3-Bd. House w/ Porches, Roof Terrace, Grassy Garden & Seasonal River Views on Private Cul-de-Sac     This 3-bedroom, 3.5-bath, brick and clapboard house was built in the 1930s and sits at the end of a quiet, private cul-de-sac. It enjoys seasonal views of the Hudson River, and has plenty of outdoor space, including a grassy garden, a series of back porches and a large roof terrace.     Notable features include: a center hall; sunken living room with wood-burning fireplace; formal dining room; windowed kitchen; master bedroom suite; finished walk-out basement with a den/recreation room with fireplace, a guest or maid's room with bathroom and a large multipurpose room (possible fitness room or private office); slate roof; attached 2-car garage with a roof terrace above; 0.20-acre lot.     Near parks, schools, Metro-North trains and Express Buses to Manhattan.