The incomparable Roundhill Estate located at 110 Gilmartin Dr Tiburon CA. Approximately 3 acres of exquisite park-like landscaping, lavish recreational facilities and retreat-like privacy. Main residence of approximately 10,500 sq. ft., including 4 bd, 4 ba guest/children’s wing, enormous master suite, theater and solarium. Separate 4 bd, 4 ba staff quarters, separate guest house/gym/office, tennis court, 2 pools, 3 spas, hydrotherapy waterfall, stream, huge level lawn and view of SF financial district through GG Bridge. Adjacent, approximately ½ acre vacant lot (03-171-08) included. Nothing else like this.