Philadelphia's first purpose-built mosque: Baitul Aafiyat Mosque. Geographic Center of Philadelphia.
This Ahmadiyya Mosque is Philly's first purpose-built mosque, with the first minaret (55 ft.) in the city. The site was once home to a National Biscuit factory, and supposedly sits on the geographic center of Philadelphia. Rich Olaya was the architect. This information is from Inga Saffron's column in the Philadelphia Inquirer, 11/30/18, pp. D1, 2.