Decorated with or having the architectural structure of an entablature, which is the horizontal part of a classical building that sits on top of columns.
From 'entablature' (the architectural term) + '-ed' (past participle/adjective suffix). Entablature itself comes from French 'entablement,' derived from Latin 'tabula' (board, table), referring to the horizontal elements forming a platform or framework.
Ancient Greek and Roman architects developed this fancy arrangement of horizontal pieces on top of columns so precisely that it became a symbol of classical beauty—so 'entablatured' basically means 'adorned with the fancy top part that makes a building look sophisticated.'
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