Thanks to George Sheldon, in the comments below for this update. Not an Iwanoff, but he was part of the project team. Rather, it is the Kamien house by Krantz & Sheldon, Architects. Robert Sheldon and Iwan Iwanoff worked on the project. Takes a similiar approach to siting as the Golovin house, which rises against the slope, and the same large single pitch roof is used. The entry detail, a curved semi enclosed portico, protruding out the side of the building is great.