777 Main Street, Historic skyscraper in downtown Hartford, United States

777 Main Street is a 26-story skyscraper in downtown Hartford with a height of approximately 354 feet. The structure combines concrete and steel with numerous prefabricated window modules that define its appearance.

The Hartford National Bank and Trust Company, then one of Connecticut's largest banks, was persuaded by city planners in the 1960s to join the urban renewal project around Constitution Square. It committed $14 million to the scheme and had this tower built, designed by Los Angeles architect Welton Becket and constructed by George Fuller. Bank of America was the last corporate tenant, leaving in 2012; a $85 million conversion in 2014 created 285 apartments, and the building was listed on the National Register of Historic Places that same year.

The tower's name changed from the Hartford National Bank and Trust Building to 777 Main Street after its 2014 conversion. Its ground floor now holds expanded street-front retail space, and 285 apartments occupy the upper floors, twenty percent reserved for low- and moderate-income households.

The building now houses residential units, including options for people with lower incomes. The downtown location provides good accessibility and surrounds visitors with other urban facilities.

The building uses rooftop solar panels and a fuel cell to generate its own electricity and has earned LEED Platinum certification. This makes it an example of sustainable transformation of older structures.