441 Tamalpais Ave | Hillside House is a residential project completed by Zack de Vito Architecture + Construction. The 4,000-square-foot home is located in Mill Valley, California, USA. 441 Tamalpais Ave | Hillside House by Zack de Vito Architecture + Construction: “On The Market | Design/Build Development Project – 441 is a three-level, 4,000 sq ft. house in Marin County. The minimal, elongated facade mimics the axis of the road..