Tiburon 94920 · APN 039-081-04 · Tiburon
Since October 2024 within ½ mile: 3 permitted, 2 proposed or in review.
5 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.
24 permits within ½ mile since October 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.
$3,793,000
Benchmark range: $3,224,000 – $4,362,000
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: permits located by parcel, ½ mile radius · Retrieved Oct 31, 2026
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 Tiburon, 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 Tiburon's planning department before relying on it.
Sources: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) (retrieved Oct 31, 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 RO-1 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.
In "Applied" for 5.4 yr (since Jun 23, 2021), with no new permit record in 5.4 yr. · 1 unit · $3,800,000 declared valuation
Permit issued and active for 4.4 yr (first record Jun 2, 2022), with no completion or new permit record in 4.1 yr. · 1 unit · $40,000 declared valuation
Permit issued and active for 3.7 yr (first record Feb 9, 2023), with no completion or new permit record in 3.7 yr. · 1 unit
Permit issued and active for 4.4 yr (first record Jun 9, 2022), with no completion or new permit record in 3.5 yr. · 1 unit · $105,000 declared valuation
Permit issued and active for 3.1 yr (first record Sep 7, 2023), with no completion or new permit record in 3.1 yr. · 1 unit
Permit issued and active for 2.8 yr (first record Jan 12, 2024), with no completion or new permit record in 2.8 yr. · 1 unit
Latest published Zillow Home Value Index (ZHVI) update
Changed from $3,090,631 in September 2025 to $3,404,730 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
4095 Paradise Dr · 1 unit · $2,100,000 valuation
Records span Nov 10, 2025 to Sep 21, 2026 (2 permits).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3840 Paradise Dr · 1 unit · $100,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3860 Paradise Dr Aka · 1 unit · $1,400,000 valuation
Records span Jan 23, 2024 to Oct 14, 2025 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94920 home-value index checkpoint
Changed from $3,209,701 in September 2024 to $3,090,631 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
1 housing unit completed (ADU21-001)
Reported in 2024 Housing Element Annual Progress Report
ADU · Renter
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: parcel
Annual ZIP 94920 home-value index checkpoint
Changed from $3,258,065 in September 2023 to $3,209,701 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94920 (not a parcel appraisal)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3900 Paradise Dr · $65,000 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
4060 Paradise Dr · $3,000 valuation
Records span Nov 15, 2023 to Jul 9, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
3870 Paradise Dr · 1 unit · $2,100,000 valuation
Records span Mar 22, 2023 to Mar 5, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
1 unit
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & 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 Tiburon development graph →Active in "Issued" for 3.6 yr (first record Mar 22, 2023) with no new permit activity recorded in 2.7 yr. High-impact scale (1 housing unit, $2,100,000 declared valuation across 1 permit).
Active in "Issued" for 2.8 yr (first record Jan 23, 2024) with no new permit activity recorded in 13 mo. High-impact scale (1 housing unit, $1,400,000 declared valuation across 1 permit).
Active in "Applied" for 5.4 yr (first record Jun 23, 2021) with no new permit activity recorded in 5.4 yr. High-impact scale (1 housing unit, $3,800,000 declared valuation across 1 permit).
Active in "Issued" for 2.1 yr (first record Sep 11, 2024) with no new permit activity recorded in 2.1 yr.
Active in "Issued" for 3.7 yr (first record Feb 9, 2023) with no new permit activity recorded in 3.7 yr.
Active in "Issued" for 4.4 yr (first record Jun 9, 2022) with no new permit activity recorded in 3.5 yr.
HUD Small Area Fair Market Rent · ZIP 94920
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 ($37,950/yr) + local voter-approved bond debt ($5,693/yr) + fixed direct levies/Mello-Roos ($450/yr).
Insurance & hazard context:
−$238,267/yr
Cash needed: $834,900
NOI: -$7,992/yr
P&I: $19,190/mo
For $0/mo net cash flow
At $4,100/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 | $3,772/mo | −$20,327/mo | -29.2% | $32,145/mo | −$20,478/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $4,100/mo | −$19,856/mo | -28.5% | $29,753/mo | −$19,774/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $4,346/mo | −$19,585/mo | -28.1% | $29,062/mo | −$19,239/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.
Finaled / completed1 unitsJan 20, 2022 – Jan 20, 2022
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: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel (APN) · Retrieved Oct 31, 2026 · Received and issued dates come from the County of Marin. The county publishes no final or expired status, so an issued permit stays 'Issued' after the work is done.
| Report year | Project / record | Type | Entitled | Permitted | Completed | Deed-restricted |
|---|---|---|---|---|---|---|
| 2024 | —(ADU21-001) | ADU · Renter | 1 (Jan 20, 2022) | 1 (Apr 4, 2022) | 1 (Oct 28, 2024) | — |
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Oct 26, 2026 · From Tiburon's Housing Element Annual Progress Reports. A project can appear in several report years as it moves from entitlement to permit to completion.
Source: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) · Geography: zoning district polygon at parcel point · Retrieved Oct 31, 2026
1.00 acres
Assessor's classification for assessment purposes. This is not zoning.
18 TANFIELD RD
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Oct 31, 2026
Search by parcel number 039-081-04. Assessed value is not market value.
Search by parcel number 039-081-04 (Marin County Tax Collector)
Permits issued in unincorporated Marin in the past 48 months. Each city keeps its own records.
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.