21 PROSPECT ST
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Location
21 PROSPECT ST
Mblu
244/ 0332/ 00200/ /
Acct#
244 0332 00200
Owner
YALE UNIVERSITY
Total Market Value
$71,836,240
Appraisal
$102,623,200
PID
13878
Building Count
4
Current Value
Appraisal
Valuation YearImprovementsLandTotal
2025$98,470,000$4,153,200$102,623,200
Assessment
Valuation YearImprovementsLandTotal
2025$68,929,000$2,907,240$71,836,240

Owner of Record
OwnerYALE UNIVERSITY
Co-Owner
AddressYALE UNIVERSITY CONTROLLER FRA
PO BOX 208372
NEW HAVEN, CT 06520-8372
Sale Price$0
Certificate
Book & Page 9091/0251
Sale Date12/20/2013
Instrument3

Ownership History
Ownership History
OwnerSale PriceCertificateBook & PageInstrumentSale Date
YALE UNIVERSITY$0 9091/0251312/20/2013
SHEFFIELD SCIENTIFIC SCHOOL $0 0/0  

Building Information
Building 1 : Section 1
Year Built: 1968
Living Area: 101,654
Replacement Cost: $56,713,720
Building Percent Good: 81
Replacement Cost
Less Depreciation:
$45,938,100
Building Attributes
FieldDescription
Style:Laboratory
ModelCommercial
GradeVg/Exc
Stories:6
Occupancy1.00
Exterior Wall 1Pre-cast Concr
Exterior Wall 2 
Roof StructureFlat
Roof CoverT&G/Rubber
Interior Wall 1Drywall/Plaste
Interior Wall 2Minim/Masonry
Interior Floor 1Vinyl/Asphalt
Interior Floor 2Concr Abv Grad
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 PKGS
Frame TypeMASONRY
Baths/PlumbingAVERAGE
Ceiling/WallSUS-CEIL & WL
Rooms/PrtnsAVERAGE
Wall Height9.00
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
FUSFinished Upper Story 77,726 73,840
FLLFinished Lower Level 14,553 11,642
BASFirst Floor 10,191 10,191
FBMFinished Basement 9,969 5,981
FOPOpen Porch 5,529 0
PTOPatio 27,516 0
UBMUnfinished Basement 12,963 0
   158,447 101,654
Building 2 : Section 1
Year Built: 1895
Living Area: 42,984
Replacement Cost: $24,731,790
Building Percent Good: 75
Replacement Cost
Less Depreciation:
$18,548,800
Building Attributes : Bldg 2 of 4
FieldDescription
Style:Classroom
ModelCommercial
GradeVery Good
Stories:5
Occupancy1.00
Exterior Wall 1Brick
Exterior Wall 2 
Roof StructureFlat
Roof CoverT&G/Rubber
Interior Wall 1Drywall/Plaste
Interior Wall 2 
Interior Floor 1Carpet
Interior Floor 2 
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 PKGS
Frame TypeSTEEL
Baths/PlumbingAVERAGE
Ceiling/WallCEIL & WALLS
Rooms/PrtnsAVERAGE
Wall Height12.00
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
FUSFinished Upper Story 31,840 30,248
BASFirst Floor 7,960 7,960
FBMFinished Basement 7,960 4,776
   47,760 42,984
Building 3 : Section 1
Year Built: 2004
Living Area: 47,084
Replacement Cost: $26,808,688
Building Percent Good: 93
Replacement Cost
Less Depreciation:
$24,932,100
Building Attributes : Bldg 3 of 4
FieldDescription
Style:Laboratory
ModelCommercial
GradeVery Good
Stories:4
Occupancy 
Exterior Wall 1Glass/Thermo.
Exterior Wall 2Stone
Roof StructureFlat
Roof CoverT&G/Rubber
Interior Wall 1Drywall/Plaste
Interior Wall 2 
Interior Floor 1Concr-Finished
Interior Floor 2Vinyl/Asphalt
Heating FuelGas/Oil
Heating TypeFA/HW/ST
AC TypeCentral
Bldg UsePVT UNIV MDL-94
Total Rooms 
Total Bedrms00
Total Baths0
NBHD Code 
1st Floor Use:904C
Heat/ACHEAT/AC PKGS
Frame TypeMASONRY
Baths/PlumbingAVERAGE
Ceiling/WallSUS-CEIL & WL
Rooms/PrtnsAVERAGE
Wall Height12.00
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
FUSFinished Upper Story 22,946 21,799
BASFirst Floor 10,720 10,720
FLLFinished Lower Level 10,720 8,576
FHSFinished Half Story 9,214 5,989
   53,600 47,084
Building 4 : Section 1
Year Built: 2020
Living Area: 11,095
Replacement Cost: $3,743,897
Building Percent Good: 199
Replacement Cost
Less Depreciation:
$7,450,400
Building Attributes : Bldg 4 of 4
FieldDescription
Style:Classroom
ModelCommercial
GradeGRADE A++
Stories:2
Occupancy1.00
Exterior Wall 1Glass/Thermo.
Exterior Wall 2 
Roof StructureSteel Frm/Trus
Roof CoverMetal/Tin
Interior Wall 1Cust Wd Panel
Interior Wall 2 
Interior Floor 1Concr-Finished
Interior Floor 2 
Heating FuelSolar Assisted
Heating TypeGeo-Thermal
AC TypeVapor Cooler
Bldg UsePVT UNIV MDL-94
Total Rooms 
Total Bedrms 
Total Baths 
NBHD Code 
1st Floor Use: 
Heat/ACHEAT/AC PKGS
Frame TypeSPECIAL
Baths/PlumbingEXTENSIVE
Ceiling/WallCEIL & WALLS
Rooms/PrtnsABOVE AVERAGE
Wall Height14.00
% Comn Wall 
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
BASFirst Floor 6,728 6,728
FHSFinished Half Story 6,719 4,367
SLBSlab 6,719 0
   20,166 11,095

Extra Features
Extra Features
CodeDescriptionSizeValueAssessed ValueBldg #
ELV2PASS ELEV6.00 STOPS$139,500$97,6502
ELV2PASS ELEV7.00 STOPS$177,900$124,5301
SPR1SPRINKLERS-WET49000.00 S.F.$118,500$82,9503
ELV2PASS ELEV5.00 STOPS$116,300$81,4102
ELV2PASS ELEV5.00 STOPS$144,200$100,9403
ELV1FREIGHT ELEV6.00 STOPS$94,900$66,4303
ELV2PASS ELEV7.00 STOPS$177,900$124,5301
SPR1SPRINKLERS-WET42984.00 S.F.$83,800$58,6602
ELV2PASS ELEV2.00 STOPS$50,800$35,5601
SPR1SPRINKLERS-WET39664.00 S.F.$95,900$67,1303
SPR1SPRINKLERS-WET101208.00 S.F.$215,800$151,0601
ELV2PASS ELEV3.00 STOPS$93,000$65,1004
SPR2WET/CONCEALED11095.00 S.F.$34,400$24,0804

Land
Land Use
Use Code904C
DescriptionPVT UNIV MDL-94  
ZoneRH2
Neighborhood1500
Alt Land ApprNo
Category
Land Line Valuation
Size (Acres)1.45
Frontage0
Depth0
Total Market Land$2,907,240
Appraised Value$4,153,200

Outbuildings
Outbuildings
CodeDescriptionSub CodeSub DescriptionSizeValueAssessed ValueBldg #
PAV1PAVING-ASPHALT  18775.00 S.F.$57,700$40,3901
Valuation History
Appraisal
Valuation YearImprovementsLandTotal
2025$98,470,000$4,153,200$102,623,200
2024$94,763,500$4,153,200$98,916,700
2023$94,763,500$4,153,200$98,916,700

Assessment
Valuation YearImprovementsLandTotal
2025$68,929,000$2,907,240$71,836,240
2024$66,334,450$2,907,240$69,241,690
2023$66,334,450$2,907,240$69,241,690

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