It is indeed an early model '57 Oldsmobile, as it has the early exhaust exits through the bumpers, that caused GM so much warranty headaches. The later GM model's exited the tailpipes under the bumper, with Caddy being the only exception, IIRC. The gas filler door, with the "88" or "98" logo, is long gone! ;(
Homes here can come with two lawns... ;)