El Sobrante 94803 · APN 431-070-031-7 · Unincorporated Contra Costa
Since November 2024 within ½ mile: 4 permitted, 5 proposed or in review.
9 projects with a record in this window, grouped by us from permits and State housing reports. Units are as proposed on each project's latest record and counted at its current stage.
74 permits within ½ mile since November 2024
The map shows new construction, ADUs, demolitions, additions, and renovations. Routine systems work (roofs, HVAC, water heaters) is counted but not mapped. Unit counts are as stated on permits.
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) · Geography: permits located by parcel, ½ mile radius · Retrieved Oct 26, 2026
$764,000
Benchmark range: $649,000 – $879,000
Public-records benchmark estimate combining Zillow Home Value Index (Data provided by Zillow), Census ACS 5-year estimates, parcel land-use/lot characteristics, and issued building permits. Not an official appraisal.
We don't have building permits for Unincorporated Contra Costa, so we can't show what has been permitted nearby.
Permit counts, by the date issued (or applied, if not yet issued). Lot splits are planning cases, which we don't have.
We read public zoning and hazard maps against state law (ADUs: Gov. Code 66314; SB 9: Gov. Code 65852.21 and 66411.7). Local rules, title, tenancy history and site conditions can change the answer. Check with Unincorporated Contra Costa's planning department before relying on it.
Sources: Contra Costa County Department of Conservation and Development, Zoning (unincorporated Contra Costa) (retrieved Oct 26, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the State Responsibility Area (effective 2024-04-01) (retrieved Oct 26, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the Local Responsibility Area (map dated 2025-03-24) (retrieved Oct 26, 2026) · FEMA, National Flood Hazard Layer — flood hazard zones (retrieved Oct 26, 2026) · FEMA, National Flood Hazard Layer — FIRM panels (retrieved Oct 26, 2026) · California Geological Survey, Alquist-Priolo Earthquake Fault Zones (retrieved Oct 26, 2026) · Zoning classes: our classification of R-7 as single-family residential, checked against the zone description on Oct 24, 2026
Chronological history of building permit applications and issuances, snapshot-dated status changes, State housing entitlements, surrounding development within ½ mile, and area home-value trends.
Permit issued and active for 13.1 yr (first record Oct 2, 2013), with no completion or new permit record in 13.1 yr. · $5,000 declared valuation
Permit issued and active for 8.6 yr (first record Apr 9, 2018), with no completion or new permit record in 8.5 yr. · 1 unit · $50,000 declared valuation
In "Entitled" for 7.8 yr (since Jan 8, 2019), with no new permit record in 7.8 yr. · 1 unit
In "Entitled" for 7.4 yr (since Jun 24, 2019), with no new permit record in 7.4 yr. · 1 unit · $50,000 declared valuation
Permit issued and active for 7.1 yr (first record Sep 17, 2019), with no completion or new permit record in 7.1 yr. · 1 unit
In "Entitled" for 6.3 yr (since Jul 15, 2020), with no new permit record in 6.3 yr. · 1 unit
Latest published Zillow Home Value Index (ZHVI) update
Changed from $727,674 in September 2025 to $726,110 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94803 (not a parcel appraisal)
1 unit
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
Annual ZIP 94803 home-value index checkpoint
Changed from $790,997 in September 2024 to $727,674 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94803 (not a parcel appraisal)
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
Building permit reported to State HCD for 1 housing unit (BIR25-002620; CDSU24-00137)
Reported in 2025 Housing Element Annual Progress Report
ADU · Renter
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: parcel
1 unit
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
28 Martins Ln Unit 2 · 1 unit · $53,400 valuation
Records span Jul 15, 2024 to Mar 26, 2025 (2 permits).
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
3085 Sun Ct Unit 2 · 1 unit · $48,000 valuation
Records span Dec 10, 2024 to Mar 3, 2025 (2 permits).
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
3085 Sun Ct · 1 unit · $48,000 valuation
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
4674 Valley View Rd Unit A · 1 unit · $98,500 valuation
Records span May 9, 2024 to Feb 10, 2025 (2 permits).
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
Planning entitlement approved for 1 housing unit (BIR25-002620; CDSU24-00137)
Reported in 2025 Housing Element Annual Progress Report
ADU · Renter
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: parcel
4503 Whitecliff Way Unit 2 · 1 unit · $63,000 valuation
Records span Jul 15, 2024 to Jan 13, 2025 (2 permits).
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
1 unit
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
Annual ZIP 94803 home-value index checkpoint
Changed from $775,801 in September 2023 to $790,997 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94803 (not a parcel appraisal)
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) & HCD APR (grouped project within ½ mile)
Cross-referenced intelligence from our historical development graph—connecting parcels, permits, entity-resolved builders, empirical review-time distributions, and neighborhood renovation trends.
Explore full Unincorporated Contra Costa development graph →Active in "Issued" for 21 mo (first record Jan 30, 2025) with no new permit activity recorded in 21 mo.
Active in "Entitled" for 3.9 yr (first record Nov 28, 2022) with no new permit activity recorded in 3.9 yr.
Active in "Entitled" for 6.3 yr (first record Jul 22, 2020) with no new permit activity recorded in 6.3 yr.
Active in "In review" for 4.8 yr (first record Jan 4, 2022) with no new permit activity recorded in 3.9 yr.
Active in "Entitled" for 7.8 yr (first record Jan 8, 2019) with no new permit activity recorded in 7.8 yr.
Active in "Applied" for 4.1 yr (first record Oct 18, 2022) with no new permit activity recorded in 4.1 yr.
HUD Small Area Fair Market Rent · ZIP 94803
HUD FY 2026 · 40th-percentile gross rentCensus ACS 5-year median gross rent (all bedroom counts combined):
Area home-value benchmarks (not an appraisal)
ZIP & neighborhood mediansUnder California Proposition 13, the seller's historical assessed value does not carry over to a buyer. On sale, the parcel is reassessed at the purchase price: 1.00% base rate ($7,650/yr) + local voter-approved bond debt ($1,377/yr) + fixed direct levies/Mello-Roos ($450/yr).
Mapped hazard zone insurance context on this parcel:
−$33,654/yr
Cash needed: $168,300
NOI: $12,765/yr
P&I: $3,868/mo
For $0/mo net cash flow
At $2,750/mo rent
| Scenario | Assumptions | Year 1 Rent | Year 1 Cash Flow | Cash-on-Cash | Break-Even Rent | Year 5 Cash Flow |
|---|---|---|---|---|---|---|
| Conservative | −8% starting rent, +3% vacancy, +3% combined maintenance/CapEx, 1.5%/yr rent growth | $2,530/mo | −$3,121/mo | -22.2% | $6,886/mo | −$3,100/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $2,750/mo | −$2,805/mo | -20.0% | $6,373/mo | −$2,628/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $2,915/mo | −$2,623/mo | -18.7% | $6,225/mo | −$2,269/mo |
Rental regulatory context (informational only — not legal advice):
California AB 1482 (Tenant Protection Act, Civ. Code § 1947.12) caps annual rent increases at 5% + local CPI (max 10%) on covered properties.
Issued1 unitsJan 30, 2025 – Jan 30, 2025
We group related permits and State housing reports into projects. That grouping is our inference, not an official record.
No building permits are recorded for this parcel since 2016.
Source: City of Richmond Planning & Building, PermitTrak (eTRAKiT permits, 1992 to April 2025) · Geography: parcel (APN) · Retrieved Oct 26, 2026 · Richmond's permits come from its eTRAKiT system, retired in 2025. Statuses are as of April 2025, and later permits are not published.
| Report year | Project / record | Type | Entitled | Permitted | Completed | Deed-restricted |
|---|---|---|---|---|---|---|
| 2025 | —(BIR25-002620; CDSU24-00137) | ADU · Renter | 1 (Jan 30, 2025) | 1 (Apr 28, 2025) | — | — |
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Oct 26, 2026 · From Unincorporated Contra Costa's Housing Element Annual Progress Reports. A project can appear in several report years as it moves from entitlement to permit to completion.
Source: Contra Costa County Department of Conservation and Development, Zoning (unincorporated Contra Costa) · Geography: zoning district polygon at parcel point · Retrieved Oct 26, 2026
0.27 acres
Assessor's classification for assessment purposes. This is not zoning.
71 AVENIDA MARTINEZ
Source: Contra Costa County Assessor / Department of Information Technology, Assessment Parcels · Geography: parcel · Retrieved Oct 26, 2026
County map with assessor parcel maps and zoning. Search parcel 431-070-031.
Search by parcel number 431-070-031 (Contra Costa County Treasurer-Tax Collector). Assessed value is not market value.
The official flood hazard map for this location. Our reading of it is under What could be built here.
This site does not show owner names.