3 IS A MAGIC NUMBER. Fully renovated sponsor sale, open plan, three bedroom, two bathroom co-op with two breezy exposures. No board approval needed.  Take the elevator from the marbled lobby and exit onto the large 4th floor landing of this well cared for, pre-war co-op building in the heart of Prospect Heights. The entry of the apartment has space to transition to the open kitchen, dining and living areas. With ample counter space, this renovated kitchen has enough room to prep, cook and entertain. The kitchen features custom maple cabinets, marble counters, top of the line stainless steel appliances, built-in microwave, dishwasher and washer/dryer. The dining area, which can easily accommodate a large gathering, adjoins the bright and spacious living room. High ceilings, beautifully preserved hardwood floors and recessed lighting give a feeling of unencumbered space. Two bedrooms face south and share a hall bath while the master bedroom has a full bath en-suite. Excellent closet/storage space and a compact washer and dryer round out this amply sized coop apartment.   Built in 1924, this 35 unit, elevator, co-op building is pet friendly and shares a lovely landscaped courtyard with its sister building 418 St Johns Place and features a live-in superintendent, storage, bike storage, and a fitness area. Prospect Park, Brooklyn Public Library, Brooklyn Botanic Garden, The Brooklyn Museum, Saturday Farmers Market at Grand Army Plaza and the Park Slope neighborhood are just a stones throw away. Many restaurants, cafes, bars and shops are nearby plus the 2,3 trains are the closest subway lines, just 1.5 blocks away. The B,Q and 4,5 trains are also nearby.