$7,750,000
501 El Cerrito Ave, Hillsborough 94010
Size check
The listing's square footage against the county assessor's record and the permits on file.
The listing and the county record agree within 10%.
What can explain a difference
- Space built without a permit.
- Permitted work the assessor has not recorded yet.
- An ADU, a finished basement or a converted garage counted in one figure and not the other.
- Different measuring. Listing agents and the assessor often measure the same house differently.
AddressIntel AI Briefing
The property offers a solid baseline with its spacious layout on a massive lot, though the newer build age limits immediate teardown appeal. The optimal play here is stealth density (primary + ADU + JADU) to maximize the deep lot while preserving the highly-valued main structure. Liquefaction zones in the area serve as a development blocker, necessitating specialized structural engineering for new foundations.
Property Permit History
| Date | Project Type | Status | Valuation | Contractor |
|---|---|---|---|---|
| 2026-10-09 | SEWER VIDEO REVIEW FOR PROPERT... | Issued | -- | Unknown |
Recent Neighborhood Remodeling (Hillsborough)
Parcel & Zoning Info
ADU Potential
Flag / irregular · ~250 ft frontage × 269 ft deep, a tucked-away rear unit is very private; access is typically via the pole driveway.
Screening heuristic based on lot size, existing coverage, lot orientation, and hazard overlays. CA ADU law is ministerial statewide; verify max size, setbacks, and JADU owner-occupancy with the local planning dept.
Redevelopment Potential
Existing home already uses most of the allowable floor area, little expansion headroom. Zoning allows roughly 5,858 sqft of gross floor area on this lot.
Screening estimate comparing existing living area to the city's single-family floor-area limit. FAR figure is a discretionary-review trigger, not a hard cap. Treat as approximate. Source: Town of Hillsborough Development Standards (rev. July 2026), Minimum and Maximum House Size; Muni Code Title 17 (as of 2026-09-03). Verify FAR, coverage, setbacks, and height with the local planning dept.
Hazard Snapshot
Flood Zone
Fire Severity
Liquefaction
Fault Zone
Not a substitute for a Natural Hazard Disclosure (NHD) report. Zones reflect available GIS data and may not cover all localities. Liquefaction and fault flags: modified from California Geological Survey, Web Service of Official Maps of Alquist-Priolo Earthquake Fault Zones and Web Service of Official Maps of Seismic Hazard Zones (2025).
Nearby Public Schools
South Hillsborough
Hillsborough City Elementary
Crocker Middle
Hillsborough City Elementary
Aragon High
San Mateo Union High
School boundaries are subject to change. Nearest school distance does not guarantee enrollment eligibility. Check with the local district. Data provided by CDE.
Proprietary Intelligence
Market Heat Index
100/100
Based on recent sales velocity and local demand in 94010.
Flippability Score
60/100
Measures neighborhood renovation density vs. recent permits on this property.
Bidding War Prob.
51%
Likelihood of multiple offers based on local list-to-sale ratios and DOM.
Proforma ROI Calculator
Back-of-the-napkin deal analysis across development strategies.
Zoning allows roughly 5,858 sqft on this lot, and the default builds to that envelope. The FAR figure is a discretionary-review trigger, not a hard cap.
Median of 12 recent single-family sales in Hillsborough (94010): $1,429/sqft, plus 5% because new houses sold at a median 1.07x their comps across 239 real rebuilds. Sized within 25% of the 5,900 sqft build, because smaller houses sell for more per foot and pricing a rebuild off them overstates resale.
Commission, transfer tax and closing. Deducted from resale before profit, so the ROI below is net of the exit rather than gross.
Interest on the purchase price for the whole project plus half the build budget, since construction draws ramp up. The default is 7% over 33 months, the median purchase-to-sale time of 239 real Peninsula and South Bay rebuilds. Set the rate to 0 for a cash purchase, or use your own lender's terms.
Projected Profit
Warning: Project is mathematically underwater.
Recent Comparables (Hillsborough 94010)
Sized to the modelled 5,900 sqft build: sales within 25% of it. Smaller houses sell for more per foot, so pricing a rebuild off them overstates resale.