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Property profile & analytics
OFF-MARKET
Estimated value
$15,350,000
Office Spaces
155 Borthwick Ave 1 Portsmouth, NH 03801-7156
Entity Owned
26-yr Hold
Absentee Owner
Free & Clear
Property ID
US58-0594851
Property profile
Verified
Property type
Office Spaces
Use group
CONDOMINIUM OFFICES
Year built
2005
Construction
STEEL FRAME
Total area
50,496 SF
Zoning code
I
APN
PRSM M:0259 B:0014 L:1A
UPID
US58-0594851
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
-
Access Walk-In Injury Clinic | Portsmouth, NH Medical Clinic
-
Portsmouth Regional Hospital Surgical Oncology Services Physician Hospital
-
Dr. Lucian Szmyd Jr, MD Ophthalmologist
-
DR. RICHARD CHACE Ophthalmologist
-
Dr. Robert McLellan, MD, FACOG Physician Medical Clinic
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
$14.23M
Comparable Approach
Comparable
$19.87M
Blend (final)
Blend
$15.35M
Owner & transaction history
MILLENNIUM BORTHWICK LLC
MILLENNIUM BORTHWICK LLC
Zoning & alternative use
I · Portsmouth, NH
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Commercial (general)
$22.8M
+47.4%
Restaurant
$22.7M
+46.7%
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 Portsmouth submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Portsmouth 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%
$15,410,000
6.5%
$14,225,000
7%
$13,210,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$15,445,000
Current use
COMMERCIAL (GENERAL)
$22,760,000
Change: +47% · Conversion: Easy
RESTAURANT
$22,650,000
Change: +47% · Conversion: Moderate
AUTO REPAIR, GARAGE
$13,305,000
Change: -14% · Conversion: Difficult
Blend value · Realmo final
$15.35M
Range $13.82M – $16.89M · ±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
$304 / 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
$170,859
Tax year 2023
Assessed value
$10,592,600
Assessed 2023
Previous assessed
$10,592,600
+0.0% YoY
Effective rate
1.61%
On assessed value
Assessed improvement
$10,592,600
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 Spaces
Use group
CONDOMINIUM OFFICES
Status
Off-Market
Year built
2005
Construction
STEEL FRAME
Heating
HOT WATER
Cooling
YES
Buildings
1
Stories
3
Units
6
Total area
50,496 SF
Zoning code
I
APN
PRSM M:0259 B:0014 L:1A
UPID
US58-0594851
Jurisdiction
PORTSMOUTH CITY
Metro division
ROCKINGHAM COUNTY-STRAFFORD COUNTY, NH METROPOLITAN DIVISION
Zoning & alternative use
I · Portsmouth, NH
Zoning I · permitted uses
I · Portsmouth, NH
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Portsmouth. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
OFFICE BUILDING Current
Est. value
$15.4M
COMMERCIAL (GENERAL)
Est. value
$22.8M
RESTAURANT
Est. value
$22.7M
AUTO REPAIR, GARAGE
Est. value
$13.3M
OFFICE BUILDING Current
COMMERCIAL (GENERAL)
RESTAURANT
AUTO REPAIR, GARAGE
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
2005
Construction
STEEL FRAME
Heating
HOT WATER
Cooling
Yes
Stories
3
Buildings
1
Units
6
Current owner
From public records · entity-resolved
MILLENNIUM BORTHWICK LLC
Entity
Free & Clear · 0 yrs held
Mailing address
273 CORPORATE DR STE #150, PORTSMOUTH, NH 03801-6864
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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