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Properties, Net
 3 Months Ended
Mar. 31, 2021
Real Estate [Abstract]  
Properties, Net Properties, Net
 
Operating properties, net consisted of the following (in thousands): 
March 31,
2021		December 31, 2020
Land$528,166 $528,269 
Buildings and improvements3,735,591 3,711,264 
Less: Accumulated depreciation(1,157,059)(1,124,253)
Operating properties, net$3,106,698 $3,115,280 

2021 Development Activities

During the three months ended March 31, 2021, we placed into service 46,000 square feet in one newly-developed property. As of March 31, 2021, we had 10 properties under development, including three partially-operational properties, that we estimate will total 1.4 million square feet upon completion.