203 Mayhew Way
Walnut Creek 94597 · Unincorporated Contra Costa · Coordinates: 37.93725, -122.05253
Parcel & Assessor
- Lot size:
- 10,890 sq ft (0.25 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 79265
- Addresses on lot:
- 203 MAYHEW WAY
Zoning & Land Use
M-17 — Multiple Family Residential (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned M-17 (multifamily residential): state law allows ADUs where homes are allowed. On a multifamily lot the state allowance is different: ADUs in non-living space of the building, plus up to eight detached ADUs.
- SB 9: two homes on the lotUnlikely
Zoned M-17 (multifamily residential), not a single-family residential zone.
- SB 9: split into two lotsUnlikely
Zoned M-17 (multifamily residential), not a single-family residential zone.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- Not in a State-mapped fire hazard severity zone
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06013C0291F, effective June 16, 2009
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $866,000 – $1,172,000 · Status: Off market
HUD Small Area FMR (ZIP 94597) · FY 2026
Studio $2,390 · 1BR $2,660 · 2BR $3,250 · 3BR $4,160 · 4BR $4,930
Nearby Activity (½ mile radius, since —)
6 active or recent development projects (154 housing units across completed, permitted, and pipeline stages) and 0 total building permits recorded within ½ mile.
Developments Deserving Closer Investigation & Active Area Builders
- New home (Entitled)On this parcel
Active in "Entitled" for 23 mo (first record Dec 6, 2024) with no new permit activity recorded in 23 mo.
- New home (Issued)On this parcel
Active in "Issued" for 23 mo (first record Dec 6, 2024) with no new permit activity recorded in 23 mo.
- 149 new homes (Entitled)0.17 mi W
Active in "Entitled" for 22 mo (first record Jan 16, 2025) with no new permit activity recorded in 22 mo. High-impact scale (149 housing units across 0 permits).
- Habitat for Humanity Townhomes (Entitled)0.5 mi S
Active in "Entitled" for 8.4 yr (first record Jun 20, 2018) with no new permit activity recorded in 8.4 yr. High-impact scale (42 housing units, 42 deed-restricted affordable across 0 permits).
Permit & Project History on This Parcel (0 permits, 2 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 2 entries (report years 2024, 2025).