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4545 Sioux Dr, Boulder, CO 80303 Property Records

Boulder County property record for 4545 Sioux Dr, Boulder, CO 80303

Property Summary

Property TypeExempt (Full or Partial)
Details31,784 sqft · built 1970
Lot Size8.39 acres (365,706 sqft)
OwnerCompany Name on Record
Flood ZoneZone X (minimal risk)
APN1577-04-2-10-002

Property Details

APN / Parcel Number

Primary APN1577-04-2-10-002
Alternative APNs
  • R0085647
  • 0085647

Interior

Stories1 Story
Building Area31,784 sqft
1st Floor Area31,784 sqft

Exterior

Year BuiltBuilt 1970
Effective Year BuiltEffective 1975
Construction TypeBrick
Lot Area365,706 sqft

Utilities, Heating & Cooling

Cooling SystemHVAC
Heating SystemForced Air with A/C

Location & Zoning

Account NumberR0085647
Street Address4545 SIOUX DR
CityBOULDER
StateCO
Zip80303-3732
Property CategoryOther
Property TypeOther > Exempt (Full or Partial)
Legal DescriptionOUTLOT 1 & SLY 54.76 FT OF OUTLOT 2 BLK 7 FRASIER MEADOWS - HORIZONS K-8
Legal Range70
Legal Township1S
Legal Section04
Legal SubdivisionFRASIER MEADOWS - BO
Legal Block7
Legal Lot Number1
JurisdictionBOULDER CO
Township / Civil DivisionBOULDER
Census Block Group2
Census Block2008
Census Tract12511

Owner

Source: Boulder County records, as of September 18, 2026

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

Owner of RecordCompany Name on Record
Mailing Address6500 ARAPAHOE RD, BOULDER, CO 80303-1407
Owner TypeCompany

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesName on Deed
Last SaleOct 23, 1958
Deed SaleOct 23, 1958
Deed Document Number1958620994
Record UpdatedOct 29, 2026

Tax Assessment & Valuation

Source: Boulder County assessment roll, as of September 18, 2026

Property Jurisdictions

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

Tax Bill & Assessment History

YearTax BillAssessed ValueAssessed Market Value
2026$1,465,516 (-3.7%) Land $960,414 Building $505,102$5,636,600 (-) Land $3,693,900 Building $1,942,700
2025Additional exemption filed$1,521,882 (-3.23%) Land $997,353 Building $524,529$5,636,600 (-) Land $3,693,900 Building $1,942,700
2023Additional exemption filed$1,572,611 Land $1,030,598 Building $542,013$5,636,600 Land $3,693,900 Building $1,942,700

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

Flood

Source: FEMA National Flood Hazard Layer, effective October 14, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it
Flood Insurance CostPremium on Record
median of 15 policies
Community Rating SystemClass 5 (25% premium discount)
Nearby Flood Policies15 in force
Nearby Flood Claims5 (1982–2013)
Claims Outside the SFHA5 of 5
Most Recent ClaimSep 2013 · Severe Storms, Flooding, Landslides, And Mudslides
Claims by Event
  • Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 4 claims

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.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskLow
lower than 80% of the US · lower than 91% of Colorado
Wildfire Likelihood0.01% annual chance
ExposureDirect
burnable vegetation

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemCITY OF BOULDER
serves 166,080 people · EPA ID CO0107152
Water SourceSurface water
Last State InspectionSep 2024
Lead2 ppb (2023–2025)
action level 15 ppb

Violations Reported to EPA

Water QualityHaloacetic acids
resolved · Jul 2017
Treatment and ProcedureNone
last 10 years
Monitoring and Reporting1
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 331 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Ayva Networks
Fixed Wireless		2,500 / 2,500
Xfinity
Cable		2,000 / 250
Verizon
Fixed Wireless		300 / 20
LiveWireNet
Fixed Wireless		250 / 100
T-Mobile
Fixed Wireless		100 / 20

May also be available: AT&T, CenturyLink.

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