At the time, Plymouth was a prosperous port town, separated along the coast of
Plymouth Sound from the neighbouring towns of
East Stonehouse and
Devonport; collectively known as the
Three Towns. Foulston was responsible for the creation of
Union Street from the
Frankfort Gate which was built across marshland to unite the three towns.
The Royal Hotel, Theatre and Assembly Rooms Foulston's
Royal Hotel, Theatre and Assembly Rooms were built between 1811 and 1818. The Athenaeum (1818–19) was bombed during World War II in 1941 and later demolished. Belmont House (c. 1825), The Proprietary Library (1812, destroyed by bombing, 1941), The Royal Union Baths (1828, demolished 1849 to make way for
Millbay railway station), In 1818 he designed the asterisk-shaped
Cornwall County Asylum at Bodmin, later known as St Lawrence's Hospital, and now a
Grade II* listed apartment building. In
Torquay he built the ballroom (1830, demolished), and in
Tavistock he restored the
medieval abbey gatehouse in
Gothic style. ==Later life and career==