Built about 1765, it is the only house known to have been owned by two signers of the United States Declaration of Independence, Founding Fathers George Clymer and Robert Morris, and as a headquarters of General George Washington during the American Revolutionary War.

[3][4] Summerseat is located west of the central business district of Morrisville, sharing a property with Patriot's Park at the junction of Hillcrest and Legion Avenues.

The main facade faces east, and is five bays wide, with a center entrance framed by pilasters and a fully pedimented gable.

[4] The house was built about 1765 by Adam Hoops[5] , and was owned by his son in law Thomas Barclay at the end of 1776, when George Washington occupied it as a military headquarters during the dark days of the New York and New Jersey campaign of the American Revolutionary War.

Morris fell upon financial hard times owing to failed real estate speculation, and sold the house in 1806 to George Clymer, another signer of the Declaration.