The Thomas Leiper Estate, also known as Avondale, is a historic American estate located in Wallingford, Pennsylvania. Built in 1785 by Thomas Leiper, the estate features a three-story yellow-stuccoed mansion house, a fireproof vault, communal outhouse, barn, carriage house, smokehouse, warehouse, tenant's house, and a quarry.
Designated as a National Historic Landmark in 1971, the estate offers weekend guided tours from April through December by the Friends of the Leiper House. Local schools, such as Strath Haven High School and Strath Haven Middle School, are named after this significant historic site.
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