v3.3.1.900
Schedule III - Real Estate and Accumulated Depreciation (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
ft²
Jun. 30, 2015
USD ($)
Dec. 31, 2014
ft²
Jan. 31, 2014
ft²
Dec. 31, 2013
USD ($)
ft²
Dec. 31, 2012
USD ($)
Dec. 31, 2010
USD ($)
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Accumulated Depreciation   $ 994,241     $ 947,664 $ 818,957 $ 756,515
Net Rentable Area | ft² 1,046,394   1,471,319 79,000 200,306    
Office Building [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 373,886            
Real Estate and Accumulated Depreciation, Initial Cost of Land 835,393            
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 2,617,322            
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,514,091            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 875,794            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 4,091,012            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 4,966,806            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 994,241            
Net Rentable Area | ft² 13,032,406            
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 164            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 58,701            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 58,701            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,676            
Net Rentable Area | ft² 169,412            
Office Building [Member] | Westlake Avenue North [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 79,667            
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 1,087            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 14,710            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 83,105            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 97,815            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,236            
Net Rentable Area | ft² 184,643            
Office Building [Member] | Pacific Center Boulevard, Sorrento Mesa, California [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Initial Cost of Land $ 2,693            
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 6,280            
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,220            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,693            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,500            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 13,193            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,615            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 67,995            
Office Building [Member] | Executive Drive, UTC, California [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 2,639            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,623            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,565            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,188            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,992            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 47,846            
Office Building [Member] | Valley Centre Drive, Del Mar, California Two [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 18,405            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,259            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,682            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 41,941            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 19,372            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 130,047            
Office Building [Member] | 23925 Park Sorrento, Calabasas, California [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 3,987            
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 493            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 50            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 2,839            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 2,889            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,587            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 6,416            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 765            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,136            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 24,901            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 13,702            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 6,121            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 845            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,017            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,862            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 12,503            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 108,671            
Office Building [Member] | Townsgate Road, Thousand Oaks, California [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 7,417            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,247            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,419            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,666            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,764            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 81,067            
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 29,448            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,048            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 41,207            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 42,255            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 21,837            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 34,953            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,547            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 64,047            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 66,594            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 46,814            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 36,771            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,547            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 65,112            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 67,659            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,312            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 $ 65,563            
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 42,869            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,577            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 76,911            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 80,488            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 29,058            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 241,607            
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 12,238            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,407            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 46,564            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 47,971            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 18,201            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 128,592            
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 73,250            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,703            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 79,923            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 88,626            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,040            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 82,442            
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 25,503            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,455            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,364            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,819            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 308            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 26,075            
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 10,463            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,404            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,404            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 9,280            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 10,734            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 28,201            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,201            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 21,954            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 17,939            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 40,258            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 40,258            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 32,824            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 17,263            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 36,671            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 36,671            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 20,556            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 9,337            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,923            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,923            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 13,222            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 11,086            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,790            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,790            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,722            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 9,949            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,564            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,564            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 13,958            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 126,840            
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   $ 4,984          
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Office Building [Member] | 12100 W. Olympic Boulevard, Los Angeles, California [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
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 16,258            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,633            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 52,588            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 62,221            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 21,521            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 150,167            
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 17,561            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,977            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 53,401            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 57,378            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 31,401            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 150,117            
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 1,695            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 22,100            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 54,865            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 76,965            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,616            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 11,307            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,399            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 23,435            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,834            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,687            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 76,644            
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 32,840            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 18,111            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 93,160            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 111,271            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 12,693            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 324,617            
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 2,955            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,040            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 9,667            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 11,707            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,996            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 $ 96,354            
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 13,998            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,476            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 40,083            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 45,559            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 18,941            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 11,929            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,188            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,241            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 27,429            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 12,144            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 8,861            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,551            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 20,901            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 25,452            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 11,794            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 73,115            
Office Building [Member] | Michelson Drive 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 4,163            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,319            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 86,999            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 96,318            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 17,512            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,969            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,660            
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 14,302            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,013            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 4,943            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,554            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,439            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,993            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,102            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 54,673            
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 7,981            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,201            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 21,877            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 26,078            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,875            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 1,344            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,453            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,325            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,778            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,920            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 4,686            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,629            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,782            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,411            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,164            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 12,551            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 15,167            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 53,048            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 68,215            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 21,723            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 7,400            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,858            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,606            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,464            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,788            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 50,677            
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 12,448            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,725            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 32,905            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 37,630            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 16,408            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 129,051            
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 12,819            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,254            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 31,829            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 36,083            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 11,283            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 114,780            
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 $ 17,641            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 22,492            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 9,360            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,492            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,852            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² (9)            
Office Building [Member] | El Camino Real, Del Mar, California Five [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 1,623            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 18,398            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 56,577            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 74,975            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,942            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 140,591            
Office Building [Member] | El Camino Real, Del Mar, California Six [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 1,202            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,252            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,438            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 32,690            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,905            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 78,349            
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 4,590            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,701            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 12,988            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 16,689            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,349            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 5,898            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,229            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,769            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,998            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,418            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 48,103            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,997            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 48,103            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 56,100            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 13,230            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 8,540            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,580            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 44,444            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 52,024            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 15,768            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 10,094            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,580            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 45,998            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 53,578            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 17,422            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,085            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,344            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,139            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,483            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,770            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 6,324            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,015            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,925            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,940            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,766            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,386            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,213            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,266            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 14,479            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,688            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 5,240            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,552            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 16,953            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,505            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,410            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 3,278            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,240            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 25,498            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 30,738            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,938            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 103,900            
Office Building [Member] | 4939 Directors Place, Sorrento Mesa, California [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Initial Cost of Land $ 2,225            
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 12,698            
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 4,359            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,198            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,084            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 19,282            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 8,975            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 60,662            
Office Building [Member] | 4955 Directors Place, Sorrento Mesa, California [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Initial Cost of Land $ 2,521            
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 14,122            
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 3,697            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,179            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,161            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,340            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 12,998            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 76,246            
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 $ 128,315            
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 42,562            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 63,550            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 196,715            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 260,265            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 41,552            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 25,717            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 49,150            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 156,955            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 206,105            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 32,069            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 4,324            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 7,630            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 27,094            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 34,724            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,001            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 32,926            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 19,260            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 116,944            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 136,204            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 23,292            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 1,843            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,910            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 24,293            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 30,203            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,066            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 111,085            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 28,504            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 170,816            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 199,320            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 17,936            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 429,796            
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 87            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 16,700            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 11,107            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 27,807            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 572            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 235            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 12,260            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,165            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,425            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 534            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 91            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 17,360            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 10,811            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,171            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 723            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 63            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 12,610            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,223            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,833            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 551            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 50,847            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 37,943            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 51,910            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 89,853            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,966            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 50,560            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 37,943            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 51,623            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 89,566            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,966            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 76,844            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 29,090            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 77,659            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 106,749            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,354            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 $ 1,778            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 30,538            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 244,633            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 244,633            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 42,168            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 20,089            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 25,080            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 170,966            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 196,046            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 23,731            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 416,755            
Office Building [Member] | 10210 NE Points Dr., Kirkland, Washington [Member] [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 2,659            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,336            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 26,846            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 31,182            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,022            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 84,641            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California One [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 $ 5,787            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 68,400            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California Two [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 (781)            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,671            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,378            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 9,049            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,033            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 59,630            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California Three [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 1,316            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 1,222            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 7,193            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 8,415            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,874            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 43,645            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California Four [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 21,885            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,926            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 29,864            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 32,790            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 16,673            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 75,899            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California Five [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 $ 4,346            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 48,709            
Office Building [Member] | Pacific Center Court, Sorrento Mesa, California Six [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 (2,250)            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 3,780            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 8,715            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 12,495            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 4,532            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 90,000            
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 468            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,835            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 15,994            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,829            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,156            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,125            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,798            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,531            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,329            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,406            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,803            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,527            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 23,761            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 30,288            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,828            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,125            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,798            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,531            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,329            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,637            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 1,692            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,527            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,649            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 29,176            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,090            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 2,180            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 4,798            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 17,586            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 22,384            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,426            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 1,468            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 6,527            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 22,426            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 28,953            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,000            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 63,078            
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 7,887            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 18,396            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 25,599            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 43,995            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 1,972            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 $ 2,194            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 $ 2,203            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 170,823            
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 46,065            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 8,626            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 45,398            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 54,024            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 277            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 113,790            
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 109,303            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 18,063            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 107,908            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 125,971            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 858            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 226,197            
Office Building [Member] | NE Points Drive, Kirkland, Washington One [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 1,040            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,554            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 13,120            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 15,674            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 2,414            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 49,851            
Office Building [Member] | NE Points Drive, Kirkland, Washington Two [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 3,671            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 5,070            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 28,366            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 33,436            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,189            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | 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 3,428            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 2,380            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 18,542            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 20,922            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 3,450            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 46,450            
Office Building [Member] | Fremont Lake View Seattle 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 2,541            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 39,945            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 39,945            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 5,397            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 111,580            
Office Building [Member] | Terry Avenue North, Washington Two [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 227            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 10,430            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 60,230            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 70,660            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 6,294            
Net Rentable Area | ft² 135,755            
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 1,393            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 0            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 49,420            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 49,420            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 7,717            
Real Estate and Accumulated Depreciation, Life Used for Depreciation 35 years            
Net Rentable Area | ft² 138,995            
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 $ 4,889            
Net Rentable Area | ft² 140,605            
Undeveloped Land and CIP Properties [Member]              
Real Estate and Accumulated Depreciation [Line Items]              
Real Estate and Accumulated Depreciation, Amount of Encumbrances $ 1,810            
Real Estate and Accumulated Depreciation, Initial Cost of Land 730,351            
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements 111            
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 630,878            
Real Estate and Accumulated Depreciation, Carrying Amount of Land 730,351            
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements 630,989            
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements 1,361,340            
Real Estate and Accumulated Depreciation, Accumulated Depreciation $ 0            
Net Rentable Area | ft² 0