But the old Post Office was strong and solid. They all had to be fireproof and were constructed with a steel frame and with stone or brick. They had strong secure safes to insure the money, stamps and valuables won't be stolen.
Federal government assigned grade levels, based on the amount of mail handled, this then determined the size, Class A for the major metropolitan cities with highest volume of mail had to be on a major thoroughfare an "improvement to adjoining property."
Then there is the Class C post office building. "Brick facing with store or terra cotta trimmings, fireproof floors...public spaces restricted to very simple forms of ornament." This was the general classification architects had to work with that was proposed by Treasury Secretary William McAdoo in 1915.
Although the Post office in Henderson and Belton are still in use, they are no longer post offices.