One Post Office Square is a 42-floor modern skyscraper in the Financial District section of Boston, Massachusetts.

[2] It overlooks Post Office Square Park and was designed by Jung Brannen Associates.

[3] The exterior is modern style sculpted tower that consists of a steel frame with a concrete aggregate facade.

[2] The three-story lobby is finished in patterned Rosso Verona and travertine marble walls and floors accented with mirror bronze signage, hand rails, and window bands.

[4] The building is connected to the adjoining Langham Hotel at ground level by a private passageway.