Apartments are popular in college towns and in the larger cities. The statewide average monthly rent is $653, but can be much higher in Denver, Ft. Collins and Boulder. Those cities have a higher population and get between $683 and $956 for rent monthly. Apartments are in the form of multi-level buildings, high rises and condos or townhouses. The need for condos and townhouses continues to grow as the baby boomer generation moves out of large housing and into golf course and resort communities.