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1055 Mason St, San Francisco, California 94108

1055 Mason St

San Francisco, California

1055 Mason St is a multi-family property in the city of San Francisco, California. It is located in the San Francisco County region of the United States, and shares postal code 94108.

This location is a total of 9,918 square feet, has 4 floors, roof access, was built in 1912, and has a floor area ratio of 3.455. The property has 18 residential units, a 2,871 square foot lot area, and is zoned as RM3.

Map
Property Information

Name

1055 Mason St

Property Type

Multi-Family

Year Built

1912

Zoning

RM3

Building Details

Square Footage

9,918 sq ft

Lot Area

2,871 sq ft

Floors

4

Number Of Buildings

1

Floor Area Ratio

3.455

Units & Spaces

Residential Units

18

Infrastructure & Security

Roof Access

Yes

Security

No

System Information

Census Tract

6075011200

Updated

1/24/2026

Created

11/14/2025