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Property profile & analytics
OFF-MARKET
Estimated value
$4,630,000
Office buildings
530th E 1st St, South Boston, MA 02127-1403
Entity Owned
19-yr Hold
Free & Clear
Property ID
US38-0781987
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1970
Construction
FRAME
Total area
9,375 SF
Lot
3.12 ac (135,803 SF)
Zoning code
C
APN
SBOS W:06 P:03403 S:001
UPID
US38-0781987
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
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
$4.54M
Comparable Approach
Comparable
$3.59M
Blend (final)
Blend
$4.63M
Owner & transaction history
Nstar Electric Co · 19 yrs held
Nstar Electric Co
since 2007
1 recorded transaction
Zoning & alternative use
C · South Boston, MA
Permitted uses
Permitted uses
Allowed · conditional · prohibited
Top alternative use upside
Restaurant
$6.3M
+9.5%
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 South Boston submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs South Boston 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%
$4,915,000
6.5%
$4,535,000
7%
$4,210,000
Alternative Use
Use
Estimation
OFFICE BUILDING
$5,760,000
Current use
RESTAURANT
$6,310,000
Change: +9% · Conversion: Moderate
AUTO REPAIR, GARAGE
$5,515,000
Change: -4% · Conversion: Difficult
COMMERCIAL (GENERAL)
$5,270,000
Change: -9% · Conversion: Easy
RETAIL STORES
$5,040,000
Change: -13% · Conversion: Moderate
Blend value · Realmo final
$4.63M
Range $4.17M – $5.09M · ±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
$494 / 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
$89,989
Tax year 2024
Assessed value
$3,561,100
Assessed 2024
Previous assessed
$3,561,100
+0.0% YoY
Effective rate
2.53%
On assessed value
Assessed land
$2,257,800
Assessed improvement
$1,303,300
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
Similar Nearby for Sale
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
Status
Off-Market
Year built
1970
Construction
FRAME
Heating
NONE
Buildings
1
Stories
1
Total area
9,375 SF
Lot
3.12 ac (135,803 SF)
Zoning code
C
APN
SBOS W:06 P:03403 S:001
UPID
US38-0781987
Jurisdiction
BOSTON
Metro division
BOSTON-QUINCY, MA METROPOLITAN DIVISION
Zoning & alternative use
C · South Boston, MA
Zoning C · permitted uses
C · South Boston, MA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
South Boston. Always verify with local authorities before improvements.
Alternative use value scenarios
Repositioning upside vs current use
OFFICE BUILDING Current
Est. value
$5.8M
RESTAURANT
Est. value
$6.3M
AUTO REPAIR, GARAGE
Est. value
$5.5M
COMMERCIAL (GENERAL)
Est. value
$5.3M
RETAIL STORES
Est. value
$5.0M
OFFICE BUILDING Current
RESTAURANT
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
1970
Construction
FRAME
Heating
NONE
Stories
1
Buildings
1
Lot
3.12 ac
Current owner
From public records · entity-resolved
Nstar Electric Co
Entity
Free & Clear · 19 yrs held
Mailing address
PO BOX 270, HARTFORD, CT 06141-0270
Ownership since
2007
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
Jan 17, 2007
$5,500,000
Nstar Electric Co
Banfield Dev Corp
Grant Deed
—
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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