One of the most significant waterfront properties of our time has come available. Presenting 1.25 acres on Mercer Island's coveted Northend w/ 210 front ft & a 143 ft seaplane/yacht style dock. A Stephen Sullivan Long Island Shingle that truly embraces the architecture of NE coastal tradition. Exquisite craftsmanship & refined spaces flow to stone patios overlooking the most epic of sprawling lawns. A Great Room w/soaring ceiling & Epicurean’s dream kitchen. Dutch doors to veggie/flower garden. Rich paneled library opens to covered cigar porch. Poolside guest house boasts indoor & outdoor kitchens. 2 offices, 2 butler’s pantries, 3 laundry rms, billiard rm, wine cellar, putting green & boat house. Garage/indoor sport court w/ADU potential.