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Property profile & analytics
OFF-MARKET
Estimated value
$980,000
Medical Office Space
129 Washington St Naperville, IL 60540-4511
Entity Owned
4-yr Hold
Absentee Owner
~
Est. High Equity
Property ID
US28-3317867
Property profile
Verified
Property type
Medical Office Space
Use group
MEDICAL BUILDING
Year built
1997
Total area
3,244 SF
Lot
0.29 ac (12,632 SF)
Zoning code
O
APN
07-13-404-026
UPID
US28-3317867
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
-
Sefcheck Mark M DDS Dental Office
-
Engleman Marcia DDS Dental Office
-
Optimum Orthodontics Dental Office
-
Oral and Facial Surgery of Naperville - Dental Implants Dental Office
-
John Hur DDS, MD Dental Office
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
$935k
CAP Approach
CAP
$685k
Comparable Approach
Comparable
$1.01M
Blend (final)
Blend
$980k
Owner & transaction history
Mdsy LLC · 4 yrs held
Mdsy LLC
since 2022
Last sale
$999,000
3 recorded transactions
Zoning & alternative use
O · Naperville, IL
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Retail stores
$1.3M
+83.5%
Auto repair, garage
$1.2M
+57.1%
Commercial (general)
$750,000
+2.7%
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 Naperville submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Naperville 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
$965,000
ML approach
$935,000
CAP Approach
CAP Return
Estimation
6%
$740,000
6.5%
$685,000
7%
$635,000
Alternative Use
Use
Estimation
MEDICAL BUILDING
$730,000
Current use
RETAIL STORES
$1,340,000
Change: +83% · Conversion: Difficult
AUTO REPAIR, GARAGE
$1,150,000
Change: +57% · Conversion: Difficult
COMMERCIAL (GENERAL)
$750,000
Change: +3% · Conversion: Easy
OFFICE BUILDING
$700,000
Change: -4% · Conversion: Easy
Blend value · Realmo final
$980k
Range $882k – $1.08M · ±10% · vs last sale $999k (Jan 7 2022)
Last sale anchor
$999k
Jan 7 2022
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
$302 / 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
$17,889
Tax year 2023
Assessed value
$275,710
Assessed 2023
Previous assessed
$224,650
+22.7% YoY
Effective rate
6.49%
On assessed value
Assessed land
$170,540
Assessed improvement
$105,170
Land market value
$511,620
Improvement market value
$315,510
Total market value
$827,130
Applied tax rate
7,025.0000
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
Medical Office Space
Use group
MEDICAL BUILDING
Status
Off-Market
Year built
1997
Heating
CENTRAL
Cooling
CENTRAL
Total area
3,244 SF
Lot
0.29 ac (12,632 SF)
Zoning code
O
APN
07-13-404-026
UPID
US28-3317867
Jurisdiction
DU PAGE
Metro division
CHICAGO-NAPERVILLE-JOLIET, IL METROPOLITAN DIVISION
Zoning & alternative use
O · Naperville, IL
Zoning O · permitted uses
O · Naperville, IL
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Naperville. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
MEDICAL BUILDING Current
Est. value
$730,000
RETAIL STORES
Est. value
$1.3M
AUTO REPAIR, GARAGE
Est. value
$1.2M
COMMERCIAL (GENERAL)
Est. value
$750,000
OFFICE BUILDING
Est. value
$700,000
MEDICAL BUILDING Current
RETAIL STORES
AUTO REPAIR, GARAGE
COMMERCIAL (GENERAL)
OFFICE BUILDING
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
1997
Heating
CENTRAL
Cooling
Yes
Lot
0.29 ac
Current owner
From public records · entity-resolved
Mdsy LLC
Entity
Mailing address
536 RIDGEMOOR DR, WILLOWBROOK, IL 60527-5361
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2022
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
3 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Jun 10, 2022
—
Mdsy LLC
—
Deed
related
$2,600,000 · Old National Bank
Jan 7, 2022
$999,000
Mdsy LLC
Mark M Sefeheck
Warranty Deed
$1,598,400 · First Midwest Bank
Aug 19, 2021
—
Mcl Partners LLC
—
Deed
related
$400,000 · The Leaders 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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