A $5$ story commercial building has $20,000$ sq$.$ ft$.$ per floor and the rent is $$20/$sq$.$ ft$.$ for rentable floor space. Consider the following factors: Areas which are not part of a tenants lease $($i$.$e$.$ rentable space$)$ include: Lobby $=5000$ sq$.$ ft; Mechanical rooms on each floor $=200$ sq ft$.$ There are two stair towers in the building. Each of these features is $500$ sq$.$ ft$.$ Halls account for $10\%$ of net space after making all the reductions listed above. Based on net rentable floor space, what is the total rent received by the owner of the building?