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Property profile & analytics
OFF-MARKET
Estimated value
$565,000
Office buildings
21 Box St Brooklyn, NY 11222-1001
Entity Owned
25-yr Hold
Absentee Owner
Free & Clear
Property ID
US63-3921647
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING (MULTI-STORY)
Year built
1931
Total area
1,520 SF
Lot
0.03 ac (1,520 SF)
Zoning code
M1-2
APN
02478-0014
UPID
US63-3921647
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
Current use
Occupant on record · Public records
-
BioActivate Wellness Program
-
Interstate Greenhouse Company Artist
-
P A Moore Hire Tech Support Center Rental Equipment Company
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
$390k
CAP Approach
CAP
$620k
Comparable Approach
Comparable
$685k
Blend (final)
Blend
$565k
Owner & transaction history
HARRIS ASSOCIATES LLC
HARRIS ASSOCIATES LLC
Zoning & alternative use
M1-2 · Brooklyn, NY
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Warehouse, storage
$840,000
+0.4%
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 Brooklyn submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Brooklyn 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
$390,000
CAP Approach
CAP Return
Estimation
6%
$675,000
6.5%
$620,000
7%
$580,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$835,000
Current use
WAREHOUSE, STORAGE
$840,000
Change: +0% · Conversion: Difficult
Blend value · Realmo final
$565k
Range $509k – $622k · ±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
$372 / 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
$8,465
Tax year 2024
Assessed value
$101,700
Assessed 2024
Previous assessed
$79,200
+28.4% YoY
Effective rate
8.32%
On assessed value
Assessed land
$30,600
Assessed improvement
$71,100
Land market value
$68,000
Improvement market value
$158,000
Total market value
$226,000
Applied tax rate
4.0000
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
Office buildings
Use group
OFFICE BUILDING (MULTI-STORY)
Status
Off-Market
Year built
1931
Heating
NONE
Buildings
1
Stories
1
Units
1
Total area
1,520 SF
Lot
0.03 ac (1,520 SF)
Zoning code
M1-2
APN
02478-0014
UPID
US63-3921647
Jurisdiction
KINGS(BROOKLYN)
Metro division
NEW YORK-WHITE PLAINS-WAYNE, NY-NJ METROPOLITAN DIVISION
Zoning & alternative use
M1-2 · Brooklyn, NY
Zoning M1-2 · permitted uses
M1-2 · Brooklyn, NY
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Brooklyn. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
OFFICE BUILDING Current
Est. value
$835,000
WAREHOUSE, STORAGE
Est. value
$840,000
OFFICE BUILDING Current
WAREHOUSE, STORAGE
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
1931
Heating
NONE
Stories
1
Buildings
1
Units
1
Lot
0.03 ac
Current owner
From public records · entity-resolved
HARRIS ASSOCIATES LLC
Entity
Free & Clear · 0 yrs held
Mailing address
6215 NW 43RD TER, BOCA RATON, FL 33496-4045
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
—
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
No recorded transactions
No recorded transactions found for this property.
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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