San Rafael 94903 · Santa Venetia · APN 180-351-04 · Unincorporated Marin
Zoned R1 in Unincorporated Marin with likely ADU & SB 9 infill eligibility and zero mapped flood, fire, or fault hazard overlaps; benchmark value $1,199,000 ($1,055,000–$1,343,000).
Zoned R1 supports ministerial ADU/JADU review plus SB 9 both two-unit development and ministerial urban lot split on a 7,754 sq ft lot. Local precedent is active with 1 ADU permit within ¼ mile over the last 36 months.
Source: Unincorporated Marin zoning · CA Gov. Code 66314 & 65852.21
Public building records show issued construction/renovation work on this parcel (2 total permits, latest Nov 26, 2024).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) (parcel APN)
all of the lot of the parcel intersects Zone X: 0.2% annual chance flood hazard (shaded X). Outside mandatory federal SFHA insurance rules, but check local drainage and finished-floor requirements.
Source: FEMA National Flood Hazard Layer (parcel polygon)
Automated synthesis of indexed municipal, county, state, and federal public records — informational context only, not a formal appraisal, survey, or legal/tax determination.
$1,199,000
Benchmark range: $1,055,000 – $1,343,000
Closest lead: New commercial building at 10 Ave Of The Flags (0.29 mi W, issued). Inspect timeline history before assuming near-term completion.
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · HCD APR (½-mile radius)
Sale triggers reassessment to 1.00% base + ~0.15% voter debt (~$1,187/mo). Confirm exact Mello-Roos / CFD special assessments on the county tax bill.
Source: CA Const. Art. XIIIA (Prop 13) · County Tax Collector
Since November 2024 within ½ mile: 3 permitted; 1 demolition.
4 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.
339 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: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: permits located by parcel, ½ mile radius · Retrieved Nov 14, 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.
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 Marin's planning department before relying on it.
Sources: County of Marin GIS (MarinMap), Zoning (11 cities and unincorporated Marin) (retrieved Nov 14, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the State Responsibility Area (effective 2024-04-01) (retrieved Nov 9, 2026) · CAL FIRE Office of the State Fire Marshal, Fire Hazard Severity Zones in the Local Responsibility Area (map dated 2025-03-24) (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — flood hazard zones (retrieved Nov 9, 2026) · FEMA, National Flood Hazard Layer — FIRM panels (retrieved Nov 9, 2026) · California Geological Survey, Alquist-Priolo Earthquake Fault Zones (retrieved Nov 9, 2026) · Zoning classes: our classification of R1 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 13.2 yr (first record Aug 20, 2013), with no completion or new permit record in 12.6 yr. · 1 unit · $443,685 declared valuation
Permit issued and active for 12.9 yr (first record Dec 23, 2013), with no completion or new permit record in 12.6 yr. · 1 unit · $357,000 declared valuation
Permit issued and active for 11.8 yr (first record Jan 15, 2015), with no completion or new permit record in 11.4 yr. · $20,000 declared valuation
Permit issued and active for 10.6 yr (first record Apr 5, 2016), with no completion or new permit record in 10 yr. · $463,000 declared valuation
Permit issued and active for 11.1 yr (first record Sep 29, 2015), with no completion or new permit record in 9.8 yr. · 1 unit · $30,000 declared valuation
Permit issued and active for 9.5 yr (first record Jun 1, 2017), with no completion or new permit record in 9.2 yr. · $5,500 declared valuation
Nearby electrical / panel (11 Oak Crest Dr): First appeared in published agency feed
Record B48973 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby electrical / panel (24 Oak Crest Dr): First appeared in published agency feed
Record B48972 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby electrical / panel (13 Oak Crest Dr): First appeared in published agency feed
Record B48971 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby windows / doors / siding (50 Meadow Dr): First appeared in published agency feed
Record B49043 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Nearby commercial tenant improvement (220 N San Pedro Rd): First appeared in published agency feed
Record 94602 · Detected between snapshots
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Snapshot diff within ½ mile
Latest published Zillow Home Value Index (ZHVI) update
Changed from $1,200,587 in September 2025 to $1,250,063 in September 2026.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (not a parcel appraisal)
32 Roosevelt Ave · 1 unit · $50,000 valuation
Records span Mar 17, 2026 to Aug 27, 2026 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
15 Vendola Dr (A D U 15 A) · 1 unit · $327,369 valuation
Records span Jul 16, 2025 to Dec 15, 2025 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
15 Roosevelt Ave · 1 unit · $250 valuation
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94903 home-value index checkpoint
Changed from $1,237,445 in September 2024 to $1,200,587 in September 2025.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (not a parcel appraisal)
Solar / battery storage permit application filed (B40343)
Current status: Issued
PV.PERMIT 4455W DC, 11500W AC, (11) MODULES, (1) 13.5KWh ESS · Declared valuation: $15,464 · Contractor: Sunrun Installation Services Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
Solar / battery storage permit issued (B40343)
Recorded status: Issued
PV.PERMIT 4455W DC, 11500W AC, (11) MODULES, (1) 13.5KWh ESS · Declared valuation: $15,464 · Contractor: Sunrun Installation Services Inc
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel
208 Mark Twain Ave · $4,934 valuation
Records span Sep 30, 2024 to Nov 5, 2024 (1 permit).
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) & HCD APR (grouped project within ½ mile)
Annual ZIP 94903 home-value index checkpoint
Changed from $1,210,123 in September 2023 to $1,237,445 in September 2024.
Source: Zillow Home Value Index (ZHVI) · Data provided by Zillow · Geography: ZIP 94903 (not a parcel appraisal)
251 N San Pedro Rd · $400,000 valuation
Records span Jan 22, 2024 to Feb 27, 2024 (1 permit).
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 Unincorporated Marin development graph →Active in "Issued" for 5.6 yr (first record Mar 26, 2021) with no new permit activity recorded in 5.5 yr. High-impact scale ($2,000,000 declared valuation across 1 permit).
Active in "Issued" for 5 yr (first record Dec 1, 2021) with no new permit activity recorded in 4.4 yr. High-impact scale ($18,000,000 declared valuation across 1 permit).
In "Applied" for 4.3 yr (since Jul 13, 2022), exceeding the 253d median and 686d 90th percentile for new single-family home permits in Unincorporated Marin (n=121).
In "Applied" for 3.8 yr (since Jan 23, 2023), exceeding the 55d median and 261d 90th percentile for demolition permits in Unincorporated Marin (n=130).
Active in "Issued" for 9.5 yr (first record Jun 1, 2017) with no new permit activity recorded in 9.2 yr.
Active in "Issued" for 2.1 yr (first record Sep 30, 2024) with no new permit activity recorded in 2 yr.
Substantial improvements (additions, interior remodels, ADUs, commercial TI, and new builds) across 1,651 parcels
−25.0% YoY
City baseline: 16.3 / 1k
14 in trailing 24m
Includes 5 ADUs
| Builder / contractor | Primary specialty | Here / ½ mi | ½ mi valuation | Citywide 24m trend |
|---|---|---|---|---|
| Sunrun Installation Services | Solar / battery storage | 1 on parcel1 in ½ mi | $15,464 | 0 vs 0 prior |
| M2 Landscape Design And Construction | Remodel / interior alteration | 1 on parcel1 in ½ mi | $8,200 | 0 vs 0 prior |
| Owner Builder Recent nearby: 32 Roosevelt Ave (Aug 27, 2026) | Remodel / interior alteration | 36 in ½ mi |
| Permit category | Sample (n) | 25th pct | Median (50th) | 75th pct | 90th pct | Recent 24m median |
|---|---|---|---|---|---|---|
| New single-family home | 121 | 166d | 253d | 456d | 686d | 210d(vs 276d prior) |
| New multifamily / condos / mixed-use | 21 | 272d | 292d | 293d | 313d | 293d(vs 197d prior) |
| Accessory dwelling unit (new or conversion) | 298 | 120d | 204d | 331d | 549d | 214d(vs 181d prior) |
| Addition (adds square footage) |
HUD Small Area Fair Market Rent · ZIP 94903
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 ($12,000/yr) + local voter-approved bond debt ($1,800/yr) + fixed direct levies/Mello-Roos ($450/yr).
Insurance & hazard context:
Model adding a backyard ADU or garage conversion under California's Prop 13 blended new-construction assessment (existing house & land tax base stays intact; only ADU build cost is assessed) and SB 13 impact-fee rules.
−$50,267/yr
Cash needed: $264,000
NOI: $22,547/yr
P&I: $6,068/mo
For $0/mo net cash flow
At $4,175/mo gross 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 | $3,841/mo | −$4,669/mo | -21.2% | $10,358/mo | −$4,612/mo |
| Base (your inputs) | Your entered assumptions, 3.0%/yr rent growth | $4,175/mo | −$4,189/mo | -19.0% | $9,587/mo | −$3,895/mo |
| Optimistic (cap-limited) | +6% starting rent, 3% vacancy, 4.5%/yr rent growth (capped by AB 1482 ceiling of 8.6%/yr) | $4,426/mo | −$3,913/mo | -17.8% | $9,364/mo | −$3,350/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.
PV.PERMIT 4455W DC, 11500W AC, (11) MODULES, (1) 13.5KWh ESS
Retile Bath
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Geography: parcel (APN) · Retrieved Nov 14, 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.
No housing activity reported to the State for this parcel (2018–2025 reports).
Source: California HCD, Housing Element Annual Progress Report — Table A2 · Geography: project (parcel) · Retrieved Nov 9, 2026 · From Unincorporated Marin'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 Nov 14, 2026
0.18 acres
Assessor's classification for assessment purposes. This is not zoning.
161 MARK TWAIN AVE
Source: County of Marin GIS (MarinMap), Parcels · Geography: parcel · Retrieved Nov 14, 2026
Search by parcel number 180-351-04. Assessed value is not market value.
Search by parcel number 180-351-04 (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.
| $34,495,681 |
| 226 vs 240 prior−6% |
| Owner Recent nearby: 15 Roosevelt Ave (Dec 3, 2025) | Remodel / interior alteration | 15 in ½ mi | $4,428,250 | 25 vs 15 prior+67% |
| Pagan Construction Recent nearby: 123 N San Pedro Rd (Sep 19, 2024) | Remodel / interior alteration | 12 in ½ mi | $884,600 | 0 vs 2 prior |
| Imperial Contracting Recent nearby: 164 N San Pedro Rd Bldg A (Nov 5, 2024) | Remodel / interior alteration | 4 in ½ mi | $599,396 | 0 vs 4 prior |
| Matson Construction Management Recent nearby: 164 N San Pedro Rd - E301 (Apr 4, 2022) | Remodel / interior alteration | 4 in ½ mi | $37,500 | 4 vs 0 prior |
| Diego Bros Recent nearby: 110 Waterford Ter (Sep 22, 2014) | New single-family home | 3 in ½ mi | $806,685 | 0 vs 1 prior |
| S And H Construction Recent nearby: 3530 Civic Center Dr (Nov 16, 2016) | New garage / accessory structure | 3 in ½ mi | $498,000 | 0 vs 0 prior |
| Stodoni Construction Recent nearby: 164 N San Pedro Rd H303 (May 18, 2023) | Remodel / interior alteration | 3 in ½ mi | $21,000 | 0 vs 1 prior |
| 316 |
| 103d |
| 160d |
| 249d |
| 440d |
| 159d(vs 166d prior) |
| Remodel / interior alterationOn this parcel | 1,054 | 36d | 83d | 148d | 266d | 112d(vs 77d prior) |
| Commercial tenant improvement | 81 | 99d | 148d | 233d | 443d | 152d(vs 150d prior) |
| Solar / battery storageOn this parcel | 2,977 | 0d | 0d | 0d | 2d | 0d |
Source: County of Marin Community Development Agency, Building Permits (unincorporated Marin) · Computed from issued permits with recorded application and issuance dates over the trailing 60 months. Categories with fewer than 20 permits are excluded.