Highest and best by Tuesday 1/6/2026 at 5:00 pm. Welcome to 644-646 New Britain Avenue, a rare and expansive 4,136 sq ft duplex located in Hartford's Behind the Rocks neighborhood. This large multi-family property offers 7 total bedrooms, 2 full bathrooms, and 2 half bathrooms across two spacious units. Each side features four levels of living space, providing exceptional layout flexibility and long-term value for owner-occupants or investors. The first floors include a kitchen, formal dining room, and living room, offering well-defined living spaces with classic architectural details. The second and third floors include the bedroom levels, with a full bathroom on the third floor. Both units also offer walk-up attic space, creating an opportunity to finish additional square footage and expand functionality, subject to local zoning and building requirements. The property includes full basements, separate front and rear entrances, and a rear yard with driveway access. While the home will benefit from some TLC, it presents significant upside potential with its size, layout, and room for improvement. Conveniently located near public transportation, schools, shopping, and major roadways, this duplex is an excellent opportunity to build equity or expand a rental portfolio in Hartford.