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Real Estate Property, Net and Other Property, Net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Real Estate Property, Net and Other Property, Net Real Estate Property, Net and Other Property, Net
Real estate property, net as of December 31, 2020 and 2019 includes the following (in millions):
20202019
Land$769.6 $768.8 
Buildings696.0 692.4 
Other property improvements84.1 79.0 
Subtotal1,549.7 1,540.2 
Accumulated depreciation(154.4)(127.5)
Real estate property, net$1,395.3 $1,412.7 
Other property, net, as of December 31, 2020 and 2019 was as follows (in millions):
20202019
Land$39.3 $38.4 
Buildings18.5 19.7 
Asphalt plants, machinery and equipment104.4 105.5 
Water, power and sewer systems19.7 30.6 
Other property improvements6.4 6.8 
Subtotal188.3 201.0 
Accumulated depreciation(77.5)(76.6)
Other property, net$110.8 $124.4 
As noted in Note 2, the Company may capitalize a portion of interest costs incurred to long-lived assets for developments, major redevelopments and other projects that meet certain criteria. Total interest costs incurred were $30.6 million, $34.1 million, and $35.9 million in 2020, 2019 and 2018, respectively. Capitalized interest costs related to development activities were $0.3 million, $1.0 million and $0.6 million in 2020, 2019 and 2018, respectively.
Depreciation expense for the years ended December 31, 2020, 2019 and 2018 was $38.8 million, $35.6 million and $32.5 million, respectively.