3173 21st St, San Francisco, CA, 94110
About This Home
3173-3173A 21st Street is a 4-unit property featuring 3 residential apartments (1) 1-bedroom 1-bath plus den unit, (1) 2-bedroom 1-bath and one (1) spacious 4-bedroom, 2-bath unitalongside an ADAcompliant ground-floor commercial space that is being operated as a hair salon and is leased at $2,799.00 per month on a 3-year lease that was signed in October 2025. There's a shovel-ready 1-bedroom ADU on the ground floor that awaits finishing by a future owner, offering additional income potential once completed. With the existing units brought up to market rents and the ADU finished, there is approximately 60% upside in the current rent roll. With separate individual water meters, new 400 amp electrical service, the property benefits from extremely efficient operating expenses, making this an attractive opportunity for an investor seeking both stable income and growth potential.
Getting Around
Walker's Paradise
Excellent Transit
Biker's ParadiseSchools
Construction
Condition
- Year built: 1900
Materials
- Foundation: Concrete
- Roof: Asphalt,Spanish Tile
Type & Style
- Home type: MultiFamily
- Property subType: Mixed Use
Interior
Appliances
- Laundry features: Common Area
Basement
- Has basement: Yes
- Basement: Other
Bedrooms & Bathrooms
- Bedrooms: 7
Interior Area
- Total structure area: 2,350
- Total interior livable area: 2,350 sqft
Property
Details
- Parcel number: 3615031B
- Special condition: Standard
Lot
- Lot size: 2,113 sqft
- Features: Shape Regular
Climate Risk is Financial Risk
Every home has a financial story beyond the listing price. Below, you’ll see the climate risks that could affect this property — and in Bills & Affordability, how those risks may influence repairs, insurance, utilities, and long-term value.
Biggest Threats for This Home
- Earthquake
- Inland Flooding
How This Home’s Risks Compare
FEMA Declared Disasters in San Francisco County and California
Understanding the Costs
Financial advisors generally recommend spending no more than 30% of your gross household income on housing costs. In practice, many households stretch to 35% or beyond — especially in high-cost markets.
Estimated Costs Today
| Monthly | Annual | |
|---|---|---|
| Mortgage | $8,848 | $106,176 |
| Home Insurance * | $284 | $3,408 |
| Property Taxes | $2,005 | $24,060 |
| Electricity | $503 | $6,047 |
| Total | $11,640 | $139,680 |
Income You'd Need if You Spent...
California FAIR Plan Programs
How Costs Could Change Over Time
Climate risk is quickly impacting all of the major home ownership costs. Adjust the growth rates and percentage of income spent on housing below to see how your housing costs could change over the next 10 years — and what income you'd need to keep up.
Comparing Against the Market
Price Per Sq Ft
vs Other Active Listings
Avg $/sqft
vs Homes Sold Last Month
Median $/sqft
Current Market Trends
Median Price Per Square Foot
The median price per square foot of homes sold in this area each month. Compare this to this listing's price per square foot to gauge whether the home is priced in line with recent sales.
Historicals for This Listing
Zestimate History ($/sqft)
No zestimate history available
Price History
| Date | Event | Price |
|---|---|---|
| 2026-05-14 | Listed for sale | $1,750,000 |
| 2021-02-28 | Listing removed | -- |
| 2019-06-12 | Listing removed | $6,999 |
| 2019-05-12 | Listed for rent | $6,999 |
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