Originally known as the Hathaway Warehouse, this historic 1857 building is one of the six oldest buildings in the city and is a designated historic landmark. Harbor Lofts was converted to residential use in 1996 and is now home to 46 residences at 400 Spear in the South Beach neighborhood. Notable features in the building include the large windows and age of the original structure.

Home sizes at Harbor Lofts range from about 500 square feet up to about 2,000 square feet. Homes are available in one- and two-bedroom loft-style layouts. Building amenities include elevator service and an interior courtyard.