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Property profile & analytics
OFF-MARKET
Estimated value
$1,315,000
Office buildings
4100 Duff Pl, Seaford, NY 11783-1324
Entity Owned
22-yr Hold
~
Est. High Equity
Property ID
US63-0243181
Property profile
Verified
Property type
Office buildings
Use group
PROFESSIONAL BUILDING (MULTI-STORY)
Year built
1977
Construction
MASONRY/CONCRETE MASONRY UNITS (CMUS)
Total area
3,232 SF
Lot
0.39 ac (17,206 SF)
APN
52-00A-00-0043
UPID
US63-0243181
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
-
Clifford Greco DDS PC Dental Office
-
American Urological Association Employment Agency Advocacy Group
-
Evan R. Eisenberg, MD. FACS Physician Medical Clinic
-
Reisfeld Peter MD Physician Medical Clinic
-
Dr. Robert H. Mashioff, MD Physician Medical Clinic
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
by Request
Comparable Approach
Comparable
by Request
Blend (final)
Blend
$1.32M
Owner & transaction history
Duff Place Realty LLC
Duff Place Realty LLC
1 recorded transaction
Zoning & alternative use
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 Seaford submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Seaford 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
AUTO REPAIR, GARAGE
$2,125,000
Change: -7% · Conversion: Difficult
COMMERCIAL (GENERAL)
$2,095,000
Change: -8% · Conversion: Easy
RETAIL STORES
$1,840,000
Change: -19% · Conversion: Moderate
Blend value · Realmo final
$1.32M
Range $1.18M – $1.45M · ±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
$407 / 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 2023Property tax & assessments
Tax year 2023
Tax billed
$70,366
Tax year 2023
Assessed value
$9,541
Assessed 2023
Previous assessed
$9,541
+0.0% YoY
Effective rate
737.51%
On assessed value
Assessed land
$3,410
Assessed improvement
$6,131
Total market value
$954,100
Applied tax rate
615.0000
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
PROFESSIONAL BUILDING (MULTI-STORY)
Status
Off-Market
Year built
1977
Construction
MASONRY/CONCRETE MASONRY UNITS (CMUS)
Heating
FORCED AIR
Cooling
CENTRAL
Stories
1
Total area
3,232 SF
Lot
0.39 ac (17,206 SF)
APN
52-00A-00-0043
UPID
US63-0243181
Jurisdiction
NASSAU
Metro division
NASSAU-SUFFOLK, NY METROPOLITAN DIVISION
Zoning & alternative use
Zoning · permitted uses
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Alternative use value scenarios
Repositioning upside vs current use
AUTO REPAIR, GARAGE
Est. value
$2.1M
COMMERCIAL (GENERAL)
Est. value
$2.1M
RETAIL STORES
Est. value
$1.8M
AUTO REPAIR, GARAGE
COMMERCIAL (GENERAL)
RETAIL STORES
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
1977
Construction
MASONRY/CONCRETE MASONRY UNITS (CMUS)
Heating
FORCED AIR
Cooling
Yes
Stories
1
Lot
0.39 ac
Current owner
From public records · entity-resolved
Duff Place Realty LLC
Entity
Mailing address
4100 DUFF PL, SEAFORD, NY 11783-1324
Mailing matches property
Yes
Owner-occupied
Yes
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
1 recorded event · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
—
—
Duff Place Realty LLC
—
Deed Of Trust
related
$543,938 · Jp Morgan Chase Bk
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.
Try Rey
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