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401 18th St, Boulder, CO 80302 Property Records

Boulder County property record for 401 18th St, Boulder, CO 80302 · Last verified June 2026

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.75 ba · 4,015 sqft · built 2002
Lot Size0.258 acres (11,251 sqft)
Owner2 Individual Names on File
Last Sale$3,000,000 (May 2023)
Tax Bill$17,759 (2025)
Deeds & MortgagesMay 2023 Sale
Flood ZoneZone X (moderate risk)
APN1577-06-2-10-009

Property Details

APN / Parcel Number

Primary APN1577-06-2-10-009
Alternative APNs
  • R0002065
  • 0002065

Interior

Bedrooms4 Beds
Full Baths2.75 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Building Area4,015 sqft Living Area
Gross Area4,735 sqft
1st Floor Area2,140 sqft
Basement Area1,875 sqft
Finished Basement1,575 sqft
Unfinished Basement300 sqft
Interior WallsWallboard/Drywall

Exterior

Year BuiltBuilt 2002
Effective Year BuiltEffective 2002
Architectural StyleSplit Level
Exterior MaterialWood Shingle
Construction TypeFrame
Roof MaterialAsphalt
Lot Area11,251 sqft (0.258 acres)
Garage TypeAttached
Garage Area720 sqft
Parking Spaces3 Parking Spaces
Deck Area487 sqft

Utilities, Heating & Cooling

Cooling SystemEvaporative
Heating SystemRadiant

Location & Zoning

Account NumberR0002065
Street Address401 18TH ST
CityBOULDER
StateCO
Zip80302-7904
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionLOTS 11-12 BLK 15 FLORAL PARK
Legal Range70
Legal Township1S
Legal Section06
Legal SubdivisionFLORAL PARK & WEIHOFEN RESUB - BO
Legal Block15
Legal Lot Number11
JurisdictionBOULDER CO
Township / Civil DivisionBOULDER
Census Block Group1
Census Block1019
Census Tract12505

Owner

Source: Boulder County records · APN 1577-06-2-10-009

Assessment roll updated June 15, 2026 · Last verified June 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record2 Individual Names on File
Mailing Address401 18TH ST, BOULDER, CO 80302-7904
OccupancyOwner Occupied
Owner TypeIndividual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Verified Names on Deed
Last SaleMay 01, 2023 · Amount on Record
Deed SaleMay 01, 2023 · Amount on Record
Prior SaleMay 05, 2000 · Amount on Record
Deed Document Number20234005686
Prior Transfer DateApr 28, 2000
Prior Transfer Doc0002042738
Record UpdatedSep 20, 2026

May 2023: Warranty Deed, Transfer

Document TypeWarranty Deed
JurisdictionBOULDER CO
Recording DateMay 01, 2023
Property Address401 18TH ST, BOULDER, CO 80302-7904
Document Number0004005686
Instrument DateApr 28, 2023
Instrument4005686
Transaction TypeTransfer
Record UpdatedMay 10, 2023
Title CompanyFIDELITY NATIONAL TITLE

Transaction

AmountAmount Recorded
Tax$300.00
Amount AccuracyFull Amount Stated
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipJoint Tenants
Address401 18TH ST, BOULDER, CO 80302-7904

Tax Assessment & Valuation

Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 2026

Property Jurisdictions

TypeName
StateColorado
CountyBoulder County
MunicipalityBoulder City
Unified School DistrictBoulder Valley School District RE-2 (PK - 12)

Tax Bill & Assessment History

Assessed value and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

YearTax BillAssessed ValueAssessed Market Value
2026$202,646 (+8.8%) Land $80,430 Building $122,216$2,980,100 (-) Land $1,182,800 Building $1,797,300
2025$17,759.00 (+14.83%)$186,256 (+1.91%) Land $73,925 Building $112,331$2,980,100 (+9.25%) Land $1,182,800 Building $1,797,300
2023$15,465.00 (-0.05%)$182,762 (+10.22%) Land $75,321 Building $107,441$2,727,800 (+14.33%) Land $1,124,200 Building $1,603,600
2022$15,473.00$165,813 Land $61,716 Building $104,097$2,385,800 Land $888,000 Building $1,497,800

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Boulder County (08013C), updated October 14, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 080130125051, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood ZoneZone X
Special Flood Hazard AreaNo
Flood HazardModerate
500-Year FloodplainYes
Nearest Special Flood Hazard AreaZone AE, within 500 ft
Flood Insurance CostPremium on Record
median of 15 individual NFIP policies nearby
Community Rating SystemClass 5 (25% premium discount)
Nearby Flood Policies15 in force
Nearby Flood Claims12 (1994–2013)
Claims Outside the SFHA4 of 12
Most Recent ClaimSep 2013, river or lake flooding, Severe Storms, Flooding, Landslides, And Mudslides
Claims By Storm
  • Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 10 claims

Wildfire

Wildfire RiskModerate
above 67% of the US · above 60% of Colorado
Wildfire LikelihoodAbout 1 in 403 per year
ExposureIndirect
within ember reach

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 481 locations within about half a mile of this property

ProviderTechnologyDownload / Upload (Mbps)
AyvaFixed Wireless (unlicensed)2,500 / 2,500
Lumen TechnologiesFiber2,000 / 1,000
XfinityCable2,000 / 250
VerizonFixed Wireless300 / 20
Live Wire NetworksFixed Wireless (licensed-by-rule)250 / 100
T-Mobile USAFixed Wireless100 / 20

May also be available at this address: Lumen Technologies, Magnolia Road Internet Cooperative. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G and 4G LTE

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