I think a big part of this math is avoiding huge balance sheet write downs on unoccupied real estate. When Amazon was heavily investing in SLU in the 2010's th

I think a big part of this math is avoiding huge balance sheet write downs on unoccupied real estate. When Amazon was heavily investing in SLU in the 2010's they purchased all of their leased offices from the developer, Paul Allen's company. It's the GE-ification of Amazon. Financial engineering with little care about employees or customers.