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423 42nd Avenue — San Mateo — 3 Beds • 2 Baths • 1,180 Sq Ft | Belmont Brokerage | Belmont Brokerage

Active

OPEN APR 18 · 1:30PM – 4:30PM

+15 more

$1,698,000

0 DOM

$1,439/sqft3 bd2 ba1,180 sqft

Call

423 42nd Ave San Mateo, CA 94403

5,663sqft lot

Wonderful opportunity to own a bright, sun-filled home in the highly desirable Westwood Knolls neighborhood! It has exceptional potential to move in, renovate, expand, or build new. The existing ~1,180 sq ft single-level home features 3 bedrooms and 2 bathrooms, with main living areas thoughtfully positioned to capture natural light and views. A spacious combined living and dining area creates an inviting setting, complemented by hardwood floors, abundant storage, and updated kitchen. Step outside to a private backyard, perfect for entertaining or relaxing with patio space, lawn area, mature landscaping, and room to create your dream outdoor retreat. Additional highlights include an attached two-car garage with ample storage and workspace. Ideally located just minutes from shopping, dining, parks, and major commute routes, including proximity to Hillsdale Shopping Center, Caltrain, and easy access to Highways 92 and 101. Enjoy a peaceful residential setting while remaining conveniently connected to both San Francisco and Silicon Valley. Don't miss this rare chance to own a view property with incredible upside in one of San Mateo's most sought-after neighborhoods!

MLS ML82043124

(650) 254-6180 (Office) 408-826-2548 (Cell) cathyliu.realtor@gmail.com

Est. payment

$10,850/mo

Principal & interestTaxesInsurance

$8,586$1,769$495

Down %

Rate %

Years

Down payment: $339,600 · Total cost: $3,430,564

Mortgage vs rent

Compare estimated owner carrying cost (same loan math as above) to a gross rent estimate from a price-based multiplier (not a comp lease).

Est. carrying cost$10,850/mo

Principal & interest: $8,586
Est. property tax: $1,769
Est. insurance: $495
Down payment: $339,600

Est. gross rent$7,075/mo

Gross rent ≈ list price ÷ (20 × 12). Adjust the multiplier to match how you underwrite (typical investor GRM bands are often ~16–24 for SFR, market-dependent).

Rent − carrying cost (illustrative)$-3,775/mo

Down payment20%

6.5% APR, 30-year amortization — same P&I formula as the payment calculator above.

Gross rent multiple (annual)20×

Not financial advice. Mortgage uses standard amortizing P&I; taxes and insurance are rough California-style estimates (1.25% / yr tax, 0.35% / yr insurance). Rent is gross (no vacancy or management); actual market rent requires comps or a lease listing.

Price History

Event	Date	Price	Change
Listed	Apr 15, 2026	$1,698,000	—

Facts & Features

Structure & Property

Year Built1953

Garage Spaces2

(650) 254-6180 (Office) 408-826-2548 (Cell) cathyliu.realtor@gmail.com

Sale & Tax History

No Recent Sales History

We didn't find any closed transactions for this property in the last 5 years.

Location

423 42nd Avenue, San Mateo, CA 94403

Get Directions

Call

423 42nd Ave San Mateo, CA 94403

About this home

Cathy Liu

Est. monthly payment

Mortgage vs rent

Price History

Facts & Features

Structure & Property

Cathy Liu

Sale & Tax History

No Recent Sales History

Location

Location

Open Houses

Listing Agent

Presented by Belmont Brokerage Inc.

423 42nd Avenue, San Mateo, CA 94403

About This Property

Property Photos

423 42nd Ave San Mateo, CA 94403

About this home

Cathy Liu

Est. monthly payment

Mortgage vs rent

Price History

Facts & Features

Structure & Property

Cathy Liu

Sale & Tax History

No Recent Sales History

Location

Location

Open Houses

Listing Agent

Presented by Belmont Brokerage Inc.