A backyard home in San José has become California’s first Accessory Dwelling Unit condominium sale, giving homeowners a new real-world example of how an ADU can be sold separately from the main house.
The 749-square-foot home on Josefina Street, near downtown San José, closed for $530,000 in June, according to the City of San José.
The home was first converted into an ADU condominium in August 2025, which allowed it to be sold as a standalone property rather than remain tied to the main home on the lot.
For owners with backyard cottages, garage conversions, or newly built ADUs, the sale shows how one city is turning some backyard homes into ownership units, not only rentals or space for family.
The ADU Sold as Its Own Home
San José said the two-bedroom, one-bath ADU was developed by AlphaX RE Capital and sold as the first ADU condominium in California history.
Developers said the unit feels more like a small single-family home than a typical condo or townhouse because it has new construction, detached utilities, private parking, its own exterior entry door, and no HOA fees.
The sale gives smaller-home buyers another ownership option in an expensive market, while giving property owners a possible way to unlock value from a permitted backyard unit.
San José Was First To Approve ADU Sales
The sale grew out of California’s AB 1033, a law that allows local governments to adopt rules permitting ADUs and primary homes to be sold separately as condominiums.
San José became the first city in California to approve the sale of ADUs in July 2024, after the state approved AB 1033.
The city said its streamlined process allowed AlphaX RE Capital to move through permitting in 60 days, not counting applicant review time.
Homeowners Still Need the Right Local Rules
State law gives cities and local agencies the option to allow separate ADU sales, but the local government must adopt its own rules first.
A backyard unit may be legal to rent in many places, but a separate sale can require condominium conversion, parcel-map approval, new address assignment, HOA documents, recorded CC&Rs, lender review, and compliance with the city’s process.
Owners should confirm those requirements before spending money on plans, utilities, legal documents, financing assumptions, or sales projections.
San José Is Offering Homeowner Tools
San José said it created an ADU Condominium Checklist to help property owners see whether their properties may qualify for condominium conversion.
The city also has two ADU Ally positions in its Building Division to help residents navigate the process.
For homeowners outside San José, the first question is whether their city or county has opted into separate ADU sales. Without local approval, a backyard unit may still add rental income, guest space, or family housing, but it may not be sellable as its own property.
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