My understanding of Virginia law, which I believe trumps canon law, is that a congregation, on voting to leave a demonination carries its church property with it. I would be interested to know what entity is listed on the title for Falls Church, and the other congregations of the old Truro Parish.
here is the property record:
Owner: FALLS CHURCH EPISCOPAL CHURCH
http://property.fallschurchva.gov/public/ieprop.htm