For the past decade, Gary DePersia has considered himself fortunate to represent and sell the homes being built in the Hamptons by M & M Custom Homes, an organization founded some 15 years ago by Marc Underberg and Michael Axelrod. Starting with the development of real estate and the building of houses on the Gold Coast of Long Island and western Suffolk county, M & M Custom Homes came out to the Hamptons a decade ago to offer exceptional homes, both north and south of the highway, from East Hampton to Southampton.