SB 79 transit-oriented density: the tier framework

SB 79 (2025) is the state's transit-oriented development law: within specified distances of qualifying transit stops, minimum allowable densities and heights apply as a floor under local zoning, tiered by transit quality and distance. This page is a curated snapshot as of July 2026 and deliberately qualitative — the exact tier tables belong to the statute, chaptered into the AB 2011 / SB 79 by-right housing text in the library, and that text is what to underwrite from.

The framework matters because it moves the base: where an SB 79 tier sets a higher floor than the local zone, that floor becomes the starting point — and the § 65915 density bonus then computes on top of it. HCD's fact-sheet series for the by-right statutes — see the AB 2011 fact sheet — is the pattern to watch for SB 79 implementation guidance as the law phases in.

Two dials set the floor. Transit quality: the strongest tiers attach to heavy rail and the most frequent, highest-capacity service, stepping down through light rail, bus rapid transit and frequent commuter service to qualifying frequent-bus stops. Distance: each qualifying stop projects bands outward, and the band closest to the platform carries the most capacity, stepping down toward the edge of the walkshed. Strong transit plus a close-in site produces the highest state minimums; weaker service or the outer band produces lighter ones. Where local zoning already allows more than the applicable floor, local zoning simply keeps governing — SB 79 is a floor, not a ceiling.

The floors don't attach to every parcel near a stop. The statute runs eligibility screens — site and zone conditions keyed to urban context and zones where residential or mixed use belongs, carve-outs for hazard and resource overlays, and tenancy protections that keep sites with recent residential tenancies or rent-restricted units from being redeveloped over displaced tenants — plus distinct treatment for transit-agency-owned land. Locals get implementation flexibility rather than an opt-out: the law contemplates locally adopted TOD alternative plans that can reshape where the capacity lands, subject to state oversight, and it phases in on statutory timelines through 2026 and beyond. The screens are lists in the text; read them as lists, not vibes.

• Underwriting watch-outs:
• Tier assignment turns on how the stop is classified, and service frequencies change — verify the stop's qualifying status, not just its distance on a map.
• The screens are conjunctive: one failed site condition can pull a parcel out of the framework entirely.
• A local alternative plan can move the floors parcel by parcel — pull the city's implementing ordinance, not just the statute.
• The law is new (chaptered 2025): expect cleanup amendments and agency guidance; re-verify before locking a residual land value on an SB 79 basis.

The arithmetic is base-then-bonus. Where SB 79 applies, its floor functions as the maximum allowable density for § 65915 purposes: the affordability set-aside is computed on that larger base, the bonus percentages ride on top, and concessions, waivers and the parking maximums follow as usual. Against the broader Zoning Law, the state floors override contrary local density and height limits while other objective local standards generally continue to apply — which is exactly the seam where disputes will live.

The site check, in order: (1) map the qualifying stops and their distance bands around the parcel; (2) classify each stop to find the governing tier; (3) run the statute's eligibility screens against the site; (4) compare the SB 79 floor to the local zoning envelope and take the greater; (5) layer the density bonus on the winner. Steps 2 and 3 are where the money is — and both resolve only in the chaptered text, which carries the exact tier tables this page deliberately does not paraphrase.