In the heart of Denver’s Theatre District, the city’s fourth tallest building is steadily rising from the ground. The 42-story, 603-foot-high LEED Pre-Certified Gold building, called 1144 Fifteenth, is the first Class A office tower built in the downtown area in more than 30 years. The soaring glass structure is an emblem to the city’s future.

The building will rise above the rest – literally and figuratively. However, securing its strong foundation presented a long list of challenges. …