The League defines a membership eligible historic theatre as one that is at least 50 years old and includes at least one of the following attributes: is an architecturally significant structure deemed worthy of preservation, has played an important role in the history of American stage and screen, and/or can be used as a performing arts facility. Theatres younger than 50 years old but possessing one or more of these attributes who wish to join are also considered. An official historic marker or designation is not required to join.
Updated 01.04.2024