“The Pennsylvania Academy of the Fine Arts has started work on a 277-seat hall that, in addition to being a venue for PAFA’s own activities, will host concerts, lectures, and other events by PAFA’s partner arts groups … and will be offered as a rental space to others seeking a small state-of-the-art venue.” Peter Dobrin talks to people with several organizations who believe that there’s an empty niche for a hall that size.