SB 79 & the Housing Transformation of the El Camino & Caltrain Corridor
active• sanmateo
San Mateo has more to gain — and more to lose — from SB 79 than almost any other Peninsula city, with two Caltrain stations (Hayward Park and San Mateo) and dense El Camino Real frontage squarely in the law's half-mile radius. SB 79 takes effect July 1, 2026, and in the Bay Area currently applies in San Mateo, Alameda, San Francisco, and Santa Clara counties — overriding local height and density limits to allow high-density housing near qualifying rail stops, with the greatest density within a quarter mile. The city is simultaneously managing a separate but related wave of office-to-residential conversions: several development proposals in San Mateo plan to demolish existing commercial structures to make room for housing — including the Clearview campus and 1650 S. Amphlett Blvd. — and a 12-story office building at 2121 S. El Camino Real will convert 156 apartments from the existing structure rather than building new. AB 507, effective mid-2026, streamlines ministerial approval for such conversions. The City Council adopted a new Residential Tenant Protection Program in December 2025, requiring landlords to provide written notice to tenants and include protective language in leases by February 1, 2026 — a recognition that rapid housing turnover along the corridor is creating displacement pressure on existing renters.
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Related cause: Development & Neighborhoods
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