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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
ft²
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 612,694      
Initial cost, land and improvements 2,565,066      
Initial cost, buildings and Improvements 2,959,869      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,716,713      
Land and improvements, gross 2,656,533      
Buildings and improvements, gross 9,585,115      
Land and improvements and buildings and improvements, gross 12,241,648      
Accumulated Depreciation $ 2,518,304 $ 2,218,710 $ 2,003,656 $ 1,798,646
Rentable square feet (unaudited) | ft² 17,044,128      
3101 - 3243 S. La Cienega Blvd., Culver City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 150,718      
Initial cost, buildings and Improvements 31,033      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,856      
Land and improvements, gross 150,718      
Buildings and improvements, gross 32,889      
Land and improvements and buildings and improvements, gross 183,607      
Accumulated Depreciation $ 20,163      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 166,207      
2240 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,044      
Initial cost, buildings and Improvements 11,763      
Costs Capitalized Subsequent  to Acquisition/ Improvement 29,928      
Land and improvements, gross 1,048      
Buildings and improvements, gross 41,687      
Land and improvements and buildings and improvements, gross 42,735      
Accumulated Depreciation $ 31,759      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 122,870      
2250 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,579      
Initial cost, buildings and Improvements 29,062      
Costs Capitalized Subsequent  to Acquisition/ Improvement 36,750      
Land and improvements, gross 2,547      
Buildings and improvements, gross 65,844      
Land and improvements and buildings and improvements, gross 68,391      
Accumulated Depreciation $ 61,662      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 298,728      
2260 E. Imperial Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,518      
Initial cost, buildings and Improvements 28,370      
Costs Capitalized Subsequent  to Acquisition/ Improvement 37,076      
Land and improvements, gross 2,547      
Buildings and improvements, gross 65,417      
Land and improvements and buildings and improvements, gross 67,964      
Accumulated Depreciation $ 25,231      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 298,728      
909 N. Pacific Coast Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,577      
Initial cost, buildings and Improvements 34,042      
Costs Capitalized Subsequent  to Acquisition/ Improvement 56,012      
Land and improvements, gross 3,565      
Buildings and improvements, gross 90,066      
Land and improvements and buildings and improvements, gross 93,631      
Accumulated Depreciation $ 55,148      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 244,880      
999 N. Pacific Coast Highway, El Segundo, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,407      
Initial cost, buildings and Improvements 34,326      
Costs Capitalized Subsequent  to Acquisition/ Improvement 18,722      
Land and improvements, gross 1,407      
Buildings and improvements, gross 53,048      
Land and improvements and buildings and improvements, gross 54,455      
Accumulated Depreciation $ 33,803      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 138,389      
1350 Ivar Ave., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,575      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 14,193      
Land and improvements, gross 1,575      
Buildings and improvements, gross 14,193      
Land and improvements and buildings and improvements, gross 15,768      
Accumulated Depreciation $ 1,282      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 16,448      
1355 Vine St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 17,588      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 121,115      
Land and improvements, gross 17,588      
Buildings and improvements, gross 121,115      
Land and improvements and buildings and improvements, gross 138,703      
Accumulated Depreciation $ 11,167      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 183,129      
1375 Vine St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 15,578      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 103,942      
Land and improvements, gross 15,578      
Buildings and improvements, gross 103,942      
Land and improvements and buildings and improvements, gross 119,520      
Accumulated Depreciation $ 9,536      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 159,236      
1395 Vine St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 278      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 3,271      
Land and improvements, gross 278      
Buildings and improvements, gross 3,271      
Land and improvements and buildings and improvements, gross 3,549      
Accumulated Depreciation $ 294      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 2,575      
1500 N. El Centro Ave., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,235      
Initial cost, buildings and Improvements 21      
Costs Capitalized Subsequent  to Acquisition/ Improvement 61,932      
Land and improvements, gross 9,235      
Buildings and improvements, gross 61,953      
Land and improvements and buildings and improvements, gross 71,188      
Accumulated Depreciation $ 17,709      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 113,447      
1525 N. Gower St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,318      
Initial cost, buildings and Improvements 3      
Costs Capitalized Subsequent  to Acquisition/ Improvement 9,768      
Land and improvements, gross 1,318      
Buildings and improvements, gross 9,771      
Land and improvements and buildings and improvements, gross 11,089      
Accumulated Depreciation $ 2,570      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 9,610      
1575 N. Gower St., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,153      
Initial cost, buildings and Improvements 51      
Costs Capitalized Subsequent  to Acquisition/ Improvement 119,769      
Land and improvements, gross 22,153      
Buildings and improvements, gross 119,820      
Land and improvements and buildings and improvements, gross 141,973      
Accumulated Depreciation $ 26,547      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 264,430      
6115 W. Sunset Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,313      
Initial cost, buildings and Improvements 3      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,409      
Land and improvements, gross 2,455      
Buildings and improvements, gross 16,270      
Land and improvements and buildings and improvements, gross 18,725      
Accumulated Depreciation $ 5,545      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 26,238      
6121 W. Sunset Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 11,120      
Initial cost, buildings and Improvements 4,256      
Costs Capitalized Subsequent  to Acquisition/ Improvement 44,167      
Land and improvements, gross 8,703      
Buildings and improvements, gross 50,840      
Land and improvements and buildings and improvements, gross 59,543      
Accumulated Depreciation $ 13,304      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 93,418      
6255 W. Sunset Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 18,111      
Initial cost, buildings and Improvements 60,320      
Costs Capitalized Subsequent  to Acquisition/ Improvement 53,475      
Land and improvements, gross 18,111      
Buildings and improvements, gross 113,795      
Land and improvements and buildings and improvements, gross 131,906      
Accumulated Depreciation $ 58,714      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 332,100      
3750 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 1,941      
Costs Capitalized Subsequent  to Acquisition/ Improvement 13,645      
Land and improvements, gross 0      
Buildings and improvements, gross 15,586      
Land and improvements and buildings and improvements, gross 15,586      
Accumulated Depreciation $ 12,686      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 10,718      
3760 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 17,467      
Costs Capitalized Subsequent  to Acquisition/ Improvement 23,013      
Land and improvements, gross 0      
Buildings and improvements, gross 40,480      
Land and improvements and buildings and improvements, gross 40,480      
Accumulated Depreciation $ 32,535      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 166,761      
3780 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 22,319      
Costs Capitalized Subsequent  to Acquisition/ Improvement 39,083      
Land and improvements, gross 0      
Buildings and improvements, gross 61,402      
Land and improvements and buildings and improvements, gross 61,402      
Accumulated Depreciation $ 48,266      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 221,452      
3800 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 19,408      
Costs Capitalized Subsequent  to Acquisition/ Improvement 24,516      
Land and improvements, gross 0      
Buildings and improvements, gross 43,924      
Land and improvements and buildings and improvements, gross 43,924      
Accumulated Depreciation $ 31,475      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 192,476      
3840 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 13,586      
Costs Capitalized Subsequent  to Acquisition/ Improvement 29,143      
Land and improvements, gross 0      
Buildings and improvements, gross 42,729      
Land and improvements and buildings and improvements, gross 42,729      
Accumulated Depreciation $ 19,775      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 138,441      
3880 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 9,704      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,202      
Land and improvements, gross 0      
Buildings and improvements, gross 21,906      
Land and improvements and buildings and improvements, gross 21,906      
Accumulated Depreciation $ 7,278      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 96,923      
3900 Kilroy Airport Way, Long Beach, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 12,615      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,754      
Land and improvements, gross 0      
Buildings and improvements, gross 30,369      
Land and improvements and buildings and improvements, gross 30,369      
Accumulated Depreciation $ 22,085      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 130,935      
8560 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,720      
Initial cost, buildings and Improvements 50,956      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,497      
Land and improvements, gross 9,720      
Buildings and improvements, gross 58,453      
Land and improvements and buildings and improvements, gross 68,173      
Accumulated Depreciation $ 14,898      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 76,558      
8570 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 31,693      
Initial cost, buildings and Improvements 27,974      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,266      
Land and improvements, gross 31,693      
Buildings and improvements, gross 35,240      
Land and improvements and buildings and improvements, gross 66,933      
Accumulated Depreciation $ 8,817      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 49,276      
8580 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,013      
Initial cost, buildings and Improvements 3,695      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,828      
Land and improvements, gross 10,013      
Buildings and improvements, gross 5,523      
Land and improvements and buildings and improvements, gross 15,536      
Accumulated Depreciation $ 1,558      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 6,875      
8590 W. Sunset Blvd., West Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 39,954      
Initial cost, buildings and Improvements 27,884      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,769      
Land and improvements, gross 39,954      
Buildings and improvements, gross 33,653      
Land and improvements and buildings and improvements, gross 73,607      
Accumulated Depreciation $ 8,532      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 56,750      
12100 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 352      
Initial cost, buildings and Improvements 45,611      
Costs Capitalized Subsequent  to Acquisition/ Improvement 26,036      
Land and improvements, gross 9,633      
Buildings and improvements, gross 62,366      
Land and improvements and buildings and improvements, gross 71,999      
Accumulated Depreciation $ 36,818      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 155,679      
12200 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,329      
Initial cost, buildings and Improvements 35,488      
Costs Capitalized Subsequent  to Acquisition/ Improvement 27,917      
Land and improvements, gross 3,977      
Buildings and improvements, gross 63,757      
Land and improvements and buildings and improvements, gross 67,734      
Accumulated Depreciation $ 49,193      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 154,544      
12233 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,100      
Initial cost, buildings and Improvements 53,170      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,909      
Land and improvements, gross 22,100      
Buildings and improvements, gross 60,079      
Land and improvements and buildings and improvements, gross 82,179      
Accumulated Depreciation $ 22,114      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 156,746      
12312 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,325      
Initial cost, buildings and Improvements 12,202      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,671      
Land and improvements, gross 3,399      
Buildings and improvements, gross 24,799      
Land and improvements and buildings and improvements, gross 28,198      
Accumulated Depreciation $ 19,563      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 76,644      
2100/2110 Colorado Ave., Santa Monica, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,474      
Initial cost, buildings and Improvements 26,087      
Costs Capitalized Subsequent  to Acquisition/ Improvement 18,285      
Land and improvements, gross 5,476      
Buildings and improvements, gross 44,370      
Land and improvements and buildings and improvements, gross 49,846      
Accumulated Depreciation $ 31,892      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 104,853      
501 Santa Monica Blvd., Santa Monica, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,547      
Initial cost, buildings and Improvements 12,044      
Costs Capitalized Subsequent  to Acquisition/ Improvement 19,357      
Land and improvements, gross 4,551      
Buildings and improvements, gross 31,397      
Land and improvements and buildings and improvements, gross 35,948      
Accumulated Depreciation $ 23,853      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 78,509      
12225 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,700      
Initial cost, buildings and Improvements 9,633      
Costs Capitalized Subsequent  to Acquisition/ Improvement 4,434      
Land and improvements, gross 1,673      
Buildings and improvements, gross 14,094      
Land and improvements and buildings and improvements, gross 15,767      
Accumulated Depreciation $ 10,912      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 58,401      
12235 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,507      
Initial cost, buildings and Improvements 8,543      
Costs Capitalized Subsequent  to Acquisition/ Improvement 9,985      
Land and improvements, gross 1,540      
Buildings and improvements, gross 18,495      
Land and improvements and buildings and improvements, gross 20,035      
Accumulated Depreciation $ 13,792      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 53,751      
12340 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,201      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 35,629      
Land and improvements, gross 4,201      
Buildings and improvements, gross 35,629      
Land and improvements and buildings and improvements, gross 39,830      
Accumulated Depreciation $ 4,585      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 109,307      
12390 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,453      
Initial cost, buildings and Improvements 11,981      
Costs Capitalized Subsequent  to Acquisition/ Improvement 12,348      
Land and improvements, gross 3,453      
Buildings and improvements, gross 24,329      
Land and improvements and buildings and improvements, gross 27,782      
Accumulated Depreciation $ 14,393      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 73,238      
12770 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 9,360      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 35,029      
Land and improvements, gross 9,360      
Buildings and improvements, gross 35,029      
Land and improvements and buildings and improvements, gross 44,389      
Accumulated Depreciation $ 8,314      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 75,035      
12780 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 18,398      
Initial cost, buildings and Improvements 54,954      
Costs Capitalized Subsequent  to Acquisition/ Improvement 24,127      
Land and improvements, gross 18,398      
Buildings and improvements, gross 79,081      
Land and improvements and buildings and improvements, gross 97,479      
Accumulated Depreciation $ 28,749      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 140,591      
12790 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,252      
Initial cost, buildings and Improvements 21,236      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,031      
Land and improvements, gross 10,252      
Buildings and improvements, gross 38,267      
Land and improvements and buildings and improvements, gross 48,519      
Accumulated Depreciation $ 12,315      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 87,944      
12830 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 28,645      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 113,007      
Land and improvements, gross 28,645      
Buildings and improvements, gross 113,007      
Land and improvements and buildings and improvements, gross 141,652      
Accumulated Depreciation $ 12,713      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 196,444      
12860 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 11,326      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 51,844      
Land and improvements, gross 11,326      
Buildings and improvements, gross 51,844      
Land and improvements and buildings and improvements, gross 63,170      
Accumulated Depreciation $ 6,012      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 92,042      
12348 High Bluff Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,629      
Initial cost, buildings and Improvements 3,096      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,504      
Land and improvements, gross 1,629      
Buildings and improvements, gross 11,600      
Land and improvements and buildings and improvements, gross 13,229      
Accumulated Depreciation $ 8,741      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 39,192      
12400 High Bluff Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 15,167      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 49,456      
Land and improvements, gross 15,167      
Buildings and improvements, gross 49,456      
Land and improvements and buildings and improvements, gross 64,623      
Accumulated Depreciation $ 11,382      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 216,518      
3579 Valley Centre Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,167      
Initial cost, buildings and Improvements 6,897      
Costs Capitalized Subsequent  to Acquisition/ Improvement 11,556      
Land and improvements, gross 2,858      
Buildings and improvements, gross 17,762      
Land and improvements and buildings and improvements, gross 20,620      
Accumulated Depreciation $ 12,032      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 54,960      
3611 Valley Centre Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,184      
Initial cost, buildings and Improvements 19,352      
Costs Capitalized Subsequent  to Acquisition/ Improvement 29,641      
Land and improvements, gross 5,259      
Buildings and improvements, gross 47,918      
Land and improvements and buildings and improvements, gross 53,177      
Accumulated Depreciation $ 33,359      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 132,425      
3661 Valley Centre Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,038      
Initial cost, buildings and Improvements 21,144      
Costs Capitalized Subsequent  to Acquisition/ Improvement 20,770      
Land and improvements, gross 4,725      
Buildings and improvements, gross 41,227      
Land and improvements and buildings and improvements, gross 45,952      
Accumulated Depreciation $ 29,457      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 131,662      
3721 Valley Centre Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,297      
Initial cost, buildings and Improvements 18,967      
Costs Capitalized Subsequent  to Acquisition/ Improvement 17,124      
Land and improvements, gross 4,254      
Buildings and improvements, gross 36,134      
Land and improvements and buildings and improvements, gross 40,388      
Accumulated Depreciation $ 23,912      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 115,193      
3811 Valley Centre Dr., Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,452      
Initial cost, buildings and Improvements 16,152      
Costs Capitalized Subsequent  to Acquisition/ Improvement 21,985      
Land and improvements, gross 4,457      
Buildings and improvements, gross 37,132      
Land and improvements and buildings and improvements, gross 41,589      
Accumulated Depreciation $ 26,896      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 118,912      
3745 Paseo Place, Del Mar, CA (Retail)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 24,358      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 75,649      
Land and improvements, gross 24,358      
Buildings and improvements, gross 75,649      
Land and improvements and buildings and improvements, gross 100,007      
Accumulated Depreciation $ 11,192      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 95,871      
13480 Evening Creek Dr. North, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,997      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 67,178      
Land and improvements, gross 7,997      
Buildings and improvements, gross 67,178      
Land and improvements and buildings and improvements, gross 75,175      
Accumulated Depreciation $ 27,665      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 143,401      
13500 Evening Creek Dr. North, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,581      
Initial cost, buildings and Improvements 35,903      
Costs Capitalized Subsequent  to Acquisition/ Improvement 25,140      
Land and improvements, gross 7,580      
Buildings and improvements, gross 61,044      
Land and improvements and buildings and improvements, gross 68,624      
Accumulated Depreciation $ 34,020      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 143,749      
13520 Evening Creek Dr. North, San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,581      
Initial cost, buildings and Improvements 35,903      
Costs Capitalized Subsequent  to Acquisition/ Improvement 25,728      
Land and improvements, gross 7,580      
Buildings and improvements, gross 61,632      
Land and improvements and buildings and improvements, gross 69,212      
Accumulated Depreciation $ 36,164      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 146,701      
2100 Kettner Blvd., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,861      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 105,759      
Land and improvements, gross 19,861      
Buildings and improvements, gross 105,759      
Land and improvements and buildings and improvements, gross 125,620      
Accumulated Depreciation $ 3,873      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 206,527      
2305 Historic Decatur Rd., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,240      
Initial cost, buildings and Improvements 22,220      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,816      
Land and improvements, gross 5,240      
Buildings and improvements, gross 33,036      
Land and improvements and buildings and improvements, gross 38,276      
Accumulated Depreciation $ 16,858      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 107,456      
4690 Executive Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,880      
Land and improvements, gross 0      
Buildings and improvements, gross 6,880      
Land and improvements and buildings and improvements, gross 6,880      
Accumulated Depreciation $ 408      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
9455 Towne Centre Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,081      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 80,080      
Land and improvements, gross 6,081      
Buildings and improvements, gross 80,080      
Land and improvements and buildings and improvements, gross 86,161      
Accumulated Depreciation $ 7,363      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 160,444      
9514 Towne Centre Dr., San Diego, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,928      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 47,563      
Land and improvements, gross 4,928      
Buildings and improvements, gross 47,563      
Land and improvements and buildings and improvements, gross 52,491      
Accumulated Depreciation $ 685      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 70,616      
4100 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,835      
Initial cost, buildings and Improvements 15,526      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,524      
Land and improvements, gross 4,860      
Buildings and improvements, gross 17,025      
Land and improvements and buildings and improvements, gross 21,885      
Accumulated Depreciation $ 6,650      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 47,643      
4200 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,798      
Initial cost, buildings and Improvements 15,406      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,370      
Land and improvements, gross 4,662      
Buildings and improvements, gross 23,912      
Land and improvements and buildings and improvements, gross 28,574      
Accumulated Depreciation $ 9,495      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 43,600      
4300 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,958      
Costs Capitalized Subsequent  to Acquisition/ Improvement 8,097      
Land and improvements, gross 6,470      
Buildings and improvements, gross 29,112      
Land and improvements and buildings and improvements, gross 35,582      
Accumulated Depreciation $ 11,649      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,430      
4400 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 3,245      
Land and improvements, gross 0      
Buildings and improvements, gross 3,245      
Land and improvements and buildings and improvements, gross 3,245      
Accumulated Depreciation $ 2,117      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
4500 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,957      
Costs Capitalized Subsequent  to Acquisition/ Improvement 4,782      
Land and improvements, gross 6,470      
Buildings and improvements, gross 25,796      
Land and improvements and buildings and improvements, gross 32,266      
Accumulated Depreciation $ 10,623      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,429      
4600 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 4,798      
Initial cost, buildings and Improvements 15,406      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,286      
Land and improvements, gross 4,939      
Buildings and improvements, gross 20,551      
Land and improvements and buildings and improvements, gross 25,490      
Accumulated Depreciation $ 8,884      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 48,413      
4700 Bohannon Dr., Menlo Park, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 6,527      
Initial cost, buildings and Improvements 20,958      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,576      
Land and improvements, gross 6,470      
Buildings and improvements, gross 22,591      
Land and improvements and buildings and improvements, gross 29,061      
Accumulated Depreciation $ 9,106      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 63,429      
1290 - 1300 Terra Bella Ave., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 28,730      
Initial cost, buildings and Improvements 27,555      
Costs Capitalized Subsequent  to Acquisition/ Improvement 13,461      
Land and improvements, gross 28,730      
Buildings and improvements, gross 41,016      
Land and improvements and buildings and improvements, gross 69,746      
Accumulated Depreciation $ 9,462      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 114,175      
680 E. Middlefield Rd., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 34,755      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 56,759      
Land and improvements, gross 34,755      
Buildings and improvements, gross 56,759      
Land and improvements and buildings and improvements, gross 91,514      
Accumulated Depreciation $ 17,536      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 171,676      
690 E. Middlefield Rd., Mountain View, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 34,605      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 56,515      
Land and improvements, gross 34,605      
Buildings and improvements, gross 56,515      
Land and improvements and buildings and improvements, gross 91,120      
Accumulated Depreciation $ 17,461      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 171,215      
1701 Page Mill Rd., Palo Alto, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 99,522      
Costs Capitalized Subsequent  to Acquisition/ Improvement 111      
Land and improvements, gross 0      
Buildings and improvements, gross 99,633      
Land and improvements and buildings and improvements, gross 99,633      
Accumulated Depreciation $ 21,015      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 128,688      
3150 Porter Dr., Palo Alto, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 21,715      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,446      
Land and improvements, gross 0      
Buildings and improvements, gross 28,161      
Land and improvements and buildings and improvements, gross 28,161      
Accumulated Depreciation $ 6,276      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 36,886      
900 Jefferson Ave., Redwood City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 16,668      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 109,612      
Land and improvements, gross 18,063      
Buildings and improvements, gross 108,217      
Land and improvements and buildings and improvements, gross 126,280      
Accumulated Depreciation $ 31,253      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 228,505      
900 Middlefield Rd., Redwood City, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,959      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 50,285      
Land and improvements, gross 8,626      
Buildings and improvements, gross 49,618      
Land and improvements and buildings and improvements, gross 58,244      
Accumulated Depreciation $ 14,031      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 118,764      
100 Hooper St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 78,564      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 197,034      
Land and improvements, gross 85,510      
Buildings and improvements, gross 190,088      
Land and improvements and buildings and improvements, gross 275,598      
Accumulated Depreciation $ 29,788      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 417,914      
100 First St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 49,150      
Initial cost, buildings and Improvements 131,238      
Costs Capitalized Subsequent  to Acquisition/ Improvement 81,437      
Land and improvements, gross 49,150      
Buildings and improvements, gross 212,675      
Land and improvements and buildings and improvements, gross 261,825      
Accumulated Depreciation $ 106,267      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 480,457      
303 Second St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 63,550      
Initial cost, buildings and Improvements 154,153      
Costs Capitalized Subsequent  to Acquisition/ Improvement 116,103      
Land and improvements, gross 63,550      
Buildings and improvements, gross 270,256      
Land and improvements and buildings and improvements, gross 333,806      
Accumulated Depreciation $ 134,337      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 784,658      
201 Third St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,260      
Initial cost, buildings and Improvements 84,018      
Costs Capitalized Subsequent  to Acquisition/ Improvement 78,410      
Land and improvements, gross 19,260      
Buildings and improvements, gross 162,428      
Land and improvements and buildings and improvements, gross 181,688      
Accumulated Depreciation $ 94,189      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 346,538      
360 Third St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 88,235      
Costs Capitalized Subsequent  to Acquisition/ Improvement 127,866      
Land and improvements, gross 28,504      
Buildings and improvements, gross 187,597      
Land and improvements and buildings and improvements, gross 216,101      
Accumulated Depreciation $ 74,839      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 436,357      
250 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 7,630      
Initial cost, buildings and Improvements 22,770      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,773      
Land and improvements, gross 7,630      
Buildings and improvements, gross 33,543      
Land and improvements and buildings and improvements, gross 41,173      
Accumulated Depreciation $ 15,259      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 100,850      
301 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 5,910      
Initial cost, buildings and Improvements 22,450      
Costs Capitalized Subsequent  to Acquisition/ Improvement 16,987      
Land and improvements, gross 5,910      
Buildings and improvements, gross 39,437      
Land and improvements and buildings and improvements, gross 45,347      
Accumulated Depreciation $ 15,826      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 82,834      
333 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 18,645      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 80,643      
Land and improvements, gross 18,645      
Buildings and improvements, gross 80,643      
Land and improvements and buildings and improvements, gross 99,288      
Accumulated Depreciation $ 18,703      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 185,602      
345 Brannan St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 29,405      
Initial cost, buildings and Improvements 113,179      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,260      
Land and improvements, gross 29,403      
Buildings and improvements, gross 114,441      
Land and improvements and buildings and improvements, gross 143,844      
Accumulated Depreciation $ 16,912      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 110,050      
350 Mission St., San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 52,815      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 212,738      
Land and improvements, gross 52,815      
Buildings and improvements, gross 212,738      
Land and improvements and buildings and improvements, gross 265,553      
Accumulated Depreciation $ 51,190      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 455,340      
345 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 13,745      
Initial cost, buildings and Improvements 18,575      
Costs Capitalized Subsequent  to Acquisition/ Improvement 0      
Land and improvements, gross 13,745      
Buildings and improvements, gross 18,575      
Land and improvements and buildings and improvements, gross 32,320      
Accumulated Depreciation $ 3,392      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 40,410      
347 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 14,071      
Initial cost, buildings and Improvements 18,289      
Costs Capitalized Subsequent  to Acquisition/ Improvement 44      
Land and improvements, gross 14,071      
Buildings and improvements, gross 18,333      
Land and improvements and buildings and improvements, gross 32,404      
Accumulated Depreciation $ 3,354      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 39,780      
349 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,112      
Initial cost, buildings and Improvements 22,601      
Costs Capitalized Subsequent  to Acquisition/ Improvement 352      
Land and improvements, gross 23,112      
Buildings and improvements, gross 22,953      
Land and improvements and buildings and improvements, gross 46,065      
Accumulated Depreciation $ 5,440      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 65,340      
350 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,719      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 177,245      
Land and improvements, gross 23,719      
Buildings and improvements, gross 177,245      
Land and improvements and buildings and improvements, gross 200,964      
Accumulated Depreciation $ 11,889      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 234,892      
352 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 23,449      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 165,720      
Land and improvements, gross 23,449      
Buildings and improvements, gross 165,720      
Land and improvements and buildings and improvements, gross 189,169      
Accumulated Depreciation $ 11,662      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 232,215      
354 Oyster Point Blvd., South San Francisco, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 19,538      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 141,126      
Land and improvements, gross 19,538      
Buildings and improvements, gross 141,126      
Land and improvements and buildings and improvements, gross 160,664      
Accumulated Depreciation $ 11,708      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 193,472      
505 Mathilda Ave., Sunnyvale, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 37,843      
Initial cost, buildings and Improvements 1,163      
Costs Capitalized Subsequent  to Acquisition/ Improvement 50,450      
Land and improvements, gross 37,943      
Buildings and improvements, gross 51,513      
Land and improvements and buildings and improvements, gross 89,456      
Accumulated Depreciation $ 13,584      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 212,322      
555 Mathilda Ave., Sunnyvale, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 37,843      
Initial cost, buildings and Improvements 1,163      
Costs Capitalized Subsequent  to Acquisition/ Improvement 50,447      
Land and improvements, gross 37,943      
Buildings and improvements, gross 51,510      
Land and improvements and buildings and improvements, gross 89,453      
Accumulated Depreciation $ 13,583      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 212,322      
599 Mathilda Ave., Sunnyvale, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 13,538      
Initial cost, buildings and Improvements 12,559      
Costs Capitalized Subsequent  to Acquisition/ Improvement 71      
Land and improvements, gross 13,538      
Buildings and improvements, gross 12,630      
Land and improvements and buildings and improvements, gross 26,168      
Accumulated Depreciation $ 5,800      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 76,031      
605 Mathilda Ave., Sunnyvale, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 29,014      
Initial cost, buildings and Improvements 891      
Costs Capitalized Subsequent  to Acquisition/ Improvement 77,281      
Land and improvements, gross 29,090      
Buildings and improvements, gross 78,096      
Land and improvements and buildings and improvements, gross 107,186      
Accumulated Depreciation $ 30,299      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 162,785      
601 108th Ave., Bellevue, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 214,095      
Costs Capitalized Subsequent  to Acquisition/ Improvement 88,698      
Land and improvements, gross 42,680      
Buildings and improvements, gross 260,113      
Land and improvements and buildings and improvements, gross 302,793      
Accumulated Depreciation $ 118,339      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 490,738      
10900 NE 4th St., Bellevue, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 25,080      
Initial cost, buildings and Improvements 150,877      
Costs Capitalized Subsequent  to Acquisition/ Improvement 52,662      
Land and improvements, gross 25,080      
Buildings and improvements, gross 203,539      
Land and improvements and buildings and improvements, gross 228,619      
Accumulated Depreciation $ 89,219      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 428,557      
2001 W. 8th Ave., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 84,076      
Initial cost, buildings and Improvements 371,154      
Costs Capitalized Subsequent  to Acquisition/ Improvement 3,216      
Land and improvements, gross 84,076      
Buildings and improvements, gross 374,370      
Land and improvements and buildings and improvements, gross 458,446      
Accumulated Depreciation $ 29,772      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 539,226      
333 Dexter Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 42,854      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 328,064      
Land and improvements, gross 42,854      
Buildings and improvements, gross 328,064      
Land and improvements and buildings and improvements, gross 370,918      
Accumulated Depreciation $ 27,405      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 618,766      
701 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 48,027      
Costs Capitalized Subsequent  to Acquisition/ Improvement 9,743      
Land and improvements, gross 0      
Buildings and improvements, gross 57,770      
Land and improvements and buildings and improvements, gross 57,770      
Accumulated Depreciation $ 24,961      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 141,860      
801 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 58,537      
Costs Capitalized Subsequent  to Acquisition/ Improvement 23,304      
Land and improvements, gross 0      
Buildings and improvements, gross 81,841      
Land and improvements and buildings and improvements, gross 81,841      
Accumulated Depreciation $ 30,106      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 173,615      
837 N. 34th St., Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 37,404      
Costs Capitalized Subsequent  to Acquisition/ Improvement 6,734      
Land and improvements, gross 0      
Buildings and improvements, gross 44,138      
Land and improvements and buildings and improvements, gross 44,138      
Accumulated Depreciation $ 18,088      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 112,487      
320 Westlake Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 14,710      
Initial cost, buildings and Improvements 82,018      
Costs Capitalized Subsequent  to Acquisition/ Improvement 15,064      
Land and improvements, gross 14,710      
Buildings and improvements, gross 97,082      
Land and improvements and buildings and improvements, gross 111,792      
Accumulated Depreciation $ 33,902      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 184,644      
321 Terry Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 10,430      
Initial cost, buildings and Improvements 60,003      
Costs Capitalized Subsequent  to Acquisition/ Improvement 10,779      
Land and improvements, gross 10,430      
Buildings and improvements, gross 70,782      
Land and improvements and buildings and improvements, gross 81,212      
Accumulated Depreciation $ 25,693      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 135,755      
401 Terry Ave. North, Seattle, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 22,500      
Initial cost, buildings and Improvements 77,046      
Costs Capitalized Subsequent  to Acquisition/ Improvement 32      
Land and improvements, gross 22,500      
Buildings and improvements, gross 77,078      
Land and improvements and buildings and improvements, gross 99,578      
Accumulated Depreciation $ 24,632      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 174,530      
200 W. 6th St., Austin, TX        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 0      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 644,210      
Land and improvements, gross 0      
Buildings and improvements, gross 644,210      
Land and improvements and buildings and improvements, gross 644,210      
Accumulated Depreciation $ 17,688      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 758,975      
1550 N. El Centro Avenue, Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 16,970      
Initial cost, buildings and Improvements 39      
Costs Capitalized Subsequent  to Acquisition/ Improvement 137,456      
Land and improvements, gross 16,970      
Buildings and improvements, gross 137,495      
Land and improvements and buildings and improvements, gross 154,465      
Accumulated Depreciation $ 30,007      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
6390 De Longpre Ave., Hollywood, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 12,112      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 162,908      
Land and improvements, gross 12,112      
Buildings and improvements, gross 162,908      
Land and improvements and buildings and improvements, gross 175,020      
Accumulated Depreciation $ 12,788      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
3200 Paseo Village Way, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 106,419      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 270,807      
Land and improvements, gross 106,419      
Buildings and improvements, gross 270,807      
Land and improvements and buildings and improvements, gross 377,226      
Accumulated Depreciation $ 30,561      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 0      
Office Building | 12830 El Camino Real, Del Mar, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 375,000      
Office Building | 12100, 12200 and 12312 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 156,386      
Office Building | 320 Westlake Ave. North, WA and 321 Terry Avenue North, Lake Union, WA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 81,308      
Operating Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 612,694      
Initial cost, land and improvements 1,651,703      
Initial cost, buildings and Improvements 2,959,869      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,595,272      
Land and improvements, gross 1,743,170      
Buildings and improvements, gross 8,463,674      
Land and improvements and buildings and improvements, gross 10,206,844      
Accumulated Depreciation $ 2,518,304      
Rentable square feet (unaudited) | ft² 17,044,128      
Undeveloped land and construction in progress        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 0      
Initial cost, land and improvements 913,363      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,121,441      
Land and improvements, gross 913,363      
Buildings and improvements, gross 1,121,441      
Land and improvements and buildings and improvements, gross 2,034,804      
Accumulated Depreciation $ 0      
Rentable square feet (unaudited) | ft² 0