The Copernicus Center (formerly Gateway Theatre) is a 1,890-seat former movie palace that is now part of the Copernicus Center in the Jefferson Park community area of Chicago in Cook County, Illinois, United States. The Copernicus Center is located at 5216 W. Lawrence Avenue. The former Gateway Theater was designed by architect Mason Rapp of the prestigious firm of Rapp and Rapp, famous for their design of deluxe theaters not only in Chicago (Chicago, Oriental, and Palace Theatres) but throughout the United States. It is the architect's only surviving atmospheric theatre in Chicago.