In June 1917, Rockefeller announced that Fort Tryon Park would be given to the city on the conditions that it be joined to the existing Fort Washington and Riverside Parks, and that the city maintain the park. To preserve the views from Fort Tryon Park, Rockefeller had purchased land on the opposite side of the Hudson to keep it from being developed; this later became Palisades Interstate Park. Under Rockefeller's proposal, the park would be deeded to the Palisades Interstate Park Commission, which would also operate Palisades Interstate Park. Rockefeller also planned to run a ferry service across the Hudson River between Fort Tryon and the Palisades, located on the river's western bank. Mayor John Purroy Mitchel was positioned to accept Rockefeller's offer. However, his successor John Francis Hylan ultimately did not accept the land, saying that the site had not been "improved". Moreover, the city had failed to propose a law that would have deeded the parkland to the Palisades Interstate Park Commission. In 1925, Hylan told one of Rockefeller's advisors that the city would consider another proposal to give the land to the city for use as a park. Following this, Rockefeller again offered the land to the city in 1926, though without success.