California signed AB1033 into law in October 2023. The legislation did something specific and relatively overlooked: it allowed accessory dwelling units — the backyard homes and granny flats attached to residential properties — to be sold as individual condominiums, separately from the main house. StrataX Development, StrataX Development a San Jose real estate firm, saw the provision and built a business model around it.
The Bay Area housing shortage needs no lengthy introduction. Supply has fallen behind demand for years, land costs have pushed ground-up development out of reach for most developers, and first-time buyers face a market that has effectively locked them out of ownership. StrataX’s approach does not require new land. It requires underutilised residential properties, a renovation of the primary residence, and the construction of a high-quality ADU that can be legally separated and sold as a distinct unit.
“This model reimagines how existing residential properties can contribute to solving California’s housing shortage,” said Dave Simmons, StrataX’s chief executive. “By enabling ADUs to be sold as condominiums, we’re creating attainable homeownership opportunities while making more efficient use of existing land.”
The San Felipe initiative in San Jose demonstrates the model in practice. By working within existing zoning frameworks and aligning with AB1033’s provisions, StrataX has shown the approach can move from concept to completed project. In a city where land availability is limited and buyer demand persists, that speed relative to traditional development matters.
ADUs have historically played a narrower role in California housing — rental income for homeowners, multigenerational living arrangements, or occasional in-law suites. AB1033 opens a different possibility: the same physical structure as a pathway to ownership rather than tenancy. Housing analysts have increasingly identified this category as central to California’s broader supply strategy. Expanding ADUs from the rental column into the for-sale column could meaningfully change their impact, particularly for buyers priced out of the conventional market.
Challenges remain. Local municipalities must individually adopt AB1033 before developers can use it, and financing structures for ADU condominiums are still developing. Yet the underlying logic holds: California has millions of existing residential properties, many with land that could accommodate an ADU. Converting even a fraction of those into ownership units would add to supply without requiring the infrastructure investment of ground-up development. StrataX plans to scale as more municipalities adopt compatible policies. The model’s viability depends on that adoption — but the direction of California housing policy over the past five years suggests the trajectory favours it.
