One Magnificent Mile Condominium Association, also known as One Mag Mile or One Magnificent Mile is a mixed-use retail, office and residential skyscraper in downtown Chicago, Illinois. The building was aptly named after its location at the head of the Magnificent Mile shopping corridor immediately adjacent to the exclusive Oak Street shops.

The 57-story building has 58,734 square feet of retail space on the first three levels, and 341,470 square feet of office space on its middle floors 4 through 19. The mechanicals for the entire structure are housed on floors 20 and 21 along with a swim club and fitness center serving the 181 private residences on floors 22–56. The lower level and sub-basement contain a parking garage. (wikipedia.org)