$2,999,000
638 Willowgate St, Mountain View 94043
AddressIntel AI Briefing
This massive 18,295 sqft lot represents a premier development site where an SB 9 lot split into multiple units is the optimal play. Liquefaction is present but easily mitigated given the vast site area and massive spread between buy price and completed value. Alternatively, a teardown-and-mansionize approach could deliver an ultra-premium estate.
Property Permit History
| Date | Project Type | Status | Valuation | Contractor |
|---|---|---|---|---|
| 2019-08-29 | ME | Issued | $3,700 | AAA FURNACE AND AIR |
| 2019-08-29 | ME | Issued | $3,700 | AAA FURNACE AND AIR |
Recent Neighborhood Remodeling (Mountain View)
Parcel & Zoning Info
ADU Potential
Flag / irregular · Corner lot · ~193 ft frontage × 291 ft deep, a tucked-away rear unit is very private; access is typically via the pole driveway. A second street frontage lets an ADU take its own entrance and address.
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
Small, older home using a low share of the allowable building envelope on a sizable lot, a scrape-and-rebuild or major-expansion play. Zoning allows roughly 7,318 sqft of gross floor area on this lot.
Screening estimate comparing existing living area to the city's single-family floor-area limit. FAR rule curated from current municipal code. Source: Mountain View Zoning Ord. Ch. 36 (R1 Handbook) (as of 2026-06-30). 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
Edith Landels Elementary
Mountain View Whisman
Isaac Newton Graham Middle
Mountain View Whisman
Los Altos High
Mountain View-Los Altos 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
71/100
Based on recent sales velocity and local demand in 94043.
Flippability Score
85/100
Measures neighborhood renovation density vs. recent permits on this property.
Bidding War Prob.
37%
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 7,318 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 Mountain View (94043): $1,494/sqft. No size-matched sales in Mountain View, so this median mixes build sizes and reads high for a large rebuild.
Commission, transfer tax and closing. Deducted from resale before profit, so the ROI below is net of the exit rather than gross.
Carry on total capital for the project duration. At 0% the model is a cash purchase; 12 months at a typical construction-loan rate moves ROI by 6 to 10 points on a deal this size, so price it with your real rate.
Projected Profit
Recent Comparables (Mountain View 94043)
No size-matched sales in Mountain View, so these are unmatched on size and the ARV below is a loose estimate.