# House Hacking in South San Francisco (94080): Live inside the biotech engine at a still-affordable median · The Rent Hacker > South San Francisco 94080 for house hackers: The Peninsula's deepest jobs-in-ZIP overlap: a live-inside-the-biotech-engine ZIP with an electrified Caltrain st Canonical: https://therenthacker.com/house-hacking/south-san-francisco-94080/ Source: The Rent Hacker (https://therenthacker.com/). License: RSL, attribution required — https://therenthacker.com/license.xml --- [Peninsula guide](/house-hacking/peninsula/) · Tier S · Rank #2 of 28 # House hacking in South San Francisco (Downtown / East of 101). The Peninsula's deepest jobs-in-ZIP overlap: a live-inside-the-biotech-engine ZIP with an electrified Caltrain station in an already-building downtown upzone, at a still-affordable ~$1.2M median. **Status check:** Verified 2026-07-16: every core catalyst (DSASP, 40 Airport Blvd, Grand Boulevard Initiative, Lindenville) confirms as documented. The standout is Genentech: a headquarters expansion approved at nearly double the prior estimate, 9M sq ft up from 4.7M, a $3–5B multi-phase program with Phase 1 possibly starting within the year. Kept at S. ## What's actually happening in 94080 - Operational, growing East of 101 biotech district in-ZIP: more than 25,000 people at over 250 biotech companies, Genentech HQ, 8.5M+ sq ft operating with ~3M sq ft approved over ~10 years. A free city shuttle and the Oyster Point ferry connect residential SSF to the jobs core. [City of South San Francisco](https://www.ssfca.gov/our-city/biotech/about-ssf) - Adopted, already building Downtown Station Area Specific Plan: adopted Feb 2015 and carried into the Shape SSF 2040 General Plan; doubles downtown housing (~1,400 units) plus 1.2M sq ft office/R&D within a half-mile of the station, with ~1,235 units entitled or constructed along Airport, Grand, Cypress, and Linden. [Home for All SMC](https://homeforallsmc.org/south-san-francisco-station-area-specific-plan/) - Delivered / operational Caltrain electrification ($2.44B, operational) plus the SSF Station Improvement Project (complete Jan 2022, ~$59M: 700-ft island platform, east-west underpass, West Plaza) knitting the downtown to the East-of-101 jobs core. [Caltrain](https://www.caltrain.com/news/cost-caltrain-electrification-increases-project-track-2024) - Entitled Near-station pipeline: 40 Airport Blvd (291 units, 8 stories, entitled) and a ~70-unit Newlife project. [Home for All SMC](https://homeforallsmc.org/south-san-francisco-station-area-specific-plan/) - Adopted Grand Boulevard Initiative corridor upzoning along the western El Camino frontage (Sunshine Gardens); the GBI Action Plan was adopted Jan 2026. [Grand Boulevard Initiative / SamTrans](https://www.samtrans.com/projects/gbi) ## The numbers Median price ~$1.20M (Zillow ZHVI); SFR broadly $1.1M–$1.6M+ Market rent all-bed ~$3,200/mo (Zumper, Feb 2026) Property tax (San Mateo County) 1.26% combined effective average (range 1.08–1.52% by tax-rate area; purchase resets the assessed basis to sale price) Per-bed rent band $1,300–1,800/mo per bed (biotech furnished) ADU rent band $2,600–3,200/mo Whole-home rent band $4,200–5,200/mo whole-home Underwriting vacancy 3–4% underwriting vacancy Appreciation scenarios 3.0 / 4.5 / 6.0 %/yr (conservative / base / upside) Fast DOM; entry runs through older Old Town duplexes and triplexes or SFR plus ADU. AB 1482 only. Appreciation basis: Base tied to the DSASP ~1,235 units realized plus 25K in-ZIP biotech jobs. Rent bands are city-level medians; confirm the specific parcel before trusting any of them. [Run your own scenario in the calculator](/calculator/). ## Buildings we underwrote in 94080 5 buildings in 94080 carry a record. 0 beat renting and index funds, 1 rejected; the rest did not. Every row links to its own page, with the numbers it was scored on. Property At our defaults Status [324 Susie Way](/property/rh-mlpgfd/324-susie-way/) 4 units · $1,795,000 −$493,859 S&P 500 Underwritten — the index wins at our defaults [335 A St](/property/rh-xpxj2o/335-a-st/) 2 units · $1,150,000 −$719,406 S&P 500 Underwritten — the index wins at our defaults [530 Baden Ave](/property/rh-jof7o0/530-baden-ave/) 2 units · $1,375,000 −$790,109 S&P 500 Underwritten — the index wins at our defaults [632 1st Ln](/property/rh-wy2v5u/632-1st-ln/) 4 units · $2,700,000 −$2,797,606 S&P 500 Underwritten — the index wins at our defaults [454 Railroad Ave](/property/rh-ys7x3f/454-railroad-ave/) — no verdict on file Rejected — Out of scope: after this week's run, the listing record we verified showed it has 6 homes. We underwrite residential buildings of two to four homes only, so it is not on the board. The full [board](/board/) shows every region's current week; this table is every record we hold for 94080, newest basis first. ## The house-hack angle A jobs-anchored appreciation and rent-demand play rather than a cheap-multifamily hunt. Three lanes: an ADU or SB 9 add on a western SFR near El Camino or BART, room-by-room to biotech commuters (furnished-room demand is strong), or an older Old Town duplex or triplex capturing the DSASP and Caltrain premium. ## What breaks it - Biotech is cyclical: lab-space overbuild or funding cycles could soften the jobs leg (stress room rents down 10–15%) - Whole-fourplex inventory is rare and expensive - ADU construction cost on 1940s–60s stock This page is the standing analysis. The weekly part, actual South San Francisco-area listings that pass the math, lands on the Peninsula board every Thursday. [This week's Peninsula board](/board/sf-peninsula/) [This week's Peninsula board](/board/sf-peninsula/) · [Read past Peninsula issues](/issues/sf-peninsula/) · [Every pick, on the record](/track-record/) · [How a deal becomes a pick](/methodology/) Data synthesized 2026-07-05, catalysts re-verified 2026-07-16. Mortgage-rate basis: 6.43% (Freddie Mac PMMS, week of 2026-07-02). Sources are the public planning documents and market listings named above, fetched on the synthesis date. Nothing here is investment advice; every deal needs a bindable insurance quote and parcel-level verification.