For nearly 40 years, Long Island native Jeffrey Collé has been designing and building some of the most beautiful homes in the Hamptons. Just in time for summer, his latest project, David’s Lane, is nearing completion and joining two other Collé-designed estates that are also on the market. Beechnut Hill Farm, $24.995 million Located in the enclave of Water Mill, this 18,000-square-foot estate sits on 42 acres and includes a six-stable horse barn. The seven-bedroom home features shingle-style architecture; m…