25 UNION ST
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Location
25 UNION ST
Mblu
4232/ / 218/ /
Acct#
00009941
Owner
DIDRIKSEN STEPHEN P &
Assessment
$4,963,300
PID
9941
Building Count
1
Current Value
Assessment
Valuation YearImprovementsLandTotal
2026$2,439,200$2,524,100$4,963,300

Owner of Record
OwnerDIDRIKSEN STEPHEN P &
Co-OwnerBARONE KATHERINE DIDRIKSEN TR
AddressPO BOX 945
NANTUCKET, MA 02554
Sale Price$1
Certificate
Book & Page 2022/018
Sale Date07/29/2025
Instrument99

Ownership History
Ownership History
OwnerSale PriceCertificateBook & PageInstrumentSale Date
DIDRIKSEN STEPHEN P &$1 2022/0189907/29/2025
DIDRIKSEN STEPHEN P$2,365,000 1984/3241J08/19/2024
DIDRIKSEN STEPHEN P ETAL$0 1662/1429912/02/2018
DIDRIKSEN BRADFORD P TRST ETAL$0 1509/1269910/30/2015
DIDRIKSEN PHILIP JR TR ETAL$0 1171/3239902/23/2009

Building Information
Building 1 : Section 1
Year Built: 1806
Living Area: 3,537
Replacement Cost: $2,807,058
Building Percent Good: 86
Replacement Cost
Less Depreciation:
$2,414,100
Building Attributes
FieldDescription
Style:Antique
ModelResidential
Grade:Excellent
Stories:2 Stories
Occupancy1
Exterior Wall 1Wood Shingle
Exterior Wall 2Clapboard
Roof Structure:Gable/Hip
Roof CoverWood Shingle
Interior Wall 1Plastered
Interior Wall 2 
Interior Flr 1Pine/Soft Wood
Interior Flr 2 
Heat FuelOil
Heat Type:Hot Water
AC Type:None
Total Bedrooms:5 Bedrooms
Total Bthrms:2
Total Half Baths:1
Total Xtra Fixtrs: 
Total Rooms: 
Bath Style:Average
Kitchen Style:Modern
Num Kitchens01
Cndtn 
Num Park 
Fireplaces 
Fndtn Cndtn 
Basement 
Usrfld 706
Building Photo Building Photo
Building Layout Building Layout
Building Sub-Areas (sq ft)
CodeDescriptionGross
Area		Living
Area
BASFirst Floor 1,986 1,986
FUSUpper Story, Finished 1,328 1,328
FATAttic, Finished 891 223
STPStoop 191 0
UATAttic, Unfinished 460 0
UBMBasement, Unfinished 1,788 0
WDKDeck, Wood 622 0
   7,266 3,537

Extra Features
Extra Features
CodeDescriptionSizeValueBldg #
FPL32 STORY CHIM2.00 UNITS$21,0001
FPOEXTRA FPL OPEN4.00 UNITS$4,1001

Land
Land Use
Use Code1010
DescriptionSingle Fam M01  
ZoneROH
Neighborhood950
Alt Land ApprNo
Category
Land Line Valuation
Size (Acres)0.14
Frontage0
Depth0
Assessed Value$2,524,100

Outbuildings
Outbuildings

No Data for Outbuildings

Valuation History
Assessment
Valuation YearImprovementsLandTotal
2026$2,439,200$2,524,100$4,963,300
2025$2,575,800$2,185,700$4,761,500
2024$2,507,500$2,226,200$4,733,700
2023$1,878,600$2,120,300$3,998,900
2022$1,571,200$1,929,000$3,500,200

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