Custom House Tower - Boston's tallest building from 1915 to 1964

Custom House Tower was completed in 1915 as a vertical addition to the 1849 Custom House and served as Boston's tallest building until the Prudential Tower opened in 1964. The granite base and clock tower are prominent waterfront landmarks, and the tower was converted to a Marriott timeshare property with a publicly accessible observation level in the 1990s. The Custom House Tower is listed on the National Register of Historic Places and is a well-documented part of Boston's architectural history.