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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, 2021
USD ($)
ft²
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 249,023      
Initial cost, land and improvements 2,480,902      
Initial cost, buildings and Improvements 3,036,949      
Costs capitalized subsequent to acquisition/ improvement 5,774,842      
Land and improvements, gross 2,615,603      
Buildings and improvements, gross 8,677,090      
Land and improvements and buildings and improvements, gross 11,292,693      
Accumulated depreciation $ 2,003,656 $ 1,798,646 $ 1,561,361 $ 1,391,368
Rentable square feet | ft² 15,456,528      
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 373      
Land and improvements, gross 150,718      
Buildings and improvements, gross 31,406      
Land and improvements and buildings and improvements, gross 182,124      
Accumulated depreciation $ 11,019      
Depreciation life 35 years      
Rentable square feet | ft² 151,908      
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 29,602      
Land and improvements, gross 1,048      
Buildings and improvements, gross 41,361      
Land and improvements and buildings and improvements, gross 42,409      
Accumulated depreciation $ 29,440      
Depreciation life 35 years      
Rentable square feet | 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 36,344      
Land and improvements, gross 2,547      
Buildings and improvements, gross 65,438      
Land and improvements and buildings and improvements, gross 67,985      
Accumulated depreciation $ 58,352      
Depreciation life 35 years      
Rentable square feet | 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 36,805      
Land and improvements, gross 2,547      
Buildings and improvements, gross 65,146      
Land and improvements and buildings and improvements, gross 67,693      
Accumulated depreciation $ 20,796      
Depreciation life 35 years      
Rentable square feet | 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 54,232      
Land and improvements, gross 3,577      
Buildings and improvements, gross 88,274      
Land and improvements and buildings and improvements, gross 91,851      
Accumulated depreciation $ 47,780      
Depreciation life 35 years      
Rentable square feet | 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 17,998      
Land and improvements, gross 1,407      
Buildings and improvements, gross 52,324      
Land and improvements and buildings and improvements, gross 53,731      
Accumulated depreciation $ 29,513      
Depreciation life 35 years      
Rentable square feet | 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 14,192      
Land and improvements, gross 1,575      
Buildings and improvements, gross 14,192      
Land and improvements and buildings and improvements, gross 15,767      
Accumulated depreciation $ 470      
Depreciation life 35 years      
Rentable square feet | 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 120,733      
Land and improvements, gross 17,588      
Buildings and improvements, gross 120,733      
Land and improvements and buildings and improvements, gross 138,321      
Accumulated depreciation $ 4,074      
Depreciation life 35 years      
Rentable square feet | 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 102,725      
Land and improvements, gross 15,578      
Buildings and improvements, gross 102,725      
Land and improvements and buildings and improvements, gross 118,303      
Accumulated depreciation $ 3,475      
Depreciation life 35 years      
Rentable square feet | 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 3,249      
Land and improvements, gross 278      
Buildings and improvements, gross 3,249      
Land and improvements and buildings and improvements, gross 3,527      
Accumulated depreciation $ 107      
Depreciation life 35 years      
Rentable square feet | 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 59,075      
Land and improvements, gross 9,235      
Buildings and improvements, gross 59,096      
Land and improvements and buildings and improvements, gross 68,331      
Accumulated depreciation $ 14,287      
Depreciation life 35 years      
Rentable square feet | 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 9,745      
Land and improvements, gross 1,318      
Buildings and improvements, gross 9,748      
Land and improvements and buildings and improvements, gross 11,066      
Accumulated depreciation $ 1,877      
Depreciation life 35 years      
Rentable square feet | 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 119,573      
Land and improvements, gross 22,153      
Buildings and improvements, gross 119,624      
Land and improvements and buildings and improvements, gross 141,777      
Accumulated depreciation $ 19,165      
Depreciation life 35 years      
Rentable square feet | 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 17,127      
Land and improvements, gross 2,455      
Buildings and improvements, gross 15,988      
Land and improvements and buildings and improvements, gross 18,443      
Accumulated depreciation $ 3,417      
Depreciation life 35 years      
Rentable square feet | 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 44,014      
Land and improvements, gross 8,703      
Buildings and improvements, gross 50,687      
Land and improvements and buildings and improvements, gross 59,390      
Accumulated depreciation $ 10,397      
Depreciation life 35 years      
Rentable square feet | 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 51,016      
Land and improvements, gross 18,111      
Buildings and improvements, gross 111,336      
Land and improvements and buildings and improvements, gross 129,447      
Accumulated depreciation $ 47,448      
Depreciation life 35 years      
Rentable square feet | ft² 323,920      
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 13,776      
Land and improvements, gross 0      
Buildings and improvements, gross 15,717      
Land and improvements and buildings and improvements, gross 15,717      
Accumulated depreciation $ 11,673      
Depreciation life 35 years      
Rentable square feet | 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 20,058      
Land and improvements, gross 0      
Buildings and improvements, gross 37,525      
Land and improvements and buildings and improvements, gross 37,525      
Accumulated depreciation $ 29,395      
Depreciation life 35 years      
Rentable square feet | 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 35,319      
Land and improvements, gross 0      
Buildings and improvements, gross 57,638      
Land and improvements and buildings and improvements, gross 57,638      
Accumulated depreciation $ 43,899      
Depreciation life 35 years      
Rentable square feet | 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 23,983      
Land and improvements, gross 0      
Buildings and improvements, gross 43,391      
Land and improvements and buildings and improvements, gross 43,391      
Accumulated depreciation $ 28,068      
Depreciation life 35 years      
Rentable square feet | 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 14,378      
Land and improvements, gross 0      
Buildings and improvements, gross 27,964      
Land and improvements and buildings and improvements, gross 27,964      
Accumulated depreciation $ 17,427      
Depreciation life 35 years      
Rentable square feet | ft² 136,026      
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 12,108      
Land and improvements, gross 0      
Buildings and improvements, gross 21,812      
Land and improvements and buildings and improvements, gross 21,812      
Accumulated depreciation $ 5,926      
Depreciation life 35 years      
Rentable square feet | 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 15,684      
Land and improvements, gross 0      
Buildings and improvements, gross 28,299      
Land and improvements and buildings and improvements, gross 28,299      
Accumulated depreciation $ 20,177      
Depreciation life 35 years      
Rentable square feet | ft² 130,935      
Kilroy Airport Center, Phase IV, Long Beach, 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 4,997      
Land and improvements, gross 0      
Buildings and improvements, gross 4,997      
Land and improvements and buildings and improvements, gross 4,997      
Accumulated depreciation $ 4,997      
Depreciation life 35 years      
Rentable square feet | ft² 0      
8560 W. Sunset Blvd., West Hollywood, CA        
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 2,995      
Land and improvements, gross 9,720      
Buildings and improvements, gross 53,951      
Land and improvements and buildings and improvements, gross 63,671      
Accumulated depreciation $ 10,543      
Depreciation life 35 years      
Rentable square feet | 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 6,935      
Land and improvements, gross 31,693      
Buildings and improvements, gross 34,909      
Land and improvements and buildings and improvements, gross 66,602      
Accumulated depreciation $ 5,523      
Depreciation life 35 years      
Rentable square feet | 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 1,473      
Land and improvements, gross 10,013      
Buildings and improvements, gross 5,168      
Land and improvements and buildings and improvements, gross 15,181      
Accumulated depreciation $ 679      
Depreciation life 35 years      
Rentable square feet | 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 5,428      
Land and improvements, gross 39,954      
Buildings and improvements, gross 33,312      
Land and improvements and buildings and improvements, gross 73,266      
Accumulated depreciation $ 5,678      
Depreciation life 35 years      
Rentable square feet | 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 21,147      
Land and improvements, gross 9,633      
Buildings and improvements, gross 57,477      
Land and improvements and buildings and improvements, gross 67,110      
Accumulated depreciation $ 32,649      
Depreciation life 35 years      
Rentable square feet | ft² 152,048      
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 25,844      
Land and improvements, gross 3,977      
Buildings and improvements, gross 61,684      
Land and improvements and buildings and improvements, gross 65,661      
Accumulated depreciation $ 44,791      
Depreciation life 35 years      
Rentable square feet | ft² 150,832      
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 6,030      
Land and improvements, gross 22,100      
Buildings and improvements, gross 59,200      
Land and improvements and buildings and improvements, gross 81,300      
Accumulated depreciation $ 18,217      
Depreciation life 35 years      
Rentable square feet | ft² 151,029      
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 12,490      
Land and improvements, gross 3,399      
Buildings and improvements, gross 24,618      
Land and improvements and buildings and improvements, gross 28,017      
Accumulated depreciation $ 16,457      
Depreciation life 35 years      
Rentable square feet | ft² 76,644      
1633 26th St., Santa Monica, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 2,080      
Initial cost, buildings and Improvements 6,672      
Costs capitalized subsequent to acquisition/ improvement 4,029      
Land and improvements, gross 2,040      
Buildings and improvements, gross 10,741      
Land and improvements and buildings and improvements, gross 12,781      
Accumulated depreciation $ 8,000      
Depreciation life 35 years      
Rentable square feet | ft² 43,857      
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 14,910      
Land and improvements, gross 5,476      
Buildings and improvements, gross 40,995      
Land and improvements and buildings and improvements, gross 46,471      
Accumulated depreciation $ 29,054      
Depreciation life 35 years      
Rentable square feet | ft² 102,864      
3130 Wilshire Blvd., Santa Monica, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 8,921      
Initial cost, buildings and Improvements 6,579      
Costs capitalized subsequent to acquisition/ improvement 17,261      
Land and improvements, gross 9,188      
Buildings and improvements, gross 23,573      
Land and improvements and buildings and improvements, gross 32,761      
Accumulated depreciation $ 18,444      
Depreciation life 35 years      
Rentable square feet | ft² 90,074      
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 17,544      
Land and improvements, gross 4,551      
Buildings and improvements, gross 29,584      
Land and improvements and buildings and improvements, gross 34,135      
Accumulated depreciation $ 20,812      
Depreciation life 35 years      
Rentable square feet | ft² 76,803      
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 3,968      
Land and improvements, gross 1,673      
Buildings and improvements, gross 13,628      
Land and improvements and buildings and improvements, gross 15,301      
Accumulated depreciation $ 10,023      
Depreciation life 35 years      
Rentable square feet | 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 9,979      
Land and improvements, gross 1,540      
Buildings and improvements, gross 18,489      
Land and improvements and buildings and improvements, gross 20,029      
Accumulated depreciation $ 11,991      
Depreciation life 35 years      
Rentable square feet | ft² 53,751      
12340 El Camino Real, Del Mar, 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 2,964      
Land and improvements, gross 0      
Buildings and improvements, gross 2,964      
Land and improvements and buildings and improvements, gross 2,964      
Accumulated depreciation $ 2,666      
Depreciation life 35 years      
Rentable square feet | ft² 0      
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 11,915      
Land and improvements, gross 3,453      
Buildings and improvements, gross 23,896      
Land and improvements and buildings and improvements, gross 27,349      
Accumulated depreciation $ 11,812      
Depreciation life 35 years      
Rentable square feet | ft² 69,421      
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 34,957      
Land and improvements, gross 9,360      
Buildings and improvements, gross 34,957      
Land and improvements and buildings and improvements, gross 44,317      
Accumulated depreciation $ 5,710      
Depreciation life 35 years      
Rentable square feet | 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 24,110      
Land and improvements, gross 18,398      
Buildings and improvements, gross 79,064      
Land and improvements and buildings and improvements, gross 97,462      
Accumulated depreciation $ 21,969      
Depreciation life 35 years      
Rentable square feet | 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 16,722      
Land and improvements, gross 10,252      
Buildings and improvements, gross 37,958      
Land and improvements and buildings and improvements, gross 48,210      
Accumulated depreciation $ 8,265      
Depreciation life 35 years      
Rentable square feet | 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 110,541      
Land and improvements, gross 28,645      
Buildings and improvements, gross 110,541      
Land and improvements and buildings and improvements, gross 139,186      
Accumulated depreciation $ 4,937      
Depreciation life 35 years      
Rentable square feet | 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 51,583      
Land and improvements, gross 11,326      
Buildings and improvements, gross 51,583      
Land and improvements and buildings and improvements, gross 62,909      
Accumulated depreciation $ 2,469      
Depreciation life 35 years      
Rentable square feet | 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 8,002      
Land and improvements, gross 1,629      
Buildings and improvements, gross 11,098      
Land and improvements and buildings and improvements, gross 12,727      
Accumulated depreciation $ 7,459      
Depreciation life 35 years      
Rentable square feet | ft² 39,193      
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 40,497      
Costs capitalized subsequent to acquisition/ improvement 17,519      
Land and improvements, gross 15,167      
Buildings and improvements, gross 58,016      
Land and improvements and buildings and improvements, gross 73,183      
Accumulated depreciation $ 33,889      
Depreciation life 35 years      
Rentable square feet | ft² 210,732      
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 11,146      
Land and improvements, gross 2,858      
Buildings and improvements, gross 17,352      
Land and improvements and buildings and improvements, gross 20,210      
Accumulated depreciation $ 10,907      
Depreciation life 35 years      
Rentable square feet | 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 29,206      
Land and improvements, gross 5,259      
Buildings and improvements, gross 47,483      
Land and improvements and buildings and improvements, gross 52,742      
Accumulated depreciation $ 29,118      
Depreciation life 35 years      
Rentable square feet | 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 20,058      
Land and improvements, gross 4,725      
Buildings and improvements, gross 40,515      
Land and improvements and buildings and improvements, gross 45,240      
Accumulated depreciation $ 25,962      
Depreciation life 35 years      
Rentable square feet | ft² 128,364      
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 15,428      
Land and improvements, gross 4,254      
Buildings and improvements, gross 34,438      
Land and improvements and buildings and improvements, gross 38,692      
Accumulated depreciation $ 21,028      
Depreciation life 35 years      
Rentable square feet | 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 21,589      
Land and improvements, gross 4,457      
Buildings and improvements, gross 36,736      
Land and improvements and buildings and improvements, gross 41,193      
Accumulated depreciation $ 25,136      
Depreciation life 35 years      
Rentable square feet | 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 72,833      
Land and improvements, gross 24,358      
Buildings and improvements, gross 72,833      
Land and improvements and buildings and improvements, gross 97,191      
Accumulated depreciation $ 6,598      
Depreciation life 35 years      
Rentable square feet | 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 52,956      
Land and improvements, gross 7,997      
Buildings and improvements, gross 52,956      
Land and improvements and buildings and improvements, gross 60,953      
Accumulated depreciation $ 23,882      
Depreciation life 35 years      
Rentable square feet | ft² 154,157      
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 24,304      
Land and improvements, gross 7,580      
Buildings and improvements, gross 60,208      
Land and improvements and buildings and improvements, gross 67,788      
Accumulated depreciation $ 27,824      
Depreciation life 35 years      
Rentable square feet | 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 22,443      
Land and improvements, gross 7,580      
Buildings and improvements, gross 58,347      
Land and improvements and buildings and improvements, gross 65,927      
Accumulated depreciation $ 29,944      
Depreciation life 35 years      
Rentable square feet | ft² 143,654      
2305 Historic Decatur Rd., Point Loma, 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 9,559      
Land and improvements, gross 5,240      
Buildings and improvements, gross 31,779      
Land and improvements and buildings and improvements, gross 37,019      
Accumulated depreciation $ 13,822      
Depreciation life 35 years      
Rentable square feet | ft² 107,456      
4690 Executive Dr., University Towne Centre, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, land and improvements $ 1,623      
Initial cost, buildings and Improvements 7,926      
Costs capitalized subsequent to acquisition/ improvement 3,678      
Land and improvements, gross 1,623      
Buildings and improvements, gross 11,604      
Land and improvements and buildings and improvements, gross 13,227      
Accumulated depreciation $ 8,642      
Depreciation life 35 years      
Rentable square feet | ft² 47,846      
9455 Towne Centre Dr., University Towne Centre, 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 80,294      
Land and improvements, gross 6,081      
Buildings and improvements, gross 80,294      
Land and improvements and buildings and improvements, gross 86,375      
Accumulated depreciation $ 2,456      
Depreciation life 35 years      
Rentable square feet | ft² 160,444      
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 1,198      
Land and improvements, gross 4,860      
Buildings and improvements, gross 16,699      
Land and improvements and buildings and improvements, gross 21,559      
Accumulated depreciation $ 5,588      
Depreciation life 35 years      
Rentable square feet | ft² 47,379      
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 5,552      
Land and improvements, gross 4,662      
Buildings and improvements, gross 21,094      
Land and improvements and buildings and improvements, gross 25,756      
Accumulated depreciation $ 7,394      
Depreciation life 35 years      
Rentable square feet | ft² 45,451      
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 5,992      
Land and improvements, gross 6,470      
Buildings and improvements, gross 27,007      
Land and improvements and buildings and improvements, gross 33,477      
Accumulated depreciation $ 9,286      
Depreciation life 35 years      
Rentable square feet | ft² 63,079      
4400 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 3,919      
Land and improvements, gross 4,939      
Buildings and improvements, gross 19,184      
Land and improvements and buildings and improvements, gross 24,123      
Accumulated depreciation $ 7,011      
Depreciation life 35 years      
Rentable square feet | ft² 48,146      
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 3,805      
Land and improvements, gross 6,470      
Buildings and improvements, gross 24,819      
Land and improvements and buildings and improvements, gross 31,289      
Accumulated depreciation $ 8,488      
Depreciation life 35 years      
Rentable square feet | ft² 63,078      
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 4,105      
Land and improvements, gross 4,939      
Buildings and improvements, gross 19,370      
Land and improvements and buildings and improvements, gross 24,309      
Accumulated depreciation $ 7,168      
Depreciation life 35 years      
Rentable square feet | ft² 48,147      
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 1,614      
Land and improvements, gross 6,470      
Buildings and improvements, gross 22,629      
Land and improvements and buildings and improvements, gross 29,099      
Accumulated depreciation $ 7,761      
Depreciation life 35 years      
Rentable square feet | ft² 63,078      
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 1,743      
Land and improvements, gross 28,730      
Buildings and improvements, gross 29,298      
Land and improvements and buildings and improvements, gross 58,028      
Accumulated depreciation $ 6,520      
Depreciation life 35 years      
Rentable square feet | 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 $ 13,689      
Depreciation life 35 years      
Rentable square feet | 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 $ 13,630      
Depreciation life 35 years      
Rentable square feet | 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 29      
Land and improvements, gross 0      
Buildings and improvements, gross 99,551      
Land and improvements and buildings and improvements, gross 99,551      
Accumulated depreciation $ 15,008      
Depreciation life 35 years      
Rentable square feet | 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 3,082      
Land and improvements, gross 0      
Buildings and improvements, gross 24,797      
Land and improvements and buildings and improvements, gross 24,797      
Accumulated depreciation $ 3,815      
Depreciation life 35 years      
Rentable square feet | 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 109,400      
Land and improvements, gross 18,063      
Buildings and improvements, gross 108,005      
Land and improvements and buildings and improvements, gross 126,068      
Accumulated depreciation $ 23,526      
Depreciation life 35 years      
Rentable square feet | 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 50,174      
Land and improvements, gross 8,626      
Buildings and improvements, gross 49,507      
Land and improvements and buildings and improvements, gross 58,133      
Accumulated depreciation $ 10,462      
Depreciation life 35 years      
Rentable square feet | 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 196,525      
Land and improvements, gross 85,510      
Buildings and improvements, gross 189,579      
Land and improvements and buildings and improvements, gross 275,089      
Accumulated depreciation $ 17,575      
Depreciation life 35 years      
Rentable square feet | 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 75,122      
Land and improvements, gross 49,150      
Buildings and improvements, gross 206,360      
Land and improvements and buildings and improvements, gross 255,510      
Accumulated depreciation $ 84,313      
Depreciation life 35 years      
Rentable square feet | 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 105,065      
Land and improvements, gross 63,550      
Buildings and improvements, gross 259,218      
Land and improvements and buildings and improvements, gross 322,768      
Accumulated depreciation $ 109,983      
Depreciation life 35 years      
Rentable square feet | 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 75,015      
Land and improvements, gross 19,260      
Buildings and improvements, gross 159,033      
Land and improvements and buildings and improvements, gross 178,293      
Accumulated depreciation $ 74,496      
Depreciation life 35 years      
Rentable square feet | 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 125,655      
Land and improvements, gross 28,504      
Buildings and improvements, gross 185,386      
Land and improvements and buildings and improvements, gross 213,890      
Accumulated depreciation $ 60,597      
Depreciation life 35 years      
Rentable square feet | ft² 429,796      
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 10,239      
Land and improvements, gross 7,630      
Buildings and improvements, gross 33,009      
Land and improvements and buildings and improvements, gross 40,639      
Accumulated depreciation $ 12,929      
Depreciation life 35 years      
Rentable square feet | 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 16,673      
Land and improvements, gross 5,910      
Buildings and improvements, gross 39,123      
Land and improvements and buildings and improvements, gross 45,033      
Accumulated depreciation $ 12,198      
Depreciation life 35 years      
Rentable square feet | 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 80,811      
Land and improvements, gross 18,645      
Buildings and improvements, gross 80,811      
Land and improvements and buildings and improvements, gross 99,456      
Accumulated depreciation $ 13,704      
Depreciation life 35 years      
Rentable square feet | 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 819      
Land and improvements, gross 29,403      
Buildings and improvements, gross 114,000      
Land and improvements and buildings and improvements, gross 143,403      
Accumulated depreciation $ 10,254      
Depreciation life 35 years      
Rentable square feet | 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 212,731      
Land and improvements, gross 52,815      
Buildings and improvements, gross 212,731      
Land and improvements and buildings and improvements, gross 265,546      
Accumulated depreciation $ 37,855      
Depreciation life 35 years      
Rentable square feet | 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 $ 2,279      
Depreciation life 35 years      
Rentable square feet | 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 $ 2,252      
Depreciation life 35 years      
Rentable square feet | 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 324      
Land and improvements, gross 23,112      
Buildings and improvements, gross 22,925      
Land and improvements and buildings and improvements, gross 46,037      
Accumulated depreciation $ 4,015      
Depreciation life 35 years      
Rentable square feet | 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 177,114      
Land and improvements, gross 23,719      
Buildings and improvements, gross 177,114      
Land and improvements and buildings and improvements, gross 200,833      
Accumulated depreciation $ 1,256      
Depreciation life 35 years      
Rentable square feet | 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 159,152      
Land and improvements, gross 23,449      
Buildings and improvements, gross 159,152      
Land and improvements and buildings and improvements, gross 182,601      
Accumulated depreciation $ 688      
Depreciation life 35 years      
Rentable square feet | 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 134,454      
Land and improvements, gross 19,538      
Buildings and improvements, gross 134,454      
Land and improvements and buildings and improvements, gross 153,992      
Accumulated depreciation $ 623      
Depreciation life 35 years      
Rentable square feet | 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 $ 10,707      
Depreciation life 35 years      
Rentable square feet | 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 $ 10,707      
Depreciation life 35 years      
Rentable square feet | 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 78      
Land and improvements, gross 13,538      
Buildings and improvements, gross 12,637      
Land and improvements and buildings and improvements, gross 26,175      
Accumulated depreciation $ 4,972      
Depreciation life 35 years      
Rentable square feet | 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 $ 23,795      
Depreciation life 35 years      
Rentable square feet | 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 84,890      
Land and improvements, gross 42,680      
Buildings and improvements, gross 256,305      
Land and improvements and buildings and improvements, gross 298,985      
Accumulated depreciation $ 98,849      
Depreciation life 35 years      
Rentable square feet | 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 50,023      
Land and improvements, gross 25,080      
Buildings and improvements, gross 200,900      
Land and improvements and buildings and improvements, gross 225,980      
Accumulated depreciation $ 71,570      
Depreciation life 35 years      
Rentable square feet | 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 32      
Land and improvements, gross 84,076      
Buildings and improvements, gross 371,186      
Land and improvements and buildings and improvements, gross 455,262      
Accumulated depreciation $ 3,608      
Depreciation life 35 years      
Rentable square feet | ft² 539,226      
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 8,906      
Land and improvements, gross 0      
Buildings and improvements, gross 56,933      
Land and improvements and buildings and improvements, gross 56,933      
Accumulated depreciation $ 20,516      
Depreciation life 35 years      
Rentable square feet | 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 21,179      
Land and improvements, gross 0      
Buildings and improvements, gross 79,716      
Land and improvements and buildings and improvements, gross 79,716      
Accumulated depreciation $ 23,312      
Depreciation life 35 years      
Rentable square feet | 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 6,314      
Land and improvements, gross 0      
Buildings and improvements, gross 43,718      
Land and improvements and buildings and improvements, gross 43,718      
Accumulated depreciation $ 14,545      
Depreciation life 35 years      
Rentable square feet | 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 14,747      
Land and improvements, gross 14,710      
Buildings and improvements, gross 96,765      
Land and improvements and buildings and improvements, gross 111,475      
Accumulated depreciation $ 26,804      
Depreciation life 35 years      
Rentable square feet | 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 10,633      
Land and improvements, gross 10,430      
Buildings and improvements, gross 70,636      
Land and improvements and buildings and improvements, gross 81,066      
Accumulated depreciation $ 20,627      
Depreciation life 35 years      
Rentable square feet | 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 13      
Land and improvements, gross 22,500      
Buildings and improvements, gross 77,059      
Land and improvements and buildings and improvements, gross 99,559      
Accumulated depreciation $ 20,457      
Depreciation life 35 years      
Rentable square feet | ft² 174,530      
333 Dexter Ave. North, South Lake Union, WA        
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 364,094      
Land and improvements, gross 42,854      
Buildings and improvements, gross 321,240      
Land and improvements and buildings and improvements, gross 364,094      
Accumulated depreciation $ 7,454      
Depreciation life 35 years      
Rentable square feet | ft² 0      
200 West 6th Street, 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 9,001      
Land and improvements, gross 0      
Buildings and improvements, gross 9,001      
Land and improvements and buildings and improvements, gross 9,001      
Accumulated depreciation $ 314      
Depreciation life 35 years      
Rentable square feet | ft² 0      
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 136,552      
Land and improvements, gross 16,970      
Buildings and improvements, gross 136,591      
Land and improvements and buildings and improvements, gross 153,561      
Accumulated depreciation $ 21,934      
Depreciation life 35 years      
Rentable square feet | 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 164,108      
Land and improvements, gross 12,112      
Buildings and improvements, gross 164,108      
Land and improvements and buildings and improvements, gross 176,220      
Accumulated depreciation $ 3,485      
Depreciation life 35 years      
Rentable square feet | 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 270,013      
Land and improvements, gross 106,419      
Buildings and improvements, gross 270,013      
Land and improvements and buildings and improvements, gross 376,432      
Accumulated depreciation $ 15,102      
Depreciation life 35 years      
Rentable square feet | ft² 0      
Operating Properties        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 249,023      
Initial cost, land and improvements 1,597,281      
Initial cost, buildings and Improvements 3,036,949      
Costs capitalized subsequent to acquisition/ improvement 4,641,337      
Land and improvements, gross 1,731,982      
Buildings and improvements, gross 7,543,585      
Land and improvements and buildings and improvements, gross 9,275,567      
Accumulated depreciation $ 2,003,656      
Rentable square feet | ft² 15,456,528      
Office Building | 12100, 12200 and 12312 W. Olympic Blvd., Los Angeles, CA        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances $ 163,435      
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 85,588      
Undeveloped land and construction in progress        
Real Estate and Accumulated Depreciation [Line Items]        
Initial cost, encumbrances 0      
Initial cost, land and improvements 883,621      
Initial cost, buildings and Improvements 0      
Costs capitalized subsequent to acquisition/ improvement 1,133,505      
Land and improvements, gross 883,621      
Buildings and improvements, gross 1,133,505      
Land and improvements and buildings and improvements, gross 2,017,126      
Accumulated depreciation $ 0      
Rentable square feet | ft² 0