Newton Green is the only Colonial county seat in New Jersey where a courthouse on its original site faces a town square or public green. In 1908, architect J.J. Vreeland added an upper story and Classical porch to the County Clerk and Surrogate Offices, which Brink and Knox built in 1859. The building became the County Park Building in 1930. The Romanesque Revival Hill Fountain was built of local limestone in 1895 through a gift from Joshua Hill, a native of Sussex County.