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Property profile & analytics
FOR LEASE
Medical Office Space
501-517 Thornhill Dr Carol Stream, IL 60188
Entity Owned
20-yr Hold
Absentee Owner
~
Est. High Equity
Property ID
US28-1480041
For Lease
1 / 50
$1,055,000
501-517 Thornhill Dr, Carol Stream, IL 60188
View Listing →
Property profile
Verified
Property type
Medical Office Space
Use group
MEDICAL BUILDING
Year built
1979
Total area
7,554 SF
Lot
3.46 ac (150,718 SF)
Zoning code
C
APN
05-04-312-001
UPID
US28-1480041
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
-
Aileen Westrick Physician
-
Manuel Calvillo Physician
-
Virginia Dunsmore Physician
-
Melissa Siavelis Physician
-
Laura Tagle Physician
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
by Request
Comparable Approach
Comparable
$710k
Blend (final)
Blend
$1.06M
Owner & transaction history
Thornhill Investments LLC · 20 yrs held
Thornhill Investments LLC
since 2006
7 recorded transactions
Zoning & alternative use
C · Carol Stream, IL
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 Carol Stream submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Carol Stream 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
MEDICAL BUILDING
$1,700,000
Current use
RETAIL STORES
$1,630,000
Change: -4% · Conversion: Difficult
COMMERCIAL (GENERAL)
$1,545,000
Change: -9% · Conversion: Easy
Blend value · Realmo final
$1.06M
Range $950k – $1.16M · ±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
$140 / 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
$18,152
Tax year 2023
Assessed value
$249,970
Assessed 2023
Previous assessed
$236,240
+5.8% YoY
Effective rate
7.26%
On assessed value
Assessed land
$85,590
Assessed improvement
$164,380
Land market value
$256,770
Improvement market value
$493,140
Total market value
$749,910
Applied tax rate
5,030.0000
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
For Lease
Year built
1979
Heating
NONE
Total area
7,554 SF
Lot
3.46 ac (150,718 SF)
Zoning code
C
APN
05-04-312-001
UPID
US28-1480041
Jurisdiction
DU PAGE
Metro division
CHICAGO-NAPERVILLE-JOLIET, IL METROPOLITAN DIVISION
Zoning & alternative use
C · Carol Stream, IL
Zoning C · permitted uses
C · Carol Stream, IL
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Carol Stream. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
MEDICAL BUILDING Current
Est. value
$1.7M
RETAIL STORES
Est. value
$1.6M
COMMERCIAL (GENERAL)
Est. value
$1.5M
MEDICAL BUILDING Current
RETAIL STORES
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
1979
Heating
NONE
Lot
3.46 ac
Current owner
From public records · entity-resolved
Thornhill Investments LLC
Entity
Mailing address
555 S RANDALL RD STE #100, SAINT CHARLES, IL 60174-5918
Mailing matches property
Different — outreach signal
Owner-occupied
No
Ownership since
2006
Owner contacts — direct phone, email, and related entities
Decision-maker phone · Verified email · Related entities & filings
Owner contacts
Email · phone · related entities
Sales History
8 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Jul 29, 2022
—
Thornhill Investments LLC
—
Deed
related
$2,800,000 · Itasca Bank & Trust Co
Jan 18, 2017
—
Thornhill Investments LLC
—
Deed
related
$1,859,694 · Wheaton Bk&tr
Feb 21, 2006
$1,206,000
Thornhill Investments LLC
G Paul Groen
Warranty Deed
$964,800 · Midamerica Bank Fsb
Feb 21, 2006
—
Groen G P
Gmg Holdings Group LLC
Quit Claim Deed
related
—
—
—
Gmg Holdings Group LLC
—
Deed Of Trust
related
$845,000 · First National Bank Chicago
—
—
Gmg Holding Group LLC
—
Deed Of Trust
related
$500,000 · Old Kent Bank
—
—
Thornhill Investments LLC
—
Deed Of Trust
related
$1,859,694 · Wheaton Bk&tr
—
—
Gmg Holdings Group LLC
—
Deed Of Trust
related
$900,000 · Wheaton Bank & Trust Co
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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“Is 15.6% cap rate sustainable?” · “Best tenant mix for BU1?” · “What’s the redev upside?”
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