2408 N. Kedzie (Kedzie & Fullerton) ALL AGES Now, this venue is open to the public and is considered to be the best kept secret in Chicago. The Knights Templars Mansion can accommodate up to 400 guests. A stunning venue, The Mansion has 5000 sq. ft. of open space with 35’ ceilings, plaster moldings, and ornate décor. It's unique. It is perhaps the only mansion in Chicago that could accommodate such large number of guests in the same room.