New search
Property profile & analytics
OFF-MARKET
Estimated value
$1,905,000
Office buildings
21 B St, Burlington, MA 01803-3485
Entity Owned
20-yr Hold
Free & Clear
Property ID
US38-1045217
Property profile
Verified
Property type
Office buildings
Use group
OFFICE BUILDING
Year built
1960
Construction
STEEL FRAME
Total area
25,401 SF
Lot
1.64 ac (71,438 SF)
Zoning code
IG
APN
BURL M:000033 P:0041-A
UPID
US38-1045217
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
-
EBI Consulting Environmental Program Professional Services
-
CAE Solutions Corporation (Bike/Boat/Book/etc) Store Corporate Office
-
Mullen Co Tax Preparation
Value estimations
Realmo proprietary · 4 methods
AI Approach
AI
by Request
CAP Approach
CAP
by Request
Comparable Approach
Comparable
$1.92M
Blend (final)
Blend
$1.91M
Owner & transaction history
Ast LLC · 20 yrs held
Ast LLC
since 2006
5 recorded transactions
Zoning & alternative use
IG · Burlington, MA
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 Burlington submarket · NOI estimate · Typical band, median & reading
Implied cap rate, NOI & submarket benchmark
Cap vs Burlington 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
Blend value · Realmo final
$1.91M
Range $1.71M – $2.10M · ±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
$75 / 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
$76,240
Tax year 2024
Assessed value
$2,953,900
Assessed 2024
Previous assessed
$2,953,900
+0.0% YoY
Effective rate
2.58%
On assessed value
Assessed land
$978,100
Assessed improvement
$1,975,800
Comparables
6 recent transactions · within 1.5 miComparable in this city
6 recent transactions
Comparable in this City
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
OFFICE BUILDING
Status
Off-Market
Year built
1960
Construction
STEEL FRAME
Heating
CENTRAL
Cooling
YES
Buildings
1
Stories
2
Units
1
Bathrooms
6
Total area
25,401 SF
Lot
1.64 ac (71,438 SF)
Zoning code
IG
APN
BURL M:000033 P:0041-A
UPID
US38-1045217
Jurisdiction
BURLINGTON
Metro division
CAMBRIDGE-NEWTON-FRAMINGHAM, MA METROPOLITAN DIVISION
Zoning & alternative use
IG · Burlington, MA
Zoning IG · permitted uses
IG · Burlington, MA
Permitted & conditional uses
Allowed uses · Special-permit conditions · Prohibited uses
Permitted & conditional uses
Allowed · special-permit conditions · prohibited
Burlington. Always verify with local authorities before improvements.
Building & site characteristics
From public records
Year built
1960
Construction
STEEL FRAME
Heating
CENTRAL
Cooling
Yes
Stories
2
Buildings
1
Units
1
Bathrooms
6
Lot
1.64 ac
Current owner
From public records · entity-resolved
Ast LLC
Entity
Free & Clear · 20 yrs held
Mailing address
21 B ST, BURLINGTON, MA 01803-3485
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
5 recorded events · public records
Date
Price
Buyer
Seller
Deed Type
Mortgage
Jun 8, 2006
$2,631,000
Ast LLC
Kdms LLC
Grant Deed
—
May 19, 2004
—
Kdms LLC
—
Deed Of Trust
related
$1,850,000 · Medford Capital Bank
Nov 16, 1998
—
Kdm Ltd Liability Co
—
Deed Of Trust
related
$1,000,000 · Bay Colony Dev Corp
Jul 8, 1997
$1,550,000
Kdms Ltd Liability Co
Redfield Ft
Grant Deed
$1,216,250 · Boston Private Bank
Jul 8, 1997
—
Kdms Ltd Liability Co
—
Deed Of Trust
related
$973,000 · Boston Private 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.
Try Rey
Ask anything about this address in plain English.
“Is 15.6% cap rate sustainable?” · “Best tenant mix for BU1?” · “What’s the redev upside?”
You own 21 B St?
List it free. Reach 20,000 daily buyers.
We’ve already pulled the facts. Confirm photos + price and you’re live in 2 minutes.
List this address →
Full reports are paid
Unlock the full Property Analytics report
Start free for 7 days — no card required. Full owner contacts, all 4 valuations with methodology, refine flow, comparable adjustments, foot-traffic deep dive, export to PDF / CSV.
