Positioned on one of Downtown Petaluma's most coveted blocks, between B and D Street, 17 10th Street presents an extraordinary opportunity in the heart of the Historic District. Set on the largest parcel on 10th Street, the property spans an expansive and remarkably private approx. 13,400 sq. ft lot (0.30 acre). Representing one of the last largely preserved vintage opportunities on a parcel of this scale in Downtown Petaluma, this offering presents exceptional upside and true legacy property potential. The 3 bedroom, 1.5 bathroom main residence is complemented by an attached 1 bedroom, 1 bathroom unit, ideal for extended living, guests, or rental income. The approx. 1,700 sq. ft. main home offers a welcoming entry foyer that opens to an oversized living room with large windows, tall ceilings, a brick fireplace, and beautiful wood floors. A centrally located formal dining room showcases tall wainscoting with plate rail detail, timeless character, and a large French door leading to the exterior. Sunroom, interior mudroom, and more. Outdoors, the wrap-around grounds provide mature trees, privacy, outbuildings, and tremendous potential for future expansion, gardens, or the creation of an in-town retreat. The home is thoughtfully site placed to allow generous space and setbacks on all sides, a rare find within this premier downtown location. A long, paved driveway leads to a detached garage/workshop. Numerous updates include a replaced concrete perimeter foundation (2013), updated electrical panel and sub panel (2022), and replaced sewer lateral line. Rarely does a property of this scale, setting, and upside potential become available on a quiet block in Downtown Petaluma's Historic District.