Thats the old East Moriches NY station on the Long Island Railroad, apparently some dudes living in it now.
Am not familiar with the lay of Long Island. Is this building still in it's original place? Tracks near by? Seems a bit set back, if once track side? Boxcab E50
Yup, this building is in its same location as it was built, the tracks are very close, only behind the row of shrubs, the person who owns the land also has converted where the parking lot/platforms used to be into his lawn.