The Portland Building, alternatively referenced as the Portland Municipal Services Building, is a 15-story municipal office building located at 1120 SW 5th Avenue in downtown Portland, Oregon. Built at a cost of US$29 million, it opened in 1982 and was considered architecturally groundbreaking at the time. The building houses offices of the City of Portland and is located adjacent to Portland City Hall. It was added to the National Register of Historic Places in 2011.