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Property profile & analytics
OFF-MARKET
Estimated value
$1,055,000
Apartment buildings
1102 Mason St 1120 San Francisco, CA 94108-1512
Entity Owned
1-yr Hold
Free & Clear
Property ID
US09-5747830
Property profile
Verified
Property type
Apartment buildings
Use group
APARTMENT HOUSE (5+ UNITS)
Year built
1909
Construction
WOOD
Total area
5,344 SF
Lot
0.05 ac (2,108 SF)
Zoning code
RM3
APN
0212 -020A
UPID
US09-5747830
Cap rate & NOI
Priority signal for investors
Implied cap rate, NOI & suggested price
Cap rate vs submarket · NOI estimate · 3 price anchors
Implied cap rate, NOI & suggested price
Cap vs submarket · NOI estimate · 3 price anchors
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
by Request
Comparable Approach
Comparable
$914k
Blend (final)
Blend
$1.06M
Owner & transaction history
Clay Mason LLC · 1 yrs held
Clay Mason LLC
since 2025
Last sale
$1.1M
4 recorded transactions
Zoning & alternative use
RM3 · San Francisco, CA
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Industrial (general)
$1.7M
+2.0%
Cap rate
Implied · in-place · derived from last sale + estimated NOI
Implied Cap rate
#1
Implied · in-place · NOI ÷ last sale
In-place · derived from last sale + estimated NOI
Cap rate, NOI & submarket benchmark
Implied cap rate vs San Francisco submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs San Francisco submarket · NOI estimate · typical band, median & reading
Refine your cap rate
8-question underwriting flow
1.
Property current status — Going-In vs Stabilized
2.
Price for denominator — asking / offer / market
3.
Leasing status & lease structure (NNN / Gross)
4.
Tenant risk profile & vacancy assumption
5.
Upload T12 / rent roll / OM (optional)
Refine in 60 seconds, get exact suggested price
T12 upload · Submarket benchmarks · Sensitivity grid
Suggested price · 3 cap rate anchors
Income approach @ 5% / 7% / 9% — aggressive / typical / conservative
Suggested price at 5% / 7% / 9% cap
Aggressive / typical / conservative · Implied $/SF per anchor · Sensitivity grid
Suggested price at 5% / 7% / 9% cap
Aggressive / typical / conservative · implied $/SF · sensitivity
Value
AI, CAP & Alternative Use estimations · Realmo proprietary blendValue Estimations
Based on Realmo’s proprietary methodology
AI Approach
Method
Estimation
Statistic approach
by Request
ML approach
by Request
CAP Approach
CAP Return
Estimation
6%
by Request
6.5%
by Request
7%
by Request
Alternative Use
Use
Estimation
APARTMENT HOUSE (5+ UNITS)
$1,620,000
Current use
INDUSTRIAL (GENERAL)
$1,650,000
Change: +2% · Conversion: Difficult
COMMERCIAL (GENERAL)
$1,475,000
Change: -9% · Conversion: Moderate
Blend value · Realmo final
$1.06M
Range $950k – $1.16M · ±10% · vs last sale $1.14M (Mar 12 2025)
Last sale anchor
$1.14M
Mar 12 2025
Realmo estimate · informational only.
These numbers are calculated by our models from public records and may not reflect actual market value.
Not an appraisal.
Verify with a licensed appraiser before transacting. Realmo accepts no liability for divergence from real-world outcomes.
View the full estimation — every method, every assumption
Confidence drivers & risk notes · Custom comparable set · Free for first 3 / day
Full estimation methodology
Every method · every assumption · confidence drivers
Price per SF
Sale + rent benchmarks
Subject property
$197 / SF
Submarket sale & rent benchmarks
Median sale $/SF · Asking & closed rent · Submarket vacancy
Submarket sale & rent benchmarks
Median sale $/SF · asking & closed rent · submarket vacancy
Property tax & assessments
Tax year 2024Property tax & assessments
Tax year 2024
Tax billed
$5,684
Tax year 2024
Assessed value
$429,871
Assessed 2024
Previous assessed
$429,871
+0.0% YoY
Effective rate
1.32%
On assessed value
Assessed land
$235,092
Assessed improvement
$194,779
Applied tax rate
1.0000
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
Similar Nearby for Lease
Recent comparable sales
Sale price & price/SF · Sale date & distance · Adjustments & confidence
Recent comparable sales
Sale price & $/SF · sale date & distance · adjustments
Property description
Physical attributes from public recordsBuilding & lot
Public records
Property type
Apartment buildings
Use group
APARTMENT HOUSE (5+ UNITS)
Status
Off-Market
Year built
1909
Construction
WOOD
Heating
NONE
Stories
2
Units
5
Rooms
21
Bathrooms
5
Total area
5,344 SF
Lot
0.05 ac (2,108 SF)
Zoning code
RM3
APN
0212 -020A
UPID
US09-5747830
Jurisdiction
SAN FRANCISCO
Metro division
SAN FRANCISCO-SAN MATEO-REDWOOD CITY, CA METROPOLITAN DIVISION
Zoning & alternative use
RM3 · San Francisco, CA
Zoning RM3 · permitted uses
RM3 · San Francisco, CA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
San Francisco. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
APARTMENT HOUSE (5+ UNITS) Current
Est. value
$1.6M
INDUSTRIAL (GENERAL)
Est. value
$1.7M
COMMERCIAL (GENERAL)
Est. value
$1.5M
APARTMENT HOUSE (5+ UNITS) Current
INDUSTRIAL (GENERAL)
COMMERCIAL (GENERAL)
Alternative use deep dive — conversion cost, permits, timeline
Conversion cost estimate · Permit path & risks · Stabilized NOI per option
Alternative use deep dive
Conversion cost · permit path · stabilized NOI per option
Building & site characteristics
From public records
Year built
1909
Construction
WOOD
Heating
NONE
Stories
2
Units
5
Rooms
21
Bathrooms
5
Lot
0.05 ac
Current owner
From public records · entity-resolved
Clay Mason LLC
Entity
Free & Clear · 1 yrs held
Mailing address
1116 MASON ST, SAN FRANCISCO, CA 94108-1512
Mailing matches property
Yes
Owner-occupied
Yes
Ownership since
2025
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
4 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Jun 12, 2025
$1,144,000
Clay Mason LLC
Irene Poon Andersen
Grant Deed
—
Mar 29, 2023
—
Daniel Poon
Daniel Poon
Intrafamily Transfer
related
—
Apr 15, 2011
—
Irene P Andersen
Poon,lester S & Yin H
Affidavit Of Death
related
—
Oct 15, 1992
—
Lester Poon
Sum,p./shee P.
Grant Deed
related
—
Coming soon
Costs & Benchmarks
Operating expenses, capex projections, utility benchmarks, and submarket comparables — all in one view.
Coming soon
Risks
Flood, climate, environmental, title, and tenant-concentration risk — surfaced with mitigations and source citations.
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