This is a Postclassic palace on the Island of Cozumel, Mexico, much like Postclassic palaces at Mayapan.
Built out of stone is a foundation, columns to support a thatch roof and a back wall. In the front of the thatch roof and columns was a "false front" with carved plaster that may have looked quite a bit like the carved stone fronts of Classic palaces which had thin coats of plaster over the carved stone. But beyond looks there is another issue . . .