 He made an extended visit to Pennsylvania after the Revolution, from 1783 to 1788.He rented a Philadelphia city house and designed and built a country house, The Solitude, which survives as part of the grounds of the Philadelphia Zoo.He returned to England in 1789 with his 65% share of the ₤130,000 compensation for the loss of the family's unsold property of the proprietorship in Pennsylvania, a total of , which he shared with his cousin, John Penn.