One Monument Square

One Monument Square is a prominent ten-storey office building situated in the heart of Monument Square, Portland, Maine. This modern structure occupies the historic site of the United States Hotel, which was a beloved establishment for nearly a century before its demolition in 1965. Completed in 1969, the building features a plaque commemorating the hotel's legacy, making it a point of interest for tourists and researchers alike who wish to explore the rich history of Portland.