A dilapidated single-story house on Derby Street in southwest Berkeley, sold last December with a partially caved-in roof and official city blight tags, could soon be replaced by four three-story townhomes under new permits filed for the site. The proposal would subdivide the 5,319-square-foot lot at 1311 Derby Street into separate parcels and more than double the property's interior square footage, transforming a single quiet residential parcel into a small cluster of new housing.
The plans, first detailed by San Francisco YIMBY, describe a proposal from the private owners of the existing house and land that would turn the current single-story home into a new three-story residence, rising two stories higher than what stands there now, while adding a separate two-unit duplex on the subdivided land. The project site sits a single block's walk from San Pablo Park, and future residents would have access to transportation options along San Pablo Avenue and Sacramento Street. Further design details for the project have not yet been disclosed, according to the outlet's report.
A Fast Flip From Blight to Blueprint
The property's recent history shows just how quickly the lot moved from neglect to redevelopment target. Public real estate records show the 5,319-square-foot lot was purchased on December 10, 2025, for $635,000, according to Zillow. BAREIS MLS property disclosures reviewed by Coldwell Banker show the 1,034-square-foot house, built in 1922, was sold in non-habitable condition, with city tags reflecting its unsafe state at the time of sale.
Earlier planning permits filed in April by Oakland-based John Newton Design & Development had floated a different configuration for the same parcel, seeking to subdivide it into three lots for four three-story townhomes with three parking spaces, per the same account. That earlier filing invoked California Senate Bill 684, a 2023 law that streamlines local approvals and lot splits for urban infill parcels under five acres, allowing up to 10 housing units on qualifying sites. It remains unclear from available records how that earlier three-lot townhome concept relates to the current two-parcel proposal describing a redeveloped single-family home plus a duplex.
State and Local Rules Are Reshaping the Block
The Derby Street proposal lands amid a wave of state and local policy changes designed to accelerate exactly this kind of small-lot densification. Berkeley's Middle Housing Ordinance, which took effect on November 1, 2025, permits up to eight-unit, three-story residential buildings ministerially, without discretionary public hearings, across most city neighborhoods outside high fire zones. That local ordinance builds on California Senate Bill 9, enacted in 2022, which allows single-family lot owners statewide to ministerially split lots and construct up to two units per parcel exempt from environmental review under CEQA, as explained by Type Five.
The push for density is visible elsewhere on the same block and corridor. The Berkeley City Council unanimously approved an eight-story, 97-unit mixed-use apartment building at 2655 Shattuck Avenue at Derby Street last August, overruling neighbor objections about traffic and scale under state housing law constraints, Berkeleyside reported. Farther down the same block, City of Berkeley Zoning Adjustments Board records from August 2023 document earlier approvals for multi-bedroom single-family construction at 1515 Derby Street, showing that infill activity here predates the current wave of state mandates.
Part of a Countywide Bet on Small-Lot Housing
The Derby Street filing also fits into a broader regional strategy. Hoodline previously reported that Alameda County launched its SHIFT pilot program in December, using state streamlined housing laws to encourage four-to-16-unit infill developments on small urban lots throughout the county. If approved, the Derby Street redevelopment would increase both building scale and density at a site that, until recently, held a single crumbling house.
The financial backdrop for the project also reflects a cooling but still pricey local market. Real estate figures from Movoto reported in early 2026 put the median list price in West Berkeley at $899,000, an 8 percent year-over-year decrease. Whether the current two-parcel plan for a redeveloped home and duplex will move forward as filed, or shift again as it did between April and August, remains an open question, with construction timelines and final architectural details still undisclosed.
