In the late 1950s, the park was greatly expanded in response to the proposed Interstate 80, which would pass just south of the park. These land acquisitions maintained the integrity of the site. The Birthplace Society moved a 1905 house to the park in 1964 to serve as the house of the Director of the Presidential Library. The house has since been transferred to the Herbert Hoover Presidential Library Association, who use it as offices. Around the same time, the Birthplace Society moved the Quaker Meetinghouse to the site. Although the Hoovers were originally opposed to the idea, since the church was originally far from the house, they relented when learning of a demolition threat. It was the last building moved to the site before Hoover's death.