45 HARTWELL AVE
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Location
45 HARTWELL AVE
Mblu
85/ / 18A/ /
Acct#
Owner
UNITED THERAPEUTICS CORPORATION
Total Market Value
$20,535,000
PID
11799
Building Count
1
Current Value
Assessment
Valuation YearImprovementsLandTotal
2026$17,152,000$3,383,000$20,535,000

Owner of Record
OwnerUNITED THERAPEUTICS CORPORATION
Co-Owner
Address1000 SPRING ST
SILVER SPRING, MD 20910
Sale Price$21,500,000
Certificate
Book & Page 84709/142
Sale Date10/08/2025
Instrument00

Ownership History
Ownership History
OwnerSale PriceCertificateBook & PageInstrumentSale Date
UNITED THERAPEUTICS CORPORATION$21,500,000 84709/1420010/08/2025
BRAMMER BIO MA LLC$18,000,000 71790/05121C10/25/2018
DUFFY HARTWELL LLC$1 27574/03451B08/14/1997
DUFFY HARTWELL LIMITED PARTNERSHIP$2,000,000 25586/0407 08/22/1995
EQUITABLE PACIFIC PARTNERS LIMITED PARTN$4,850,000 18782/0349UNKQ12/24/1987

Building Information
Building 1 : Section 1
Year Built: 1961
Living Area: 49,880
Replacement Cost: $21,352,634
Building Percent Good: 80
Replacement Cost
Less Depreciation:
$17,082,000
Building Attributes
FieldDescription
Style:LAB/OFFICE
ModelIndustrial
GradeC+
Stories:1
Occupancy1.00
Exterior Wall 1BRICK VENEER
Exterior Wall 2 
Roof StructureFLAT
Roof CoverT&G RESDEN
Interior Wall 1PLASTER
Interior Wall 2 
Interior Floor 1HARDWOOD
Interior Floor 2CER/CLAY/TILE
Heating FuelOIL
Heating TypeHOT WATER
AC TypeCENTRAL
Bldg UseLAB OFFICE
Total Rooms 
Total Bedrms00
Total Baths0
1st Floor Use:4040
Heat/ACHEAT/AC SPLIT
Frame TypeREINF. CONCR
Baths/PlumbingAVERAGE
Ceiling/WallSUS-CEIL & WL
Rooms/PrtnsAVERAGE
Wall Height12.00
% Comn Wall0.00
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
BASFirst Floor 49,880 49,880
FOPPorch, Open, Finished 80 0
   49,960 49,880

Extra Features
Extra Features
CodeDescriptionSizeBldg #
CNP2GOOD QUALITY170.00 S.F.1
LDL1LOAD LEVELERS1.00 UNITS1

Land
Land Use
Use Code4060
DescriptionLAB OFFICE  
ZoneCM
NeighborhoodB
Alt Land ApprNo
Category
Land Line Valuation
Size (Sqr Feet)203425
Frontage510
Depth0
Total Market Land$3,383,000

Outbuildings
Outbuildings
CodeDescriptionSub CodeSub DescriptionSizeBldg #
PAV1PAVING-ASPHALT  60000.00 S.F.1
LT1LIGHTS-IN W/PL  6.00 UNITS1
SGN2DOUBLE SIDED  16.00 S.F.&HGT1
Valuation History
Assessment
Valuation YearImprovementsLandTotal
2026$17,152,000$3,383,000$20,535,000
2025$18,677,000$3,366,000$22,043,000
2024$18,335,000$3,205,000$21,540,000
2023$15,681,000$2,919,000$18,600,000

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