The Cassey House, at 243 Delancey Street (formerly 63 Union Street) at the corner of S. Philip Street in the Society Hill neiughborhood of Philadelphia, Pennsylvania, was owned by the Cassey family for 84 years (1845–1929). The Casseys were a prominent, prosperous, African-American family known for their activism in working for the abolition of slavery and against colonization &ndsah; the repatriation of free blacks to Africa – and their support for educational, intellectual, and benevolent organizations.