We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:
Estimated Useful Lives
Buildings and building improvements
10-40 years
Land improvements
10-20 years
Tenant improvements on operating propertiesShorter of remaining useful lives of assets or related lease term
Equipment and personal property
3-10 years
Operating properties, net consisted of the following (in thousands): 
December 31,
20252024
Land$519,256 $495,707 
Buildings and improvements4,663,198 4,395,063 
Less: Accumulated depreciation(1,682,367)(1,537,293)
Operating properties, net$3,500,087 $3,353,477 

Historical Timeline

Fiscal YearFiled
2025Feb 20, 2026Showing above
2022Feb 24, 2023
2021Feb 22, 2022
2020Feb 12, 2021

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.