423 PROSPECT ST
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Location
423 PROSPECT ST
Mblu
248/ 0395/ 00204/ /
Acct#
248 0395 00204
Owner
YALE UNIVERSITY
Total Market Value
$61,478,410
Appraisal
$87,826,300
PID
14083
Building Count
2
Current Value
Appraisal
Valuation YearImprovementsLandTotal
2025$79,831,900$7,994,400$87,826,300
Assessment
Valuation YearImprovementsLandTotal
2025$55,882,330$5,596,080$61,478,410

Owner of Record
OwnerYALE UNIVERSITY
Co-Owner
AddressYALE U CONTROLLER FRA
PO BOX 208372
NEW HAVEN, CT 06520-8372
Sale Price$0
Certificate
Book & Page 0/0
Sale Date01/01/1900
Instrument

Ownership History
Ownership History
OwnerSale PriceCertificateBook & PageInstrumentSale Date
YALE UNIVERSITY $0 0/0 01/01/1900

Building Information
Building 1 : Section 1
Year Built: 1932
Living Area: 106,266
Replacement Cost: $65,259,517
Building Percent Good: 73
Replacement Cost
Less Depreciation:
$47,639,400
Building Attributes
FieldDescription
Style:Res College
ModelCommercial
GradeGood
Stories:3
Occupancy1.00
Exterior Wall 1Brick
Exterior Wall 2 
Roof StructureGable/Hip
Roof CoverSlate
Interior Wall 1Plastered/Dryw
Interior Wall 2 
Interior Floor 1Carpet
Interior Floor 2Vinyl/Asphalt
Heating FuelGas/Oil
Heating TypeHot Water
AC TypeCentral
Bldg UsePVT UNIV MDL-94
Total Rooms 
Total Bedrms00
Total Baths0
NBHD Code 
1st Floor Use:904C
Heat/ACHEAT/AC SPLIT
Frame TypeMASONRY
Baths/PlumbingAVERAGE
Ceiling/WallCEIL & WALLS
Rooms/PrtnsAVERAGE
Wall Height9.00
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
BASFirst Floor 61,370 61,370
FUSFinished Upper Story 35,890 34,096
FBMFinished Basement 18,000 10,800
UBMUnfinished Basement 42,000 0
   157,260 106,266
Building 2 : Section 1
Year Built: 2025
Living Area: 41,870
Replacement Cost: $32,808,327
Building Percent Good: 95
Replacement Cost
Less Depreciation:
$31,167,900
Building Attributes : Bldg 2 of 2
FieldDescription
Style:Res College
ModelCommercial
GradeExcellent +
Stories:3
Occupancy1.00
Exterior Wall 1Precast Panel
Exterior Wall 2 
Roof StructureGable/Hip
Roof CoverAsphalt
Interior Wall 1Drywall/Plaste
Interior Wall 2 
Interior Floor 1Terrazzo Monol
Interior Floor 2Vinyl/Asphalt
Heating FuelGas/Oil
Heating TypeHeat pump
AC TypeHeat Pump
Bldg UsePVT UNIV MDL-94
Total Rooms 
Total Bedrms 
Total Baths 
NBHD Code 
1st Floor Use: 
Heat/ACHEAT/AC PKGS
Frame TypeFIREPRF STEEL
Baths/PlumbingABOVE AVERAGE
Ceiling/WallTYPICAL
Rooms/PrtnsABOVE AVERAGE
Wall Height 
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
FUSFinished Upper Story 28,876 27,432
BASFirst Floor 13,499 13,499
AOFOffice 939 939
   43,314 41,870

Extra Features
Extra Features
CodeDescriptionSizeValueAssessed ValueBldg #
SPR1SPRINKLERS-WET115260.00 S.F.$218,800$153,1601
ELV2PASS ELEV2.00 STOPS$45,300$31,7101
ELV2PASS ELEV3.00 STOPS$67,900$47,5301
ELV2PASS ELEV2.00 STOPS$45,300$31,7101
ELV2PASS ELEV3.00 STOPS$67,900$47,5301
ELV2PASS ELEV3.00 STOPS$67,900$47,5301
ELV2PASS ELEV4.00 STOPS$124,000$86,8002
ELV2PASS ELEV4.00 STOPS$124,000$86,8002
ELV2PASS ELEV4.00 STOPS$124,000$86,8002
SPR2WET/CONCEALED45000.00 S.F.$139,500$97,6502

Land
Land Use
Use Code904C
DescriptionPVT UNIV MDL-94  
ZoneRM2
Neighborhood1500
Alt Land ApprNo
Category
Land Line Valuation
Size (Acres)5.51
Frontage0
Depth0
Total Market Land$5,596,080
Appraised Value$7,994,400

Outbuildings
Outbuildings

No Data for Outbuildings

Valuation History
Appraisal
Valuation YearImprovementsLandTotal
2025$79,831,900$7,994,400$87,826,300
2024$48,152,500$7,994,400$56,146,900
2023$48,152,500$7,994,400$56,146,900

Assessment
Valuation YearImprovementsLandTotal
2025$55,882,330$5,596,080$61,478,410
2024$33,706,750$5,596,080$39,302,830
2023$33,706,750$5,596,080$39,302,830

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