Denver. Buildings. One Denver place Twin-tower skyscraper to be built between Champa and Curtis, 18th and 19th Sts. annouced by Denver Urban Renewal Authority. Post Ag 4, 1977 p.1 DURA gives tentative OK to twin office skyscrapers at 180 between Champa and Curtis; called One Denver Place. RMMN Ag 5, 1977 p.38 Construction begins on $35 million first phase of twin-tower office complex at 18th and Champa. Post Je 14, 1978 p.39