One Post Office Square is a 40-floor modern skyscraper in the Financial District section of Boston, Massachusetts. The skyscraper is Boston's 10th-tallest building, standing 525 feet (160 m) tall. The building has approximately 766,000 square feet (71,000 m²) of Class A office space. An attached, eight-level parking garage offers 368 parking spaces and direct access to the building's lobby.