Beall's Levels and Rock of Dunbarton, part of his landholdings, were surveyed in 1752 as a possible site for George Town (now Georgetown). Maryland offered Beall two lots in the town, along with the "price of condemnation" (remuneration). Beall protested the proceedings, though ended up accepting two lots. Maryland paid a total of 280 pounds to acquire the land from Beall, along with land owned by George Gordon.
Beall died on October 15, 1807 and was originally buried in a burial site alongside their home on N Street (at 31st Street). Around 1870, he was moved to the cemetery of the Presbyterian church in Georgetown.
- Ecker, Grace Dunlop (1933). A Portrait of Old Georgetown. Garrett & Massie, Inc. pp. pp. 1–6.
- Balch, Thomas Willing (1897). "Notes and Queries". Pennsylvania Magazine (Historical Society of Pennsylvania) XXI: p. 507.