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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Initial Cost        
Land $ 366,673      
Buildings and Improvements 2,494,108      
Net Improvements (Retirements) Since Acquisition 613,328      
Gross Amount Which Carried        
Land 407,514      
Buildings and Improvements 3,066,595      
Total 3,474,109 $ 4,006,459 $ 3,951,719 $ 3,830,824
Accumulated Depreciation at December 31, 2019 896,561 973,318 $ 885,407 $ 913,297
Pennsylvania Suburbs | Six Tower Bridge (181 Washington Street)        
Initial Cost        
Land   6,927    
Buildings and Improvements   14,722    
Net Improvements (Retirements) Since Acquisition   2,166    
Gross Amount Which Carried        
Land   6,237    
Buildings and Improvements   17,578    
Total   23,815    
Accumulated Depreciation at December 31, 2019   4,228    
Pennsylvania Suburbs | 426 West Lancaster Avenue        
Initial Cost        
Land   1,689    
Buildings and Improvements   6,756    
Net Improvements (Retirements) Since Acquisition   8,833    
Gross Amount Which Carried        
Land   1,686    
Buildings and Improvements   15,592    
Total   17,278    
Accumulated Depreciation at December 31, 2019   512    
Pennsylvania Suburbs | 52 Swedesford Square        
Initial Cost        
Land   4,241    
Buildings and Improvements   16,579    
Net Improvements (Retirements) Since Acquisition   (20,820)    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   0    
Total   0    
Accumulated Depreciation at December 31, 2019   0    
Pennsylvania Suburbs | 640 Freedom Business Center        
Initial Cost        
Land   1,015    
Buildings and Improvements   20,098    
Net Improvements (Retirements) Since Acquisition   4,838    
Gross Amount Which Carried        
Land   387    
Buildings and Improvements   25,564    
Total   25,951    
Accumulated Depreciation at December 31, 2019   15,229    
Pennsylvania Suburbs | 620 Freedom Business Center        
Initial Cost        
Land   666    
Buildings and Improvements   13,118    
Net Improvements (Retirements) Since Acquisition   1,888    
Gross Amount Which Carried        
Land   252    
Buildings and Improvements   15,420    
Total   15,672    
Accumulated Depreciation at December 31, 2019   9,416    
Pennsylvania Suburbs | 1000 First Avenue        
Initial Cost        
Land   0    
Buildings and Improvements   13,708    
Net Improvements (Retirements) Since Acquisition   3,235    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   16,943    
Total   16,943    
Accumulated Depreciation at December 31, 2019   11,450    
Pennsylvania Suburbs | 1060 First Avenue        
Initial Cost        
Land   0    
Buildings and Improvements   13,665    
Net Improvements (Retirements) Since Acquisition   4,279    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   17,944    
Total   17,944    
Accumulated Depreciation at December 31, 2019   11,741    
Pennsylvania Suburbs | 630 Freedom Business Center Drive        
Initial Cost        
Land   666    
Buildings and Improvements   13,251    
Net Improvements (Retirements) Since Acquisition   3,497    
Gross Amount Which Carried        
Land   255    
Buildings and Improvements   17,159    
Total   17,414    
Accumulated Depreciation at December 31, 2019   10,139    
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, 2019   9,726    
Pennsylvania Suburbs | 1040 First Avenue        
Initial Cost        
Land   0    
Buildings and Improvements   14,142    
Net Improvements (Retirements) Since Acquisition   5,218    
Gross Amount Which Carried        
Land   0    
Buildings and Improvements   19,360    
Total   19,360    
Accumulated Depreciation at December 31, 2019   12,870    
Pennsylvania Suburbs | 610 Freedom Business Center Drive        
Initial Cost        
Land   485    
Buildings and Improvements   9,602    
Net Improvements (Retirements) Since Acquisition   2,554    
Gross Amount Which Carried        
Land   185    
Buildings and Improvements   12,456    
Total   12,641    
Accumulated Depreciation at December 31, 2019   7,514    
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, 2019   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, 2019   2,768    
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, 2019   3,085    
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, 2019   2,363    
Pennsylvania Suburbs | 401 Plymouth Road        
Initial Cost        
Land   6,199    
Buildings and Improvements   16,131    
Net Improvements (Retirements) Since Acquisition   15,658    
Gross Amount Which Carried        
Land   6,199    
Buildings and Improvements   31,789    
Total   37,988    
Accumulated Depreciation at December 31, 2019   15,816    
Pennsylvania Suburbs | Metroplex (4000 Chemical Road)        
Initial Cost        
Land   4,373    
Buildings and Improvements   24,546    
Net Improvements (Retirements) Since Acquisition   4,627    
Gross Amount Which Carried        
Land   4,373    
Buildings and Improvements   29,173    
Total   33,546    
Accumulated Depreciation at December 31, 2019   8,071    
Pennsylvania Suburbs | 610 West Germantown Pike        
Initial Cost        
Land   3,651    
Buildings and Improvements   14,514    
Net Improvements (Retirements) Since Acquisition   3,578    
Gross Amount Which Carried        
Land   3,651    
Buildings and Improvements   18,092    
Total   21,743    
Accumulated Depreciation at December 31, 2019   8,855    
Pennsylvania Suburbs | 600 West Germantown Pike        
Initial Cost        
Land   3,652    
Buildings and Improvements   15,288    
Net Improvements (Retirements) Since Acquisition   2,463    
Gross Amount Which Carried        
Land   3,652    
Buildings and Improvements   17,751    
Total   21,403    
Accumulated Depreciation at December 31, 2019   8,450    
Pennsylvania Suburbs | 630 West Germantown Pike        
Initial Cost        
Land   3,558    
Buildings and Improvements   14,743    
Net Improvements (Retirements) Since Acquisition   2,189    
Gross Amount Which Carried        
Land   3,558    
Buildings and Improvements   16,932    
Total   20,490    
Accumulated Depreciation at December 31, 2019   8,115    
Pennsylvania Suburbs | 620 West Germantown Pike        
Initial Cost        
Land   3,572    
Buildings and Improvements   14,435    
Net Improvements (Retirements) Since Acquisition   1,866    
Gross Amount Which Carried        
Land   3,572    
Buildings and Improvements   16,301    
Total   19,873    
Accumulated Depreciation at December 31, 2019   7,411    
Pennsylvania Suburbs | 660 West Germantown Pike        
Initial Cost        
Land   3,694    
Buildings and Improvements   5,487    
Net Improvements (Retirements) Since Acquisition   19,682    
Gross Amount Which Carried        
Land   5,405    
Buildings and Improvements   23,458    
Total   28,863    
Accumulated Depreciation at December 31, 2019   6,822    
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, 2019   218    
Pennsylvania Suburbs | 150 Radnor Chester Road        
Initial Cost        
Land   11,925    
Buildings and Improvements   36,986    
Net Improvements (Retirements) Since Acquisition   21,658    
Gross Amount Which Carried        
Land   11,897    
Buildings and Improvements   58,672    
Total   70,569    
Accumulated Depreciation at December 31, 2019   20,187    
Pennsylvania Suburbs | One Radnor Corporate Center        
Initial Cost        
Land   7,323    
Buildings and Improvements   28,613    
Net Improvements (Retirements) Since Acquisition   19,813    
Gross Amount Which Carried        
Land   7,323    
Buildings and Improvements   48,426    
Total   55,749    
Accumulated Depreciation at December 31, 2019   30,728    
Pennsylvania Suburbs | 201 King of Prussia Road        
Initial Cost        
Land   8,956    
Buildings and Improvements   29,811    
Net Improvements (Retirements) Since Acquisition   4,307    
Gross Amount Which Carried        
Land   8,949    
Buildings and Improvements   34,125    
Total   43,074    
Accumulated Depreciation at December 31, 2019   20,508    
Pennsylvania Suburbs | 555 Lancaster Avenue        
Initial Cost        
Land   8,014    
Buildings and Improvements   16,508    
Net Improvements (Retirements) Since Acquisition   19,871    
Gross Amount Which Carried        
Land   8,609    
Buildings and Improvements   35,784    
Total   44,393    
Accumulated Depreciation at December 31, 2019   20,245    
Pennsylvania Suburbs | Four Radnor Corporate Center        
Initial Cost        
Land   5,406    
Buildings and Improvements   21,390    
Net Improvements (Retirements) Since Acquisition   12,633    
Gross Amount Which Carried        
Land   5,705    
Buildings and Improvements   33,724    
Total   39,429    
Accumulated Depreciation at December 31, 2019   17,020    
Pennsylvania Suburbs | Five Radnor Corporate Center        
Initial Cost        
Land   6,506    
Buildings and Improvements   25,525    
Net Improvements (Retirements) Since Acquisition   8,906    
Gross Amount Which Carried        
Land   6,578    
Buildings and Improvements   34,359    
Total   40,937    
Accumulated Depreciation at December 31, 2019   13,689    
Pennsylvania Suburbs | Three Radnor Corporate Center        
Initial Cost        
Land   4,773    
Buildings and Improvements   17,961    
Net Improvements (Retirements) Since Acquisition   2,173    
Gross Amount Which Carried        
Land   4,791    
Buildings and Improvements   20,116    
Total   24,907    
Accumulated Depreciation at December 31, 2019   10,527    
Pennsylvania Suburbs | Two Radnor Corporate Center        
Initial Cost        
Land   3,937    
Buildings and Improvements   15,484    
Net Improvements (Retirements) Since Acquisition   2,879    
Gross Amount Which Carried        
Land   3,942    
Buildings and Improvements   18,358    
Total   22,300    
Accumulated Depreciation at December 31, 2019   10,463    
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, 2019   3,764    
Pennsylvania Suburbs | 170 Radnor Chester Road        
Initial Cost        
Land   2,514    
Buildings and Improvements   8,147    
Net Improvements (Retirements) Since Acquisition   1,728    
Gross Amount Which Carried        
Land   2,509    
Buildings and Improvements   9,880    
Total   12,389    
Accumulated Depreciation at December 31, 2019   4,784    
Pennsylvania Suburbs | 200 N. Radnor Chester Rd.        
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, 2019   857    
Pennsylvania Suburbs | 101 West Elm Street        
Initial Cost        
Land   6,251    
Buildings and Improvements   25,209    
Net Improvements (Retirements) Since Acquisition   2,940    
Gross Amount Which Carried        
Land   6,251    
Buildings and Improvements   28,149    
Total   34,400    
Accumulated Depreciation at December 31, 2019   10,949    
Pennsylvania Suburbs | 1 West Elm Street        
Initial Cost        
Land   3,557    
Buildings and Improvements   14,249    
Net Improvements (Retirements) Since Acquisition   984    
Gross Amount Which Carried        
Land   3,557    
Buildings and Improvements   15,233    
Total   18,790    
Accumulated Depreciation at December 31, 2019   5,955    
Pennsylvania Suburbs | Four Tower Bridge (200 Barr Harbor Drive)        
Initial Cost        
Land   6,000    
Buildings and Improvements   14,734    
Net Improvements (Retirements) Since Acquisition   390    
Gross Amount Which Carried        
Land   6,000    
Buildings and Improvements   15,124    
Total   21,124    
Accumulated Depreciation at December 31, 2019   $ 1,213    
Philadelphia CBD | Cira Centre (2929 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 208,570      
Net Improvements (Retirements) Since Acquisition (16,549)      
Gross Amount Which Carried        
Land 12,586      
Buildings and Improvements 179,435      
Total 192,021      
Accumulated Depreciation at December 31, 2019 68,536      
Philadelphia CBD | Three Logan Square (1717 Arch Street)        
Initial Cost        
Land 0      
Buildings and Improvements 98,188      
Net Improvements (Retirements) Since Acquisition 83,981      
Gross Amount Which Carried        
Land 25,195      
Buildings and Improvements 156,974      
Total 182,169      
Accumulated Depreciation at December 31, 2019 46,611      
Philadelphia CBD | One Logan Square (130 North 18th Street)        
Initial Cost        
Land 14,496      
Buildings and Improvements 107,736      
Net Improvements (Retirements) Since Acquisition 29,992      
Gross Amount Which Carried        
Land 14,473      
Buildings and Improvements 137,751      
Total 152,224      
Accumulated Depreciation at December 31, 2019 67,932      
Philadelphia CBD | Two Logan Square (100 North 18th Street)        
Initial Cost        
Land 16,066      
Buildings and Improvements 100,255      
Net Improvements (Retirements) Since Acquisition 27,936      
Gross Amount Which Carried        
Land 16,066      
Buildings and Improvements 128,191      
Total 144,257      
Accumulated Depreciation at December 31, 2019 53,177      
Philadelphia CBD | Cira Centre South Garage (129 South 30th Street)        
Initial Cost        
Land 0      
Buildings and Improvements 76,008      
Net Improvements (Retirements) Since Acquisition 26,961      
Gross Amount Which Carried        
Land 6,816      
Buildings and Improvements 96,153      
Total 102,969      
Accumulated Depreciation at December 31, 2019 22,377      
Philadelphia CBD | 1900 Market Street        
Initial Cost        
Land 7,768      
Buildings and Improvements 17,263      
Net Improvements (Retirements) Since Acquisition 63,616      
Gross Amount Which Carried        
Land 7,768      
Buildings and Improvements 80,879      
Total 88,647      
Accumulated Depreciation at December 31, 2019 20,545      
Philadelphia CBD | 3020 Market Street        
Initial Cost        
Land 0      
Buildings and Improvements 21,417      
Net Improvements (Retirements) Since Acquisition 7,827      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 29,244      
Total 29,244      
Accumulated Depreciation at December 31, 2019 11,501      
Philadelphia CBD | 618-634 Market Street        
Initial Cost        
Land 13,365      
Buildings and Improvements 5,791      
Net Improvements (Retirements) Since Acquisition 2,810      
Gross Amount Which Carried        
Land 13,365      
Buildings and Improvements 8,601      
Total 21,966      
Accumulated Depreciation at December 31, 2019 6,522      
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 18,005      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 418,299      
Total 418,299      
Accumulated Depreciation at December 31, 2019 63,196      
Philadelphia CBD | 2100 Market Street        
Initial Cost        
Land 18,827      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 6,433      
Gross Amount Which Carried        
Land 18,854      
Buildings and Improvements 6,406      
Total 25,260      
Accumulated Depreciation at December 31, 2019 1,517      
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, 2019 25      
Philadelphia CBD | The Bulletin Building (3025 Market Street)        
Initial Cost        
Land 0      
Buildings and Improvements 24,377      
Net Improvements (Retirements) Since Acquisition 42,669      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 67,046      
Total 67,046      
Accumulated Depreciation at December 31, 2019 4,405      
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, 2019 17      
Philadelphia CBD | 3025 JFK Boulevard        
Initial Cost        
Land 0      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 0      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 0      
Total 0      
Accumulated Depreciation at December 31, 2019 0      
Metropolitan DC | 6600 Rockledge Drive        
Initial Cost        
Land 0      
Buildings and Improvements 37,421      
Net Improvements (Retirements) Since Acquisition 10,036      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 47,457      
Total 47,457      
Accumulated Depreciation at December 31, 2019 16,270      
Metropolitan DC | 2340 Dulles Corner Boulevard        
Initial Cost        
Land 16,345      
Buildings and Improvements 65,379      
Net Improvements (Retirements) Since Acquisition 524      
Gross Amount Which Carried        
Land 16,129      
Buildings and Improvements 66,119      
Total 82,248      
Accumulated Depreciation at December 31, 2019 23,858      
Metropolitan DC | 1676 International Drive        
Initial Cost        
Land 18,437      
Buildings and Improvements 97,538      
Net Improvements (Retirements) Since Acquisition 17,656      
Gross Amount Which Carried        
Land 18,785      
Buildings and Improvements 114,846      
Total 133,631      
Accumulated Depreciation at December 31, 2019 27,969      
Metropolitan DC | 8260 Greensboro Drive        
Initial Cost        
Land 7,952      
Buildings and Improvements 33,964      
Net Improvements (Retirements) Since Acquisition 5,313      
Gross Amount Which Carried        
Land 8,102      
Buildings and Improvements 39,127      
Total 47,229      
Accumulated Depreciation at December 31, 2019 12,664      
Metropolitan DC | 8521 Leesburg Pike        
Initial Cost        
Land 4,316      
Buildings and Improvements 30,885      
Net Improvements (Retirements) Since Acquisition 7,007      
Gross Amount Which Carried        
Land 4,397      
Buildings and Improvements 37,811      
Total 42,208      
Accumulated Depreciation at December 31, 2019 12,898      
Austin, Texas | 11501 Burnet Road - Building 1        
Initial Cost        
Land 3,755      
Buildings and Improvements 22,702      
Net Improvements (Retirements) Since Acquisition 12      
Gross Amount Which Carried        
Land 3,755      
Buildings and Improvements 22,714      
Total 26,469      
Accumulated Depreciation at December 31, 2019 3,788      
Austin, Texas | 11501 Burnet Road - Building 2        
Initial Cost        
Land 2,732      
Buildings and Improvements 16,305      
Net Improvements (Retirements) Since Acquisition 1,479      
Gross Amount Which Carried        
Land 2,732      
Buildings and Improvements 17,784      
Total 20,516      
Accumulated Depreciation at December 31, 2019 3,471      
Austin, Texas | 11501 Burnet Road - Building 3        
Initial Cost        
Land 3,688      
Buildings and Improvements 22,348      
Net Improvements (Retirements) Since Acquisition 10      
Gross Amount Which Carried        
Land 3,688      
Buildings and Improvements 22,358      
Total 26,046      
Accumulated Depreciation at December 31, 2019 3,729      
Austin, Texas | 11501 Burnet Road - Building 4        
Initial Cost        
Land 2,614      
Buildings and Improvements 15,740      
Net Improvements (Retirements) Since Acquisition 8      
Gross Amount Which Carried        
Land 2,614      
Buildings and Improvements 15,748      
Total 18,362      
Accumulated Depreciation at December 31, 2019 2,628      
Austin, Texas | 11501 Burnet Road - Building 5        
Initial Cost        
Land 3,689      
Buildings and Improvements 22,354      
Net Improvements (Retirements) Since Acquisition 13      
Gross Amount Which Carried        
Land 3,689      
Buildings and Improvements 22,367      
Total 26,056      
Accumulated Depreciation at December 31, 2019 3,733      
Austin, Texas | 11501 Burnet Road - Building 6        
Initial Cost        
Land 2,676      
Buildings and Improvements 15,972      
Net Improvements (Retirements) Since Acquisition 14,133      
Gross Amount Which Carried        
Land 2,676      
Buildings and Improvements 30,105      
Total 32,781      
Accumulated Depreciation at December 31, 2019 5,446      
Austin, Texas | 11501 Burnet Road - Building 8        
Initial Cost        
Land 1,400      
Buildings and Improvements 7,422      
Net Improvements (Retirements) Since Acquisition 1,523      
Gross Amount Which Carried        
Land 1,400      
Buildings and Improvements 8,945      
Total 10,345      
Accumulated Depreciation at December 31, 2019 1,536      
Austin, Texas | 11501 Burnet Road - Parking Garage        
Initial Cost        
Land 0      
Buildings and Improvements 19,826      
Net Improvements (Retirements) Since Acquisition 6      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 19,832      
Total 19,832      
Accumulated Depreciation at December 31, 2019 4,378      
Austin, Texas | Four Points Centre 3, 11120 Four Points Drive        
Initial Cost        
Land 1,140      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 40,330      
Gross Amount Which Carried        
Land 1,141      
Buildings and Improvements 40,329      
Total 41,470      
Accumulated Depreciation at December 31, 2019 3,279      
Austin, Texas | One Barton Skyway (1501 South MoPac Expressway)        
Initial Cost        
Land 10,496      
Buildings and Improvements 47,670      
Net Improvements (Retirements) Since Acquisition 3,448      
Gross Amount Which Carried        
Land 10,495      
Buildings and Improvements 51,119      
Total 61,614      
Accumulated Depreciation at December 31, 2019 2,826      
Austin, Texas | Two Barton Skyway (1601 South MoPac Expressway)        
Initial Cost        
Land 10,849      
Buildings and Improvements 53,868      
Net Improvements (Retirements) Since Acquisition 2,820      
Gross Amount Which Carried        
Land 10,848      
Buildings and Improvements 56,689      
Total 67,537      
Accumulated Depreciation at December 31, 2019 3,532      
Austin, Texas | Three Barton Skyway (1221 South MoPac Expressway)        
Initial Cost        
Land 10,374      
Buildings and Improvements 47,624      
Net Improvements (Retirements) Since Acquisition 304      
Gross Amount Which Carried        
Land 10,373      
Buildings and Improvements 47,929      
Total 58,302      
Accumulated Depreciation at December 31, 2019 2,603      
Austin, Texas | Four Barton Skyway (1301 South MoPac Expressway)        
Initial Cost        
Land 13,301      
Buildings and Improvements 57,041      
Net Improvements (Retirements) Since Acquisition 2,904      
Gross Amount Which Carried        
Land 13,300      
Buildings and Improvements 59,946      
Total 73,246      
Accumulated Depreciation at December 31, 2019 3,162      
Austin, Texas | Four Points Centre (11305 Four Points Drive)        
Initial Cost        
Land 7,800      
Buildings and Improvements 43,581      
Net Improvements (Retirements) Since Acquisition 3,923      
Gross Amount Which Carried        
Land 7,800      
Buildings and Improvements 47,504      
Total 55,304      
Accumulated Depreciation at December 31, 2019 3,024      
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 537      
Gross Amount Which Carried        
Land 2,004      
Buildings and Improvements 18,217      
Total 20,221      
Accumulated Depreciation at December 31, 2019 1,072      
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 618      
Gross Amount Which Carried        
Land 3,137      
Buildings and Improvements 29,872      
Total 33,009      
Accumulated Depreciation at December 31, 2019 1,634      
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 279      
Gross Amount Which Carried        
Land 3,064      
Buildings and Improvements 26,984      
Total 30,048      
Accumulated Depreciation at December 31, 2019 1,429      
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 1,047      
Gross Amount Which Carried        
Land 2,273      
Buildings and Improvements 19,664      
Total 21,937      
Accumulated Depreciation at December 31, 2019 1,345      
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 97      
Gross Amount Which Carried        
Land 1,752      
Buildings and Improvements 14,412      
Total 16,164      
Accumulated Depreciation at December 31, 2019 768      
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 22      
Gross Amount Which Carried        
Land 1,598      
Buildings and Improvements 12,967      
Total 14,565      
Accumulated Depreciation at December 31, 2019 690      
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 1,094      
Gross Amount Which Carried        
Land 1,801      
Buildings and Improvements 17,580      
Total 19,381      
Accumulated Depreciation at December 31, 2019 1,210      
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, 2019 1,772      
Other | 10 Foster Avenue        
Initial Cost        
Land 244      
Buildings and Improvements 971      
Net Improvements (Retirements) Since Acquisition 164      
Gross Amount Which Carried        
Land 244      
Buildings and Improvements 1,135      
Total 1,379      
Accumulated Depreciation at December 31, 2019 659      
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, 2019 575      
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, 2019 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, 2019 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, 2019 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, 2019 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, 2019 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, 2019 11,017      
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, 2019 3,837      
Other | Main Street-Promenade        
Initial Cost        
Land 532      
Buildings and Improvements 2,052      
Net Improvements (Retirements) Since Acquisition 326      
Gross Amount Which Carried        
Land 532      
Buildings and Improvements 2,378      
Total 2,910      
Accumulated Depreciation at December 31, 2019 1,432      
Other | 920 North King Street        
Initial Cost        
Land 6,141      
Buildings and Improvements 21,140      
Net Improvements (Retirements) Since Acquisition 8,059      
Gross Amount Which Carried        
Land 6,141      
Buildings and Improvements 29,199      
Total 35,340      
Accumulated Depreciation at December 31, 2019 14,492      
Other | 300 Delaware Avenue        
Initial Cost        
Land 6,369      
Buildings and Improvements 13,739      
Net Improvements (Retirements) Since Acquisition 2,657      
Gross Amount Which Carried        
Land 6,369      
Buildings and Improvements 16,396      
Total 22,765      
Accumulated Depreciation at December 31, 2019 $ 9,823