High Quality Content by WIKIPEDIA articles! The Custom House Tower - now Marriott`s Custom House Hotel - is a skyscraper in McKinley Square, in the Financial District neighborhood of Boston, Massachusetts, in the United States. Construction began in the mid-19th century; the tower was added in the 1910s. Standing at 496 feet (151 m) tall, the tower is currently Boston`s 17th-tallest building.