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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Initial Cost        
Encumbrances $ 245,000      
Land 358,066      
Buildings and Improvements 2,520,935      
Net Improvements (Retirements) Since Acquisition 663,128      
Gross Amount Which Carried        
Land 394,669      
Buildings and Improvements 3,147,563      
Total 3,542,232 $ 3,617,240 $ 3,472,602 $ 3,474,109
Accumulated Depreciation at December 31, 2023 1,131,792 $ 1,063,060 $ 957,450 $ 896,561
PENNSYLVANIA SUBURBS | Six Tower Bridge (181 Washington Street)        
Initial Cost        
Encumbrances 0      
Land 6,927      
Buildings and Improvements 14,722      
Net Improvements (Retirements) Since Acquisition 1,330      
Gross Amount Which Carried        
Land 6,237      
Buildings and Improvements 16,742      
Total 22,979      
Accumulated Depreciation at December 31, 2023 5,108      
PENNSYLVANIA SUBURBS | 426 Lancaster Avenue        
Initial Cost        
Encumbrances 0      
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, 2023 3,841      
PENNSYLVANIA SUBURBS | 640 Freedom Business Center        
Initial Cost        
Encumbrances 0      
Land 1,015      
Buildings and Improvements 20,098      
Net Improvements (Retirements) Since Acquisition 4,762      
Gross Amount Which Carried        
Land 305      
Buildings and Improvements 25,570      
Total 25,875      
Accumulated Depreciation at December 31, 2023 17,737      
PENNSYLVANIA SUBURBS | 620 Freedom Business Center        
Initial Cost        
Encumbrances 0      
Land 666      
Buildings and Improvements 13,118      
Net Improvements (Retirements) Since Acquisition 3,160      
Gross Amount Which Carried        
Land 199      
Buildings and Improvements 16,745      
Total 16,944      
Accumulated Depreciation at December 31, 2023 10,756      
PENNSYLVANIA SUBURBS | 1000 First Avenue        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 13,708      
Net Improvements (Retirements) Since Acquisition 3,345      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 17,053      
Total 17,053      
Accumulated Depreciation at December 31, 2023 13,278      
PENNSYLVANIA SUBURBS | 1060 First Avenue        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 13,665      
Net Improvements (Retirements) Since Acquisition 4,134      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 17,799      
Total 17,799      
Accumulated Depreciation at December 31, 2023 13,769      
PENNSYLVANIA SUBURBS | 630 Freedom Business Center Drive        
Initial Cost        
Encumbrances 0      
Land 666      
Buildings and Improvements 13,251      
Net Improvements (Retirements) Since Acquisition 3,182      
Gross Amount Which Carried        
Land 201      
Buildings and Improvements 16,898      
Total 17,099      
Accumulated Depreciation at December 31, 2023 11,422      
PENNSYLVANIA SUBURBS | 1020 First Avenue        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 10,744      
Net Improvements (Retirements) Since Acquisition 4,544      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 15,288      
Total 15,288      
Accumulated Depreciation at December 31, 2023 11,736      
PENNSYLVANIA SUBURBS | 1040 First Avenue        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 14,142      
Net Improvements (Retirements) Since Acquisition 5,065      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 19,207      
Total 19,207      
Accumulated Depreciation at December 31, 2023 14,973      
PENNSYLVANIA SUBURBS | 610 Freedom Business Center Drive        
Initial Cost        
Encumbrances 0      
Land 485      
Buildings and Improvements 9,602      
Net Improvements (Retirements) Since Acquisition 1,615      
Gross Amount Which Carried        
Land 146      
Buildings and Improvements 11,556      
Total 11,702      
Accumulated Depreciation at December 31, 2023 8,089      
PENNSYLVANIA SUBURBS | 650 Park Avenue        
Initial Cost        
Encumbrances 0      
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, 2023 0      
PENNSYLVANIA SUBURBS | 600 Park Avenue        
Initial Cost        
Encumbrances 0      
Land 1,012      
Buildings and Improvements 4,048      
Net Improvements (Retirements) Since Acquisition 0      
Gross Amount Which Carried        
Land 1,012      
Buildings and Improvements 4,048      
Total 5,060      
Accumulated Depreciation at December 31, 2023 2,706      
PENNSYLVANIA SUBURBS | 933 First Avenue        
Initial Cost        
Encumbrances 15,960      
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, 2023 5,692      
PENNSYLVANIA SUBURBS | 500 North Gulph Road        
Initial Cost        
Encumbrances 16,121      
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, 2023 5,854      
PENNSYLVANIA SUBURBS | 401 Plymouth Road        
Initial Cost        
Encumbrances 0      
Land 6,199      
Buildings and Improvements 16,131      
Net Improvements (Retirements) Since Acquisition 15,706      
Gross Amount Which Carried        
Land 6,199      
Buildings and Improvements 31,837      
Total 38,036      
Accumulated Depreciation at December 31, 2023 16,202      
PENNSYLVANIA SUBURBS | Metroplex (4000 Chemical Road)        
Initial Cost        
Encumbrances 16,055      
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, 2023 11,076      
PENNSYLVANIA SUBURBS | Metroplex II        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 569      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 569      
Total 569      
Accumulated Depreciation at December 31, 2023 6      
PENNSYLVANIA SUBURBS | Metroplex III        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 317      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 317      
Total 317      
Accumulated Depreciation at December 31, 2023 4      
PENNSYLVANIA SUBURBS | 610 West Germantown Pike        
Initial Cost        
Encumbrances 0      
Land 3,651      
Buildings and Improvements 14,514      
Net Improvements (Retirements) Since Acquisition 254      
Gross Amount Which Carried        
Land 3,051      
Buildings and Improvements 15,368      
Total 18,419      
Accumulated Depreciation at December 31, 2023 7,768      
PENNSYLVANIA SUBURBS | 600 West Germantown Pike        
Initial Cost        
Encumbrances 0      
Land 3,652      
Buildings and Improvements 15,288      
Net Improvements (Retirements) Since Acquisition (415)      
Gross Amount Which Carried        
Land 3,052      
Buildings and Improvements 15,473      
Total 18,525      
Accumulated Depreciation at December 31, 2023 7,992      
PENNSYLVANIA SUBURBS | 630 West Germantown Pike        
Initial Cost        
Encumbrances 0      
Land 3,558      
Buildings and Improvements 14,743      
Net Improvements (Retirements) Since Acquisition (673)      
Gross Amount Which Carried        
Land 2,973      
Buildings and Improvements 14,655      
Total 17,628      
Accumulated Depreciation at December 31, 2023 7,757      
PENNSYLVANIA SUBURBS | 620 West Germantown Pike        
Initial Cost        
Encumbrances 0      
Land 3,572      
Buildings and Improvements 14,435      
Net Improvements (Retirements) Since Acquisition 1,156      
Gross Amount Which Carried        
Land 2,985      
Buildings and Improvements 16,178      
Total 19,163      
Accumulated Depreciation at December 31, 2023 7,802      
PENNSYLVANIA SUBURBS | 660 West Germantown Pike        
Initial Cost        
Encumbrances 0      
Land 3,694      
Buildings and Improvements 5,487      
Net Improvements (Retirements) Since Acquisition 14,871      
Gross Amount Which Carried        
Land 4,517      
Buildings and Improvements 19,535      
Total 24,052      
Accumulated Depreciation at December 31, 2023 7,784      
PENNSYLVANIA SUBURBS | 351 Plymouth Road        
Initial Cost        
Encumbrances 0      
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, 2023 260      
PENNSYLVANIA SUBURBS | 150 Radnor Chester Road        
Initial Cost        
Encumbrances 0      
Land 11,925      
Buildings and Improvements 36,986      
Net Improvements (Retirements) Since Acquisition 22,327      
Gross Amount Which Carried        
Land 11,897      
Buildings and Improvements 59,341      
Total 71,238      
Accumulated Depreciation at December 31, 2023 30,253      
PENNSYLVANIA SUBURBS | One Radnor Corporate Center        
Initial Cost        
Encumbrances 0      
Land 7,323      
Buildings and Improvements 28,613      
Net Improvements (Retirements) Since Acquisition 4,133      
Gross Amount Which Carried        
Land 7,323      
Buildings and Improvements 32,746      
Total 40,069      
Accumulated Depreciation at December 31, 2023 19,410      
PENNSYLVANIA SUBURBS | 201 King of Prussia Road        
Initial Cost        
Encumbrances 0      
Land 8,956      
Buildings and Improvements 29,811      
Net Improvements (Retirements) Since Acquisition 4,939      
Gross Amount Which Carried        
Land 8,949      
Buildings and Improvements 34,757      
Total 43,706      
Accumulated Depreciation at December 31, 2023 24,432      
PENNSYLVANIA SUBURBS | 555 Lancaster Avenue        
Initial Cost        
Encumbrances 0      
Land 8,014      
Buildings and Improvements 16,508      
Net Improvements (Retirements) Since Acquisition 12,652      
Gross Amount Which Carried        
Land 8,609      
Buildings and Improvements 28,565      
Total 37,174      
Accumulated Depreciation at December 31, 2023 10,733      
PENNSYLVANIA SUBURBS | Four Radnor Corporate Center        
Initial Cost        
Encumbrances 0      
Land 5,406      
Buildings and Improvements 21,390      
Net Improvements (Retirements) Since Acquisition 6,719      
Gross Amount Which Carried        
Land 5,705      
Buildings and Improvements 27,810      
Total 33,515      
Accumulated Depreciation at December 31, 2023 16,857      
PENNSYLVANIA SUBURBS | Five Radnor Corporate Center        
Initial Cost        
Encumbrances 0      
Land 6,506      
Buildings and Improvements 25,525      
Net Improvements (Retirements) Since Acquisition 9,676      
Gross Amount Which Carried        
Land 6,578      
Buildings and Improvements 35,129      
Total 41,707      
Accumulated Depreciation at December 31, 2023 17,511      
PENNSYLVANIA SUBURBS | Three Radnor Corporate Center        
Initial Cost        
Encumbrances 0      
Land 4,773      
Buildings and Improvements 17,961      
Net Improvements (Retirements) Since Acquisition 2,740      
Gross Amount Which Carried        
Land 4,791      
Buildings and Improvements 20,683      
Total 25,474      
Accumulated Depreciation at December 31, 2023 12,840      
PENNSYLVANIA SUBURBS | Two Radnor Corporate Center        
Initial Cost        
Encumbrances 0      
Land 3,937      
Buildings and Improvements 15,484      
Net Improvements (Retirements) Since Acquisition 5,195      
Gross Amount Which Carried        
Land 3,942      
Buildings and Improvements 20,674      
Total 24,616      
Accumulated Depreciation at December 31, 2023 11,281      
PENNSYLVANIA SUBURBS | 130 Radnor Chester Road        
Initial Cost        
Encumbrances 0      
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, 2023 4,324      
PENNSYLVANIA SUBURBS | 170 Radnor Chester Road        
Initial Cost        
Encumbrances 0      
Land 2,514      
Buildings and Improvements 8,147      
Net Improvements (Retirements) Since Acquisition 2,344      
Gross Amount Which Carried        
Land 2,509      
Buildings and Improvements 10,496      
Total 13,005      
Accumulated Depreciation at December 31, 2023 5,860      
PENNSYLVANIA SUBURBS | 101 West Elm Street        
Initial Cost        
Encumbrances 0      
Land 6,251      
Buildings and Improvements 25,209      
Net Improvements (Retirements) Since Acquisition 2,600      
Gross Amount Which Carried        
Land 6,251      
Buildings and Improvements 27,809      
Total 34,060      
Accumulated Depreciation at December 31, 2023 13,040      
PENNSYLVANIA SUBURBS | 1 West Elm Street        
Initial Cost        
Encumbrances 0      
Land 3,557      
Buildings and Improvements 14,249      
Net Improvements (Retirements) Since Acquisition 9,139      
Gross Amount Which Carried        
Land 3,557      
Buildings and Improvements 23,388      
Total 26,945      
Accumulated Depreciation at December 31, 2023 8,417      
PENNSYLVANIA SUBURBS | 250 King of Prussia Road        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 20,566      
Net Improvements (Retirements) Since Acquisition 65,182      
Gross Amount Which Carried        
Land 11,200      
Buildings and Improvements 74,548      
Total 85,748      
Accumulated Depreciation at December 31, 2023 4,666      
PHILADELPHIA CBD | 3001-3003 JFK Boulevard        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 85      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 85      
Total 85      
Accumulated Depreciation at December 31, 2023 38      
PHILADELPHIA CBD | Cira Centre (2929 Arch Street)        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 208,570      
Net Improvements (Retirements) Since Acquisition 38,189      
Gross Amount Which Carried        
Land 12,586      
Buildings and Improvements 234,173      
Total 246,759      
Accumulated Depreciation at December 31, 2023 82,593      
PHILADELPHIA CBD | Three Logan Square (1717 Arch Street)        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 98,188      
Net Improvements (Retirements) Since Acquisition 87,145      
Gross Amount Which Carried        
Land 25,195      
Buildings and Improvements 160,138      
Total 185,333      
Accumulated Depreciation at December 31, 2023 68,452      
PHILADELPHIA CBD | One Logan Square (130 North 18th Street)        
Initial Cost        
Encumbrances 0      
Land 14,496      
Buildings and Improvements 107,736      
Net Improvements (Retirements) Since Acquisition 23,882      
Gross Amount Which Carried        
Land 14,473      
Buildings and Improvements 131,641      
Total 146,114      
Accumulated Depreciation at December 31, 2023 75,119      
PHILADELPHIA CBD | Two Logan Square (100 North 18th Street)        
Initial Cost        
Encumbrances 0      
Land 16,066      
Buildings and Improvements 100,255      
Net Improvements (Retirements) Since Acquisition 34,756      
Gross Amount Which Carried        
Land 16,066      
Buildings and Improvements 135,011      
Total 151,077      
Accumulated Depreciation at December 31, 2023 67,090      
PHILADELPHIA CBD | Cira Centre South Garage (129 South 30th Street)        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 76,008      
Net Improvements (Retirements) Since Acquisition 26,881      
Gross Amount Which Carried        
Land 6,549      
Buildings and Improvements 96,340      
Total 102,889      
Accumulated Depreciation at December 31, 2023 30,503      
PHILADELPHIA CBD | 1900 Market Street        
Initial Cost        
Encumbrances 61,703      
Land 7,768      
Buildings and Improvements 17,263      
Net Improvements (Retirements) Since Acquisition 61,721      
Gross Amount Which Carried        
Land 7,768      
Buildings and Improvements 78,984      
Total 86,752      
Accumulated Depreciation at December 31, 2023 35,534      
PHILADELPHIA CBD | 3020 Market Street        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 21,417      
Net Improvements (Retirements) Since Acquisition 6,005      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 27,422      
Total 27,422      
Accumulated Depreciation at December 31, 2023 13,339      
PHILADELPHIA CBD | 618-634 Market Street        
Initial Cost        
Encumbrances 0      
Land 13,365      
Buildings and Improvements 5,791      
Net Improvements (Retirements) Since Acquisition 5,161      
Gross Amount Which Carried        
Land 13,365      
Buildings and Improvements 10,952      
Total 24,317      
Accumulated Depreciation at December 31, 2023 7,610      
PHILADELPHIA CBD | FMC Tower at Cira Centre South (2929 Walnut Street)        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 400,294      
Net Improvements (Retirements) Since Acquisition 10,819      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 411,113      
Total 411,113      
Accumulated Depreciation at December 31, 2023 100,935      
PHILADELPHIA CBD | 2100 Market Street        
Initial Cost        
Encumbrances 0      
Land 18,827      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 6,318      
Gross Amount Which Carried        
Land 18,854      
Buildings and Improvements 6,291      
Total 25,145      
Accumulated Depreciation at December 31, 2023 2,715      
PHILADELPHIA CBD | 1505-11 Race Street        
Initial Cost        
Encumbrances 0      
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, 2023 480      
PHILADELPHIA CBD | 3000 Market Street        
Initial Cost        
Encumbrances 0      
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, 2023 4,739      
PHILADELPHIA CBD | The Bulletin Building (3025 Market Street)        
Initial Cost        
Encumbrances 49,429      
Land 0      
Buildings and Improvements 24,377      
Net Improvements (Retirements) Since Acquisition 44,435      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 68,812      
Total 68,812      
Accumulated Depreciation at December 31, 2023 15,078      
AUSTIN, TX | 401-405 Colorado Street        
Initial Cost        
Encumbrances 62,688      
Land 0      
Buildings and Improvements 106,828      
Net Improvements (Retirements) Since Acquisition 564      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 107,392      
Total 107,392      
Accumulated Depreciation at December 31, 2023 5,958      
AUSTIN, TX | 11501 Burnet Road - Building 1        
Initial Cost        
Encumbrances 0      
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, 2023 11,689      
AUSTIN, TX | 11501 Burnet Road - Building 2        
Initial Cost        
Encumbrances 0      
Land 2,732      
Buildings and Improvements 16,305      
Net Improvements (Retirements) Since Acquisition 733      
Gross Amount Which Carried        
Land 2,732      
Buildings and Improvements 17,038      
Total 19,770      
Accumulated Depreciation at December 31, 2023 8,991      
AUSTIN, TX | 11501 Burnet Road - Building 3        
Initial Cost        
Encumbrances 0      
Land 3,688      
Buildings and Improvements 22,348      
Net Improvements (Retirements) Since Acquisition 7,118      
Gross Amount Which Carried        
Land 3,688      
Buildings and Improvements 29,466      
Total 33,154      
Accumulated Depreciation at December 31, 2023 13,671      
AUSTIN, TX | 11501 Burnet Road - Building 4        
Initial Cost        
Encumbrances 0      
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, 2023 8,105      
AUSTIN, TX | 11501 Burnet Road - Building 5        
Initial Cost        
Encumbrances 0      
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, 2023 11,511      
AUSTIN, TX | 11501 Burnet Road - Building 6        
Initial Cost        
Encumbrances 0      
Land 2,676      
Buildings and Improvements 15,972      
Net Improvements (Retirements) Since Acquisition 14,114      
Gross Amount Which Carried        
Land 2,676      
Buildings and Improvements 30,086      
Total 32,762      
Accumulated Depreciation at December 31, 2023 16,346      
AUSTIN, TX | 11501 Burnet Road - Building 8        
Initial Cost        
Encumbrances 0      
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, 2023 4,742      
AUSTIN, TX | 11501 Burnet Road - Parking Garage        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 19,826      
Net Improvements (Retirements) Since Acquisition 1,588      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 21,414      
Total 21,414      
Accumulated Depreciation at December 31, 2023 11,364      
AUSTIN, TX | Four Points Centre 3, 11120 Four Points Drive        
Initial Cost        
Encumbrances 23,044      
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, 2023 8,637      
AUSTIN, TX | One Barton Skyway (1501 South MoPac Expressway)        
Initial Cost        
Encumbrances 0      
Land 10,496      
Buildings and Improvements 47,670      
Net Improvements (Retirements) Since Acquisition 8,189      
Gross Amount Which Carried        
Land 10,495      
Buildings and Improvements 55,860      
Total 66,355      
Accumulated Depreciation at December 31, 2023 8,647      
AUSTIN, TX | Two Barton Skyway (1601 South MoPac Expressway)        
Initial Cost        
Encumbrances 0      
Land 10,849      
Buildings and Improvements 53,868      
Net Improvements (Retirements) Since Acquisition 3,784      
Gross Amount Which Carried        
Land 10,848      
Buildings and Improvements 57,653      
Total 68,501      
Accumulated Depreciation at December 31, 2023 9,099      
AUSTIN, TX | Four Barton Skyway (1301 South MoPac Expressway)        
Initial Cost        
Encumbrances 0      
Land 13,301      
Buildings and Improvements 57,041      
Net Improvements (Retirements) Since Acquisition 7,895      
Gross Amount Which Carried        
Land 13,300      
Buildings and Improvements 64,937      
Total 78,237      
Accumulated Depreciation at December 31, 2023 9,367      
AUSTIN, TX | Four Points Centre (11305 Four Points Drive)        
Initial Cost        
Encumbrances 0      
Land 7,800      
Buildings and Improvements 43,581      
Net Improvements (Retirements) Since Acquisition 4,622      
Gross Amount Which Carried        
Land 7,800      
Buildings and Improvements 48,203      
Total 56,003      
Accumulated Depreciation at December 31, 2023 7,977      
AUSTIN, TX | River Place - Building 1 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
Land 2,004      
Buildings and Improvements 17,680      
Net Improvements (Retirements) Since Acquisition 990      
Gross Amount Which Carried        
Land 2,004      
Buildings and Improvements 18,670      
Total 20,674      
Accumulated Depreciation at December 31, 2023 2,822      
AUSTIN, TX | River Place - Building 2 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
Land 3,137      
Buildings and Improvements 29,254      
Net Improvements (Retirements) Since Acquisition 1,508      
Gross Amount Which Carried        
Land 3,137      
Buildings and Improvements 30,762      
Total 33,899      
Accumulated Depreciation at December 31, 2023 4,338      
AUSTIN, TX | River Place - Building 3 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
Land 3,064      
Buildings and Improvements 26,705      
Net Improvements (Retirements) Since Acquisition 1,195      
Gross Amount Which Carried        
Land 3,064      
Buildings and Improvements 27,900      
Total 30,964      
Accumulated Depreciation at December 31, 2023 3,753      
AUSTIN, TX | River Place - Building 4 (6500 River Place Boulevard        
Initial Cost        
Encumbrances 0      
Land 2,273      
Buildings and Improvements 18,617      
Net Improvements (Retirements) Since Acquisition 1,140      
Gross Amount Which Carried        
Land 2,273      
Buildings and Improvements 19,757      
Total 22,030      
Accumulated Depreciation at December 31, 2023 2,684      
AUSTIN, TX | River Place - Building 5 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
Land 1,752      
Buildings and Improvements 14,315      
Net Improvements (Retirements) Since Acquisition 736      
Gross Amount Which Carried        
Land 1,752      
Buildings and Improvements 15,051      
Total 16,803      
Accumulated Depreciation at December 31, 2023 2,218      
AUSTIN, TX | River Place - Building 6 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
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, 2023 2,044      
AUSTIN, TX | River Place - Building 7 (6500 River Place Boulevard)        
Initial Cost        
Encumbrances 0      
Land 1,801      
Buildings and Improvements 16,486      
Net Improvements (Retirements) Since Acquisition 1,374      
Gross Amount Which Carried        
Land 1,801      
Buildings and Improvements 17,860      
Total 19,661      
Accumulated Depreciation at December 31, 2023 3,146      
AUSTIN, TX | Quarry Lake II (4516 Seton Center Parkway)        
Initial Cost        
Encumbrances 0      
Land 3,970      
Buildings and Improvements 30,546      
Net Improvements (Retirements) Since Acquisition 1,678      
Gross Amount Which Carried        
Land 3,867      
Buildings and Improvements 32,327      
Total 36,194      
Accumulated Depreciation at December 31, 2023 4,541      
Other | 6600 Rockledge Drive        
Initial Cost        
Encumbrances 0      
Land 0      
Buildings and Improvements 37,421      
Net Improvements (Retirements) Since Acquisition (14,597)      
Gross Amount Which Carried        
Land 0      
Buildings and Improvements 22,824      
Total 22,824      
Accumulated Depreciation at December 31, 2023 9,299      
Other | 1676 International Drive        
Initial Cost        
Encumbrances 0      
Land 18,437      
Buildings and Improvements 97,538      
Net Improvements (Retirements) Since Acquisition (30,581)      
Gross Amount Which Carried        
Land 10,239      
Buildings and Improvements 75,155      
Total 85,394      
Accumulated Depreciation at December 31, 2023 22,630      
Other | 8260 Greensboro Drive        
Initial Cost        
Encumbrances 0      
Land 7,952      
Buildings and Improvements 33,964      
Net Improvements (Retirements) Since Acquisition 10,969      
Gross Amount Which Carried        
Land 8,102      
Buildings and Improvements 44,783      
Total 52,885      
Accumulated Depreciation at December 31, 2023 15,881      
Other | 2340 Dulles Corner Boulevard        
Initial Cost        
Encumbrances 0      
Land 16,345      
Buildings and Improvements 65,379      
Net Improvements (Retirements) Since Acquisition (23,353)      
Gross Amount Which Carried        
Land 9,747      
Buildings and Improvements 48,624      
Total 58,371      
Accumulated Depreciation at December 31, 2023 1,192      
Other | Dabney Land Westwood        
Initial Cost        
Encumbrances 0      
Land 1,732      
Buildings and Improvements 0      
Net Improvements (Retirements) Since Acquisition 3,690      
Gross Amount Which Carried        
Land 819      
Buildings and Improvements 4,706      
Total 5,525      
Accumulated Depreciation at December 31, 2023 493      
Other | Main Street-Plaza 1000        
Initial Cost        
Encumbrances 0      
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, 2023 11,073      
Other | Main Street-Piazza        
Initial Cost        
Encumbrances 0      
Land 696      
Buildings and Improvements 2,802      
Net Improvements (Retirements) Since Acquisition 2,762      
Gross Amount Which Carried        
Land 704      
Buildings and Improvements 5,556      
Total 6,260      
Accumulated Depreciation at December 31, 2023 4,042      
Other | Main Street-Promenade        
Initial Cost        
Encumbrances 0      
Land 532      
Buildings and Improvements 2,052      
Net Improvements (Retirements) Since Acquisition 265      
Gross Amount Which Carried        
Land 532      
Buildings and Improvements 2,317      
Total 2,849      
Accumulated Depreciation at December 31, 2023 1,599      
Other | 920 North King Street        
Initial Cost        
Encumbrances 0      
Land 6,141      
Buildings and Improvements 21,140      
Net Improvements (Retirements) Since Acquisition 7,272      
Gross Amount Which Carried        
Land 6,141      
Buildings and Improvements 28,412      
Total 34,553      
Accumulated Depreciation at December 31, 2023 17,591      
Other | 300 Delaware Avenue        
Initial Cost        
Encumbrances 0      
Land 6,369      
Buildings and Improvements 13,739      
Net Improvements (Retirements) Since Acquisition 2,386      
Gross Amount Which Carried        
Land 6,366      
Buildings and Improvements 16,128      
Total 22,494      
Accumulated Depreciation at December 31, 2023 $ 10,881