Wikipedia
Drumthwacket is the official residence of the governor of New Jersey. The mansion is located at 354 Stockton Street in Princeton, close to the state capital of Trenton. (It is one of only four official governor's residences in the country that is not located within its state capital; the other three are in Wisconsin, Tennessee, and Ohio.)
Drumthwacket and the surrounding land was sold to the state in 1966 and was designated as the governor's mansion in 1982. The estate is administered by the New Jersey Department of Environmental Protection. The non-profit Drumthwacket Foundation is responsible for preserving, restoring, and curating the house and grounds. In addition to being an executive residence, the home is also a historic house museum. It was added to the National Register of Historic Places in 1975.