Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the assets:

Buildings
13 – 35 years
Building improvements
15 years
Tenant improvementsShorter of the term of the related lease or useful life
Acquired in-place leases or leasing commissionsRemaining terms of the respective leases
Computer equipment and other corporate assets
3 – 5 years
The following table summarizes depreciation and amortization amounts during the periods indicated below (in thousands):

Year Ended December 31,
202520242023
Depreciation on real estate held for investment and computer equipment and other corporate assets$63,177 $55,066 $44,402 
Amortization on acquired in-place lease assets and leasing commission costs
23,199 21,805 19,275 
Total depreciation and amortization expense$86,376 $76,871 $63,677 

Historical Timeline

Fiscal YearFiled
2025Feb 10, 2026Showing above
2024Feb 24, 2025
2023Feb 14, 2024
2022Feb 23, 2023

About PP&E Disclosures

The PP&E disclosure details a company's physical asset base — land, buildings, machinery, and equipment — along with the depreciation methods and useful life assumptions that determine how these costs flow through the income statement. Capitalization policy thresholds reveal management's judgment on the boundary between expense and asset, directly affecting both reported earnings and asset values.

Key signals: changes in estimated useful lives or depreciation methods can materially shift reported earnings without any operational change. Compare capital expenditures against depreciation expense — when capex consistently trails depreciation, the asset base may be aging and underinvested. Watch for large asset impairments or write-downs that signal overvalued carrying amounts. Asset retirement obligations reveal future environmental or decommissioning costs that are often underappreciated. Compare PP&E intensity (PP&E-to-revenue) against industry peers to assess capital efficiency and competitive positioning.