 The Museum House is cast in Classical Revival style and was the last outbuilding constructed for Isaac Ellwood on the property. Today the Museum House's exterior appears much the same as it did when it was newly constructed but for many years the structure was badly deteriorated. After Harriet Ellwood died in 1910 the objects remained inside the building while it began to decline. By 1934 the building was in serious need of repair and by the 1970s both porches were gone and the only way into the building was through the north door. The museum house restoration was undertaken more than ten years later. Prior to the addition of the Visitors Center to the Carriage House, the Museum House served as the visitors center and housed staff offices.
