Roll into Montauk Shores, the oldest mobile home park condominium in New York state, and you’ll see all the aluminum siding you’d expect. But here, in what they call “Montauk’s best-kept secret,” tiny plots can go for $1 million, thanks to the park’s stellar location: a bluff overlooking 1,000 feet of oceanfront in what’s arguably the most popular town in the Hamptons. Keep driving through the park (watch out for the kids and bikes and surfboards that are everywhere), and you’ll find one that belongs to East End designer Alicia Murphy. This thing does not look like it came off of a flatbed truck. Coated in cedar shingles, with white oak flooring and Thassos tile purchased in Southampton covering the interior, Murphy’s home also doesn’t look like it was prefabricated in a factory in Indiana. The 800-square-foot trailer is an L-shape, not quite a double-wide but a one-and-a-half-wide, an idea her boyfriend Chris Growney and their architect, Anthony Hobson, came up with to allow them to have two bedrooms and two bathrooms but still maximize outdoor space. Despite their sleek custom kitchen, you’ll find Murphy and Growney, along with his two boys and most likely a slew of friends, eating pretty much every meal outside in the generous dining area on the back deck.