Marin County property record for 15 Upper Alcatraz Pl, Mill Valley, CA 94941
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 3,064 sqft · built 1932 |
| Lot Size | 0.849 acres (37,000 sqft) |
| Owner | 2 Company Names on File |
| Last Sale | $1,600,000 (Dec 2003) |
| Tax Bill | $27,745 (2025) |
| Deeds & Mortgages | Sep 2022 Line of Credit Jun 2018 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 029-053-34 |
| Primary APN | 029-053-34 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Building Area | 3,064 sqft Living Area |
| Basement Area | 1,026 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1932 |
|---|---|
| Effective Year Built | Effective 1965 |
| Lot Area | 37,000 sqft (0.849 acres) |
| Deck Area | 540 sqft |
| Patio Area | 540 sqft |
| Heating System | Central |
|---|
| Street Address | 15 UPPER ALCATRAZ PL |
|---|---|
| City | MILL VALLEY |
| State | CA |
| Zip | 94941-1824 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Subdivision | TAMALPAIS LAND & WATER CO MAP |
| Legal Lot Number | 232 |
| Jurisdiction | MARIN CA |
| Township / Civil Division | SOUTHEAST MARIN |
| Census Block Group | 5 |
| Census Block | 5007 |
| Census Tract | 127000 |
Source: Marin County records · APN 029-053-34
Assessment roll updated July 13, 2026 · Last verified July 2026
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | 2 Company Names on File |
|---|---|
| Mailing Address | 15 UPPER ALCATRAZ PL, MILL VALLEY, CA 94941-1824 |
| Occupancy | Owner Occupied |
| Owner Type | Company |
| Vesting | Trust, Family Trust |
| Date | Document |
|---|---|
| Sep 07, 2022 | Deed of Trust, Mortgage · Line of Credit FIRST REPUBLIC BANK |
| Jun 06, 2018 | Deed of Trust, Mortgage · Conventional Mortgage WELLS FARGO BANK NA |
| Deed Names | 2 Verified Names on Deed |
|---|---|
| Last Sale | Dec 05, 2003 · Amount on Record |
| Deed Sale | Dec 05, 2003 · Amount on Record |
| Deed Document Number | 2003147213 |
| Last Transfer Date | Sep 17, 2015 |
| Transfer Doc | 0000048532 |
| Record Updated | Sep 20, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | MARIN CA |
| Property Address | 15 UPPER ALCATRAZ PL, MILL VALLEY, CA 94941-1824 |
| Transaction Type | Mortgage |
| Record Updated | Sep 28, 2022 |
| Title Company | FIRST AMERICAN TITLE COMPANY |
| Name | Verified Name |
|---|---|
| Address | 15 UPPER ALCATRAZ PL, MILL VALLEY, CA 94941-1824 |
| Document Number | 0000031685 |
|---|---|
| Date | Sep 07, 2022 |
| Instrument | 2022-0031685 |
| Name | FIRST REPUBLIC BANK |
|---|---|
| Type | Bank |
| Address | SAN FRANCISCO, CA 94111 |
| Type | Line of Credit |
|---|---|
| Amount | Amount Recorded |
| Term | 299 Months |
| Due | Aug 26, 2047 |
| Rate Type | Adjustable Rate |
|---|---|
| Change Frequency | Monthly |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | MARIN CA |
| Property Address | 15 UPPER ALCATRAZ PL, MILL VALLEY, CA 94941-1824 |
| Transaction Type | Mortgage |
| Record Updated | Jul 21, 2022 |
| Title Company | OLD REPUBLIC TITLE CO |
| Name | Verified Name |
|---|
| Document Number | 0000020268 |
|---|---|
| Date | Jun 06, 2018 |
| Instrument | 2018-0020268 |
| Name | WELLS FARGO BANK NA |
|---|---|
| Type | Bank |
| Address | SIOUX FALLS, SD 57104 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Jul 01, 2048 |
Source: Marin County records · Assessment roll updated July 13, 2026 · Last verified July 2026
| Type | Name |
|---|---|
| State | California |
| County | Marin County |
| Municipality | Mill Valley City |
| Elementary School District | Mill Valley Elementary School District (KG - 08) |
| Secondary School District | Tamalpais Union High School District (09 - 12) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2026 | $2,320,224 (+2%) Land $1,450,140 Building $870,084 | |
| 2025 | $27,745.00 (+3.47%) Homeowner's exemption | $2,274,736 (+4.04%) Land $1,421,710 Building $853,026 |
| 2023 | $26,814.00 (+2.14%) Homeowner's exemption | $2,186,416 Land $1,366,510 Building $819,906 |
| 2022 | $26,251.00 |
Source: FEMA National Flood Hazard Layer, Marin County (06041C), as of October 18, 2023 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060411270005, as of September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Nearest Special Flood Hazard Area | Zone AE, within 500 ft |
| Flood Insurance Requirement | Not required lenders may require it |
| Flood Insurance Cost | Premium on Record median of 14 policies |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 14 in force |
| Nearby Flood Claims | 11 (1983–2017) |
| Claims Outside the SFHA | 4 of 11 |
| Most Recent Claim | Mar 2017 · river or lake flooding |
| Claims by Event |
|
| Wildfire Risk | Low lower than 80% of the US · lower than 88% of California |
|---|---|
| Wildfire Likelihood | 0.02% annual chance |
| Exposure | Direct burnable vegetation at the parcel |
Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.
Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026
| Provider | Max Down / Up (Mbps) |
|---|---|
| AT&T Fiber · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
May also be available: T-Mobile USA, Unwired.
Based on FCC filings for 595 locations within half a mile of this property.
Source: EPA Safe Drinking Water Information System, water system CA2110002, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | MARIN MUNICIPAL WATER DISTRICT serves 188,116 people |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Aug 2023 |
| Lead | Under 1 ppb (2019–2021) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| Treatment and Procedure | None last 10 years |
| Monitoring and Reporting | None last 3 years |
Results are for the whole water system as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. This system sells water to local utilities; the supplier billing this address may be one of them. The full violation and enforcement history is in the system's EPA record.
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