First time ever on the market in highly desirable Rural Twin Oaks Valley Road in San Marcos. Situated on just under half an acre, this beautifully maintained property offers the perfect blend of country living, energy efficiency, and modern updates. Ideal for a hobby farm or sustainable lifestyle, the fully fenced property features a large garden, animal structure, XL chicken coop, multiple storage buildings, and convenient driveway access to the rear of the lot. There is abundant off-street parking with room for four vehicles on one side of the property and two vehicles on the other, plus plenty of space for RVs, boats, trailers, and recreational toys. Ample room to expand or add additional improvements. The home has been lovingly cared for and thoughtfully upgraded over the years. Standout features include a brand new roof, fully owned solar system with Tesla battery storage, renovated kitchen, updated bathroom, wood flooring throughout, and a spacious mudroom with laundry. Enjoy year-round outdoor living with two covered patios and expansive usable land. A rare opportunity to own a never-before-on-the-market home in Twin Oaks Valley offering privacy, flexibility, and room to grow while still being conveniently close to town. Home came back on the market at no fault to seller.
Single-familyProperty Type
1956Year Built
0.41 acresLot Size
$614Price/Sq.Ft.
6 spacesParking
Listed by Matt Swisshelm•DRE #02029598• Berkshire Hathaway HomeService
Contact: mattswisshelmtc@gmail.com
Bought with Shelly Klessinger•DRE #01355449• Pacific Sotheby's International Realty
Est. $3,293 per month, based on comparable rentals
Sale and tax history for 442 Cassou Rd
Sale History
Tax History
Date
Event
Price
CRMLS #NDP2602002
Apr 9, 2026
Sold
$870,000
$614/sq ft
Apr 1, 2026
Pending
—
Mar 27, 2026
Relisted
—
Mar 12, 2026
Pending
—
Mar 7, 2026
Listed
$850,000
$599/sq ft
Mar 3, 2026
Coming Soon
$850,000
$599/sq ft
Public Records
Oct 6, 2023
Sold
$585,000
$413/sq ft
Public Records
Apr 27, 1970
Sold
$19,500
$14/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$8,113 (+4.5%)
$624,240 + $104,040
$728,280
2024
$7,762 (+1,190.1%)
$612,000 + $102,000
$714,000
2023
$602 (+1.4%)
$600,000 + $100,000
$700,000
2022
$593 (+1.6%)
$12,181 + $39,276
$51,457
2021
$584 (+0.9%)
$11,943 + $38,506
$50,449
2020
$579 (+1.1%)
$11,709 + $37,751
$49,460
2019
$573 (+3.2%)
$11,589 + $37,364
$48,953
2018
$555 (+2.0%)
$11,362 + $36,632
$47,994
2017
$544 (+1.8%)
$10,922 + $35,210
$46,132
2016
$534 (+1.5%)
$10,922 + $35,210
$46,132
2015
$526 (+1.9%)
$10,708 + $34,520
$45,228
2014
$516 (+1.8%)
$10,342 + $33,336
$43,678
2013
$507 (+1.7%)
$10,342 + $33,336
$43,678
2012
$498 (−22.2%)
$10,296 + $33,186
$43,482
2011
$641 (+36.9%)
$10,095 + $32,536
$42,631
2010
$468 (+0.9%)
$9,898 + $31,899
$41,797
2009
$464 (+21.0%)
$9,825 + $31,661
$41,486
2008
$383
$9,849 + $31,737
$41,586
Public record
Public record
Zoning
Beds
3
Baths
1
Stories
1
Lot width
—
Lot depth
—
Lot size
0.46 Acres
Year renovated
1956
Sq. Ft.
1,388
Year built
1956
Style
Single Family Residential
County
San Diego County
APN
1820605100
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Aug 19, 2026.
A70
Limited Agricultural Zone
The A70 Use Regulations are intended to create and preserve areas intended primarily for agricultural crop production. Additionally, a limited number of small farm animals may be kept and agricultural products raised on the premises may be processed.
Typically, the A70 Use Regulations would be applied to areas throughout the County to protect moderate to high quality agricultural land.
Permitted uses
Include but are not limited to:
Agriculture
Housing
Processing
Fire house
Police station
Agriculture-Cropland
Agriculture-Grove / orchard
Park & open space
Property details
Parking
Parking / Garage Information
Uncovered Spaces: 6
Driveway - Concrete
Has Parking
# of Parking Spaces: 6
Interior
Laundry Information
Has Laundry
Individual Room, Gas & Electric Dryer Hookup
Bathroom Information
# of Baths (Full): 1
Cooling Information
Ductless, See Remarks
Has Cooling
Room Information
Art Studio, Workshop, All Bedrooms Down, Kitchen, Living Room
Fireplace Information
Living Room
Has Fireplace
Interior Features
Entry Level: 1
Entry Location: front door
Levels: One
Main Level Bathrooms: 1
Main Level Bedrooms: 3
Exterior
Exterior Features
Pool Features: None
Lot Information
Lot Size Source: Assessor's Data
Lot Features: 0-1 Unit/Acre
Property Information
Common Walls: No Common Walls
Living Area Source: Appraiser
Parcel Number: 1820605100
Total # of Stories: 1
Has View
Year Built Source: Assessor
Utilities
Utilities Information
Sewer: Septic Tank
Location
Multi-Unit Information
# of Units In Community: 10
Neighborhood Information
Community Features: Rural
School Information
High School District: San Marcos Unified
Location Information
Latitude: 33.17959000
Longitude: -117.16509800
Directions: USE GPS
Zoning: Agricultural / Residential
Public facts
Beds: 3
Baths: 1.0
Sq. Ft.: 1,388
Stories: 1.0
Lot Size: 0.46 acres
Style: Single Family Residential
Year Built: 1956
Year Renovated: 1956
County: San Diego County
APN: 1820605100
Home facts updated by county records on Aug 19, 2026
Other
Listing Information
IDX Contact Info: mattswisshelmtc@gmail.com
Days Active in MLS: 8
Continuous Days Active in MLS: 8
Listing Agent Information
List Agent First Name: Matt
List Agent Last Name: Swisshelm
Listing Office Information
List Office Name: Berkshire Hathaway HomeService
Selling Agent Information
Buyer Agent First Name: Shelly
Buyer Agent Last Name: Klessinger
Selling Office Information
Buyer Office Name: Pacific Sotheby's International Realty
Around this home
Schools
Twin Oaks Elementary School
Public K-5 • Assigned • 0.5mi
8/10
Woodland Park Middle School
Public 6-8 • Assigned • 2.9mi
5/10
Mission Hills High School
Public 9-12 • Assigned • 2.7mi
7/10
Provided by GreatSchools
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
5/10 Fire Factor
4% chance of being in a wildfire in next 30 years
5/10 Heat Factor
7 days above 94° expected this year, 23 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
3/10 Air Factor
4 unhealthy days expected this year, 4 days in 30 years
Provided by First Street
Historical weather
San Marcos, CA • 92069
Average low and high temperatures (°F)
69
45
70
48
72
50
71
51
74
56
77
60
80
61
84
63
82
63
77
55
70
48
69
47
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 9.1 hours in
June and 7.3 hours in December, placing it above the
U.S. average for solar exposure.
9.1 hrs
7.3 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$893,000 – $1.08M
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