Quadrangle Club was the next to build. In 1916, Quad sold off the McCosh House and began erecting a Georgian clubhouse designed by one of its board members, Henry Milliken '05. (The McCosh House was moved to 387 Nassau Street, east of Harrison Street, where it still stands.)

Milliken's Quad Club is a valiant but ultimately unsuccessful effort. For example, the heroic scale of the entrance portico, modeled on the famous "Westover" in Tidewater Virginia, overpowers the rest of the facade. Meanwhile, the busy row of small attic- style windows on the second floor make Quad seem somewhat squat, almost as if it were missing a floor.

In the context of the development of Prospect Avenue, though, perhaps the most significant thing about Quad is that it does not even attempt to approach the monumental proportions of Colonial or Cottage. The Georgian style was still deemed appropriate for a club, but on a reduced scale, and thus Quad mirrors the overall trend toward restraint in club architecture.