A rare opportunity in the heart of downtown Mill Valley, 34 Sunnyside Avenue offers a unique blend of historic character, residential living, and income-producing potential. Originally built in 1908 as a single-family residence, the property has thoughtfully evolved into a versatile mixed-use building featuring three residential unitsa spacious 3-bedroom, 2-bath residence, a charming 1-bedroom, 1-bath apartment, and a studioalongside two street facing retail spaces that contribute to the vibrant downtown atmosphere. Whether you're seeking a primary residence with supplemental rental income, a multi-generational living opportunity, or a fully leased investment property with strong cash flow, this exceptional property offers remarkable flexibility. Tucked behind the building is convenient off-street parking and a private outdoor entertaining area, creating a peaceful retreat just steps from Mill Valley's renowned restaurants, boutiques, cafs, parks, and trails.