Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation
Amount of encumbrances, net of real estate held-for-sale	$ 682,839
Initial Costs
Land, net of real estate held-for-sale	1,289,371
Buildings & Improvements, net of real estate held-for-sale	4,527,854
Cost Capitalized Subsequent to Acquisition
Improvements, net of real estate held-for-sale	658,905
Carrying Costs	31,354
Gross Carrying Amount
Land, net of real estate held-for-sale	1,289,371
Buildings & All Improvements, net of real estate held-for-sale	5,218,113
Total	6,507,484	$ 5,976,526	$ 2,239,741	$ 2,035,330
Real estate, net of real estate held-for-sale	6,507,484
Accumulated depreciation	(419,368)	(263,859)	(134,657)
Accumulated depreciation, net of real estate held-for-sale	(423,950)	(272,724)	$ (142,561)	$ (116,342)
Notes payable	2,707,839	2,278,445
Real estate, federal income tax basis	$ 6,000,000
Building Improvements
Gross Carrying Amount
Estimated useful life	39 years
Land improvements
Gross Carrying Amount
Estimated useful life	15 years
Unsecured Debt
Gross Carrying Amount
Notes payable	$ 2,025,000	1,555,000
Unsecured Debt | Unsecured Revolving Credit Facility
Gross Carrying Amount
Notes payable	300,000	$ 230,000
Office Building | 875 Howard Street Property
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	18,058
Building & Improvements	41,046
Cost Capitalized Subsequent to Acquisition
Improvements	11,230
Carrying Costs	1,736
Gross Carrying Amount
Land	18,058
Building & Improvements	54,012
Total	72,070
Accumulated depreciation	(14,594)
Office Building | Technicolor Building
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	6,599
Building & Improvements	27,187
Cost Capitalized Subsequent to Acquisition
Improvements	25,032
Carrying Costs	3,088
Gross Carrying Amount
Land	6,599
Building & Improvements	55,307
Total	61,906
Accumulated depreciation	(17,158)
Office Building | Icon & Cue
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	0
Cost Capitalized Subsequent to Acquisition
Improvements	137,937
Carrying Costs	5,320
Gross Carrying Amount
Land	0
Building & Improvements	143,257
Total	143,257
Accumulated depreciation	0
Office Building | Del Amo Office
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	18,000
Cost Capitalized Subsequent to Acquisition
Improvements	2,371
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	20,371
Total	20,371
Accumulated depreciation	(4,020)
Office Building | 9300 Wilshire
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	10,718
Cost Capitalized Subsequent to Acquisition
Improvements	1,293
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	12,011
Total	12,011
Accumulated depreciation	(3,553)
Office Building | 1455 Market
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	41,226
Building & Improvements	34,990
Cost Capitalized Subsequent to Acquisition
Improvements	52,242
Carrying Costs	0
Gross Carrying Amount
Land	41,226
Building & Improvements	87,232
Total	128,458
Accumulated depreciation	(9,112)
Office Building | Rincon Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	100,409
Initial Costs
Land	58,251
Building & Improvements	110,656
Cost Capitalized Subsequent to Acquisition
Improvements	18,871
Carrying Costs	0
Gross Carrying Amount
Land	58,251
Building & Improvements	129,527
Total	187,778
Accumulated depreciation	(23,533)
Office Building | 10950 Washington
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	27,929
Initial Costs
Land	17,979
Building & Improvements	25,110
Cost Capitalized Subsequent to Acquisition
Improvements	608
Carrying Costs	0
Gross Carrying Amount
Land	17,979
Building & Improvements	25,718
Total	43,697
Accumulated depreciation	(4,688)
Office Building | 604 Arizona
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	5,620
Building & Improvements	14,745
Cost Capitalized Subsequent to Acquisition
Improvements	1,522
Carrying Costs	0
Gross Carrying Amount
Land	5,620
Building & Improvements	16,267
Total	21,887
Accumulated depreciation	(2,440)
Office Building | 275 Brannan Street
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	4,187
Building & Improvements	8,063
Cost Capitalized Subsequent to Acquisition
Improvements	14,029
Carrying Costs	1,115
Gross Carrying Amount
Land	4,187
Building & Improvements	23,207
Total	27,394
Accumulated depreciation	(4,772)
Office Building | 625 Second Street
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	10,744
Building & Improvements	42,650
Cost Capitalized Subsequent to Acquisition
Improvements	3,159
Carrying Costs	0
Gross Carrying Amount
Land	10,744
Building & Improvements	45,809
Total	56,553
Accumulated depreciation	(7,207)
Office Building | 6922 Hollywood
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	16,608
Building & Improvements	72,392
Cost Capitalized Subsequent to Acquisition
Improvements	5,573
Carrying Costs	0
Gross Carrying Amount
Land	16,608
Building & Improvements	77,965
Total	94,573
Accumulated depreciation	(12,391)
Office Building | 10900 Washington
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	1,400
Building & Improvements	1,200
Cost Capitalized Subsequent to Acquisition
Improvements	738
Carrying Costs	0
Gross Carrying Amount
Land	1,400
Building & Improvements	1,938
Total	3,338
Accumulated depreciation	(510)
Office Building | 901 Market Street
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	17,882
Building & Improvements	79,305
Cost Capitalized Subsequent to Acquisition
Improvements	16,285
Carrying Costs	0
Gross Carrying Amount
Land	17,882
Building & Improvements	95,590
Total	113,472
Accumulated depreciation	(13,465)
Office Building | Element LA
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	168,000
Initial Costs
Land	79,769
Building & Improvements	19,755
Cost Capitalized Subsequent to Acquisition
Improvements	85,152
Carrying Costs	10,391
Gross Carrying Amount
Land	79,769
Building & Improvements	115,298
Total	195,067
Accumulated depreciation	(6,458)
Office Building | Pinnacle I
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	129,000
Initial Costs
Land	28,518
Building & Improvements	171,657
Cost Capitalized Subsequent to Acquisition
Improvements	10,157
Carrying Costs	0
Gross Carrying Amount
Land	28,518
Building & Improvements	181,814
Total	210,332
Accumulated depreciation	(20,168)
Office Building | 3401 Exposition
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	14,120
Building & Improvements	11,319
Cost Capitalized Subsequent to Acquisition
Improvements	11,409
Carrying Costs	1,028
Gross Carrying Amount
Land	14,120
Building & Improvements	23,756
Total	37,876
Accumulated depreciation	(1,920)
Office Building | Pinnacle II
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	87,000
Initial Costs
Land	15,430
Building & Improvements	115,537
Cost Capitalized Subsequent to Acquisition
Improvements	334
Carrying Costs	0
Gross Carrying Amount
Land	15,430
Building & Improvements	115,871
Total	131,301
Accumulated depreciation	(12,019)
Office Building | First and King
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	35,899
Building & Improvements	184,437
Cost Capitalized Subsequent to Acquisition
Improvements	7,349
Carrying Costs	0
Gross Carrying Amount
Land	35,899
Building & Improvements	191,786
Total	227,685
Accumulated depreciation	(19,865)
Office Building | Met Park North
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	64,500
Initial Costs
Land	28,996
Building & Improvements	71,768
Cost Capitalized Subsequent to Acquisition
Improvements	573
Carrying Costs	0
Gross Carrying Amount
Land	28,996
Building & Improvements	72,341
Total	101,337
Accumulated depreciation	(7,678)
Office Building | Northview Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	4,803
Building & Improvements	41,191
Cost Capitalized Subsequent to Acquisition
Improvements	(60)
Carrying Costs	0
Gross Carrying Amount
Land	4,803
Building & Improvements	41,131
Total	45,934
Accumulated depreciation	(4,516)
Office Building | Merrill Place
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	27,684
Building & Improvements	29,824
Cost Capitalized Subsequent to Acquisition
Improvements	8,373
Carrying Costs	379
Gross Carrying Amount
Land	27,684
Building & Improvements	38,576
Total	66,260
Accumulated depreciation	(3,650)
Office Building | Alaskan Way
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	0
Cost Capitalized Subsequent to Acquisition
Improvements	30,725
Carrying Costs	453
Gross Carrying Amount
Land	0
Building & Improvements	31,178
Total	31,178
Accumulated depreciation	0
Office Building | 3402 Pico Blvd.
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	16,410
Building & Improvements	2,136
Cost Capitalized Subsequent to Acquisition
Improvements	8,571
Carrying Costs	2,257
Gross Carrying Amount
Land	16,410
Building & Improvements	12,964
Total	29,374
Accumulated depreciation	0
Office Building | Palo Alto Square
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	326,033
Cost Capitalized Subsequent to Acquisition
Improvements	6,068
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	332,101
Total	332,101
Accumulated depreciation	(21,302)
Office Building | 3400 Hillview
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	159,641
Cost Capitalized Subsequent to Acquisition
Improvements	2,425
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	162,066
Total	162,066
Accumulated depreciation	(12,711)
Office Building | Embarcadero Place
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	41,050
Building & Improvements	77,006
Cost Capitalized Subsequent to Acquisition
Improvements	3,833
Carrying Costs	0
Gross Carrying Amount
Land	41,050
Building & Improvements	80,839
Total	121,889
Accumulated depreciation	(5,095)
Office Building | Foothill Research Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	133,994
Cost Capitalized Subsequent to Acquisition
Improvements	2,803
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	136,797
Total	136,797
Accumulated depreciation	(12,193)
Office Building | Page Mill Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	147,625
Cost Capitalized Subsequent to Acquisition
Improvements	5,245
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	152,870
Total	152,870
Accumulated depreciation	(11,884)
Office Building | Clocktower Square
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	93,949
Cost Capitalized Subsequent to Acquisition
Improvements	267
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	94,216
Total	94,216
Accumulated depreciation	(5,282)
Office Building | Lockheed
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	34,561
Cost Capitalized Subsequent to Acquisition
Improvements	(668)
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	33,893
Total	33,893
Accumulated depreciation	(2,372)
Office Building | 2180 Sand Hill Road
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	13,663
Building & Improvements	50,559
Cost Capitalized Subsequent to Acquisition
Improvements	586
Carrying Costs	0
Gross Carrying Amount
Land	13,663
Building & Improvements	51,145
Total	64,808
Accumulated depreciation	(2,812)
Office Building | Towers at Shore Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	72,673
Building & Improvements	144,188
Cost Capitalized Subsequent to Acquisition
Improvements	6,620
Carrying Costs	0
Gross Carrying Amount
Land	72,673
Building & Improvements	150,808
Total	223,481
Accumulated depreciation	(8,265)
Office Building | Skyway Landing
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	37,959
Building & Improvements	63,559
Cost Capitalized Subsequent to Acquisition
Improvements	1,076
Carrying Costs	0
Gross Carrying Amount
Land	37,959
Building & Improvements	64,635
Total	102,594
Accumulated depreciation	(4,498)
Office Building | Shorebreeze
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	69,448
Building & Improvements	59,806
Cost Capitalized Subsequent to Acquisition
Improvements	3,249
Carrying Costs	0
Gross Carrying Amount
Land	69,448
Building & Improvements	63,055
Total	132,503
Accumulated depreciation	(3,533)
Office Building | 555 Twin Dolphin
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	40,614
Building & Improvements	73,457
Cost Capitalized Subsequent to Acquisition
Improvements	1,933
Carrying Costs	0
Gross Carrying Amount
Land	40,614
Building & Improvements	75,390
Total	116,004
Accumulated depreciation	(4,392)
Office Building | 333 Twin Dolphin
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	36,441
Building & Improvements	64,892
Cost Capitalized Subsequent to Acquisition
Improvements	6,029
Carrying Costs	0
Gross Carrying Amount
Land	36,441
Building & Improvements	70,921
Total	107,362
Accumulated depreciation	(4,201)
Office Building | Peninsula Office Park
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	109,906
Building & Improvements	104,180
Cost Capitalized Subsequent to Acquisition
Improvements	5,787
Carrying Costs	0
Gross Carrying Amount
Land	109,906
Building & Improvements	109,967
Total	219,873
Accumulated depreciation	(8,071)
Office Building | Metro Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	313,683
Cost Capitalized Subsequent to Acquisition
Improvements	19,416
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	333,099
Total	333,099
Accumulated depreciation	(19,182)
Office Building | Concourse
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	45,085
Building & Improvements	224,271
Cost Capitalized Subsequent to Acquisition
Improvements	3,983
Carrying Costs	0
Gross Carrying Amount
Land	45,085
Building & Improvements	228,254
Total	273,339
Accumulated depreciation	(15,496)
Office Building | Gateway
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	33,117
Building & Improvements	121,217
Cost Capitalized Subsequent to Acquisition
Improvements	15,914
Carrying Costs	0
Gross Carrying Amount
Land	33,117
Building & Improvements	137,131
Total	170,248
Accumulated depreciation	(11,496)
Office Building | Metro Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	16,038
Building & Improvements	106,156
Cost Capitalized Subsequent to Acquisition
Improvements	5,610
Carrying Costs	0
Gross Carrying Amount
Land	16,038
Building & Improvements	111,766
Total	127,804
Accumulated depreciation	(7,207)
Office Building | 1740 Technology
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	8,052
Building & Improvements	49,486
Cost Capitalized Subsequent to Acquisition
Improvements	2,235
Carrying Costs	0
Gross Carrying Amount
Land	8,052
Building & Improvements	51,721
Total	59,773
Accumulated depreciation	(4,220)
Office Building | Skyport Plaza
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	29,033
Building & Improvements	153,844
Cost Capitalized Subsequent to Acquisition
Improvements	890
Carrying Costs	0
Gross Carrying Amount
Land	29,033
Building & Improvements	154,734
Total	183,767
Accumulated depreciation	(12,751)
Office Building | Techmart Commerce Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	66,660
Cost Capitalized Subsequent to Acquisition
Improvements	6,505
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	73,165
Total	73,165
Accumulated depreciation	(5,228)
Office Building | Campus Center
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	59,460
Building & Improvements	79,604
Cost Capitalized Subsequent to Acquisition
Improvements	444
Carrying Costs	0
Gross Carrying Amount
Land	59,460
Building & Improvements	80,048
Total	139,508
Accumulated depreciation	(7,249)
Office Building | 4th and Traction
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	12,140
Building & Improvements	37,110
Cost Capitalized Subsequent to Acquisition
Improvements	25,100
Carrying Costs	3,077
Gross Carrying Amount
Land	12,140
Building & Improvements	65,287
Total	77,427
Accumulated depreciation	0
Office Building | 405 Mateo
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	13,040
Building & Improvements	26,960
Cost Capitalized Subsequent to Acquisition
Improvements	3,127
Carrying Costs	1,949
Gross Carrying Amount
Land	13,040
Building & Improvements	32,036
Total	45,076
Accumulated depreciation	0
Office Building | EOP Northern California Portfolio
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	292,382
Cost Capitalized Subsequent to Acquisition
Improvements	2,755
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	295,137
Total	295,137
Accumulated depreciation	(5,271)
Office Building | Hill7 office property
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	101,000
Initial Costs
Land	36,888
Building & Improvements	137,079
Cost Capitalized Subsequent to Acquisition
Improvements	60
Carrying Costs	0
Gross Carrying Amount
Land	36,888
Building & Improvements	137,139
Total	174,027
Accumulated depreciation	(971)
Office Building | Page Mill Hill
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	0
Building & Improvements	131,402
Cost Capitalized Subsequent to Acquisition
Improvements	438
Carrying Costs	0
Gross Carrying Amount
Land	0
Building & Improvements	131,840
Total	131,840
Accumulated depreciation	(188)
Office Building | 222 Kearny Street
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	7,563
Building & Improvements	23,793
Cost Capitalized Subsequent to Acquisition
Improvements	5,827
Carrying Costs	0
Gross Carrying Amount
Land	7,563
Building & Improvements	29,620
Total	37,183
Accumulated depreciation	(4,582)
Media & Entertainment
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	682,839
Initial Costs
Land	1,281,808
Building & Improvements	4,504,061
Cost Capitalized Subsequent to Acquisition
Improvements	653,078
Carrying Costs	31,354
Gross Carrying Amount
Land	1,281,808
Building & Improvements	5,188,493
Total	6,470,301
Accumulated depreciation	(419,368)
Media & Entertainment | Sunset Gower Studios
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	5,001
Initial Costs
Land	79,320
Building & Improvements	64,697
Cost Capitalized Subsequent to Acquisition
Improvements	26,805
Carrying Costs	139
Gross Carrying Amount
Land	79,320
Building & Improvements	91,641
Total	170,961
Accumulated depreciation	(20,387)
Media & Entertainment | Sunset Bronson
SEC Schedule III, Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Costs
Land	77,698
Building & Improvements	32,374
Cost Capitalized Subsequent to Acquisition
Improvements	41,070
Carrying Costs	422
Gross Carrying Amount
Land	77,698
Building & Improvements	73,866
Total	151,564
Accumulated depreciation	$ (9,394)