Massive income-producing Boston-area 3-family with a bonus upper 4th unit already in place on the Mattapan/Hyde Park line. This pristine, well-maintained, turnkey multifamily is a true trophy asset along Cummins Highway—ideal for investors, portfolio expansion, owner-occupants, or a seamless 1031 exchange. The property features a brand-new roof (installed just months ago), strong systems and mechanicals, spacious layouts, hardwood floors, quartz countertops, renovated bathrooms, large bedrooms, and off-street parking. The top-floor bonus unit offers immediate upside and the potential to operate as a 4-family. Taking it even further, the basement boasts ceiling heights approaching 9 feet, presenting a compelling opportunity for a potential 5th unit (buyer to perform due diligence). Conveniently located near multiple bus lines, Blue Hill commuter rail, Mattapan Station with Red Line access, local shops, restaurants, and easy routes into Downtown Boston. A rare, high-upside opportunity!