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Property profile & analytics
OFF-MARKET
Estimated value
$650,000
Apartment buildings
3170 21st St 3180 San Francisco, CA 94110-2519
Trust Owned
18-yr Hold
Absentee Owner
Property ID
US09-5874762
Property profile
Verified
Property type
Apartment buildings
Use group
APARTMENT HOUSE (5+ UNITS)
Year built
1900
Construction
WOOD
Total area
7,358 SF
Lot
0.1 ac (4,400 SF)
Zoning code
NC3
APN
3610 -018
UPID
US09-5874762
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
$447k
Blend (final)
Blend
$650k
Owner & transaction history
Castellucci A & R Trust · 18 yrs held
Castellucci A & R Trust
since 2008
7 recorded transactions
Zoning & alternative use
NC3 · San Francisco, CA
Permitted uses
Permitted uses
Allowed · conditional · prohibited
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
Blend value · Realmo final
$650k
Range $585k – $715k · ±10%
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
$88 / 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
$13,863
Tax year 2024
Assessed value
$928,112
Assessed 2024
Previous assessed
$928,112
+0.0% YoY
Effective rate
1.49%
On assessed value
Assessed land
$553,979
Assessed improvement
$374,133
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
1900
Construction
WOOD
Heating
NONE
Stories
3
Units
7
Rooms
24
Bathrooms
9
Total area
7,358 SF
Lot
0.1 ac (4,400 SF)
Zoning code
NC3
APN
3610 -018
UPID
US09-5874762
Jurisdiction
SAN FRANCISCO
Metro division
SAN FRANCISCO-SAN MATEO-REDWOOD CITY, CA METROPOLITAN DIVISION
Zoning & alternative use
NC3 · San Francisco, CA
Zoning NC3 · permitted uses
NC3 · 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.
Building & site characteristics
From public records
Year built
1900
Construction
WOOD
Heating
NONE
Stories
3
Units
7
Rooms
24
Bathrooms
9
Lot
0.1 ac
Current owner
From public records · entity-resolved
Castellucci A & R Trust
Trust
Mailing address
1757 UN ST, SAN FRANCISCO, CA 94123-4447
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2008
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
9 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Mar 14, 2017
—
Castellucci,antonio & Rita Trust
—
Deed
related
$1,400,000 · First Republic Bk
Jun 17, 2008
—
Castellucci A & R Trust
Castellucci,antonio & Rita
Quit Claim Deed
related
$22,799 · First Republic Bank
Aug 18, 2000
$550,000
Antonio Castellucci
Kreuzberger Trust
Grant Deed
$500,000 · Individual
Aug 2, 2000
—
Kreuzberger Trust
Kreuzberger Trust
Quit Claim Deed
related
—
Apr 19, 1990
$218,500
Robe Kreuzberger
Kreuzberger,r.&l
Quit Claim Deed
related
—
—
—
Antonio Castellucci
—
Deed Of Trust
related
$75,000 · Individual
—
—
Castellucci,antonio & Rita Trust
—
Deed Of Trust
related
$1,400,000 · First Republic Bk
—
—
Antonio Castellucci
—
Deed Of Trust
related
$440,000 · Transnational Fin'l Network
—
—
Antonio Castellucci
—
Deed Of Trust
related
$675,000 · First Republic Bank
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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