In 1929 the Pennsylvania legislature authorized acquisition of the property by gift. In 1932 the Warner Company donated nearly ten acres of the property to the state of Pennsylvania as a site for a permanent memorial to Penn. The Pennsylvania Historical Commission was given responsibility for it. The legislature appropriated money to reconstruct the buildings of this estate in a historically accurate manner, to create a house museum in 1939. Over the decades, more land was acquired, and the property now has a total of . The property was placed on the National Register of Historic Places on October 28, 1969. The manor house and grounds are administered by the Pennsylvania Historical and Museum Commission in association with The Pennsbury Society, and are open to the public.