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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Initial Cost        
Land $ 365,011      
Buildings and Improvements 2,472,362      
Net Improvements (Retirements) Since Acquisition 635,229      
Gross Amount Which Carried        
Land 410,144      
Buildings and Improvements 3,062,458      
Total 3,472,602 $ 3,474,109 $ 4,006,459 $ 3,951,719
Accumulated Depreciation at December 31, 2021 957,450 896,561 $ 973,318 $ 885,407
Pennsylvania Suburbs | Six Tower Bridge (181 Washington Street)        
Initial Cost        
Land   6,927    
Buildings and Improvements   14,722    
Net Improvements (Retirements) Since Acquisition   1,747    
Gross Amount Which Carried        
Land   6,237    
Buildings and Improvements   17,159    
Total   23,396    
Accumulated Depreciation at December 31, 2021   4,436    
Pennsylvania Suburbs | 426 West Lancaster Avenue        
Initial Cost        
Land   1,689    
Buildings and Improvements   6,756    
Net Improvements (Retirements) Since Acquisition   9,400    
Gross Amount Which Carried        
Land   1,686    
Buildings and Improvements   16,159    
Total   17,845    
Accumulated Depreciation at December 31, 2021   1,614    
Pennsylvania Suburbs | 640 Freedom Business Center        
Initial Cost        
Land   1,015    
Buildings and Improvements   20,098    
Net Improvements (Retirements) Since Acquisition   4,252    
Gross Amount Which Carried        
Land   360    
Buildings and Improvements   25,005    
Total   25,365    
Accumulated Depreciation at December 31, 2021   15,445    
Pennsylvania Suburbs | 620 Freedom Business Center        
Initial Cost        
Land   666    
Buildings and Improvements   13,118    
Net Improvements (Retirements) Since Acquisition   1,498    
Gross Amount Which Carried        
Land   234    
Buildings and Improvements   15,048    
Total   15,282    
Accumulated Depreciation at December 31, 2021   9,596    
Pennsylvania Suburbs | 1000 First Avenue        
Initial Cost        
Land   0    
Buildings and Improvements   13,708    
Net Improvements (Retirements) Since Acquisition   2,806    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   16,514    
Total   16,514    
Accumulated Depreciation at December 31, 2021   11,778    
Pennsylvania Suburbs | 1060 First Avenue        
Initial Cost        
Land   0    
Buildings and Improvements   13,665    
Net Improvements (Retirements) Since Acquisition   4,014    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   17,679    
Total   17,679    
Accumulated Depreciation at December 31, 2021   12,249    
Pennsylvania Suburbs | 630 Freedom Business Center Drive        
Initial Cost        
Land   666    
Buildings and Improvements   13,251    
Net Improvements (Retirements) Since Acquisition   2,937    
Gross Amount Which Carried        
Land   237    
Buildings and Improvements   16,617    
Total   16,854    
Accumulated Depreciation at December 31, 2021   10,322    
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, 2021   10,380    
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, 2021   13,367    
Pennsylvania Suburbs | 610 Freedom Business Center Drive        
Initial Cost        
Land   485    
Buildings and Improvements   9,602    
Net Improvements (Retirements) Since Acquisition   2,415    
Gross Amount Which Carried        
Land   172    
Buildings and Improvements   12,330    
Total   12,502    
Accumulated Depreciation at December 31, 2021   8,007    
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, 2021   0    
Pennsylvania Suburbs | 600 Park Avenue        
Initial Cost        
Land   1,012    
Buildings and Improvements   4,048    
Net Improvements (Retirements) Since Acquisition   385    
Gross Amount Which Carried        
Land   1,012    
Buildings and Improvements   4,433    
Total   5,445    
Accumulated Depreciation at December 31, 2021   2,888    
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, 2021   3,954    
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, 2021   3,526    
Pennsylvania Suburbs | 401 Plymouth Road        
Initial Cost        
Land   6,199    
Buildings and Improvements   16,131    
Net Improvements (Retirements) Since Acquisition   15,622    
Gross Amount Which Carried        
Land   6,199    
Buildings and Improvements   31,753    
Total   37,952    
Accumulated Depreciation at December 31, 2021   16,559    
Pennsylvania Suburbs | Metroplex (4000 Chemical Road)        
Initial Cost        
Land   4,373    
Buildings and Improvements   24,546    
Net Improvements (Retirements) Since Acquisition   5,498    
Gross Amount Which Carried        
Land   4,373    
Buildings and Improvements   30,044    
Total   34,417    
Accumulated Depreciation at December 31, 2021   8,667    
Pennsylvania Suburbs | 610 West Germantown Pike        
Initial Cost        
Land   3,651    
Buildings and Improvements   14,514    
Net Improvements (Retirements) Since Acquisition   4,493    
Gross Amount Which Carried        
Land   3,651    
Buildings and Improvements   19,007    
Total   22,658    
Accumulated Depreciation at December 31, 2021   9,635    
Pennsylvania Suburbs | 600 West Germantown Pike        
Initial Cost        
Land   3,652    
Buildings and Improvements   15,288    
Net Improvements (Retirements) Since Acquisition   2,692    
Gross Amount Which Carried        
Land   3,652    
Buildings and Improvements   17,980    
Total   21,632    
Accumulated Depreciation at December 31, 2021   8,989    
Pennsylvania Suburbs | 630 West Germantown Pike        
Initial Cost        
Land   3,558    
Buildings and Improvements   14,743    
Net Improvements (Retirements) Since Acquisition   2,221    
Gross Amount Which Carried        
Land   3,558    
Buildings and Improvements   16,964    
Total   20,522    
Accumulated Depreciation at December 31, 2021   8,623    
Pennsylvania Suburbs | 620 West Germantown Pike        
Initial Cost        
Land   3,572    
Buildings and Improvements   14,435    
Net Improvements (Retirements) Since Acquisition   2,541    
Gross Amount Which Carried        
Land   3,572    
Buildings and Improvements   16,976    
Total   20,548    
Accumulated Depreciation at December 31, 2021   7,992    
Pennsylvania Suburbs | 660 West Germantown Pike        
Initial Cost        
Land   3,694    
Buildings and Improvements   5,487    
Net Improvements (Retirements) Since Acquisition   19,473    
Gross Amount Which Carried        
Land   5,405    
Buildings and Improvements   23,249    
Total   28,654    
Accumulated Depreciation at December 31, 2021   7,549    
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, 2021   232    
Pennsylvania Suburbs | 150 Radnor Chester Road        
Initial Cost        
Land   11,925    
Buildings and Improvements   36,986    
Net Improvements (Retirements) Since Acquisition   21,940    
Gross Amount Which Carried        
Land   11,897    
Buildings and Improvements   58,954    
Total   70,851    
Accumulated Depreciation at December 31, 2021   23,715    
Pennsylvania Suburbs | One Radnor Corporate Center        
Initial Cost        
Land   7,323    
Buildings and Improvements   28,613    
Net Improvements (Retirements) Since Acquisition   18,811    
Gross Amount Which Carried        
Land   7,323    
Buildings and Improvements   47,424    
Total   54,747    
Accumulated Depreciation at December 31, 2021   33,343    
Pennsylvania Suburbs | 201 King of Prussia Road        
Initial Cost        
Land   8,956    
Buildings and Improvements   29,811    
Net Improvements (Retirements) Since Acquisition   4,816    
Gross Amount Which Carried        
Land   8,949    
Buildings and Improvements   34,634    
Total   43,583    
Accumulated Depreciation at December 31, 2021   22,224    
Pennsylvania Suburbs | 555 Lancaster Avenue        
Initial Cost        
Land   8,014    
Buildings and Improvements   16,508    
Net Improvements (Retirements) Since Acquisition   10,137    
Gross Amount Which Carried        
Land   8,609    
Buildings and Improvements   26,050    
Total   34,659    
Accumulated Depreciation at December 31, 2021   11,546    
Pennsylvania Suburbs | Four Radnor Corporate Center        
Initial Cost        
Land   5,406    
Buildings and Improvements   21,390    
Net Improvements (Retirements) Since Acquisition   11,094    
Gross Amount Which Carried        
Land   5,705    
Buildings and Improvements   32,185    
Total   37,890    
Accumulated Depreciation at December 31, 2021   17,219    
Pennsylvania Suburbs | Five Radnor Corporate Center        
Initial Cost        
Land   6,506    
Buildings and Improvements   25,525    
Net Improvements (Retirements) Since Acquisition   8,682    
Gross Amount Which Carried        
Land   6,578    
Buildings and Improvements   34,135    
Total   40,713    
Accumulated Depreciation at December 31, 2021   15,124    
Pennsylvania Suburbs | Three Radnor Corporate Center        
Initial Cost        
Land   4,773    
Buildings and Improvements   17,961    
Net Improvements (Retirements) Since Acquisition   2,016    
Gross Amount Which Carried        
Land   4,791    
Buildings and Improvements   19,959    
Total   24,750    
Accumulated Depreciation at December 31, 2021   11,401    
Pennsylvania Suburbs | Two Radnor Corporate Center        
Initial Cost        
Land   3,937    
Buildings and Improvements   15,484    
Net Improvements (Retirements) Since Acquisition   2,685    
Gross Amount Which Carried        
Land   3,942    
Buildings and Improvements   18,164    
Total   22,106    
Accumulated Depreciation at December 31, 2021   11,120    
Pennsylvania Suburbs | 130 Radnor Chester Road        
Initial Cost        
Land   2,573    
Buildings and Improvements   8,338    
Net Improvements (Retirements) Since Acquisition   (134)    
Gross Amount Which Carried        
Land   2,567    
Buildings and Improvements   8,210    
Total   10,777    
Accumulated Depreciation at December 31, 2021   3,997    
Pennsylvania Suburbs | 170 Radnor Chester Road        
Initial Cost        
Land   2,514    
Buildings and Improvements   8,147    
Net Improvements (Retirements) Since Acquisition   1,667    
Gross Amount Which Carried        
Land   2,509    
Buildings and Improvements   9,819    
Total   12,328    
Accumulated Depreciation at December 31, 2021   5,138    
Pennsylvania Suburbs | 200 Radnor Chester Road        
Initial Cost        
Land   3,366    
Buildings and Improvements   0    
Net Improvements (Retirements) Since Acquisition   3,621    
Gross Amount Which Carried        
Land   3,366    
Buildings and Improvements   3,621    
Total   6,987    
Accumulated Depreciation at December 31, 2021   995    
Pennsylvania Suburbs | 101 West Elm Street        
Initial Cost        
Land   6,251    
Buildings and Improvements   25,209    
Net Improvements (Retirements) Since Acquisition   3,057    
Gross Amount Which Carried        
Land   6,251    
Buildings and Improvements   28,266    
Total   34,517    
Accumulated Depreciation at December 31, 2021   11,729    
Pennsylvania Suburbs | 1 West Elm Street        
Initial Cost        
Land   3,557    
Buildings and Improvements   14,249    
Net Improvements (Retirements) Since Acquisition   7,712    
Gross Amount Which Carried        
Land   3,557    
Buildings and Improvements   21,961    
Total   25,518    
Accumulated Depreciation at December 31, 2021   6,723    
Pennsylvania Suburbs | Four Tower Bridge (200 Barr Harbor Drive)        
Initial Cost        
Land   6,000    
Buildings and Improvements   14,734    
Net Improvements (Retirements) Since Acquisition   402    
Gross Amount Which Carried        
Land   6,000    
Buildings and Improvements   15,136    
Total   21,136    
Accumulated Depreciation at December 31, 2021   $ 1,650    
Philadelphia CBD | Cira Centre (2929 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 208,570      
Net Improvements (Retirements) Since Acquisition (22,427)      
Gross Amount Which Carried        
Land 12,586      
Buildings and Improvements 173,557      
Total 186,143      
Accumulated Depreciation at December 31, 2021 67,765      
Philadelphia CBD | Three Logan Square (1717 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 98,188      
Net Improvements (Retirements) Since Acquisition 84,992      
Gross Amount Which Carried        
Land 25,195      
Buildings and Improvements 157,985      
Total 183,180      
Accumulated Depreciation at December 31, 2021 54,136      
Philadelphia CBD | One Logan Square (130 North 18th Street)        
Initial Cost        
Land 14,496      
Buildings and Improvements 107,736      
Net Improvements (Retirements) Since Acquisition 21,633      
Gross Amount Which Carried        
Land 14,473      
Buildings and Improvements 129,392      
Total 143,865      
Accumulated Depreciation at December 31, 2021 65,373      
Philadelphia CBD | Two Logan Square (100 North 18th Street)        
Initial Cost        
Land 16,066      
Buildings and Improvements 100,255      
Net Improvements (Retirements) Since Acquisition 26,795      
Gross Amount Which Carried        
Land 16,066      
Buildings and Improvements 127,050      
Total 143,116      
Accumulated Depreciation at December 31, 2021 56,054      
Philadelphia CBD | Cira Centre South Garage (129 South 30th Street)        
Initial Cost        
Land 0      
Buildings and Improvements 76,008      
Net Improvements (Retirements) Since Acquisition 26,885      
Gross Amount Which Carried        
Land 6,727      
Buildings and Improvements 96,166      
Total 102,893      
Accumulated Depreciation at December 31, 2021 25,080      
Philadelphia CBD | 1900 Market Street        
Initial Cost        
Land 7,768      
Buildings and Improvements 17,263      
Net Improvements (Retirements) Since Acquisition 61,783      
Gross Amount Which Carried        
Land 7,768      
Buildings and Improvements 79,046      
Total 86,814      
Accumulated Depreciation at December 31, 2021 25,142      
Philadelphia CBD | 3020 Market Street        
Initial Cost        
Land 0      
Buildings and Improvements 21,417      
Net Improvements (Retirements) Since Acquisition 7,751      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 29,168      
Total 29,168      
Accumulated Depreciation at December 31, 2021 12,800      
Philadelphia CBD | 618-634 Market Street        
Initial Cost        
Land 13,365      
Buildings and Improvements 5,791      
Net Improvements (Retirements) Since Acquisition 5,186      
Gross Amount Which Carried        
Land 13,365      
Buildings and Improvements 10,977      
Total 24,342      
Accumulated Depreciation at December 31, 2021 6,821      
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 9,493      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 409,787      
Total 409,787      
Accumulated Depreciation at December 31, 2021 70,803      
Philadelphia CBD | 2100 Market Street        
Initial Cost        
Land 18,827      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 6,300      
Gross Amount Which Carried        
Land 18,854      
Buildings and Improvements 6,273      
Total 25,127      
Accumulated Depreciation at December 31, 2021 1,858      
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, 2021 177      
Philadelphia CBD | 3000 Market Street        
Initial Cost        
Land 18,924      
Buildings and Improvements 13,080      
Net Improvements (Retirements) Since Acquisition 16,264      
Gross Amount Which Carried        
Land 18,924      
Buildings and Improvements 29,344      
Total 48,268      
Accumulated Depreciation at December 31, 2021 504      
Philadelphia CBD | The Bulletin Building (3025 Market Street)        
Initial Cost        
Land 0      
Buildings and Improvements 24,377      
Net Improvements (Retirements) Since Acquisition 43,599      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 67,976      
Total 67,976      
Accumulated Depreciation at December 31, 2021 7,928      
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, 2021 24      
Metropolitan Washington, D.C. | 6600 Rockledge Drive        
Initial Cost        
Land 0      
Buildings and Improvements 37,421      
Net Improvements (Retirements) Since Acquisition 9,956      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 47,377      
Total 47,377      
Accumulated Depreciation at December 31, 2021 17,816      
Metropolitan Washington, D.C. | 1676 International Drive        
Initial Cost        
Land 18,437      
Buildings and Improvements 97,538      
Net Improvements (Retirements) Since Acquisition 25,740      
Gross Amount Which Carried        
Land 18,785      
Buildings and Improvements 122,930      
Total 141,715      
Accumulated Depreciation at December 31, 2021 31,083      
Metropolitan Washington, D.C. | 8260 Greensboro Drive        
Initial Cost        
Land 7,952      
Buildings and Improvements 33,964      
Net Improvements (Retirements) Since Acquisition 8,114      
Gross Amount Which Carried        
Land 8,102      
Buildings and Improvements 41,928      
Total 50,030      
Accumulated Depreciation at December 31, 2021 13,598      
Metropolitan Washington, D.C. | 8521 Leesburg Pike        
Initial Cost        
Land 4,316      
Buildings and Improvements 30,885      
Net Improvements (Retirements) Since Acquisition 6,575      
Gross Amount Which Carried        
Land 4,397      
Buildings and Improvements 37,379      
Total 41,776      
Accumulated Depreciation at December 31, 2021 14,332      
Austin, Texas | 401-405 Colorado Street        
Initial Cost        
Land 0      
Buildings and Improvements 47,132      
Net Improvements (Retirements) Since Acquisition 0      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 47,132      
Total 47,132      
Accumulated Depreciation at December 31, 2021 491      
Austin, Texas | 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, 2021 6,062      
Austin, Texas | 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, 2021 5,252      
Austin, Texas | 11501 Burnet Road - Building 3        
Initial Cost        
Land 3,688      
Buildings and Improvements 22,348      
Net Improvements (Retirements) Since Acquisition (1,510)      
Gross Amount Which Carried        
Land 3,688      
Buildings and Improvements 20,838      
Total 24,526      
Accumulated Depreciation at December 31, 2021 5,560      
Austin, Texas | 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, 2021 4,203      
Austin, Texas | 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, 2021 5,970      
Austin, Texas | 11501 Burnet Road - Building 6        
Initial Cost        
Land 2,676      
Buildings and Improvements 15,972      
Net Improvements (Retirements) Since Acquisition 13,964      
Gross Amount Which Carried        
Land 2,676      
Buildings and Improvements 29,936      
Total 32,612      
Accumulated Depreciation at December 31, 2021 8,808      
Austin, Texas | 11501 Burnet Road - Building 8        
Initial Cost        
Land 1,400      
Buildings and Improvements 7,422      
Net Improvements (Retirements) Since Acquisition 1,521      
Gross Amount Which Carried        
Land 1,400      
Buildings and Improvements 8,943      
Total 10,343      
Accumulated Depreciation at December 31, 2021 2,452      
Austin, Texas | 11501 Burnet Road - Parking Garage        
Initial Cost        
Land 0      
Buildings and Improvements 19,826      
Net Improvements (Retirements) Since Acquisition 3      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 19,829      
Total 19,829      
Accumulated Depreciation at December 31, 2021 6,289      
Austin, Texas | 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, 2021 5,062      
Austin, Texas | One Barton Skyway (1501 South MoPac Expressway)        
Initial Cost        
Land 10,496      
Buildings and Improvements 47,670      
Net Improvements (Retirements) Since Acquisition 5,421      
Gross Amount Which Carried        
Land 10,495      
Buildings and Improvements 53,092      
Total 63,587      
Accumulated Depreciation at December 31, 2021 4,697      
Austin, Texas | Two Barton Skyway (1601 South MoPac Expressway)        
Initial Cost        
Land 10,849      
Buildings and Improvements 53,868      
Net Improvements (Retirements) Since Acquisition 3,454      
Gross Amount Which Carried        
Land 10,848      
Buildings and Improvements 57,323      
Total 68,171      
Accumulated Depreciation at December 31, 2021 5,390      
Austin, Texas | Three Barton Skyway (1221 South MoPac Expressway)        
Initial Cost        
Land 10,374      
Buildings and Improvements 47,624      
Net Improvements (Retirements) Since Acquisition 286      
Gross Amount Which Carried        
Land 10,373      
Buildings and Improvements 47,911      
Total 58,284      
Accumulated Depreciation at December 31, 2021 3,865      
Austin, Texas | Four Barton Skyway (1301 South MoPac Expressway)        
Initial Cost        
Land 13,301      
Buildings and Improvements 57,041      
Net Improvements (Retirements) Since Acquisition 4,060      
Gross Amount Which Carried        
Land 13,300      
Buildings and Improvements 61,102      
Total 74,402      
Accumulated Depreciation at December 31, 2021 5,044      
Austin, Texas | Four Points Centre (11305 Four Points Drive)        
Initial Cost        
Land 7,800      
Buildings and Improvements 43,581      
Net Improvements (Retirements) Since Acquisition 3,981      
Gross Amount Which Carried        
Land 7,800      
Buildings and Improvements 47,562      
Total 55,362      
Accumulated Depreciation at December 31, 2021 4,640      
Austin, Texas | River Place - Building 1 (6500 River Place Boulevard)        
Initial Cost        
Land 2,004      
Buildings and Improvements 17,680      
Net Improvements (Retirements) Since Acquisition 547      
Gross Amount Which Carried        
Land 2,004      
Buildings and Improvements 18,227      
Total 20,231      
Accumulated Depreciation at December 31, 2021 1,624      
Austin, Texas | River Place - Building 2 (6500 River Place Boulevard)        
Initial Cost        
Land 3,137      
Buildings and Improvements 29,254      
Net Improvements (Retirements) Since Acquisition 675      
Gross Amount Which Carried        
Land 3,137      
Buildings and Improvements 29,929      
Total 33,066      
Accumulated Depreciation at December 31, 2021 2,490      
Austin, Texas | River Place - Building 3 (6500 River Place Boulevard)        
Initial Cost        
Land 3,064      
Buildings and Improvements 26,705      
Net Improvements (Retirements) Since Acquisition 294      
Gross Amount Which Carried        
Land 3,064      
Buildings and Improvements 26,999      
Total 30,063      
Accumulated Depreciation at December 31, 2021 2,164      
Austin, Texas | River Place - Building 4 (6500 River Place Boulevard        
Initial Cost        
Land 2,273      
Buildings and Improvements 18,617      
Net Improvements (Retirements) Since Acquisition 1,141      
Gross Amount Which Carried        
Land 2,273      
Buildings and Improvements 19,758      
Total 22,031      
Accumulated Depreciation at December 31, 2021 2,030      
Austin, Texas | River Place - Building 5 (6500 River Place Boulevard)        
Initial Cost        
Land 1,752      
Buildings and Improvements 14,315      
Net Improvements (Retirements) Since Acquisition 106      
Gross Amount Which Carried        
Land 1,752      
Buildings and Improvements 14,421      
Total 16,173      
Accumulated Depreciation at December 31, 2021 1,161      
Austin, Texas | River Place - Building 6 (6500 River Place Boulevard)        
Initial Cost        
Land 1,598      
Buildings and Improvements 12,945      
Net Improvements (Retirements) Since Acquisition 30      
Gross Amount Which Carried        
Land 1,598      
Buildings and Improvements 12,975      
Total 14,573      
Accumulated Depreciation at December 31, 2021 1,027      
Austin, Texas | River Place - Building 7 (6500 River Place Boulevard)        
Initial Cost        
Land 1,801      
Buildings and Improvements 16,486      
Net Improvements (Retirements) Since Acquisition 1,103      
Gross Amount Which Carried        
Land 1,801      
Buildings and Improvements 17,589      
Total 19,390      
Accumulated Depreciation at December 31, 2021 1,837      
Austin, Texas | Quarry Lake II (4516 Seton Center Parkway)        
Initial Cost        
Land 3,970      
Buildings and Improvements 30,546      
Net Improvements (Retirements) Since Acquisition 1,024      
Gross Amount Which Carried        
Land 3,867      
Buildings and Improvements 31,673      
Total 35,540      
Accumulated Depreciation at December 31, 2021 2,681      
Other | 10 Foster Avenue        
Initial Cost        
Land 244      
Buildings and Improvements 971      
Net Improvements (Retirements) Since Acquisition 110      
Gross Amount Which Carried        
Land 244      
Buildings and Improvements 1,081      
Total 1,325      
Accumulated Depreciation at December 31, 2021 666      
Other | 7 Foster Avenue        
Initial Cost        
Land 231      
Buildings and Improvements 921      
Net Improvements (Retirements) Since Acquisition 31      
Gross Amount Which Carried        
Land 231      
Buildings and Improvements 952      
Total 1,183      
Accumulated Depreciation at December 31, 2021 601      
Other | 2 Foster Avenue        
Initial Cost        
Land 185      
Buildings and Improvements 730      
Net Improvements (Retirements) Since Acquisition 11      
Gross Amount Which Carried        
Land 185      
Buildings and Improvements 741      
Total 926      
Accumulated Depreciation at December 31, 2021 741      
Other | 4 Foster Avenue        
Initial Cost        
Land 183      
Buildings and Improvements 726      
Net Improvements (Retirements) Since Acquisition 6      
Gross Amount Which Carried        
Land 183      
Buildings and Improvements 732      
Total 915      
Accumulated Depreciation at December 31, 2021 732      
Other | 1 Foster Avenue        
Initial Cost        
Land 93      
Buildings and Improvements 364      
Net Improvements (Retirements) Since Acquisition 8      
Gross Amount Which Carried        
Land 93      
Buildings and Improvements 372      
Total 465      
Accumulated Depreciation at December 31, 2021 372      
Other | 5 U.S. Avenue        
Initial Cost        
Land 21      
Buildings and Improvements 81      
Net Improvements (Retirements) Since Acquisition 2      
Gross Amount Which Carried        
Land 21      
Buildings and Improvements 83      
Total 104      
Accumulated Depreciation at December 31, 2021 83      
Other | 5 Foster Avenue        
Initial Cost        
Land 9      
Buildings and Improvements 32      
Net Improvements (Retirements) Since Acquisition 3      
Gross Amount Which Carried        
Land 9      
Buildings and Improvements 35      
Total 44      
Accumulated Depreciation at December 31, 2021 35      
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, 2021 11,036      
Other | Main Street-Piazza        
Initial Cost        
Land 696      
Buildings and Improvements 2,802      
Net Improvements (Retirements) Since Acquisition 3,631      
Gross Amount Which Carried        
Land 704      
Buildings and Improvements 6,425      
Total 7,129      
Accumulated Depreciation at December 31, 2021 4,214      
Other | Main Street-Promenade        
Initial Cost        
Land 532      
Buildings and Improvements 2,052      
Net Improvements (Retirements) Since Acquisition 285      
Gross Amount Which Carried        
Land 532      
Buildings and Improvements 2,337      
Total 2,869      
Accumulated Depreciation at December 31, 2021 1,476      
Other | 920 North King Street        
Initial Cost        
Land 6,141      
Buildings and Improvements 21,140      
Net Improvements (Retirements) Since Acquisition 8,037      
Gross Amount Which Carried        
Land 6,141      
Buildings and Improvements 29,177      
Total 35,318      
Accumulated Depreciation at December 31, 2021 15,938      
Other | 300 Delaware Avenue        
Initial Cost        
Land 6,369      
Buildings and Improvements 13,739      
Net Improvements (Retirements) Since Acquisition 2,468      
Gross Amount Which Carried        
Land 6,369      
Buildings and Improvements 16,207      
Total 22,576      
Accumulated Depreciation at December 31, 2021 $ 9,731