Add Listing
    For Sale
    • For Sale
    • For Lease
    • Recently Sold
    • Property Lookup
    • Brokers
    Back to Search
    Prime San Francisco Redevelopment Opportunity Title is generated by Realmo AI

    34 Mason Street, San Francisco, CA 94102

    View on Map
    Claim this Listing
    For Sale
    $5,250,000

    Mixed-use building in downtown San Francisco, ideal for redevelopment.

    Type:Commercial
    Property size:
    12,375 SF
    Lot size:
    0.08 Acres
    Price / SF:
    $424/SF
    Added:
    Jan 24, 2026
    Days on Market:
    131
    Last Refresh:
    Apr 5 at 8:19 pm

    Property Features for 34 Mason Street

    General Information

    Standard status
    Active
    Size
    12,375 SF
    Lot size
    0.08 Acres
    Property subtype
    Commercial

    Building Details

    Year Built
    1907

    We can help!

    Listing Contact
    MINDY TSOI

    Listing agent MINDY TSOI

    Listing office INTERO REAL ESTATE SERVICES

    Listing date Jan 24, 2026

    Source Corcoran

    Displayed information is deemed reliable but is not guaranteed and should be independently verified.

    All listing content including descriptions, pricing, images are the copyrighted material of INTERO REAL ESTATE SERVICES

    HighLights

    • Prime downtown San Francisco location near Powell BART, Market Street transit, Union Square, and the Financial District.
    • Flexible C‑3‑G zoning allows for residential conversion, hybrid use, or full redevelopment.
    • Potential for 26 residential units or 18 units plus retail.
    • 12,375 sq. ft. building with three floors.
    • Historic 1907 brick‑facade building with architectural charm.
    • Features expansive windows, open floor plates, and generous ceiling heights suitable for adaptive re‑use.

    Overview

    Located in downtown San Francisco, 34-38 Mason Street is a 12,375 sq. ft. building constructed in 1907. The property features a brick facade and spans three floors. Currently, the ground floor is occupied by a restaurant, the second floor houses an engineering company, and the third floor contains vacant office space. The property is zoned C-3-G (Downtown Commercial General), which permits residential conversion. This opens possibilities for hybrid use, partial office-to-residential transformation, or full residential redevelopment. The location is near Powell BART, Market Street transit lines, Union Square, the financial district, Moscone Center, and retail and hospitality destinations. The building's features include expansive windows, open floor plates, historic brick details, and generous ceiling heights, making it suitable for adaptive re-use and modern living or workspace concepts. The property offers potential for residential conversion to 26 units or hybrid conversion to 18 units plus retail.
    Property Profile Location Intelligence

    Current Use by Public Records

    Conventional restaurants

    Suggested Use

    Real Estate Agency Restaurant Spa & Massage Center Dental Office Hair Salon Nail Salon Building Supply Daycare Center Gym & Fitness Center Kitchen & Bath Showroom

    Zoning and permitted uses should be independently verified with local authorities.

    Location Insight

    • Map
    • Local Demand
    City
    San Francisco
    County
    San Mateo
    State
    California
    Longitude
    -122.409
    Latitude
    37.7833

    Nearby Similar for Sale

    • $875,000
      1,280 SF

      San Francisco Showroom For Sale

      Versatile 1,280 SF showroom in a dynamic San Francisco location.
      637 King Street R1, San Francisco, CA 94107
      View Details
    • $1,200,000
      3,075 SF

      Mixed-Use Property with Retail Apartments

      Ground-floor retail with large storefront windows paired with fully leased upstairs residential units.
      4871 Mission ST, SAN FRANCISCO, CA 94112
      View Details
    • $1,699,000
      2,912 SF

      Duplex with Tandem Garage Potential

      Rare Inner Richmond duplex offering two well-matched units plus a tandem garage and backyard with redevelopment opportunity.
      710-712 9Th Ave, San Francisco, CA 94118
      View Details
    • $1,900,000
      2,536 SF

      Mixed-Use Building with Storefront

      For sale mixed-use property with a street-level storefront and three renovated residential units, delivered vacant for flexible occupancy.
      3774 Mission ST, SAN FRANCISCO, CA 94110
      View Details
    • $850,000
      752 SF

      Potrero Hill Vacant Duplex

      Vacant duplex in coveted Potrero Hill neighborhood.
      2109 22nd St, San Francisco, CA 94107
      View Details
    • $1,798,000
      3,965 SF

      Duplex with Vacant Three-Bed Unit

      Two-unit income property with one occupied 2-bedroom and one vacant 3-bedroom ready for lease-up.
      616-618 Masonic AVE, SAN FRANCISCO, CA 94117
      View Details
    • $2,200,000
      4,457 SF

      NOPA Multifamily Investment Opportunity

      Well-maintained five-unit apartment building in San Francisco's NOPA neighborhood.
      1821-1823 Oak Street, San Francisco, CA 94117
      View Details
    • $3,800,000
      3,353 SF

      Eureka Valley Multi-Family Investment

      Three-unit building in San Francisco's desirable Eureka Valley neighborhood.
      130 Grand View AVE, San Francisco, CA 94114
      View Details
    • $2,995,000
      4,850 SF

      Nob Hill Multifamily Investment Opportunity

      Classic San Francisco apartment building in prime Nob Hill location.
      1520 Leavenworth Street, San Francisco, CA 94109
      View Details
    • $3,750,000
      4,302 SF

      Mixed-Use Property in Mission District

      Well-maintained mixed-use property with retail and residential units in San Francisco.
      3265 22nd Street, San Francisco, CA 94110
      View Details
    • $18,000,000
      3,356 SF

      San Francisco Mixed-Use Trophy Asset

      Rare mixed-use property with income and residential development potential.
      3516-3518 Sacramento Street, San Francisco, CA 94118
      View Details
    • $350,000

      Office Space

      For-sale commercial suite zoned C3 in San Francisco’s Financial District.
      617 7th ST, SAN FRANCISCO, CA 94103
      View Details

    FAQs

    What type of property is this?
    Mixed-use property - Mixed-use building in downtown San Francisco, ideal for redevelopment.
    Where is this mixed-use property located?
    The property is located at 34 Mason Street San Francisco, CA.
    What is the asking price?
    The asking price for this property is $5,250,000.
    What are key features of this property?
    This property features: Prime downtown San Francisco location near Powell BART, Market Street transit, Union Square, and the Financial District.; Flexible C‑3‑G zoning allows for residential conversion, hybrid use, or full redevelopment.; Potential for **26 residential units or 18 units plus retail**.
    (650) 589-1000
    We can help!
    Listing Contact
    MINDY TSOI
    Request Owner's contact information
    Message sent successfully
    Error
    If you are the owner or broker of this property and would like to edit or remove this listing please send a message to web site administrator.
    Message sent successfully
    Error
    Email to Your Friends
    Link copied to clipboard
    Separate multiple addresses with a comma
    Message sent successfully
    Error

    Realmo Value Estimations

    Realmo estimates a property’s market value using a proprietary methodology that incorporates public data and user-submitted information. This cumulative value is generated by integrating a variety of conventional and innovative methods. 

    Disclaimer

    These figures are not official appraisals and should not be used as a substitute for a valuation performed by a licensed appraiser.
    Actual market value may differ due to factors not captured in the data. Estimates are offered for informational purposes only, and users should conduct independent research before making financial or investment decisions.
    By using this feature, you acknowledge that Realmo is not responsible for actions taken based on these estimates.

    AI approach

    Realmo AI Method estimates property value using machine learning models trained on millions of comparable listings, transactions, and market signals. It analyzes property features, location intelligence data, and current market dynamics to predict the most probable market value in real time.

    Realmo CapRate Calculation

    Realmo calculates the Capitalization Rate (Cap Rate) to help estimate a property's potential return on investment. The Cap Rate is a fundamental metric in commercial real estate that measures the relationship between a property's net operating income and its market value.

    How We Calculate Cap Rate

    Cap Rate Formula:
    Cap Rate (%) = (Net Operating Income / Property Value) × 100

    Net Operating Income (NOI) Formula:
    NOI = Area × Lease Rate × (1 - Vacancy Rate) × (1 - Operating Expense Ratio)

    Components

    Net Operating Income (NOI) represents the annual income a property generates after operating expenses:

    • Area: Building square footage from property records
    • Lease Rate: Annual $/sqft based on market data for the property type and geographic location
    • Vacancy Rate: Percentage of unoccupied space based on market data for the property type and location
    • Operating Expense Ratio: Operating costs as a percentage of income, varies by property type

    Property Value is derived from:

    • Recent sale price (if available)
    • Statistical models using comparable sales
    • AI-powered valuation estimates

    Example Calculation

    For a 100,000 sqft Office Building:

    • Lease Rate: $25.00/sqft/year (market data for Office in this area)
    • Vacancy Rate: 8% (market data for Office in this area)
    • Operating Expense Ratio: 35% (typical for Office properties)
    • Property Value: $15,000,000

    Step 1: Calculate NOI

    NOI = 100,000 × $25.00 × (1 - 0.08) × (1 - 0.35)
    NOI = 100,000 × $25.00 × 0.92 × 0.65
    NOI = $1,495,000/year

    Step 2: Calculate Cap Rate

    Cap Rate = ($1,495,000 / $15,000,000) × 100
    Cap Rate = 9.97%

    Property Type Considerations

    Net Operating Income calculations vary by property type due to different operating expense ratios:

    • Office: Higher expenses (30-40%) for HVAC, utilities, maintenance
    • Retail: Moderate expenses (25-35%) for common area maintenance
    • Industrial/Warehouse: Lower expenses (15-25%) for minimal tenant services
    • Multifamily: Moderate expenses (35-45%) including property management
    • Self-Storage: Lower expenses (25-35%) due to minimal maintenance

    Market lease rates and vacancy rates are specific to each property type and geographic location, reflecting local market conditions.

    Disclaimer

    These calculations are estimates for informational purposes only and should not be used as a substitute for professional financial analysis or appraisal.

    • Cap Rate calculations depend on market data that may change over time
    • Actual operating expenses, lease rates, and vacancy rates may differ from market averages
    • Individual property conditions, lease terms, and tenant quality significantly impact actual NOI
    • Property value estimates are approximations and not official appraisals
    • Cap rates vary widely by market, property condition, and investment risk profile

    Professional Guidance Recommended: Before making any investment or financial decisions, consult with licensed appraisers, commercial real estate brokers, and financial advisors who can evaluate your specific property and circumstances.
    By using this feature, you acknowledge that Realmo is not responsible for investment decisions or actions taken based on these estimates.

    Cap approach

    Capitalization Method calculates value based on estimated net operating income (NOI) and applying a market-based capitalization rate (cap rate), we estimate what a typical investor might be willing to pay for it.

    Comparable approach

    Comparable estimate is based on recent sales of similar nearby properties, adjusted for factors like size, condition, and location.

    Relative

    Relative property class coefficient uses factors that account for typical price differences between various asset types (e.g., retail vs. industrial) to provide a more accurate market-aligned estimate.

    Geo

    Comparable Sales Method, enhanced by Geo coefficients — location-based adjustment factors that reflect differences in price levels across neighborhoods, cities, or regions ensuring a more accurate, market-sensitive valuation.

    Stat Estimate

    This method estimates value based on actual market adjusted recent (~5 years) sales of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all similar sales ($/sqft) are above this value
    • Range-to: 75% of all similar sales ($/sqft) are below this value
    AI Estimate

    This method estimates value based on AI market estimation of comparable properties around by location and property type.

    • Ranges - area data calculated by industry standard IQR Outlier Removal Method
    • Range-from: 75% of all estimations ($/sqft) are above this value
    • Range-to: 75% of all estimations ($/sqft) are below this value
    Alternative use

    Estimate considers the property’s potential value if used for a different purpose-based on zoning, demand, and market feasibility.

    More about this property
    Thanks! Your message was sent.
    Error! Your message wasn't sent.
    Please enter your name
    Please enter email
    Please enter the email in the correct format
    Please enter phone
    Please enter the number in the correct format
    Please enter message
    Thank You

    You are Unsubscribed From Notifications

    Thank You for Inquiry
    34 Mason Street, San Francisco, CA 94102
    letter with green check mark
    Check your email
    We sent you the
    agent's contact details. yellow underline
    Can't find it?
    Please check your junk/spam folder.
    Google sign-in failed. Please try again or use another login method.
    Sign Up Successful!
    You now have access to more from Realmo!