1144 Fifteenth tower to be the 5th tallest in Denver In proximity to LoDo and Denver’s CBD, 1144 Fifteenth Street is a forty-storey office tower comprising twenty-seven floors of Class-A office space atop a thirteen-storey podium. Project Profile: 1144 Fifteenth Link: http://www.worldarchitecturenews.com/project/2014/24633/pickard-chilton/1144-fifteenth-in-denver.html