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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Initial Cost        
Land $ 359,777      
Buildings and Improvements 2,527,685      
Net Improvements (Retirements) Since Acquisition 729,778      
Gross Amount Which Carried        
Land 403,998      
Buildings and Improvements 3,213,242      
Total 3,617,240 $ 3,472,602 $ 3,474,109 $ 4,006,459
Accumulated Depreciation at December 31, 2022 1,063,060 $ 957,450 $ 896,561 $ 973,318
PENNSYLVANIA SUBURBS | Six Tower Bridge (181 Washington Street)        
Initial Cost        
Land 6,927      
Buildings and Improvements 14,722      
Net Improvements (Retirements) Since Acquisition 1,176      
Gross Amount Which Carried        
Land 6,237      
Buildings and Improvements 16,588      
Total 22,825      
Accumulated Depreciation at December 31, 2022 4,604      
PENNSYLVANIA SUBURBS | 426 West Lancaster Avenue        
Initial Cost        
Land 1,689      
Buildings and Improvements 6,756      
Net Improvements (Retirements) Since Acquisition 9,405      
Gross Amount Which Carried        
Land 1,686      
Buildings and Improvements 16,164      
Total 17,850      
Accumulated Depreciation at December 31, 2022 2,727      
PENNSYLVANIA SUBURBS | 640 Freedom Business Center        
Initial Cost        
Land 1,015      
Buildings and Improvements 20,098      
Net Improvements (Retirements) Since Acquisition 4,603      
Gross Amount Which Carried        
Land 332      
Buildings and Improvements 25,384      
Total 25,716      
Accumulated Depreciation at December 31, 2022 16,544      
PENNSYLVANIA SUBURBS | 620 Freedom Business Center        
Initial Cost        
Land 666      
Buildings and Improvements 13,118      
Net Improvements (Retirements) Since Acquisition 2,372      
Gross Amount Which Carried        
Land 217      
Buildings and Improvements 15,939      
Total 16,156      
Accumulated Depreciation at December 31, 2022 10,154      
PENNSYLVANIA SUBURBS | 1000 First Avenue        
Initial Cost        
Land 0      
Buildings and Improvements 13,708      
Net Improvements (Retirements) Since Acquisition 2,971      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 16,679      
Total 16,679      
Accumulated Depreciation at December 31, 2022 12,521      
PENNSYLVANIA SUBURBS | 1060 First Avenue        
Initial Cost        
Land 0      
Buildings and Improvements 13,665      
Net Improvements (Retirements) Since Acquisition 3,979      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 17,644      
Total 17,644      
Accumulated Depreciation at December 31, 2022 12,989      
PENNSYLVANIA SUBURBS | 630 Freedom Business Center Drive        
Initial Cost        
Land 666      
Buildings and Improvements 13,251      
Net Improvements (Retirements) Since Acquisition 2,864      
Gross Amount Which Carried        
Land 219      
Buildings and Improvements 16,562      
Total 16,781      
Accumulated Depreciation at December 31, 2022 10,946      
PENNSYLVANIA SUBURBS | 1020 First Avenue        
Initial Cost        
Land 0      
Buildings and Improvements 10,744      
Net Improvements (Retirements) Since Acquisition 4,306      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 15,050      
Total 15,050      
Accumulated Depreciation at December 31, 2022 11,050      
PENNSYLVANIA SUBURBS | 1040 First Avenue        
Initial Cost        
Land 0      
Buildings and Improvements 14,142      
Net Improvements (Retirements) Since Acquisition 4,915      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 19,057      
Total 19,057      
Accumulated Depreciation at December 31, 2022 14,165      
PENNSYLVANIA SUBURBS | 610 Freedom Business Center Drive        
Initial Cost        
Land 485      
Buildings and Improvements 9,602      
Net Improvements (Retirements) Since Acquisition 2,289      
Gross Amount Which Carried        
Land 159      
Buildings and Improvements 12,217      
Total 12,376      
Accumulated Depreciation at December 31, 2022 8,256      
PENNSYLVANIA SUBURBS | 650 Park Avenue        
Initial Cost        
Land 1,916      
Buildings and Improvements 4,378      
Net Improvements (Retirements) Since Acquisition (4,378)      
Gross Amount Which Carried        
Land 1,916      
Buildings and Improvements 0      
Total 1,916      
Accumulated Depreciation at December 31, 2022 0      
PENNSYLVANIA SUBURBS | 600 Park Avenue        
Initial Cost        
Land 1,012      
Buildings and Improvements 4,048      
Net Improvements (Retirements) Since Acquisition 50      
Gross Amount Which Carried        
Land 1,012      
Buildings and Improvements 4,098      
Total 5,110      
Accumulated Depreciation at December 31, 2022 2,660      
PENNSYLVANIA SUBURBS | 933 First Avenue        
Initial Cost        
Land 3,127      
Buildings and Improvements 20,794      
Net Improvements (Retirements) Since Acquisition (1,125)      
Gross Amount Which Carried        
Land 3,127      
Buildings and Improvements 19,669      
Total 22,796      
Accumulated Depreciation at December 31, 2022 4,823      
PENNSYLVANIA SUBURBS | 500 North Gulph Road        
Initial Cost        
Land 1,303      
Buildings and Improvements 5,201      
Net Improvements (Retirements) Since Acquisition 21,471      
Gross Amount Which Carried        
Land 1,303      
Buildings and Improvements 26,672      
Total 27,975      
Accumulated Depreciation at December 31, 2022 4,690      
PENNSYLVANIA SUBURBS | 401 Plymouth Road        
Initial Cost        
Land 6,199      
Buildings and Improvements 16,131      
Net Improvements (Retirements) Since Acquisition 14,515      
Gross Amount Which Carried        
Land 6,199      
Buildings and Improvements 30,646      
Total 36,845      
Accumulated Depreciation at December 31, 2022 15,527      
PENNSYLVANIA SUBURBS | Metroplex (4000 Chemical Road)        
Initial Cost        
Land 4,373      
Buildings and Improvements 24,546      
Net Improvements (Retirements) Since Acquisition 5,554      
Gross Amount Which Carried        
Land 4,373      
Buildings and Improvements 30,100      
Total 34,473      
Accumulated Depreciation at December 31, 2022 9,860      
PENNSYLVANIA SUBURBS | 610 West Germantown Pike        
Initial Cost        
Land 3,651      
Buildings and Improvements 14,514      
Net Improvements (Retirements) Since Acquisition 5,461      
Gross Amount Which Carried        
Land 3,651      
Buildings and Improvements 19,975      
Total 23,626      
Accumulated Depreciation at December 31, 2022 10,440      
PENNSYLVANIA SUBURBS | 600 West Germantown Pike        
Initial Cost        
Land 3,652      
Buildings and Improvements 15,288      
Net Improvements (Retirements) Since Acquisition 4,035      
Gross Amount Which Carried        
Land 3,652      
Buildings and Improvements 19,323      
Total 22,975      
Accumulated Depreciation at December 31, 2022 9,682      
PENNSYLVANIA SUBURBS | 630 West Germantown Pike        
Initial Cost        
Land 3,558      
Buildings and Improvements 14,743      
Net Improvements (Retirements) Since Acquisition 3,169      
Gross Amount Which Carried        
Land 3,558      
Buildings and Improvements 17,912      
Total 21,470      
Accumulated Depreciation at December 31, 2022 9,015      
PENNSYLVANIA SUBURBS | 620 West Germantown Pike        
Initial Cost        
Land 3,572      
Buildings and Improvements 14,435      
Net Improvements (Retirements) Since Acquisition 4,131      
Gross Amount Which Carried        
Land 3,572      
Buildings and Improvements 18,566      
Total 22,138      
Accumulated Depreciation at December 31, 2022 8,409      
PENNSYLVANIA SUBURBS | 660 West Germantown Pike        
Initial Cost        
Land 3,694      
Buildings and Improvements 5,487      
Net Improvements (Retirements) Since Acquisition 19,502      
Gross Amount Which Carried        
Land 5,405      
Buildings and Improvements 23,278      
Total 28,683      
Accumulated Depreciation at December 31, 2022 8,467      
PENNSYLVANIA SUBURBS | 351 Plymouth Road        
Initial Cost        
Land 1,043      
Buildings and Improvements 555      
Net Improvements (Retirements) Since Acquisition 0      
Gross Amount Which Carried        
Land 1,043      
Buildings and Improvements 555      
Total 1,598      
Accumulated Depreciation at December 31, 2022 246      
PENNSYLVANIA SUBURBS | 150 Radnor Chester Road        
Initial Cost        
Land 11,925      
Buildings and Improvements 36,986      
Net Improvements (Retirements) Since Acquisition 21,691      
Gross Amount Which Carried        
Land 11,897      
Buildings and Improvements 58,705      
Total 70,602      
Accumulated Depreciation at December 31, 2022 26,556      
PENNSYLVANIA SUBURBS | One Radnor Corporate Center        
Initial Cost        
Land 7,323      
Buildings and Improvements 28,613      
Net Improvements (Retirements) Since Acquisition 14,397      
Gross Amount Which Carried        
Land 7,323      
Buildings and Improvements 43,010      
Total 50,333      
Accumulated Depreciation at December 31, 2022 27,920      
PENNSYLVANIA SUBURBS | 201 King of Prussia Road        
Initial Cost        
Land 8,956      
Buildings and Improvements 29,811      
Net Improvements (Retirements) Since Acquisition 4,196      
Gross Amount Which Carried        
Land 8,949      
Buildings and Improvements 34,014      
Total 42,963      
Accumulated Depreciation at December 31, 2022 22,515      
PENNSYLVANIA SUBURBS | 555 Lancaster Avenue        
Initial Cost        
Land 8,014      
Buildings and Improvements 16,508      
Net Improvements (Retirements) Since Acquisition 10,772      
Gross Amount Which Carried        
Land 8,609      
Buildings and Improvements 26,685      
Total 35,294      
Accumulated Depreciation at December 31, 2022 9,722      
PENNSYLVANIA SUBURBS | Four Radnor Corporate Center        
Initial Cost        
Land 5,406      
Buildings and Improvements 21,390      
Net Improvements (Retirements) Since Acquisition 10,499      
Gross Amount Which Carried        
Land 5,705      
Buildings and Improvements 31,590      
Total 37,295      
Accumulated Depreciation at December 31, 2022 18,534      
PENNSYLVANIA SUBURBS | Five Radnor Corporate Center        
Initial Cost        
Land 6,506      
Buildings and Improvements 25,525      
Net Improvements (Retirements) Since Acquisition 9,755      
Gross Amount Which Carried        
Land 6,578      
Buildings and Improvements 35,208      
Total 41,786      
Accumulated Depreciation at December 31, 2022 16,306      
PENNSYLVANIA SUBURBS | Three Radnor Corporate Center        
Initial Cost        
Land 4,773      
Buildings and Improvements 17,961      
Net Improvements (Retirements) Since Acquisition 1,788      
Gross Amount Which Carried        
Land 4,791      
Buildings and Improvements 19,731      
Total 24,522      
Accumulated Depreciation at December 31, 2022 11,768      
PENNSYLVANIA SUBURBS | Two Radnor Corporate Center        
Initial Cost        
Land 3,937      
Buildings and Improvements 15,484      
Net Improvements (Retirements) Since Acquisition 2,552      
Gross Amount Which Carried        
Land 3,942      
Buildings and Improvements 18,031      
Total 21,973      
Accumulated Depreciation at December 31, 2022 11,383      
PENNSYLVANIA SUBURBS | 130 Radnor Chester Road        
Initial Cost        
Land 2,573      
Buildings and Improvements 8,338      
Net Improvements (Retirements) Since Acquisition (258)      
Gross Amount Which Carried        
Land 2,567      
Buildings and Improvements 8,086      
Total 10,653      
Accumulated Depreciation at December 31, 2022 4,099      
PENNSYLVANIA SUBURBS | 170 Radnor Chester Road        
Initial Cost        
Land 2,514      
Buildings and Improvements 8,147      
Net Improvements (Retirements) Since Acquisition 2,008      
Gross Amount Which Carried        
Land 2,509      
Buildings and Improvements 10,160      
Total 12,669      
Accumulated Depreciation at December 31, 2022 5,366      
PENNSYLVANIA SUBURBS | 200 Radnor Chester Road        
Initial Cost        
Land 3,366      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 3,740      
Gross Amount Which Carried        
Land 3,366      
Buildings and Improvements 3,740      
Total 7,106      
Accumulated Depreciation at December 31, 2022 1,137      
PENNSYLVANIA SUBURBS | 101 West Elm Street        
Initial Cost        
Land 6,251      
Buildings and Improvements 25,209      
Net Improvements (Retirements) Since Acquisition 2,846      
Gross Amount Which Carried        
Land 6,251      
Buildings and Improvements 28,055      
Total 34,306      
Accumulated Depreciation at December 31, 2022 12,533      
PENNSYLVANIA SUBURBS | 1 West Elm Street        
Initial Cost        
Land 3,557      
Buildings and Improvements 14,249      
Net Improvements (Retirements) Since Acquisition 8,203      
Gross Amount Which Carried        
Land 3,557      
Buildings and Improvements 22,452      
Total 26,009      
Accumulated Depreciation at December 31, 2022 7,302      
PENNSYLVANIA SUBURBS | 250 King of Prussia Road        
Initial Cost        
Land 0      
Buildings and Improvements 20,566      
Net Improvements (Retirements) Since Acquisition 12,733      
Gross Amount Which Carried        
Land 976      
Buildings and Improvements 32,323      
Total 33,299      
Accumulated Depreciation at December 31, 2022 626      
PHILADELPHIA CBD | Cira Centre (2929 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 208,570      
Net Improvements (Retirements) Since Acquisition 23,843      
Gross Amount Which Carried        
Land 12,586      
Buildings and Improvements 219,827      
Total 232,413      
Accumulated Depreciation at December 31, 2022 73,510      
PHILADELPHIA CBD | Three Logan Square (1717 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 98,188      
Net Improvements (Retirements) Since Acquisition 86,126      
Gross Amount Which Carried        
Land 25,195      
Buildings and Improvements 159,119      
Total 184,314      
Accumulated Depreciation at December 31, 2022 61,247      
PHILADELPHIA CBD | One Logan Square (130 North 18th Street)        
Initial Cost        
Land 14,496      
Buildings and Improvements 107,736      
Net Improvements (Retirements) Since Acquisition 21,614      
Gross Amount Which Carried        
Land 14,473      
Buildings and Improvements 129,373      
Total 143,846      
Accumulated Depreciation at December 31, 2022 70,363      
PHILADELPHIA CBD | Two Logan Square (100 North 18th Street)        
Initial Cost        
Land 16,066      
Buildings and Improvements 100,255      
Net Improvements (Retirements) Since Acquisition 34,198      
Gross Amount Which Carried        
Land 16,066      
Buildings and Improvements 134,453      
Total 150,519      
Accumulated Depreciation at December 31, 2022 61,597      
PHILADELPHIA CBD | Cira Centre South Garage (129 South 30th Street)        
Initial Cost        
Land 0      
Buildings and Improvements 76,008      
Net Improvements (Retirements) Since Acquisition 26,970      
Gross Amount Which Carried        
Land 6,638      
Buildings and Improvements 96,340      
Total 102,978      
Accumulated Depreciation at December 31, 2022 27,789      
PHILADELPHIA CBD | 1900 Market Street        
Initial Cost        
Land 7,768      
Buildings and Improvements 17,263      
Net Improvements (Retirements) Since Acquisition 61,760      
Gross Amount Which Carried        
Land 7,768      
Buildings and Improvements 79,023      
Total 86,791      
Accumulated Depreciation at December 31, 2022 30,016      
PHILADELPHIA CBD | 3020 Market Street        
Initial Cost        
Land 0      
Buildings and Improvements 21,417      
Net Improvements (Retirements) Since Acquisition 7,442      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 28,859      
Total 28,859      
Accumulated Depreciation at December 31, 2022 13,904      
PHILADELPHIA CBD | 618-634 Market Street        
Initial Cost        
Land 13,365      
Buildings and Improvements 5,791      
Net Improvements (Retirements) Since Acquisition 5,180      
Gross Amount Which Carried        
Land 13,365      
Buildings and Improvements 10,971      
Total 24,336      
Accumulated Depreciation at December 31, 2022 7,222      
PHILADELPHIA CBD | FMC Tower at Cira Centre South (2929 Walnut Street)        
Initial Cost        
Land 0      
Buildings and Improvements 400,294      
Net Improvements (Retirements) Since Acquisition 10,689      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 410,983      
Total 410,983      
Accumulated Depreciation at December 31, 2022 85,826      
PHILADELPHIA CBD | 2100 Market Street        
Initial Cost        
Land 18,827      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 6,292      
Gross Amount Which Carried        
Land 18,854      
Buildings and Improvements 6,265      
Total 25,119      
Accumulated Depreciation at December 31, 2022 2,280      
PHILADELPHIA CBD | 1505-11 Race Street        
Initial Cost        
Land 3,662      
Buildings and Improvements 6,061      
Net Improvements (Retirements) Since Acquisition 8      
Gross Amount Which Carried        
Land 3,670      
Buildings and Improvements 6,061      
Total 9,731      
Accumulated Depreciation at December 31, 2022 328      
PHILADELPHIA CBD | 3000 Market Street        
Initial Cost        
Land 18,924      
Buildings and Improvements 13,080      
Net Improvements (Retirements) Since Acquisition 17,349      
Gross Amount Which Carried        
Land 18,924      
Buildings and Improvements 30,429      
Total 49,353      
Accumulated Depreciation at December 31, 2022 2,608      
PHILADELPHIA CBD | The Bulletin Building (3025 Market Street)        
Initial Cost        
Land 0      
Buildings and Improvements 24,377      
Net Improvements (Retirements) Since Acquisition 44,081      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 68,458      
Total 68,458      
Accumulated Depreciation at December 31, 2022 11,490      
PHILADELPHIA CBD | 3001-3003 JFK Boulevard        
Initial Cost        
Land 0      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 111      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 111      
Total 111      
Accumulated Depreciation at December 31, 2022 32      
METROPOLITAN WASHINGTON, D.C. | 6600 Rockledge Drive        
Initial Cost        
Land 0      
Buildings and Improvements 37,421      
Net Improvements (Retirements) Since Acquisition 7,672      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 45,093      
Total 45,093      
Accumulated Depreciation at December 31, 2022 17,099      
METROPOLITAN WASHINGTON, D.C. | 1676 International Drive        
Initial Cost        
Land 18,437      
Buildings and Improvements 97,538      
Net Improvements (Retirements) Since Acquisition 37,113      
Gross Amount Which Carried        
Land 18,785      
Buildings and Improvements 134,303      
Total 153,088      
Accumulated Depreciation at December 31, 2022 35,718      
METROPOLITAN WASHINGTON, D.C. | 8260 Greensboro Drive        
Initial Cost        
Land 7,952      
Buildings and Improvements 33,964      
Net Improvements (Retirements) Since Acquisition 8,645      
Gross Amount Which Carried        
Land 8,102      
Buildings and Improvements 42,459      
Total 50,561      
Accumulated Depreciation at December 31, 2022 14,217      
METROPOLITAN WASHINGTON, D.C. | 8521 Leesburg Pike        
Initial Cost        
Land 4,316      
Buildings and Improvements 30,885      
Net Improvements (Retirements) Since Acquisition (1,511)      
Gross Amount Which Carried        
Land 3,587      
Buildings and Improvements 30,103      
Total 33,690      
Accumulated Depreciation at December 31, 2022 12,032      
METROPOLITAN WASHINGTON, D.C. | Dabney Westwood        
Initial Cost        
Land 1,732      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 3,690      
Gross Amount Which Carried        
Land 819      
Buildings and Improvements 4,603      
Total 5,422      
Accumulated Depreciation at December 31, 2022 185      
AUSTIN, TX | 401-405 Colorado Street        
Initial Cost        
Land 0      
Buildings and Improvements 100,448      
Net Improvements (Retirements) Since Acquisition 564      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 101,012      
Total 101,012      
Accumulated Depreciation at December 31, 2022 2,728      
AUSTIN, TX | 11501 Burnet Road - Building 1        
Initial Cost        
Land 3,755      
Buildings and Improvements 22,702      
Net Improvements (Retirements) Since Acquisition 4      
Gross Amount Which Carried        
Land 3,755      
Buildings and Improvements 22,706      
Total 26,461      
Accumulated Depreciation at December 31, 2022 8,876      
AUSTIN, TX | 11501 Burnet Road - Building 2        
Initial Cost        
Land 2,732      
Buildings and Improvements 16,305      
Net Improvements (Retirements) Since Acquisition 1,473      
Gross Amount Which Carried        
Land 2,732      
Buildings and Improvements 17,778      
Total 20,510      
Accumulated Depreciation at December 31, 2022 7,422      
AUSTIN, TX | 11501 Burnet Road - Building 3        
Initial Cost        
Land 3,688      
Buildings and Improvements 22,348      
Net Improvements (Retirements) Since Acquisition 6,421      
Gross Amount Which Carried        
Land 3,688      
Buildings and Improvements 28,769      
Total 32,457      
Accumulated Depreciation at December 31, 2022 9,372      
AUSTIN, TX | 11501 Burnet Road - Building 4        
Initial Cost        
Land 2,614      
Buildings and Improvements 15,740      
Net Improvements (Retirements) Since Acquisition 3      
Gross Amount Which Carried        
Land 2,614      
Buildings and Improvements 15,743      
Total 18,357      
Accumulated Depreciation at December 31, 2022 6,153      
AUSTIN, TX | 11501 Burnet Road - Building 5        
Initial Cost        
Land 3,689      
Buildings and Improvements 22,354      
Net Improvements (Retirements) Since Acquisition 4      
Gross Amount Which Carried        
Land 3,689      
Buildings and Improvements 22,358      
Total 26,047      
Accumulated Depreciation at December 31, 2022 8,740      
AUSTIN, TX | 11501 Burnet Road - Building 6        
Initial Cost        
Land 2,676      
Buildings and Improvements 15,972      
Net Improvements (Retirements) Since Acquisition 13,855      
Gross Amount Which Carried        
Land 2,676      
Buildings and Improvements 29,827      
Total 32,503      
Accumulated Depreciation at December 31, 2022 12,555      
AUSTIN, TX | 11501 Burnet Road - Building 8        
Initial Cost        
Land 1,400      
Buildings and Improvements 7,422      
Net Improvements (Retirements) Since Acquisition 1,776      
Gross Amount Which Carried        
Land 1,400      
Buildings and Improvements 9,198      
Total 10,598      
Accumulated Depreciation at December 31, 2022 3,594      
AUSTIN, TX | 11501 Burnet Road - Parking Garage        
Initial Cost        
Land 0      
Buildings and Improvements 19,826      
Net Improvements (Retirements) Since Acquisition 1,538      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 21,364      
Total 21,364      
Accumulated Depreciation at December 31, 2022 8,740      
AUSTIN, TX | Four Points Centre 3, 11120 Four Points Drive        
Initial Cost        
Land 1,140      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 40,322      
Gross Amount Which Carried        
Land 1,141      
Buildings and Improvements 40,321      
Total 41,462      
Accumulated Depreciation at December 31, 2022 6,849      
AUSTIN, TX | One Barton Skyway (1501 South MoPac Expressway)        
Initial Cost        
Land 10,496      
Buildings and Improvements 47,670      
Net Improvements (Retirements) Since Acquisition 7,970      
Gross Amount Which Carried        
Land 10,495      
Buildings and Improvements 55,641      
Total 66,136      
Accumulated Depreciation at December 31, 2022 6,565      
AUSTIN, TX | Two Barton Skyway (1601 South MoPac Expressway)        
Initial Cost        
Land 10,849      
Buildings and Improvements 53,868      
Net Improvements (Retirements) Since Acquisition 3,889      
Gross Amount Which Carried        
Land 10,848      
Buildings and Improvements 57,758      
Total 68,606      
Accumulated Depreciation at December 31, 2022 7,271      
AUSTIN, TX | Three Barton Skyway (1221 South MoPac Expressway)        
Initial Cost        
Land 10,374      
Buildings and Improvements 47,624      
Net Improvements (Retirements) Since Acquisition 1,027      
Gross Amount Which Carried        
Land 10,373      
Buildings and Improvements 48,652      
Total 59,025      
Accumulated Depreciation at December 31, 2022 5,158      
AUSTIN, TX | Four Barton Skyway (1301 South MoPac Expressway)        
Initial Cost        
Land 13,301      
Buildings and Improvements 57,041      
Net Improvements (Retirements) Since Acquisition 7,611      
Gross Amount Which Carried        
Land 13,300      
Buildings and Improvements 64,653      
Total 77,953      
Accumulated Depreciation at December 31, 2022 7,096      
AUSTIN, TX | Four Points Centre (11305 Four Points Drive)        
Initial Cost        
Land 7,800      
Buildings and Improvements 43,581      
Net Improvements (Retirements) Since Acquisition 4,515      
Gross Amount Which Carried        
Land 7,800      
Buildings and Improvements 48,096      
Total 55,896      
Accumulated Depreciation at December 31, 2022 6,275      
AUSTIN, TX | River Place - Building 1 (6500 River Place Boulevard)        
Initial Cost        
Land 2,004      
Buildings and Improvements 17,680      
Net Improvements (Retirements) Since Acquisition 562      
Gross Amount Which Carried        
Land 2,004      
Buildings and Improvements 18,242      
Total 20,246      
Accumulated Depreciation at December 31, 2022 2,189      
AUSTIN, TX | River Place - Building 2 (6500 River Place Boulevard)        
Initial Cost        
Land 3,137      
Buildings and Improvements 29,254      
Net Improvements (Retirements) Since Acquisition 806      
Gross Amount Which Carried        
Land 3,137      
Buildings and Improvements 30,060      
Total 33,197      
Accumulated Depreciation at December 31, 2022 3,432      
AUSTIN, TX | River Place - Building 3 (6500 River Place Boulevard)        
Initial Cost        
Land 3,064      
Buildings and Improvements 26,705      
Net Improvements (Retirements) Since Acquisition 447      
Gross Amount Which Carried        
Land 3,064      
Buildings and Improvements 27,152      
Total 30,216      
Accumulated Depreciation at December 31, 2022 2,931      
AUSTIN, TX | River Place - Building 4 (6500 River Place Boulevard        
Initial Cost        
Land 2,273      
Buildings and Improvements 18,617      
Net Improvements (Retirements) Since Acquisition 1,716      
Gross Amount Which Carried        
Land 2,273      
Buildings and Improvements 20,333      
Total 22,606      
Accumulated Depreciation at December 31, 2022 2,903      
AUSTIN, TX | River Place - Building 5 (6500 River Place Boulevard)        
Initial Cost        
Land 1,752      
Buildings and Improvements 14,315      
Net Improvements (Retirements) Since Acquisition 692      
Gross Amount Which Carried        
Land 1,752      
Buildings and Improvements 15,007      
Total 16,759      
Accumulated Depreciation at December 31, 2022 1,655      
AUSTIN, TX | River Place - Building 6 (6500 River Place Boulevard)        
Initial Cost        
Land 1,598      
Buildings and Improvements 12,945      
Net Improvements (Retirements) Since Acquisition 703      
Gross Amount Which Carried        
Land 1,598      
Buildings and Improvements 13,648      
Total 15,246      
Accumulated Depreciation at December 31, 2022 1,490      
AUSTIN, TX | River Place - Building 7 (6500 River Place Boulevard)        
Initial Cost        
Land 1,801      
Buildings and Improvements 16,486      
Net Improvements (Retirements) Since Acquisition 1,208      
Gross Amount Which Carried        
Land 1,801      
Buildings and Improvements 17,694      
Total 19,495      
Accumulated Depreciation at December 31, 2022 2,468      
AUSTIN, TX | Quarry Lake II (4516 Seton Center Parkway)        
Initial Cost        
Land 3,970      
Buildings and Improvements 30,546      
Net Improvements (Retirements) Since Acquisition 1,174      
Gross Amount Which Carried        
Land 3,867      
Buildings and Improvements 31,823      
Total 35,690      
Accumulated Depreciation at December 31, 2022 3,611      
OTHER | Main Street-Plaza 1000        
Initial Cost        
Land 2,732      
Buildings and Improvements 10,942      
Net Improvements (Retirements) Since Acquisition 284      
Gross Amount Which Carried        
Land 2,732      
Buildings and Improvements 11,226      
Total 13,958      
Accumulated Depreciation at December 31, 2022 11,054      
OTHER | Main Street-Piazza        
Initial Cost        
Land 696      
Buildings and Improvements 2,802      
Net Improvements (Retirements) Since Acquisition 3,586      
Gross Amount Which Carried        
Land 704      
Buildings and Improvements 6,380      
Total 7,084      
Accumulated Depreciation at December 31, 2022 4,547      
OTHER | Main Street-Promenade        
Initial Cost        
Land 532      
Buildings and Improvements 2,052      
Net Improvements (Retirements) Since Acquisition 311      
Gross Amount Which Carried        
Land 532      
Buildings and Improvements 2,363      
Total 2,895      
Accumulated Depreciation at December 31, 2022 1,561      
OTHER | 920 North King Street        
Initial Cost        
Land 6,141      
Buildings and Improvements 21,140      
Net Improvements (Retirements) Since Acquisition 7,108      
Gross Amount Which Carried        
Land 6,141      
Buildings and Improvements 28,248      
Total 34,389      
Accumulated Depreciation at December 31, 2022 16,427      
OTHER | 300 Delaware Avenue        
Initial Cost        
Land 6,369      
Buildings and Improvements 13,739      
Net Improvements (Retirements) Since Acquisition 2,750      
Gross Amount Which Carried        
Land 6,369      
Buildings and Improvements 16,489      
Total 22,858      
Accumulated Depreciation at December 31, 2022 $ 10,393