Katie Fay was thrilled to find somewhere to live in the Mile High City that would also be her workplace, gym and the hub of her social life. In February, the 31-year-old moved into X Denver, an apartment building at 3100 Inca St. in Union Station North. “I was sold on the place, one, because it was economical for two people with my roommate, and it was all of the amenities we wanted to start our own business.