The Mar Thoma Shleeha Cathedral serves the newly established diocese of Syro-Malabar (Indian) Catholics in the United States.  The cathedral  serves as the center of activities for the 800+ families of Sryo-Malabar Catholics living in the Chicago area, and for the 100,000+ Indian Catholics following this rite in the United States and Canada.

Designed by JNA Architects, the new cathedral  features an octagonal, column-free worship space seating 1,165 people, as well as a daily chapel and reservation chapel.  A full basement provides a large multi-purpose gathering space for the community, and church offices and administrative spaces are located on the partial second floor.  The exterior design of the cathedral incorporates traditional forms that reflect the historic patrimony of the Catholic Church, including a classically inspired front façade featuring a triumphal arch entrance portico, a vaulted niche with a statue of St. Thomas, and a pediment roof.