21 Bella Vista
Diablo 94528 · Unincorporated Contra Costa · Coordinates: 37.84109, -121.96003
Parcel & Assessor
- Lot size:
- 48,369 sq ft (1.11 ac)
- Assessor use:
- Single Family, 1 residence on 1 site, with or without
- Tax rate area:
- 66024
- Addresses on lot:
- 21 BELLA VISTA
Zoning & Land Use
R-40 -UE — Single Family Residential · Urban Farm Animal Exclusion Combining District (Unincorporated Contra Costa)
State Housing Pathways Screen (ADU & SB 9)
- ADU or junior ADULikely eligible
Zoned R-40 (single-family residential): state law allows ADUs where homes are allowed.
- SB 9: two homes on the lotLikely eligible
Zoned R-40, a single-family residential zone.
- SB 9: split into two lotsLikely eligible
Zoned R-40, a single-family residential zone. The lot is 48,369 sq ft by the assessor, room for two lots of at least 1,200 sq ft, each at least 40% of the original.
Mapped Hazard Zones on This Lot
- CAL FIRE Fire Hazard Severity Zone
- High Fire Hazard Severity Zone (Local Responsibility Area) (about 88% of the lot, map Mar 24, 2025); Moderate Fire Hazard Severity Zone (Local Responsibility Area) (about 12% of the lot, map Mar 24, 2025)
- FEMA National Flood Hazard Layer
- Zone X: minimal flood hazard (all of the lot) · FIRM panel 06013C0455G, effective March 21, 2017
- CGS Alquist-Priolo Earthquake Fault Zone
- Not in an Alquist-Priolo Earthquake Fault Zone
Surrounding Rent & Value Benchmarks (Public Records)
Range: $2,943,000 – $3,981,000 · Status: Off market
HUD Small Area FMR (ZIP 94528) · FY 2026
Studio $2,140 · 1BR $2,440 · 2BR $2,970 · 3BR $3,830 · 4BR $4,530
Nearby Activity (½ mile radius, since —)
5 active or recent development projects (5 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 3.9 yr (first record Dec 14, 2022) with no new permit activity recorded in 3.9 yr.
- New home (Issued)0.1 mi E
Active in "Issued" for 2.2 yr (first record Aug 1, 2024) with no new permit activity recorded in 2.2 yr.
- New home (Entitled)0.1 mi E
Active in "Entitled" for 3.3 yr (first record Jul 24, 2023) with no new permit activity recorded in 3.3 yr.
- New home (Issued)0.12 mi NW
Active in "Issued" for 4.1 yr (first record Oct 6, 2022) with no new permit activity recorded in 4.1 yr.
Permit & Project History on This Parcel (0 permits, 1 grouped projects)
No building permits recorded on this parcel in our dataset.
State HCD Housing Element APR records on this parcel: 3 entries (report years 2022, 2023, 2024).