421 Mapleton Ave, Apt A, Boulder, CO 80304 Property Records

Boulder County property record for 421 Mapleton Ave, Apt A, Boulder, CO 80304 · Last verified August 2026

Property Highlights

Property Type	Residential > Condominium / Townhouse > Condominium
Bedrooms	1 Beds
Bathrooms	1.75 Baths
Year Built	Built 1906
Square Footage	618 sqft Living Area
Lot Size	25 sqft (0.001 acres)
Occupancy	Owner Occupied
Last Sale	$727,000 (2026)
Tax Bill	$4,110.00 (2025)

Property Details

APN / Parcel Number

Primary APN	`1461-25-4-85-003`
Alternative APNs	`R0140895` `0140895`

Interior

Bedrooms	1 Beds
Full Baths	1.75 Baths
Partial Baths	1 Partial Baths
Total Rooms	3 Rooms
Units	3 Units
Building Area	618 sqft Living Area
1st Floor	618 sqft 1st Floor
Stories	1 Stories
Interior Structure	Wallboard/Drywall Interior Structure

Exterior

Year Built	Built 1906
Effective Year Built	Effective 1906
Architectural Style	Townhouse Style
Exterior Material	Combination Exterior
Construction Type	Masonry/Concrete Masonry Units (CMUs) Construction
Lot Area	25 sqft (0.001 acres)
Parking Spaces	1 Parking Spaces
Garage Type	Detached Garage
Garage Area	235 sqft Garage

Utilities and HVAC

Heating System	Hot Water Heating

Location & Zoning

Account Number	R0140895
Street Address	421 MAPLETON AVE, A
City	BOULDER
State	CO
Zip	80304-3962
Property Usage	Residential Property Usage
Type	Residential > Condominium / Townhouse > Condominium
Legal Description	UNIT 421A MAPLETON AVENUE CONDOMINIUMS & UND 9.07% INT IN GCE
Legal Range	71
Legal Township	1N
Legal Section	25
Legal Subdivision	MAPLETON AVENUE CONDOMINIUMS - BO
Legal Block	4
Legal Unit	421A
Jurisdiction	BOULDER CO
Minor Civil Division	BOULDER
Census Blockgroup	4
Census Block	4004
Census Tract	12101

Owner

Source: Boulder County records · APN 1461-25-4-85-003

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

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

Owner of Record	2 Individuals Owners
Mailing Address	421 MAPLETON AVE, A, BOULDER, CO 80304-3962
Occupancy	Owner Occupied
Owner Type	Owner is an Individual, Couple or Unincorporated Entity
Vesting	Tenants In Common

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Known Transactions	Last Sale Amount on Jul 27, 2026 Deed Sale Price on Jul 27, 2026 Prior Sale Amount on Oct 17, 2024
Deed Doc Number	20264141428
Prior Transfer Date	Oct 08, 2024
Prior Transfer Doc	0004064062
Record Refreshed	Sep 20, 2026

July 2026: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Jul 27, 2026
Document Number	0004141428
Instrument Date	Jul 24, 2026
Instrument	20264141428
Transaction Type	Transfer
Record Updated	Aug 05, 2026
Title Company	HERITAGE TITLE LT, HERITAGE TITLE

Transaction

Amount	Amount Recorded
Tax	$7,342.70
Amount Accuracy	Calculated from Tax (Full/Partial Unknown)
Additional	Arms Length Transaction

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Tenants In Common

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	Colorado
County	Boulder County
Municipality	Boulder City
Unified School District	Boulder 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.

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$46,900 (+8.8%) Building $46,900	$689,700 (-) Building $689,700
2025	$4,110.00 (+34.53%)	$43,106 (+10.32%) Building $43,106	$689,700 (+18.27%) Building $689,700
2023	$3,055.00 (-3.45%)	$39,072 (+14.66%) Building $39,072	$583,165 (+18.94%) Building $583,165
2022	$3,164.00	$34,076 Building $34,076	$490,300 Building $490,300