1437 Mason St

Located in the heart of Russian Hill, one of San Francisco's most desirable and supply-constrained residential neighborhoods, 1437 Mason Street presents a rare opportunity to acquire a fully permitted renovation project with significant upside. The property consists of a two-unit residential building originally constructed in 1907, situated on a 2,750 square foot lot in the RM-2 zoning district. The project has already secured approvals and permits through the San Francisco Department of Building Inspection, allowing a buyer to immediately move forward with construction and reposition the asset into a modern, high-end residential property. The approved plans call for a comprehensive redevelopment of the existing structure while maintaining the building envelope. The project includes: Complete interior reconfiguration of both residential units, New structural foundation and seismic improvements, Conversion of basement space into functional living area, Removal and replacement of existing stair systems, Full facade upgrades and exterior improvements, New roof deck elements and modernized architectural features. Upon completion, the project will deliver two redesigned residential units with modern layouts, updated systems, and enhanced outdoor space. Permits in hand for the follow unit mix: One (3) bed (3) bath - UPSTAIRS One (1) bed (1.5) bath - DOWNSTAIRS. Also potential to add 3 units to the front part of the property. Contractor's special

Days on Market

19 days

Current Status

Active

Original Price

$1,388,000

List Price

$1,388,000

On Market Date

Mar 12, 2026

Property Type

Single Family Residence

District

8 - Nob Hill

Zip Code

94133

MLS ID

426111490

APN

0158-005

Year Built

1907

Stories in Building

0

Possession

Close Of Escrow

Data Source

SFAR

Origin MLS System

Bed

0

Bath

2

Parking

2

No Garage, Uncovered Parking Spaces 2+

SQ FT

1,330

SQ FT Source

Unavailable

Lot SQ FT

2,750.0

Lot Acres

0.0631 Acres

Possession

Close Of Escrow

Special Listing Conditions

None

Fee

$0

MLS and other Information regarding properties for sale as shown in Theo have been obtained from various sources such as sellers, public records, agents and other third parties. This information may relate to the condition of the property, permitted or unpermitted uses, zoning, square footage, lot size/acreage or other matters affecting value or desirability. Unless otherwise indicated in writing, neither brokers, agents nor Theo have verified, or will verify, such information. If any such information is important to buyer in determining whether to buy, the price to pay or intended use of the property, buyer is urged to conduct their own investigation with qualified professionals, satisfy themselves with respect to that information, and to rely solely on the results of that investigation.

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