This Mennonite meetinghouse serves a congregation founded in 1688, the oldest in the nation. The gabled one-story stone building for a German Pietist group is plain, as are the early Quaker meetinghouses, differing principally in the placement of the entrance on the short face. A similarly plain meeting for the Church of the Brethren (also known as Dunkards) stands at 6613 Germantown Avenue. The Mennonite Meetinghouse was substantially altered and enlarged by Schaef in 1915, but the historical building can still be readily determined. It is noteworthy that German-based congregations continued to dominate along Germantown Avenue and hired German-surnamed architects into the twentieth century.