A rare 30-foot-wide Park Slope brownstone just one block from Prospect Park, 870 President Street offers extraordinary scale, elegance, and possibility in one of Brooklyn's most coveted locations. Set behind a gracious front yard and classic brownstone facade, this expansive three-story home offers six bedrooms and three baths, with a windowed basement below, a fabulous terrace above and central air. Currently arranged with a flexible first-floor one-bedroom suite and a spacious upper duplex, the house offers a wonderful opportunity to create a grand single-family home of remarkable width, volume, and character. Up the front steps, double wood doors open to a vestibule and generous gallery-style foyer with rich woodwork, a stately fireplace, and striking floor tilework with mosaic accents and border. The first floor is currently used as a large one-bedroom apartment, but could easily be reincorporated into the rest of the house. This level includes a front bedroom, large living room, formal dining room, full bath, excellent closets, and an enormous rear kitchen extension measuring over 24 feet long. With three exposures, the kitchen is unusually bright, creating a beautiful sense of openness at the rear of the house and connecting to a deck and garden beyond. A grand skylit staircase rises through the home to the upper floors, where oversized north and south-facing windows, high ceilings, hardwood floors, tasteful wood details, built-ins, and decorative fireplaces create warmth and elegance throughout. The second level features a gracious living room, two bedrooms, a full bath, and an eat-in kitchen that opens directly to an incredible roof terrace with wood decking, fencing, and pergola. This private outdoor space functions like an open-air room, perfect for entertaining, dining alfresco, gardening, or quiet evenings above the treetops. The third floor offers three generously proportioned bedrooms, extensive closet space, a large windowed laundry room, full bath, and a separate office. The rear bedroom connects beautifully to the office, making the layout especially well-suited for working from home, guests, play space, or future reconfiguration. Below, the windowed basement offers exceptional potential, with ceiling heights of approximately 8'8", multiple storage areas, mechanicals, and tremendous flexibility for future recreation, studio, gym, or utility space. Beautifully maintained, exceptionally charming, and unusually wide, 870 President Street presents a rare opportunity to create a spectacular Park Slope home with scale, light, outdoor space, and flexibility already in place. While legally a two-family, the home is most naturally suited to be enjoyed as a substantial single-family residence or reimagined to meet the next owner's needs. Just one block from Prospect Park West and the lush greenery of Brooklyn's most treasured park, the home is moments from Grand Army Plaza, the weekly farmers market, vibrant 7th Avenue shops and restaurants, the Brooklyn Museum, Brooklyn Botanic Garden, and Brooklyn Public Library. This is Park Slope living at its most elegant, spacious, and enduring.