The Old Post Office is a gateway to the City of Chicago. The architectural style of the existing structure is neo-classical with art deco influences. The 1.5 million-square-foot complex covers two city blocks and bridges the Congress Expressway placing it as a prominent feature in Chicago architecture. The Old Post Office contains three interconnected structures. The original building, on the east side of the site, is a six-story structure built in 1921. The balance of the structure, constructed in 1933, consists of a 12-story North Tower and nine-story South Tower. The exterior facade is limestone, except for the east elevation's center portion, which is brick and terra cotta. The property will contain 10,000 square feet of retail and restaurant space, 450 secured parking spaces (available 24/7) and a hotel. In addition, there are 56 restaurants and 6000 public parking spaces within three three blocks and the new Post Office is across Harrison Street to the south.