The master plan for this four-acre hillside site outside of the Upstate New York town of Hudson includes a new guesthouse and pool adjacent to an existing contemporary house. The 20-foot-by-45-foot pool takes advantage of the property's Hudson Valley views, while the 950-square-foot guesthouse, nearly surrounded by a new meadow, forms an entry court with the main structure. A covered breezeway divides the guesthouse into two sides, one a gym for the homeowners and guests, the other a living-and-sleeping area for guests.