Apparently, parts of the Carpenters Building live on, at a price.
Some person or persons doing business on eBay as "St. Louis Architectural Artifacts" (not to be confused with the upstanding St. Louis Architectural Art Company) has a "Terra Cotta atomic circle in a square" listed for sale. An annotation reads: "Terra Cotta atomic circle in a square 19 inches by 18 inches by 4 inches thick circa 1920's came from Carpenter's hall on Grand and Martin Luther King St Louis Mo."
Minimum bid is $600.00. Presumably, this person has had more pieces of the building, but most of them probably aren't in St. Louis.