Boulevard in the foreground, facing southeast. Th Street 522 / Formerly known as MCI Plaza. 71 World Trade Center Denver Mixed-Use 200 / When ultimately completed, WTC-DEN - located in Denver's Five Points neighborhood - will provide over 250,000 square feet of office space, a conference center, a 260-room hotel, 30,000 square feet of retail and dining space, a public. Spire is currently Colorado's tallest all residential building. Tallest building in the Mountain States. 1, it stands as the 109th-tallest building in the United States, and the tallest building in the state of Colorado. 69 37 Country Club Tower III 328 / Topped off Spring 2017 with completion in late 2017. 72 Parq on Speer Residential 185 /. Twenty-nine of the thirty tallest buildings in Colorado are located in Denver. Proposed edit This lists buildings that are either Proposed or actively Under Design Review with the City County of Denver and that are planned to rise at least 30 meters (98 ft). 21 22 9 Hyatt Regency Denver at the Colorado Convention Center 489 /,100 rooms (60 suites).