This new construction modern masterpiece, designed by sought-after Richardson Pribuss Architects and built by Eastwood Development, sits in one of Mill Valley's most premier locations. Built on a sunny knoll, the property offers privacy, full southern exposure, 900 square feet of flat artificial lawn, and large views of the valley and the Mount Tamalpais ridge. The open floor plan boasts tremendous scale, large walls of glass, and indoor/outdoor flow from both levels of the home -- perfectly suited for today's modern lifestyle. Rarely does an opportunity like this present itself in this location. The 5 bedroom, 4.5 bathroom home offers the perfect shelter-in-place solutions for a home office, a separate homework space, a home gym, and an au pair/in-law. The flexible floorplan gives you limitless possibilities and a vacation-like experience. An extremely large Ipe clad deck with LaCantina collapsible walls of glass offers outdoor dining and sitting areas to take in the spectacular views of Mount Tam and ridgeline – the perfect place to entertain and watch the sunset. Thinking about hiring that au pair or entertaining in-laws and guests? 315 Tamalpais has an ADU with separate entrance complete with a second kitchen, a bedroom, a full bathroom, and sitting area. Don't plan on hosting long term guests? Transform this space into a spacious home office and Peloton workout room. The low-maintenance landscaping, oversized windows, and large two car garage with an additional three off-street parking spaces makes living here and entertaining guests an absolute breeze. With soaring high ceilings and flat walk out space off of both levels, this new construction home will not last long! The property offers a metal roof, cedar siding, air conditioning, and speakers throughout. The recently finished build site also offers hook-ups for an outdoor kitchen located just off the great room and a spa-like sanctuary on the deck of the primary bedroom.