land and improvements and buildings and improvements, gross	10,190,046
Accumulated depreciation	$ 1,798,646	$ 1,561,361	$ 1,391,368	$ 1,264,162
Rentable square feet | ft²	14,620,166
3101-3243 S. La Cienega Blvd., Culver City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 150,718
Initial cost, buildings and Improvements	31,033
Costs capitalized subsequent to acquisition/ improvement	227
Land and improvements, gross	150,718
Buildings and improvements, gross	31,259
Land and improvements and buildings and improvements, gross	181,977
Accumulated depreciation	$ 6,127
Depreciation life	35 years
Rentable square feet | ft²	151,908
2240 E. Imperial Highway, El Segundo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,044
Initial cost, buildings and Improvements	11,763
Costs capitalized subsequent to acquisition/ improvement	29,551
Land and improvements, gross	1,048
Buildings and improvements, gross	41,310
Land and improvements and buildings and improvements, gross	42,358
Accumulated depreciation	$ 28,203
Depreciation life	35 years
Rentable square feet | ft²	122,870
2250 E. Imperial Highway, El Segundo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,579
Initial cost, buildings and Improvements	29,062
Costs capitalized subsequent to acquisition/ improvement	36,311
Land and improvements, gross	2,547
Buildings and improvements, gross	65,405
Land and improvements and buildings and improvements, gross	67,952
Accumulated depreciation	$ 56,603
Depreciation life	35 years
Rentable square feet | ft²	298,728
2260 E. Imperial Highway, El Segundo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,518
Initial cost, buildings and Improvements	28,370
Costs capitalized subsequent to acquisition/ improvement	36,781
Land and improvements, gross	2,547
Buildings and improvements, gross	65,122
Land and improvements and buildings and improvements, gross	67,669
Accumulated depreciation	$ 18,563
Depreciation life	35 years
Rentable square feet | ft²	298,728
909 N. Pacific Coast Highway, El Segundo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,577
Initial cost, buildings and Improvements	34,042
Costs capitalized subsequent to acquisition/ improvement	51,773
Land and improvements, gross	3,577
Buildings and improvements, gross	85,815
Land and improvements and buildings and improvements, gross	89,392
Accumulated depreciation	$ 44,727
Depreciation life	35 years
Rentable square feet | ft²	244,136
999 N. Pacific Coast Highway, El Segundo, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,407
Initial cost, buildings and Improvements	34,326
Costs capitalized subsequent to acquisition/ improvement	17,295
Land and improvements, gross	1,407
Buildings and improvements, gross	51,621
Land and improvements and buildings and improvements, gross	53,028
Accumulated depreciation	$ 27,429
Depreciation life	35 years
Rentable square feet | ft²	128,588
1350 Ivar Ave., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,575
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	13,725
Land and improvements, gross	1,575
Buildings and improvements, gross	13,725
Land and improvements and buildings and improvements, gross	15,300
Accumulated depreciation	$ 65
Depreciation life	35 years
Rentable square feet | ft²	16,448
1355 Vine St., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 17,588
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	114,603
Land and improvements, gross	17,588
Buildings and improvements, gross	114,603
Land and improvements and buildings and improvements, gross	132,191
Accumulated depreciation	$ 549
Depreciation life	35 years
Rentable square feet | ft²	183,129
1375 Vine St., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,578
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	97,470
Land and improvements, gross	15,578
Buildings and improvements, gross	97,470
Land and improvements and buildings and improvements, gross	113,048
Accumulated depreciation	$ 461
Depreciation life	35 years
Rentable square feet | ft²	159,236
1395 Vine St., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 278
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	3,138
Land and improvements, gross	278
Buildings and improvements, gross	3,138
Land and improvements and buildings and improvements, gross	3,417
Accumulated depreciation	$ 16
Depreciation life	35 years
Rentable square feet | ft²	2,575
6115 W. Sunset Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,313
Initial cost, buildings and Improvements	3
Costs capitalized subsequent to acquisition/ improvement	16,454
Land and improvements, gross	2,455
Buildings and improvements, gross	15,315
Land and improvements and buildings and improvements, gross	17,770
Accumulated depreciation	$ 2,787
Depreciation life	35 years
Rentable square feet | ft²	26,105
6121 W. Sunset Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 11,120
Initial cost, buildings and Improvements	4,256
Costs capitalized subsequent to acquisition/ improvement	43,983
Land and improvements, gross	8,703
Buildings and improvements, gross	50,656
Land and improvements and buildings and improvements, gross	59,359
Accumulated depreciation	$ 8,894
Depreciation life	35 years
Rentable square feet | ft²	91,173
1525 N. Gower Street, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,318
Initial cost, buildings and Improvements	3
Costs capitalized subsequent to acquisition/ improvement	9,641
Land and improvements, gross	1,318
Buildings and improvements, gross	9,645
Land and improvements and buildings and improvements, gross	10,962
Accumulated depreciation	$ 1,542
Depreciation life	35 years
Rentable square feet | ft²	9,610
1575 N. Gower Street, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,153
Initial cost, buildings and Improvements	51
Costs capitalized subsequent to acquisition/ improvement	119,496
Land and improvements, gross	22,153
Buildings and improvements, gross	119,547
Land and improvements and buildings and improvements, gross	141,700
Accumulated depreciation	$ 15,482
Depreciation life	35 years
Rentable square feet | ft²	251,245
1500 N. El Centro Avenue, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,235
Initial cost, buildings and Improvements	21
Costs capitalized subsequent to acquisition/ improvement	58,988
Land and improvements, gross	9,235
Buildings and improvements, gross	59,009
Land and improvements and buildings and improvements, gross	68,244
Accumulated depreciation	$ 12,666
Depreciation life	35 years
Rentable square feet | ft²	104,504
1550 N. El Centro Avenue, Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,970
Initial cost, buildings and Improvements	39
Costs capitalized subsequent to acquisition/ improvement	136,137
Land and improvements, gross	16,970
Buildings and improvements, gross	136,176
Land and improvements and buildings and improvements, gross	153,146
Accumulated depreciation	$ 17,894
Depreciation life	35 years
Rentable square feet | ft²	0
6255 W. Sunset Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,111
Initial cost, buildings and Improvements	60,320
Costs capitalized subsequent to acquisition/ improvement	49,265
Land and improvements, gross	18,111
Buildings and improvements, gross	109,585
Land and improvements and buildings and improvements, gross	127,696
Accumulated depreciation	$ 41,735
Depreciation life	35 years
Rentable square feet | ft²	323,920
3750 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	1,941
Costs capitalized subsequent to acquisition/ improvement	13,113
Land and improvements, gross	0
Buildings and improvements, gross	15,054
Land and improvements and buildings and improvements, gross	15,054
Accumulated depreciation	$ 11,247
Depreciation life	35 years
Rentable square feet | ft²	10,718
3760 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	17,467
Costs capitalized subsequent to acquisition/ improvement	16,687
Land and improvements, gross	0
Buildings and improvements, gross	34,154
Land and improvements and buildings and improvements, gross	34,154
Accumulated depreciation	$ 28,166
Depreciation life	35 years
Rentable square feet | ft²	166,761
3780 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	22,319
Costs capitalized subsequent to acquisition/ improvement	31,855
Land and improvements, gross	0
Buildings and improvements, gross	54,174
Land and improvements and buildings and improvements, gross	54,174
Accumulated depreciation	$ 41,573
Depreciation life	35 years
Rentable square feet | ft²	221,452
3800 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	19,408
Costs capitalized subsequent to acquisition/ improvement	22,252
Land and improvements, gross	0
Buildings and improvements, gross	41,660
Land and improvements and buildings and improvements, gross	41,660
Accumulated depreciation	$ 26,473
Depreciation life	35 years
Rentable square feet | ft²	192,476
3840 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	13,586
Costs capitalized subsequent to acquisition/ improvement	11,755
Land and improvements, gross	0
Buildings and improvements, gross	25,341
Land and improvements and buildings and improvements, gross	25,341
Accumulated depreciation	$ 16,793
Depreciation life	35 years
Rentable square feet | ft²	136,026
3880 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	9,704
Costs capitalized subsequent to acquisition/ improvement	11,827
Land and improvements, gross	0
Buildings and improvements, gross	21,531
Land and improvements and buildings and improvements, gross	21,531
Accumulated depreciation	$ 5,220
Depreciation life	35 years
Rentable square feet | ft²	96,923
3900 Kilroy Airport Way, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	12,615
Costs capitalized subsequent to acquisition/ improvement	13,208
Land and improvements, gross	0
Buildings and improvements, gross	25,823
Land and improvements and buildings and improvements, gross	25,823
Accumulated depreciation	$ 19,261
Depreciation life	35 years
Rentable square feet | ft²	130,935
Kilroy Airport Center, Phase IV, Long Beach, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	4,997
Land and improvements, gross	0
Buildings and improvements, gross	4,997
Land and improvements and buildings and improvements, gross	4,997
Accumulated depreciation	$ 4,997
Depreciation life	35 years
Rentable square feet | ft²	0
8560 W. Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,720
Initial cost, buildings and Improvements	50,956
Costs capitalized subsequent to acquisition/ improvement	1,930
Land and improvements, gross	9,720
Buildings and improvements, gross	52,886
Land and improvements and buildings and improvements, gross	62,606
Accumulated depreciation	$ 8,351
Depreciation life	35 years
Rentable square feet | ft²	74,842
8570 W. Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 31,693
Initial cost, buildings and Improvements	27,974
Costs capitalized subsequent to acquisition/ improvement	6,497
Land and improvements, gross	31,693
Buildings and improvements, gross	34,471
Land and improvements and buildings and improvements, gross	66,163
Accumulated depreciation	$ 4,121
Depreciation life	35 years
Rentable square feet | ft²	45,941
8580 W. Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,013
Initial cost, buildings and Improvements	3,695
Costs capitalized subsequent to acquisition/ improvement	1,219
Land and improvements, gross	10,013
Buildings and improvements, gross	4,914
Land and improvements and buildings and improvements, gross	14,927
Accumulated depreciation	$ 523
Depreciation life	35 years
Rentable square feet | ft²	7,126
8590 W. Sunset Blvd, West Hollywood, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 39,954
Initial cost, buildings and Improvements	27,884
Costs capitalized subsequent to acquisition/ improvement	5,487
Land and improvements, gross	39,954
Buildings and improvements, gross	33,371
Land and improvements and buildings and improvements, gross	73,325
Accumulated depreciation	$ 4,473
Depreciation life	35 years
Rentable square feet | ft²	55,302
12100 W. Olympic Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 352
Initial cost, buildings and Improvements	45,611
Costs capitalized subsequent to acquisition/ improvement	20,191
Land and improvements, gross	9,633
Buildings and improvements, gross	56,520
Land and improvements and buildings and improvements, gross	66,154
Accumulated depreciation	$ 30,836
Depreciation life	35 years
Rentable square feet | ft²	152,048
12200 W. Olympic Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,329
Initial cost, buildings and Improvements	35,488
Costs capitalized subsequent to acquisition/ improvement	25,506
Land and improvements, gross	3,977
Buildings and improvements, gross	61,346
Land and improvements and buildings and improvements, gross	65,323
Accumulated depreciation	$ 42,135
Depreciation life	35 years
Rentable square feet | ft²	150,832
12233 Olympic Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,100
Initial cost, buildings and Improvements	53,170
Costs capitalized subsequent to acquisition/ improvement	5,258
Land and improvements, gross	22,100
Buildings and improvements, gross	58,428
Land and improvements and buildings and improvements, gross	80,528
Accumulated depreciation	$ 16,326
Depreciation life	35 years
Rentable square feet | ft²	151,029
12312 W. Olympic Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,325
Initial cost, buildings and Improvements	12,202
Costs capitalized subsequent to acquisition/ improvement	12,345
Land and improvements, gross	3,399
Buildings and improvements, gross	24,473
Land and improvements and buildings and improvements, gross	27,872
Accumulated depreciation	$ 14,923
Depreciation life	35 years
Rentable square feet | ft²	76,644
1633 26th St., Santa Monica, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,080
Initial cost, buildings and Improvements	6,672
Costs capitalized subsequent to acquisition/ improvement	4,006
Land and improvements, gross	2,040
Buildings and improvements, gross	10,718
Land and improvements and buildings and improvements, gross	12,758
Accumulated depreciation	$ 7,497
Depreciation life	35 years
Rentable square feet | ft²	43,857
2100/2110 Colorado Ave., Santa Monica, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,474
Initial cost, buildings and Improvements	26,087
Costs capitalized subsequent to acquisition/ improvement	14,915
Land and improvements, gross	5,476
Buildings and improvements, gross	41,000
Land and improvements and buildings and improvements, gross	46,476
Accumulated depreciation	$ 27,393
Depreciation life	35 years
Rentable square feet | ft²	102,864
3130 Wilshire Blvd., Santa Monica, [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 8,921
Initial cost, buildings and Improvements	6,579
Costs capitalized subsequent to acquisition/ improvement	17,147
Land and improvements, gross	9,188
Buildings and improvements, gross	23,459
Land and improvements and buildings and improvements, gross	32,647
Accumulated depreciation	$ 17,318
Depreciation life	35 years
Rentable square feet | ft²	90,074
501 Santa Monica Blvd., Santa Monica, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,547
Initial cost, buildings and Improvements	12,044
Costs capitalized subsequent to acquisition/ improvement	16,304
Land and improvements, gross	4,551
Buildings and improvements, gross	28,344
Land and improvements and buildings and improvements, gross	32,895
Accumulated depreciation	$ 19,067
Depreciation life	35 years
Rentable square feet | ft²	76,803
12225 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,700
Initial cost, buildings and Improvements	9,633
Costs capitalized subsequent to acquisition/ improvement	3,864
Land and improvements, gross	1,673
Buildings and improvements, gross	13,524
Land and improvements and buildings and improvements, gross	15,197
Accumulated depreciation	$ 9,622
Depreciation life	35 years
Rentable square feet | ft²	58,401
12235 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,507
Initial cost, buildings and Improvements	8,543
Costs capitalized subsequent to acquisition/ improvement	9,255
Land and improvements, gross	1,540
Buildings and improvements, gross	17,765
Land and improvements and buildings and improvements, gross	19,305
Accumulated depreciation	$ 11,193
Depreciation life	35 years
Rentable square feet | ft²	53,751
12340 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,201
Initial cost, buildings and Improvements	13,896
Costs capitalized subsequent to acquisition/ improvement	12,195
Land and improvements, gross	4,201
Buildings and improvements, gross	26,091
Land and improvements and buildings and improvements, gross	30,292
Accumulated depreciation	$ 13,226
Depreciation life	35 years
Rentable square feet | ft²	89,272
12390 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,453
Initial cost, buildings and Improvements	11,981
Costs capitalized subsequent to acquisition/ improvement	9,541
Land and improvements, gross	3,453
Buildings and improvements, gross	21,522
Land and improvements and buildings and improvements, gross	24,975
Accumulated depreciation	$ 10,742
Depreciation life	35 years
Rentable square feet | ft²	70,140
12348 High Bluff Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,629
Initial cost, buildings and Improvements	3,096
Costs capitalized subsequent to acquisition/ improvement	6,890
Land and improvements, gross	1,629
Buildings and improvements, gross	9,986
Land and improvements and buildings and improvements, gross	11,615
Accumulated depreciation	$ 6,963
Depreciation life	35 years
Rentable square feet | ft²	39,193
12400 High Bluff Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 15,167
Initial cost, buildings and Improvements	40,497
Costs capitalized subsequent to acquisition/ improvement	16,850
Land and improvements, gross	15,167
Buildings and improvements, gross	57,347
Land and improvements and buildings and improvements, gross	72,514
Accumulated depreciation	$ 30,685
Depreciation life	35 years
Rentable square feet | ft²	210,732
12770 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 9,360
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	34,212
Land and improvements, gross	9,360
Buildings and improvements, gross	34,212
Land and improvements and buildings and improvements, gross	43,572
Accumulated depreciation	$ 4,493
Depreciation life	35 years
Rentable square feet | ft²	73,032
12780 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,398
Initial cost, buildings and Improvements	54,954
Costs capitalized subsequent to acquisition/ improvement	22,922
Land and improvements, gross	18,398
Buildings and improvements, gross	77,876
Land and improvements and buildings and improvements, gross	96,274
Accumulated depreciation	$ 18,909
Depreciation life	35 years
Rentable square feet | ft²	140,591
12790 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,252
Initial cost, buildings and Improvements	21,236
Costs capitalized subsequent to acquisition/ improvement	8,485
Land and improvements, gross	10,252
Buildings and improvements, gross	29,721
Land and improvements and buildings and improvements, gross	39,973
Accumulated depreciation	$ 6,812
Depreciation life	35 years
Rentable square feet | ft²	78,836
12860 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	60,675
Land and improvements, gross	11,326
Buildings and improvements, gross	49,349
Land and improvements and buildings and improvements, gross	60,675
Accumulated depreciation	$ 602
Depreciation life	35 years
Rentable square feet | ft²	0
12830 El Camino Real, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	134,776
Land and improvements, gross	28,645
Buildings and improvements, gross	106,131
Land and improvements and buildings and improvements, gross	134,776
Accumulated depreciation	$ 885
Depreciation life	35 years
Rentable square feet | ft²	0
3579 Valley Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 2,167
Initial cost, buildings and Improvements	6,897
Costs capitalized subsequent to acquisition/ improvement	9,559
Land and improvements, gross	2,858
Buildings and improvements, gross	15,765
Land and improvements and buildings and improvements, gross	18,623
Accumulated depreciation	$ 10,397
Depreciation life	35 years
Rentable square feet | ft²	54,960
3611 Valley Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,184
Initial cost, buildings and Improvements	19,352
Costs capitalized subsequent to acquisition/ improvement	25,934
Land and improvements, gross	5,259
Buildings and improvements, gross	44,212
Land and improvements and buildings and improvements, gross	49,470
Accumulated depreciation	$ 27,028
Depreciation life	35 years
Rentable square feet | ft²	130,109
3661 Valley Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,038
Initial cost, buildings and Improvements	21,144
Costs capitalized subsequent to acquisition/ improvement	18,897
Land and improvements, gross	4,725
Buildings and improvements, gross	39,354
Land and improvements and buildings and improvements, gross	44,079
Accumulated depreciation	$ 24,083
Depreciation life	35 years
Rentable square feet | ft²	128,364
3721 Valley Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,297
Initial cost, buildings and Improvements	18,967
Costs capitalized subsequent to acquisition/ improvement	14,973
Land and improvements, gross	4,254
Buildings and improvements, gross	33,983
Land and improvements and buildings and improvements, gross	38,237
Accumulated depreciation	$ 19,134
Depreciation life	35 years
Rentable square feet | ft²	115,193
3811 Valley Centre Dr., Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,452
Initial cost, buildings and Improvements	16,152
Costs capitalized subsequent to acquisition/ improvement	20,540
Land and improvements, gross	4,457
Buildings and improvements, gross	35,687
Land and improvements and buildings and improvements, gross	40,144
Accumulated depreciation	$ 24,154
Depreciation life	35 years
Rentable square feet | ft²	112,067
3745 Paseo Place, Del Mar, CA (Retail) [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 24,358
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	72,290
Land and improvements, gross	24,358
Buildings and improvements, gross	72,290
Land and improvements and buildings and improvements, gross	96,648
Accumulated depreciation	$ 4,435
Depreciation life	35 years
Rentable square feet | ft²	95,871
13280 Evening Creek Dr. South, I-15 Corridor, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 3,701
Initial cost, buildings and Improvements	8,398
Costs capitalized subsequent to acquisition/ improvement	4,818
Land and improvements, gross	3,701
Buildings and improvements, gross	13,216
Land and improvements and buildings and improvements, gross	16,917
Accumulated depreciation	$ 6,354
Depreciation life	35 years
Rentable square feet | ft²	41,196
13290 Evening Creek Dr. South, I-15 Corridor, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,229
Initial cost, buildings and Improvements	11,871
Costs capitalized subsequent to acquisition/ improvement	6,150
Land and improvements, gross	5,229
Buildings and improvements, gross	18,021
Land and improvements and buildings and improvements, gross	23,250
Accumulated depreciation	$ 7,665
Depreciation life	35 years
Rentable square feet | ft²	61,180
13480 Evening Creek Dr. South, I-15 Corridor, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,997
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	52,581
Land and improvements, gross	7,997
Buildings and improvements, gross	52,581
Land and improvements and buildings and improvements, gross	60,578
Accumulated depreciation	$ 21,940
Depreciation life	35 years
Rentable square feet | ft²	154,157
13500 Evening Creek Dr. South, I-15 Corridor, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,581
Initial cost, buildings and Improvements	35,903
Costs capitalized subsequent to acquisition/ improvement	23,609
Land and improvements, gross	7,580
Buildings and improvements, gross	59,513
Land and improvements and buildings and improvements, gross	67,093
Accumulated depreciation	$ 24,861
Depreciation life	35 years
Rentable square feet | ft²	137,658
13520 Evening Creek Dr. South, I-15 Corridor, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,581
Initial cost, buildings and Improvements	35,903
Costs capitalized subsequent to acquisition/ improvement	19,454
Land and improvements, gross	7,580
Buildings and improvements, gross	55,358
Land and improvements and buildings and improvements, gross	62,938
Accumulated depreciation	$ 27,289
Depreciation life	35 years
Rentable square feet | ft²	146,701
2305 Historic Decatur Rd., Point Loma, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,240
Initial cost, buildings and Improvements	22,220
Costs capitalized subsequent to acquisition/ improvement	7,650
Land and improvements, gross	5,240
Buildings and improvements, gross	29,870
Land and improvements and buildings and improvements, gross	35,110
Accumulated depreciation	$ 12,291
Depreciation life	35 years
Rentable square feet | ft²	107,456
4690 Executive Dr., University Towne Centre, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 1,623
Initial cost, buildings and Improvements	7,926
Costs capitalized subsequent to acquisition/ improvement	3,725
Land and improvements, gross	1,623
Buildings and improvements, gross	11,651
Land and improvements and buildings and improvements, gross	13,274
Accumulated depreciation	$ 8,314
Depreciation life	35 years
Rentable square feet | ft²	47,846
Bohannon Drive 4100, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,835
Initial cost, buildings and Improvements	15,526
Costs capitalized subsequent to acquisition/ improvement	932
Land and improvements, gross	4,860
Buildings and improvements, gross	16,433
Land and improvements and buildings and improvements, gross	21,293
Accumulated depreciation	$ 5,123
Depreciation life	35 years
Rentable square feet | ft²	47,379
Bohannon Drive 4200, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs capitalized subsequent to acquisition/ improvement	3,967
Land and improvements, gross	4,662
Buildings and improvements, gross	19,509
Land and improvements and buildings and improvements, gross	24,171
Accumulated depreciation	$ 6,585
Depreciation life	35 years
Rentable square feet | ft²	45,451
Bohannon Drive 4300, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs capitalized subsequent to acquisition/ improvement	5,373
Land and improvements, gross	6,470
Buildings and improvements, gross	26,387
Land and improvements and buildings and improvements, gross	32,858
Accumulated depreciation	$ 8,557
Depreciation life	35 years
Rentable square feet | ft²	63,079
Bohannon Drive 4400, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs capitalized subsequent to acquisition/ improvement	3,331
Land and improvements, gross	4,939
Buildings and improvements, gross	18,597
Land and improvements and buildings and improvements, gross	23,535
Accumulated depreciation	$ 6,394
Depreciation life	35 years
Rentable square feet | ft²	48,146
Bohannon Drive 4500, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,957
Costs capitalized subsequent to acquisition/ improvement	3,811
Land and improvements, gross	6,470
Buildings and improvements, gross	24,825
Land and improvements and buildings and improvements, gross	31,295
Accumulated depreciation	$ 7,506
Depreciation life	35 years
Rentable square feet | ft²	63,078
Bohannon Drive 4600, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 4,798
Initial cost, buildings and Improvements	15,406
Costs capitalized subsequent to acquisition/ improvement	4,025
Land and improvements, gross	4,939
Buildings and improvements, gross	19,290
Land and improvements and buildings and improvements, gross	24,229
Accumulated depreciation	$ 6,427
Depreciation life	35 years
Rentable square feet | ft²	48,147
Bohannon Drive 4700, Menlo Park, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 6,527
Initial cost, buildings and Improvements	20,958
Costs capitalized subsequent to acquisition/ improvement	1,584
Land and improvements, gross	6,470
Buildings and improvements, gross	22,599
Land and improvements and buildings and improvements, gross	29,069
Accumulated depreciation	$ 7,112
Depreciation life	35 years
Rentable square feet | ft²	63,078
1290-1300 Terra Bella Avenue, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 28,730
Initial cost, buildings and Improvements	27,555
Costs capitalized subsequent to acquisition/ improvement	61
Land and improvements, gross	28,730
Buildings and improvements, gross	27,616
Land and improvements and buildings and improvements, gross	56,346
Accumulated depreciation	$ 5,702
Depreciation life	35 years
Rentable square feet | ft²	114,175
680 E Middlefield Road, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,605
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	56,522
Land and improvements, gross	34,605
Buildings and improvements, gross	56,522
Land and improvements and buildings and improvements, gross	91,127
Accumulated depreciation	$ 11,718
Depreciation life	35 years
Rentable square feet | ft²	170,090
690 E Middlefield Road, Mountain View, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 34,755
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	56,764
Land and improvements, gross	34,755
Buildings and improvements, gross	56,765
Land and improvements and buildings and improvements, gross	91,519
Accumulated depreciation	$ 11,768
Depreciation life	35 years
Rentable square feet | ft²	170,823
1701 Page Mill Rd, Palo Alto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	99,522
Costs capitalized subsequent to acquisition/ improvement	29
Land and improvements, gross	0
Buildings and improvements, gross	99,551
Land and improvements and buildings and improvements, gross	99,551
Accumulated depreciation	$ 12,005
Depreciation life	35 years
Rentable square feet | ft²	128,688
3150 Porter Drive, Palo Alto, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	21,715
Costs capitalized subsequent to acquisition/ improvement	410
Land and improvements, gross	0
Buildings and improvements, gross	22,125
Land and improvements and buildings and improvements, gross	22,125
Accumulated depreciation	$ 3,170
Depreciation life	35 years
Rentable square feet | ft²	36,886
900 Jefferson Ave., Redwood City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 16,668
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	109,377
Land and improvements, gross	18,063
Buildings and improvements, gross	107,982
Land and improvements and buildings and improvements, gross	126,045
Accumulated depreciation	$ 19,674
Depreciation life	35 years
Rentable square feet | ft²	228,505
900 Middlefield Road, Redwood City, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,959
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	50,115
Land and improvements, gross	8,626
Buildings and improvements, gross	49,449
Land and improvements and buildings and improvements, gross	58,074
Accumulated depreciation	$ 8,684
Depreciation life	35 years
Rentable square feet | ft²	118,764
100 Hooper Street, San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 78,564
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	191,895
Land and improvements, gross	85,510
Buildings and improvements, gross	184,949
Land and improvements and buildings and improvements, gross	270,459
Accumulated depreciation	$ 11,632
Depreciation life	35 years
Rentable square feet | ft²	394,340
100 First St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 49,150
Initial cost, buildings and Improvements	131,238
Costs capitalized subsequent to acquisition/ improvement	73,238
Land and improvements, gross	49,150
Buildings and improvements, gross	204,476
Land and improvements and buildings and improvements, gross	253,626
Accumulated depreciation	$ 73,294
Depreciation life	35 years
Rentable square feet | ft²	480,457
201 Third St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 19,260
Initial cost, buildings and Improvements	84,018
Costs capitalized subsequent to acquisition/ improvement	69,158
Land and improvements, gross	19,260
Buildings and improvements, gross	153,176
Land and improvements and buildings and improvements, gross	172,436
Accumulated depreciation	$ 65,165
Depreciation life	35 years
Rentable square feet | ft²	346,538
250 Brannan St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 7,630
Initial cost, buildings and Improvements	22,770
Costs capitalized subsequent to acquisition/ improvement	10,043
Land and improvements, gross	7,630
Buildings and improvements, gross	32,813
Land and improvements and buildings and improvements, gross	40,443
Accumulated depreciation	$ 11,783
Depreciation life	35 years
Rentable square feet | ft²	100,850
301 Brannan St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 5,910
Initial cost, buildings and Improvements	22,450
Costs capitalized subsequent to acquisition/ improvement	7,704
Land and improvements, gross	5,910
Buildings and improvements, gross	30,154
Land and improvements and buildings and improvements, gross	36,064
Accumulated depreciation	$ 11,022
Depreciation life	35 years
Rentable square feet | ft²	82,834
303 Second St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 63,550
Initial cost, buildings and Improvements	154,153
Costs capitalized subsequent to acquisition/ improvement	99,670
Land and improvements, gross	63,550
Buildings and improvements, gross	253,823
Land and improvements and buildings and improvements, gross	317,373
Accumulated depreciation	$ 96,466
Depreciation life	35 years
Rentable square feet | ft²	784,658
333 Brannan St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 18,645
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	80,788
Land and improvements, gross	18,645
Buildings and improvements, gross	80,787
Land and improvements and buildings and improvements, gross	99,433
Accumulated depreciation	$ 11,221
Depreciation life	35 years
Rentable square feet | ft²	185,602
345 Brannan Street, San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 29,405
Initial cost, buildings and Improvements	113,179
Costs capitalized subsequent to acquisition/ improvement	752
Land and improvements, gross	29,403
Buildings and improvements, gross	113,933
Land and improvements and buildings and improvements, gross	143,336
Accumulated depreciation	$ 6,967
Depreciation life	35 years
Rentable square feet | ft²	110,050
350 Mission St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 52,815
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	213,312
Land and improvements, gross	52,815
Buildings and improvements, gross	213,312
Land and improvements and buildings and improvements, gross	266,127
Accumulated depreciation	$ 31,186
Depreciation life	35 years
Rentable square feet | ft²	455,340
360 Third St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	88,235
Costs capitalized subsequent to acquisition/ improvement	121,629
Land and improvements, gross	28,504
Buildings and improvements, gross	181,360
Land and improvements and buildings and improvements, gross	209,864
Accumulated depreciation	$ 53,833
Depreciation life	35 years
Rentable square feet | ft²	429,796
1800 Owens St., San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 95,388
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	437,715
Land and improvements, gross	95,388
Buildings and improvements, gross	437,715
Land and improvements and buildings and improvements, gross	533,103
Accumulated depreciation	$ 20,951
Depreciation life	35 years
Rentable square feet | ft²	750,370
345 Oyster Point Blvd., South San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 13,745
Initial cost, buildings and Improvements	18,575
Costs capitalized subsequent to acquisition/ improvement	0
Land and improvements, gross	13,745
Buildings and improvements, gross	18,576
Land and improvements and buildings and improvements, gross	32,320
Accumulated depreciation	$ 1,723
Depreciation life	35 years
Rentable square feet | ft²	40,410
347 Oyster Point Blvd., South San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,071
Initial cost, buildings and Improvements	18,289
Costs capitalized subsequent to acquisition/ improvement	44
Land and improvements, gross	14,071
Buildings and improvements, gross	18,333
Land and improvements and buildings and improvements, gross	32,404
Accumulated depreciation	$ 1,701
Depreciation life	35 years
Rentable square feet | ft²	39,780
349 Oyster Point Blvd., South San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 23,112
Initial cost, buildings and Improvements	22,601
Costs capitalized subsequent to acquisition/ improvement	324
Land and improvements, gross	23,112
Buildings and improvements, gross	22,925
Land and improvements and buildings and improvements, gross	46,037
Accumulated depreciation	$ 2,968
Depreciation life	35 years
Rentable square feet | ft²	65,340
Kilroy Oyster Point, Phase I, South San Francisco, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	620
Land and improvements, gross	0
Buildings and improvements, gross	620
Land and improvements and buildings and improvements, gross	620
Accumulated depreciation	$ 0
Depreciation life	35 years
Rentable square feet | ft²	0
505 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 37,843
Initial cost, buildings and Improvements	1,163
Costs capitalized subsequent to acquisition/ improvement	50,450
Land and improvements, gross	37,943
Buildings and improvements, gross	51,513
Land and improvements and buildings and improvements, gross	89,456
Accumulated depreciation	$ 9,267
Depreciation life	35 years
Rentable square feet | ft²	212,322
555 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 37,843
Initial cost, buildings and Improvements	1,163
Costs capitalized subsequent to acquisition/ improvement	50,447
Land and improvements, gross	37,943
Buildings and improvements, gross	51,510
Land and improvements and buildings and improvements, gross	89,453
Accumulated depreciation	$ 9,267
Depreciation life	35 years
Rentable square feet | ft²	212,322
599 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 13,538
Initial cost, buildings and Improvements	12,559
Costs capitalized subsequent to acquisition/ improvement	63
Land and improvements, gross	13,538
Buildings and improvements, gross	12,622
Land and improvements and buildings and improvements, gross	26,160
Accumulated depreciation	$ 4,559
Depreciation life	35 years
Rentable square feet | ft²	76,031
605 Mathilda Ave., Sunnyvale, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 29,014
Initial cost, buildings and Improvements	891
Costs capitalized subsequent to acquisition/ improvement	77,282
Land and improvements, gross	29,090
Buildings and improvements, gross	78,096
Land and improvements and buildings and improvements, gross	107,187
Accumulated depreciation	$ 20,542
Depreciation life	35 years
Rentable square feet | ft²	162,785
601 108th Ave., Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	214,095
Costs capitalized subsequent to acquisition/ improvement	40,300
Land and improvements, gross	0
Buildings and improvements, gross	254,395
Land and improvements and buildings and improvements, gross	254,395
Accumulated depreciation	$ 88,958
Depreciation life	35 years
Rentable square feet | ft²	488,470
10900 NE 4th St., Bellevue, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 25,080
Initial cost, buildings and Improvements	150,877
Costs capitalized subsequent to acquisition/ improvement	45,984
Land and improvements, gross	25,080
Buildings and improvements, gross	196,861
Land and improvements and buildings and improvements, gross	221,941
Accumulated depreciation	$ 62,594
Depreciation life	35 years
Rentable square feet | ft²	428,557
837 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	37,404
Costs capitalized subsequent to acquisition/ improvement	6,293
Land and improvements, gross	0
Buildings and improvements, gross	43,697
Land and improvements and buildings and improvements, gross	43,697
Accumulated depreciation	$ 12,787
Depreciation life	35 years
Rentable square feet | ft²	112,487
701 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	48,027
Costs capitalized subsequent to acquisition/ improvement	8,545
Land and improvements, gross	0
Buildings and improvements, gross	56,572
Land and improvements and buildings and improvements, gross	56,572
Accumulated depreciation	$ 18,277
Depreciation life	35 years
Rentable square feet | ft²	141,860
801 N. 34th St., Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	58,537
Costs capitalized subsequent to acquisition/ improvement	20,661
Land and improvements, gross	0
Buildings and improvements, gross	79,198
Land and improvements and buildings and improvements, gross	79,198
Accumulated depreciation	$ 20,013
Depreciation life	35 years
Rentable square feet | ft²	169,412
320 Westlake Avenue North, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 14,710
Initial cost, buildings and Improvements	82,018
Costs capitalized subsequent to acquisition/ improvement	14,453
Land and improvements, gross	14,710
Buildings and improvements, gross	96,471
Land and improvements and buildings and improvements, gross	111,181
Accumulated depreciation	$ 23,304
Depreciation life	35 years
Rentable square feet | ft²	184,644
321 Terry Avenue North, Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 10,430
Initial cost, buildings and Improvements	60,003
Costs capitalized subsequent to acquisition/ improvement	10,366
Land and improvements, gross	10,430
Buildings and improvements, gross	70,369
Land and improvements and buildings and improvements, gross	80,799
Accumulated depreciation	$ 18,091
Depreciation life	35 years
Rentable square feet | ft²	135,755
401 Terry Avenue North, Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 22,500
Initial cost, buildings and Improvements	77,046
Costs capitalized subsequent to acquisition/ improvement	13
Land and improvements, gross	22,500
Buildings and improvements, gross	77,059
Land and improvements and buildings and improvements, gross	99,559
Accumulated depreciation	$ 18,225
Depreciation life	35 years
Rentable square feet | ft²	140,605
333 Dexter Ave. North, South Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 0
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	323,433
Land and improvements, gross	42,853
Buildings and improvements, gross	280,580
Land and improvements and buildings and improvements, gross	323,433
Accumulated depreciation	$ 2,592
Depreciation life	35 years
Rentable square feet | ft²	0
3200 Paseo Village Way, Del Mar, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, land and improvements	$ 106,419
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	272,457
Land and improvements, gross	106,419
Buildings and improvements, gross	272,457
Land and improvements and buildings and improvements, gross	378,876
Accumulated depreciation	$ 7,316
Depreciation life	35 years
Rentable square feet | ft²	0
Operating Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 254,365
Initial cost, land and improvements	1,496,855
Initial cost, buildings and Improvements	2,699,959
Costs capitalized subsequent to acquisition/ improvement	4,215,126
Land and improvements, gross	1,628,848
Buildings and improvements, gross	6,783,092
Land and improvements and buildings and improvements, gross	8,411,940
Accumulated depreciation	$ 1,798,646
Rentable square feet | ft²	14,620,166
Office Building [Member] | W. Olympic Blvd., Los Angeles, CA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	$ 166,776
Office Building [Member] | 320 Westlake Ave. North, WA and 321 Terry Avenue North, Lake Union, WA [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	87,589
Undeveloped land and construction in progress [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial cost, encumbrances	0
Initial cost, land and improvements	874,773
Initial cost, buildings and Improvements	0
Costs capitalized subsequent to acquisition/ improvement	903,333
Land and improvements, gross	874,773
Buildings and improvements, gross	903,333
Land and improvements and buildings and improvements, gross	1,778,106
Accumulated depreciation	$ 0
Rentable square feet | ft²	0