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Back 321 Grand Boulevard
Off Market

321 Grand Boulevard

San Mateo CA 94401

1852 sq. ft.
7631 sq. ft.
Duplex
Last sold for $1,425,000
Ismael BenhamidaIsmael Benhamida, last sold this property on 02 December 2025 after 69 days on market.

Overview

*Call for offers Thursday 10/16 at 11:00am.*Rare single story triplex consisting of a stand alone cottage and a duplex building on a large 7,631 SqFt lot in one of the Bay Area's most coveted submarkets. Located in close proximity to Downtown Burlingame, Downtown San Mateo, SFO and other landmarks. An ADU consultancy's pre-feasibility study indicates that up to four Accessory Dwelling Units can be added which would drive substantial income and appreciation. Up to 75% LTV conventional financing. Opportunity for future owner-occupancy and a low cost alternative to a single family home. Two one-bedroom/one-bathroom units and one two-bedroom/one-bathroom unit. All three units are large and have private yards and are occupied, providing steady rental income. Tremendous rental income upside upon unit turnover and renovation. There is a three vehicle car-port in the back of the property. Monthly rent: $7,300 (current), $10,000 (proforma). The strong rent growth, shortage of housing units, proximity to large Silicon Valley employers, and ADU potential make 321 Grand Boulevard an exceptional investment for both the cash flow and appreciation-minded investor. The adjacent triplex at 327 Grand Blvd and the fourplex at 315 Grand Blvd are also available for sale.

Features

1852 sq. ft. floor area
7631 sq. ft. lot size
Duplex

Estimated Value

Based on this property and similar duplexes sold in San Mateo over the last 12 months, the estimated median property value of 321 Grand Boulevard is $1.6m.

Median value
$1.6m
Estimated value range
$1.26m - $3.12m
Median days on market
21
Estimated value trend
-12%
decrease over the last 12 months
Average days on market is based on recent, comparable sales in San Mateo. It is only an indication of the time a property is actively listed and should not be relied upon as an accurate representation of how soon a property will be sold.

Property history for 321 Grand Boulevard

2025
Sold
$1,425,000
02 Dec 2025 by Ismael Benhamida, of Compass

Happy sellers in San Mateo

~%

We have insufficient information to provide an overview of customer satisfaction for San Mateo. Viewing the agent profiles, reviews and sales for San Mateo can provide insights for this location.

Local market activity for duplexes in San Mateo

In the last 12 months, 11 duplexes similar to 321 Grand Boulevard, have been sold.

This represents a 34% increase in duplexes sales when compared to the previous 12 months.

Nearby agents

Compare and contact these top performing agents who’ve delivered exception customer service for their clients in San Mateo

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Charles Yoon

Charles Yoon is a recommended agent for San Mateo.  They have 1 local sale and collected 1 local review across the last 12 months.

  •   5   (2 reviews)
  •  1 Review in San Mateo
  •  1 Sale in San Mateo
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Susan Berry

Sellers who recommend Susan Berry have praised them for being local expert, responsive, friendly, clear communication, reliable, supportive, and great negotiation

  •   5   (57 reviews)
  •  1 Review in San Mateo
  •  1 Sale in San Mateo
View profile
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Stella Coral Chen

Stella Coral Chen is a recommended agent for San Mateo.  They have 1 local sale and collected 1 local review across the last 12 months.

  •   5   (8 reviews)
  •  1 Review in San Mateo
  •  1 Sale in San Mateo
View profile
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Gillian Kilroy

Gillian Kilroy is a recommended agent for San Mateo.  They have 4 local sales across the last 12 months.

  •  4 Sales in San Mateo
View profile
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