Built for Louise Grace—daughter of NYC’s two-time mayor and shipping magnate William R. Grace—this stuccoed Renaissance Revival cottage is a rare surviving example of an early American summer estate, set on 3,570 feet of private Maine shoreline.

Steen Valetje was built in 1851 to celebrate the wedding of Franklin Hughes DelanoI and Laura Eugenia Astor on land that was gifted from her father, William Backhouse Astor, who owned the neighboring estate of Rokeby.