One Monument Square

One Monument Square
The building in 2024
One Monument Square
Location within Maine
General information
TypeHigh-rise building
LocationPortland, Maine, U.S.
Address1 Monument Square
Coordinates43°39′27″N 70°15′31″W / 43.6575°N 70.2586°W / 43.6575; -70.2586
Completed1969 (1969)
LandlordFinard
Technical details
Floor count10
Floor area124,671 sq ft

One Monument Square is a ten-storey office building located in Monument Square, Portland, Maine. It stands at the former location of the United States Hotel, which was one of the oldest hotels in the city, having been in business for 97 years. It was demolished in 1965, and replaced four years by the current structure, with a plaque in front denoting the site as the former location of the hotel.