321 ARSENAL ST
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Location
321 ARSENAL ST
Mblu
1301/ 1/ 1321A/ /
Acct#
12473
Owner
ARE-MA REGION NO. 75 LLC
Total Market Value
$9,193,200
PID
12473
Building Count
1
Current Value
Assessment
Valuation YearImprovementsLandTotal
2026$9,193,200$0$9,193,200

Owner of Record
OwnerARE-MA REGION NO. 75 LLC
Co-OwnerC/O ALEXANDRIA REAL ESTATE
AddressPO BOX 847
CARLSBAD, CA 92018
Sale Price$525,500,000
Certificate
Book & Page 73848/56
Sale Date12/18/2019
Instrument1O

Ownership History
Ownership History
OwnerSale PriceCertificateBook & PageInstrumentSale Date
ARE-MA REGION NO. 75 LLC $525,500,000 73848/561O12/18/2019
ATHENA ARSENAL LLC $168,500,000 61782/351U05/13/2013
HARVARD UNIVERSITY $162,641,904 32863/5261D05/15/2001
CHARLES RIVER BUS CTR ASSOC. $20,100,00029502/09229502/0921O12/10/1998
UNITED STATES OF AMERICA$7,500,00029012/42229012/4221E08/25/1998

Building Information
Building 1 : Section 1
Year Built: 1862
Living Area: 34,016
Replacement Cost: $8,539,743
Building Percent Good: 95
Replacement Cost
Less Depreciation:
$8,112,800
Building Attributes
FieldDescription
StyleOffice Bldg
ModelCommercial
GradeVery Good
Stories2.5
Exterior Wall 1Brick
Exterior Wall 2 
Roof StructureGable
Roof CoverSlate
Int Wall 1Minimum
Int Wall 2Drywall
Int Floor 1Carpet
Int Floor 2 
Heat FuelGas
Heat TypeForced H/A
AC Percent100
Full Baths10
Half Baths0
FrameSteel
Plumbing 
Wall Height14.00
Fireplace(s)0
Fireplace RatingAverage
Kitchen RatingNone
% Sprinkler100
Half Bath RatingNone
Living Units3
Full Bath RatingGood
Kitchens0
Bsmt Garage0
FoundationSlab
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
FUSFinished Upper Story 19,520 19,520
BASBase Floor 14,496 14,496
   34,016 34,016

Extra Features
Extra Features
CodeDescriptionSizeValueBldg #
ELV1Pass Elev 1-3stop4.00 UNITS$115,0001
ELV1Pass Elev 1-3stop4.00 UNITS$306,4001
MSC18Crane50.00 UNITS$1,5001

Land
Land Use
Use Code404C
DescriptionR+D BLD  
Zone
NeighborhoodCE
Alt Land ApprNo
Category
Land Line Valuation
Size (Acres)0
Frontage
Depth
Total Market Land$0

Outbuildings
Outbuildings
CodeDescriptionSub CodeSub DescriptionSizeValueBldg #
LT2W/Double Light  1.00 UNITS$15,5001
LT1Lights-In W/Pl  1.00 UNITS$18,6001
PAV1Paving-Asphalt  12450.00 S.F$45,8001
LT2W/Double Light  1.00 UNITS$1,7001
Valuation History
Assessment
Valuation YearImprovementsLandTotal
2025$398,835,500$134,308,400$533,143,900
2024$407,715,992$92,626,500$500,576,992
2023$337,262,900$67,724,000$405,221,400

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