[2] Knollwood was built in the 1910s for industrialist Lyman Gordon (1861-1914), cofounder of Wyman-Gordon, although he died before it was completed.

The main house is a 2+1⁄2-story stucco construction, topped by a complex hipped tile roof.

The central portion has a slightly recessed pavilion that rises a full three stories to a decorated gable.

The estate includes several outbuildings, also built c. 1914, which are styled similarly to the main house.

[2] The remnant portion of the estate has been home to the private all-girl Notre Dame Academy since the 1950s.