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Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
ft²
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 606,688      
Initial cost, land and improvements 2,569,615      
Initial cost, buildings and Improvements 2,974,035      
Costs Capitalized Subsequent  to Acquisition/ Improvement 7,115,545      
Land and improvements, gross 2,662,706      
Buildings and improvements, gross 9,996,489      
Land and improvements and buildings and improvements, gross 12,659,195      
Accumulated Depreciation $ 2,824,616 $ 2,518,304 $ 2,218,710 $ 2,003,656
Rentable square feet (unaudited) | ft² 17,142,721      
Total other (expenses) income $ (101,556) $ (91,624) $ (65,184)  
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 3,946      
Land and improvements, gross 150,718      
Buildings and improvements, gross 34,979      
Land and improvements and buildings and improvements, gross 185,697      
Accumulated Depreciation $ 24,483      
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 30,549      
Land and improvements, gross 1,048      
Buildings and improvements, gross 42,308      
Land and improvements and buildings and improvements, gross 43,356      
Accumulated Depreciation $ 32,678      
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 37,806      
Land and improvements, gross 2,547      
Buildings and improvements, gross 66,900      
Land and improvements and buildings and improvements, gross 69,447      
Accumulated Depreciation $ 62,771      
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 37,660      
Land and improvements, gross 2,547      
Buildings and improvements, gross 66,001      
Land and improvements and buildings and improvements, gross 68,548      
Accumulated Depreciation $ 27,479      
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 56,884      
Land and improvements, gross 3,565      
Buildings and improvements, gross 90,938      
Land and improvements and buildings and improvements, gross 94,503      
Accumulated Depreciation $ 58,445      
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 18,843      
Land and improvements, gross 1,407      
Buildings and improvements, gross 53,169      
Land and improvements and buildings and improvements, gross 54,576      
Accumulated Depreciation $ 35,932      
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 14,279      
Land and improvements, gross 1,575      
Buildings and improvements, gross 14,279      
Land and improvements and buildings and improvements, gross 15,854      
Accumulated Depreciation $ 1,686      
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 120,284      
Land and improvements, gross 17,588      
Buildings and improvements, gross 120,284      
Land and improvements and buildings and improvements, gross 137,872      
Accumulated Depreciation $ 14,689      
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 103,352      
Land and improvements, gross 15,578      
Buildings and improvements, gross 103,352      
Land and improvements and buildings and improvements, gross 118,930      
Accumulated Depreciation $ 12,566      
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 3,261      
Land and improvements, gross 278      
Buildings and improvements, gross 3,261      
Land and improvements and buildings and improvements, gross 3,539      
Accumulated Depreciation $ 388      
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 64,018      
Land and improvements, gross 9,235      
Buildings and improvements, gross 64,039      
Land and improvements and buildings and improvements, gross 73,274      
Accumulated Depreciation $ 19,739      
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 9,771      
Land and improvements, gross 1,318      
Buildings and improvements, gross 9,774      
Land and improvements and buildings and improvements, gross 11,092      
Accumulated Depreciation $ 2,920      
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 120,168      
Land and improvements, gross 22,153      
Buildings and improvements, gross 120,219      
Land and improvements and buildings and improvements, gross 142,372      
Accumulated Depreciation $ 30,223      
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 17,435      
Land and improvements, gross 2,455      
Buildings and improvements, gross 16,296      
Land and improvements and buildings and improvements, gross 18,751      
Accumulated Depreciation $ 5,988      
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 44,205      
Land and improvements, gross 8,703      
Buildings and improvements, gross 50,878      
Land and improvements and buildings and improvements, gross 59,581      
Accumulated Depreciation $ 14,768      
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 56,481      
Land and improvements, gross 18,111      
Buildings and improvements, gross 116,801      
Land and improvements and buildings and improvements, gross 134,912      
Accumulated Depreciation $ 63,863      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 325,772      
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 13,679      
Land and improvements, gross 0      
Buildings and improvements, gross 15,620      
Land and improvements and buildings and improvements, gross 15,620      
Accumulated Depreciation $ 13,303      
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 24,129      
Land and improvements, gross 0      
Buildings and improvements, gross 41,596      
Land and improvements and buildings and improvements, gross 41,596      
Accumulated Depreciation $ 33,855      
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 41,111      
Land and improvements, gross 0      
Buildings and improvements, gross 63,430      
Land and improvements and buildings and improvements, gross 63,430      
Accumulated Depreciation $ 50,720      
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 25,730      
Land and improvements, gross 0      
Buildings and improvements, gross 45,138      
Land and improvements and buildings and improvements, gross 45,138      
Accumulated Depreciation $ 33,291      
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 30,210      
Land and improvements, gross 0      
Buildings and improvements, gross 43,796      
Land and improvements and buildings and improvements, gross 43,796      
Accumulated Depreciation $ 22,382      
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 12,848      
Land and improvements, gross 0      
Buildings and improvements, gross 22,552      
Land and improvements and buildings and improvements, gross 22,552      
Accumulated Depreciation $ 7,944      
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 21,523      
Land and improvements, gross 0      
Buildings and improvements, gross 34,138      
Land and improvements and buildings and improvements, gross 34,138      
Accumulated Depreciation $ 23,230      
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 8,067      
Land and improvements, gross 9,720      
Buildings and improvements, gross 59,023      
Land and improvements and buildings and improvements, gross 68,743      
Accumulated Depreciation $ 17,404      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 76,359      
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 7,277      
Land and improvements, gross 31,693      
Buildings and improvements, gross 35,251      
Land and improvements and buildings and improvements, gross 66,944      
Accumulated Depreciation $ 10,491      
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 1,847      
Land and improvements, gross 10,013      
Buildings and improvements, gross 5,542      
Land and improvements and buildings and improvements, gross 15,555      
Accumulated Depreciation $ 1,807      
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 6,162      
Land and improvements, gross 39,954      
Buildings and improvements, gross 34,046      
Land and improvements and buildings and improvements, gross 74,000      
Accumulated Depreciation $ 9,816      
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 27,407      
Land and improvements, gross 9,633      
Buildings and improvements, gross 63,737      
Land and improvements and buildings and improvements, gross 73,370      
Accumulated Depreciation $ 39,243      
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 29,817      
Land and improvements, gross 3,977      
Buildings and improvements, gross 65,657      
Land and improvements and buildings and improvements, gross 69,634      
Accumulated Depreciation $ 50,837      
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 7,029      
Land and improvements, gross 22,100      
Buildings and improvements, gross 60,199      
Land and improvements and buildings and improvements, gross 82,299      
Accumulated Depreciation $ 24,095      
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 $ 21,030      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 78,900      
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 20,980      
Land and improvements, gross 5,476      
Buildings and improvements, gross 47,065      
Land and improvements and buildings and improvements, gross 52,541      
Accumulated Depreciation $ 33,534      
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 19,568      
Land and improvements, gross 4,551      
Buildings and improvements, gross 31,608      
Land and improvements and buildings and improvements, gross 36,159      
Accumulated Depreciation $ 25,203      
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 4,870      
Land and improvements, gross 1,673      
Buildings and improvements, gross 14,530      
Land and improvements and buildings and improvements, gross 16,203      
Accumulated Depreciation $ 11,378      
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 10,372      
Land and improvements, gross 1,540      
Buildings and improvements, gross 18,882      
Land and improvements and buildings and improvements, gross 20,422      
Accumulated Depreciation $ 14,674      
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 34,342      
Land and improvements, gross 4,201      
Buildings and improvements, gross 34,342      
Land and improvements and buildings and improvements, gross 38,543      
Accumulated Depreciation $ 5,413      
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 12,895      
Land and improvements, gross 3,453      
Buildings and improvements, gross 24,876      
Land and improvements and buildings and improvements, gross 28,329      
Accumulated Depreciation $ 15,657      
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 35,074      
Land and improvements, gross 9,360      
Buildings and improvements, gross 35,074      
Land and improvements and buildings and improvements, gross 44,434      
Accumulated Depreciation $ 9,531      
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 24,295      
Land and improvements, gross 18,398      
Buildings and improvements, gross 79,249      
Land and improvements and buildings and improvements, gross 97,647      
Accumulated Depreciation $ 32,182      
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 17,143      
Land and improvements, gross 10,252      
Buildings and improvements, gross 38,379      
Land and improvements and buildings and improvements, gross 48,631      
Accumulated Depreciation $ 14,435      
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 113,154      
Land and improvements, gross 28,645      
Buildings and improvements, gross 113,154      
Land and improvements and buildings and improvements, gross 141,799      
Accumulated Depreciation $ 16,697      
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 51,970      
Land and improvements, gross 11,326      
Buildings and improvements, gross 51,970      
Land and improvements and buildings and improvements, gross 63,296      
Accumulated Depreciation $ 7,822      
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 9,084      
Land and improvements, gross 1,629      
Buildings and improvements, gross 12,180      
Land and improvements and buildings and improvements, gross 13,809      
Accumulated Depreciation $ 9,465      
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 49,940      
Land and improvements, gross 15,167      
Buildings and improvements, gross 49,940      
Land and improvements and buildings and improvements, gross 65,107      
Accumulated Depreciation $ 13,021      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 216,518      
12707 High Bluff Dr., Del Mar, CA (7)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,013      
Initial cost, buildings and Improvements 8,032      
Costs Capitalized Subsequent  to Acquisition/ Improvement 915      
Land and improvements, gross 3,013      
Buildings and improvements, gross 8,947      
Land and improvements and buildings and improvements, gross 11,960      
Accumulated Depreciation $ 148      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 59,245      
12777 High Bluff Dr., Del Mar, CA (7)        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 3,013      
Initial cost, buildings and Improvements 6,134      
Costs Capitalized Subsequent  to Acquisition/ Improvement 687      
Land and improvements, gross 3,013      
Buildings and improvements, gross 6,821      
Land and improvements and buildings and improvements, gross 9,834      
Accumulated Depreciation $ 115      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 44,486      
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 11,834      
Land and improvements, gross 2,858      
Buildings and improvements, gross 18,040      
Land and improvements and buildings and improvements, gross 20,898      
Accumulated Depreciation $ 12,631      
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 29,673      
Land and improvements, gross 5,259      
Buildings and improvements, gross 47,950      
Land and improvements and buildings and improvements, gross 53,209      
Accumulated Depreciation $ 35,382      
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 $ 31,791      
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 18,378      
Land and improvements, gross 4,254      
Buildings and improvements, gross 37,388      
Land and improvements and buildings and improvements, gross 41,642      
Accumulated Depreciation $ 24,813      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 117,777      
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 $ 27,962      
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 76,146      
Land and improvements, gross 24,358      
Buildings and improvements, gross 76,146      
Land and improvements and buildings and improvements, gross 100,504      
Accumulated Depreciation $ 13,728      
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 67,507      
Land and improvements, gross 7,997      
Buildings and improvements, gross 67,507      
Land and improvements and buildings and improvements, gross 75,504      
Accumulated Depreciation $ 31,255      
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 25,885      
Land and improvements, gross 7,580      
Buildings and improvements, gross 61,789      
Land and improvements and buildings and improvements, gross 69,369      
Accumulated Depreciation $ 36,868      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 137,660      
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 28,348      
Land and improvements, gross 7,580      
Buildings and improvements, gross 64,252      
Land and improvements and buildings and improvements, gross 71,832      
Accumulated Depreciation $ 38,951      
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 108,772      
Land and improvements, gross 19,861      
Buildings and improvements, gross 108,772      
Land and improvements and buildings and improvements, gross 128,633      
Accumulated Depreciation $ 7,089      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 212,423      
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 11,932      
Land and improvements, gross 5,240      
Buildings and improvements, gross 34,152      
Land and improvements and buildings and improvements, gross 39,392      
Accumulated Depreciation $ 18,231      
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 20,929      
Land and improvements, gross 1,624      
Buildings and improvements, gross 19,305      
Land and improvements and buildings and improvements, gross 20,929      
Accumulated Depreciation $ 713      
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 79,595      
Land and improvements, gross 6,081      
Buildings and improvements, gross 79,595      
Land and improvements and buildings and improvements, gross 85,676      
Accumulated Depreciation $ 9,798      
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 47,756      
Land and improvements, gross 4,928      
Buildings and improvements, gross 47,756      
Land and improvements and buildings and improvements, gross 52,684      
Accumulated Depreciation $ 2,069      
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 1,525      
Land and improvements, gross 4,860      
Buildings and improvements, gross 17,026      
Land and improvements and buildings and improvements, gross 21,886      
Accumulated Depreciation $ 7,204      
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 8,364      
Land and improvements, gross 4,662      
Buildings and improvements, gross 23,906      
Land and improvements and buildings and improvements, gross 28,568      
Accumulated Depreciation $ 10,605      
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 8,047      
Land and improvements, gross 6,470      
Buildings and improvements, gross 29,062      
Land and improvements and buildings and improvements, gross 35,532      
Accumulated Depreciation $ 12,961      
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 3,237      
Land and improvements, gross 0      
Buildings and improvements, gross 3,237      
Land and improvements and buildings and improvements, gross 3,237      
Accumulated Depreciation $ 2,177      
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 5,795      
Land and improvements, gross 6,470      
Buildings and improvements, gross 26,809      
Land and improvements and buildings and improvements, gross 33,279      
Accumulated Depreciation $ 11,874      
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 $ 9,832      
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 $ 9,755      
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 13,130      
Land and improvements, gross 28,730      
Buildings and improvements, gross 40,685      
Land and improvements and buildings and improvements, gross 69,415      
Accumulated Depreciation $ 11,591      
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 $ 19,459      
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 $ 19,376      
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 $ 24,020      
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 $ 7,582      
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 109,620      
Land and improvements, gross 18,063      
Buildings and improvements, gross 108,225      
Land and improvements and buildings and improvements, gross 126,288      
Accumulated Depreciation $ 35,124      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 228,226      
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 64,606      
Land and improvements, gross 8,626      
Buildings and improvements, gross 63,939      
Land and improvements and buildings and improvements, gross 72,565      
Accumulated Depreciation $ 16,538      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 119,616      
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 $ 35,842      
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 84,007      
Land and improvements, gross 49,150      
Buildings and improvements, gross 215,245      
Land and improvements and buildings and improvements, gross 264,395      
Accumulated Depreciation $ 115,810      
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 120,741      
Land and improvements, gross 63,550      
Buildings and improvements, gross 274,894      
Land and improvements and buildings and improvements, gross 338,444      
Accumulated Depreciation $ 146,435      
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 79,707      
Land and improvements, gross 19,260      
Buildings and improvements, gross 163,725      
Land and improvements and buildings and improvements, gross 182,985      
Accumulated Depreciation $ 103,058      
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 128,515      
Land and improvements, gross 28,504      
Buildings and improvements, gross 188,246      
Land and improvements and buildings and improvements, gross 216,750      
Accumulated Depreciation $ 81,239      
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 10,797      
Land and improvements, gross 7,630      
Buildings and improvements, gross 33,567      
Land and improvements and buildings and improvements, gross 41,197      
Accumulated Depreciation $ 16,440      
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 17,204      
Land and improvements, gross 5,910      
Buildings and improvements, gross 39,654      
Land and improvements and buildings and improvements, gross 45,564      
Accumulated Depreciation $ 17,652      
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 80,685      
Land and improvements, gross 18,645      
Buildings and improvements, gross 80,685      
Land and improvements and buildings and improvements, gross 99,330      
Accumulated Depreciation $ 21,215      
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 1,358      
Land and improvements, gross 29,403      
Buildings and improvements, gross 114,539      
Land and improvements and buildings and improvements, gross 143,942      
Accumulated Depreciation $ 20,282      
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 212,742      
Land and improvements, gross 52,815      
Buildings and improvements, gross 212,742      
Land and improvements and buildings and improvements, gross 265,557      
Accumulated Depreciation $ 57,855      
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 1      
Land and improvements, gross 13,745      
Buildings and improvements, gross 18,576      
Land and improvements and buildings and improvements, gross 32,321      
Accumulated Depreciation $ 3,948      
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 $ 3,905      
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 $ 6,145      
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 177,042      
Land and improvements, gross 23,719      
Buildings and improvements, gross 177,042      
Land and improvements and buildings and improvements, gross 200,761      
Accumulated Depreciation $ 17,251      
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 165,497      
Land and improvements, gross 23,449      
Buildings and improvements, gross 165,497      
Land and improvements and buildings and improvements, gross 188,946      
Accumulated Depreciation $ 17,361      
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 141,041      
Land and improvements, gross 19,538      
Buildings and improvements, gross 141,041      
Land and improvements and buildings and improvements, gross 160,579      
Accumulated Depreciation $ 17,349      
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 $ 15,019      
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 $ 15,018      
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 609      
Land and improvements, gross 13,538      
Buildings and improvements, gross 13,168      
Land and improvements and buildings and improvements, gross 26,706      
Accumulated Depreciation $ 6,212      
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 $ 33,548      
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 90,414      
Land and improvements, gross 42,680      
Buildings and improvements, gross 261,829      
Land and improvements and buildings and improvements, gross 304,509      
Accumulated Depreciation $ 127,395      
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 55,231      
Land and improvements, gross 25,080      
Buildings and improvements, gross 206,108      
Land and improvements and buildings and improvements, gross 231,188      
Accumulated Depreciation $ 98,543      
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 27,388      
Land and improvements, gross 84,076      
Buildings and improvements, gross 398,542      
Land and improvements and buildings and improvements, gross 482,618      
Accumulated Depreciation $ 41,445      
Depreciation life 35 years      
Rentable square feet (unaudited) | ft² 535,395      
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 $ 37,737      
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 12,145      
Land and improvements, gross 0      
Buildings and improvements, gross 60,172      
Land and improvements and buildings and improvements, gross 60,172      
Accumulated Depreciation $ 27,052      
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 23,824      
Land and improvements, gross 0      
Buildings and improvements, gross 82,361      
Land and improvements and buildings and improvements, gross 82,361      
Accumulated Depreciation $ 33,635      
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 7,354      
Land and improvements, gross 0      
Buildings and improvements, gross 44,758      
Land and improvements and buildings and improvements, gross 44,758      
Accumulated Depreciation $ 19,792      
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 15,219      
Land and improvements, gross 14,710      
Buildings and improvements, gross 97,237      
Land and improvements and buildings and improvements, gross 111,947      
Accumulated Depreciation $ 37,480      
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 11,066      
Land and improvements, gross 10,430      
Buildings and improvements, gross 71,069      
Land and improvements and buildings and improvements, gross 81,499      
Accumulated Depreciation $ 28,230      
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 $ 26,718      
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 654,578      
Land and improvements, gross 0      
Buildings and improvements, gross 654,578      
Land and improvements and buildings and improvements, gross 654,578      
Accumulated Depreciation $ 38,398      
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 138,148      
Land and improvements, gross 16,970      
Buildings and improvements, gross 138,187      
Land and improvements and buildings and improvements, gross 155,157      
Accumulated Depreciation $ 34,097      
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 162,481      
Land and improvements, gross 12,112      
Buildings and improvements, gross 162,481      
Land and improvements and buildings and improvements, gross 174,593      
Accumulated Depreciation $ 17,436      
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 272,044      
Land and improvements, gross 106,419      
Buildings and improvements, gross 272,044      
Land and improvements and buildings and improvements, gross 378,463      
Accumulated Depreciation $ 38,354      
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 152,668      
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 79,020      
Operating Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 606,688      
Initial cost, land and improvements 1,657,729      
Initial cost, buildings and Improvements 2,974,035      
Costs Capitalized Subsequent  to Acquisition/ Improvement 5,717,807      
Land and improvements, gross 1,750,820      
Buildings and improvements, gross 8,598,751      
Land and improvements and buildings and improvements, gross 10,349,571      
Accumulated Depreciation $ 2,824,616      
Rentable square feet (unaudited) | ft² 17,142,721      
Undeveloped land and construction in progress        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 0      
Initial cost, land and improvements 911,886      
Initial cost, buildings and Improvements 0      
Costs Capitalized Subsequent  to Acquisition/ Improvement 1,397,738      
Land and improvements, gross 911,886      
Buildings and improvements, gross 1,397,738      
Land and improvements and buildings and improvements, gross 2,309,624      
Accumulated Depreciation $ 0      
Rentable square feet (unaudited) | ft² 0