EXCLUSIVE NEW LISTING  4-Bd. Dutch Center-Hall Colonial with Landscaped Garden & Wraparound Patio on Leafy Cul-de-Sac    With its gambrel roof, shuttered windows and lushly landscaped, terraced garden, this 4-bedroom, 2.5-bath, Dutch Colonial Revival-style house sits along a leafy cul-de-sac. Built in the 1930s, it enjoys a multilevel wraparound patio on the north side of the house and a triangular grassy lawn on the south side.    Standout features include: a center hall; southern sunroom; living room with marble wood-burning fireplace; formal dining room with sliding glass doors to the patio and garden; eat-in kitchen with a pass-through; full unfinished basement with laundry; walk-up storage attic; 1-car garage and off-street parking for 3 cars; 118-by-111-ft. triangular corner lot.    Conveniently situated for shops, parks, Metro-North trains and express buses to Manhattan's East and West Sides.