20 Walnut Ave, Mill Valley, CA 94941
OFF MARKET

20 Walnut Ave
Mill Valley, CA 94941

Sycamore/Tamalpais Park
  • 4 Beds
  • 4 Baths
  • 2,500 sqft

$4,814,100

Trulia Estimate
as of Aug 11, 2026
Est. Refi. Payment $29,027/mo*
Refinance Your Home

$4,814,100

Trulia Estimate
as of Aug 11, 2026
Est. Refi. Payment $29,027/mo*
Refinance Your Home
4 Beds
4 Baths
2,500 sqft

Local Information

  • Map ViewExplore the area around 20 Walnut Ave.
  • Schools5 Elementary Schools1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Single-Family Home
Year Built
1909
Living Area
2,500 sqft
Price/Sqft
$1,926
Parking
Garage

About this House

Charming renovated Craftsman style 3 bdrm, 3 bath home with detached 1 bedroom guest house on large level lot in the heart of Sycamore Park. The main level open floor plan features a chef's kitchen & spacious great room that spills out to the covered loggia w/ outdoor fireplace, b-b-q & level lawn. Private main level master suite w/ 2 bdrms & bath on 2nd level. Detached guest house w/ projection screen tv & home gym. Gorgeous level lawn w/ in ground hot tub & putting green.
20 Walnut Ave, Mill Valley, CA 94941 is a 4 bedroom, 4 bathroom, 2,500 sqft single-family home in Sycamore/Tamalpais Park, built in 1909. It last sold for $4,100,000 on Oct 24, 2023. More recently, it was listed as a rental in May 2020 with an asking price of $12,000 per month. That rental listing was removed on May 27, 2020. It is currently off market. The Trulia Estimate is $4,814,100, with a rent estimate of $7,989/month.

Home Details for 20 Walnut Ave

Interior Features

Heating & Cooling
Heating: Wall, OtherHeating Fuel: Wall
Interior Details
Types of Rooms: Dining Room
Fireplace & Spa
Fireplace

Property Information

Year Built
Year Built: 1909Year Updated: 1974
Property Type / Style
Property Type: Single Family HomeArchitecture: Contemporary

Exterior Features

Exterior Home Features
Exterior: Shingle Not Wood
Parking & Garage
GarageParking: Garage Attached

Community

Units in Building: 2

Lot Information

Lot Area: 10500 sqft

Price History for 20 Walnut Ave

DatePriceEventSource
10/24/2023$4,100,000Sold
N/A
05/27/2020$12,000ListingRemovedAgent Provided
05/14/2020$12,000Listed For RentAgent Provided
10/14/2019$11,000ListingRemovedAgent Provided
10/11/2019$11,000Listed For RentAgent Provided
07/27/2019$11,000ListingRemovedAgent Provided
07/03/2019$11,000PriceChange
Agent Provided
04/18/2019$12,500Listed For RentAgent Provided
08/29/2009$2,695,000ListingRemovedAgent Provided
08/07/2009$2,695,000Listed For SaleAgent Provided
04/15/2004$890,000Sold
N/A
08/21/1998$1,364,000Sold
N/A

Market trends in Mill Valley

Last updated June 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
$2.4M
$295KMoM
Sale-to-List Price
108.3%
3.0%MoM
Price per sq ft
$1.08K
$70MoM
Available listings
54
25MoM
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Property Tax and Assessment

Year2025
Tax$51,680
Assessment$4,242,000
Home facts updated by county records

Comparable Sales for 20 Walnut Ave

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
30 Walnut Avenue, Mill Valley, CA
0.03
Single-Family Home
$3,600,000
05/20/26
4
2
1,992
51 Walnut Ave, Mill Valley, CA
0.08
Single-Family Home
$6,300,000
08/15/25
4
4.5
3,206
35 Sycamore Ave, Mill Valley, CA
0.03
Single-Family Home
$5,625,000
02/13/26
4
4
3,716
18 Thalia St, Mill Valley, CA
0.10
Single-Family Home
$3,800,000
03/13/26
3
3
2,635
31 Alvarado Avenue, Mill Valley, CA
0.22
Single-Family Home
$3,855,000
04/28/26
4
3
2,574
10 Avon Ave, Mill Valley, CA
0.35
Single-Family Home
$3,000,000
03/05/26
4
3.5
2,210
54 Mountain View Avenue, Mill Valley, CA
0.16
Single-Family Home
$2,850,000
09/22/25
4
3
2,621
357 - A Molino Avenue, Mill Valley, CA
0.27
Single-Family Home
$2,200,000
06/10/26
4
3.5
2,234
15 E Manor Dr, Mill Valley, CA
0.28
Single-Family Home
$4,450,000
04/23/26
4
4
2,847
357 Molino Ave, Mill Valley, CA
0.24
Single-Family Home
$2,200,000
06/10/26
4
3
2,234

Nearby homes

Get a sense of prices in the area by checking nearby homes.
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Assigned Schools

These are the assigned schools for 20 Walnut Ave.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

Neighborhood Overview

Neighborhood stats provided by third party data sources.

What Locals Say about Sycamore/Tamalpais Park

At least 15 Trulia users voted on each feature.

  • 100 % Say parking is easy

  • 100 % Say it's dog friendly

  • 96 % Say it's walkable to restaurants

  • 95 % Say there's wildlife

  • 95 % Say it's walkable to grocery stores

  • 94 % Say there are sidewalks

  • 88 % Say people would walk alone at night

  • 87 % Say kids play outside

  • 85 % Say car is needed

  • 78 % Say there's holiday spirit

  • 74 % Say yards are well-kept

  • 71 % Say they plan to stay for at least 5 years

  • 71 % Say neighbors are friendly

  • 58 % Say it's quiet

  • 48 % Say there are community events

  • 39 % Say streets are well-lit

Sourced by Trulia users. Learn more about our methodology.
  • G2m74vt2m2
    "Safe streets and the city workers are so good at keeping parks ,streets and the community center spotless. "
    0
    Flag
  • Em J. H.
    "Plenty of dog owners and parks and access to the bike path and dog park and hiking. Ssssssssssssssssss"
    2
    Flag
  • Esherpadotnet t.
    "Love this neighborhood! People are friendly, it's very quiet, very easy access to trails, and a super convenient location for commuting into the city. If only real estate prices would be more reasonable..."
    0
    Flag
  • dan m.
    "Love it here. We moved into the neighborhood a few months ago. Why am I still on Trulia? Doing some market research for work. I would say this is a fantastic family-oriented location. Unfortunately, inventory is super tight. Good luck in your search!"
    0
    Flag

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Apartments for Rent

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Explore by feature - Pet Friendly

25 pet-friendly rentals in Mill Valley, CA

Explore by feature - Garage

25 rentals with a garage in Mill Valley, CA

Explore by feature - Air Conditioning

14 rentals with air conditioning in Mill Valley, CA

Explore by feature - Pool

10 rentals with a pool in Mill Valley, CA

Explore by feature - Washer/dryer

41 rentals with a washer/dryer in Mill Valley, CA

Explore by feature - Outdoor Space

7 rentals with an outdoor space in Mill Valley, CA

Homes for sale near 20 Walnut Ave

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Off Market Homes Near 20 Walnut Ave

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Frequently asked questions about 20 Walnut Ave

  • What is 20 Walnut Ave estimated to be worth?
    Trulia's estimated value for 20 Walnut Ave in Mill Valley, CA is $4,814,100.
  • What is the price history for 20 Walnut Ave?
    20 Walnut Ave in Mill Valley, CA last sold for $4,100,000 in October 2023.
  • Is Mill Valley a buyer's or seller's market?
    Mill Valley is currently a seller's market, based on recent for-sale activity.
  • What's the median sale price in Mill Valley?
    The median sale price in Mill Valley is $2.4M. That is up $295K from the prior month.
  • How big is the lot at 20 Walnut Ave?
    The lot at 20 Walnut Ave in Mill Valley, CA is about 0.24 acres (10,500 sq ft).
  • Does 20 Walnut Ave have a garage?
    Yes, 20 Walnut Ave in Mill Valley, CA has a garage.