Marriott Marquis Chicago (2121 S. Prairie) is thrilled to announce that it is officially open to the public. The largest hotel to open this year in Chicago, and the largest Marriott to open in North America in 2017, the property brings 1,205 guest rooms, including 44 suites, to the burgeoning entertainment and convention district of McCormick Square. Marriott Marquis Chicago is directly connected to the country's largest convention center, McCormick Place, and is adjacent to the new 10,000-seat Wintrust Arena.