This is a 19th century, Victorian style, architectural salvaged ornately framed mirror, that was likely used over a mantle. It would behoove you to research images of the Hotel del Coronado and Union Station to see if you could find a match to this mirror which add proof of where it came from originally. Though quite an impressive piece, these are a bit of a difficult sell as most home are not made to accommodate such a piece. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.