3631 21st St, Boulder, CO 80304 Property Records

Boulder County property record for 3631 21st St, Boulder, CO 80304 · Last verified July 2026

Property Highlights

Property Type	Residential > Single Family > Home
Bedrooms	5 Beds
Bathrooms	4.25 Baths
Year Built	Built 1997
Square Footage	6,555 sqft Living Area
Lot Size	33,663 sqft (0.773 acres)
Occupancy	Owner Occupied
Last Sale	$1,743,000 (2011)
Tax Bill	$21,816.00 (2025)

Property Details

APN / Parcel Number

Primary APN	`1463-19-1-31-006`
Alternative APNs	`R0105366` `0105366`

Interior

Bedrooms	5 Beds
Full Baths	4.25 Baths
Partial Baths	2 Partial Baths
Total Rooms	12 Rooms
Building Area	6,555 sqft Living Area
Gross Area	7,688 sqft Gross Area
1st Floor	2,450 sqft 1st Floor
Upper Floors	2,044 sqft Upper Floors
Basement Area	2,290 sqft Basement
Finished Basement	2,061 sqft Finished
Unfinished Basement	229 sqft Unfinished
Stories	2 Stories
Interior Structure	Wallboard/Drywall Interior Structure

Exterior

Year Built	Built 1992
Effective Year Built	Effective 1997
Architectural Style	A-Frame Style
Exterior Material	Combination Exterior
Construction Type	Frame Construction
Roof Material	Asphalt Roof
Lot Area	33,663 sqft (0.773 acres)
Parking Spaces	4 Parking Spaces
Garage Type	Attached Garage
Garage Area	904 sqft Garage

Exterior Amenities

Deck Area	40 sqft Deck
Patio Area	552 sqft Patio
Porch	Porch
Porch Area	624 sqft Porch

Utilities and HVAC

Cooling System	Central Cooling
Heating System	Hot Water Heating

Location & Zoning

Account Number	R0105366
Street Address	3631 21ST ST
City	BOULDER
State	CO
Zip	80304-1607
Property Usage	Residential Property Usage
Type	Residential > Single Family > Home
Legal Description	LOT 4 21ST/LINDEN
Legal Range	70
Legal Township	1N
Legal Section	19
Legal Subdivision	21ST/LINDEN SUB - BO
Legal Block	1
Legal Lot Number	4
Jurisdiction	BOULDER CO
Minor Civil Division	BOULDER
Census Blockgroup	1
Census Block	1000
Census Tract	12103

Owner

Source: Boulder County records · APN 1463-19-1-31-006

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

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

Owner of Record	Individual Owner on File
Mailing Address	3631 21ST ST, BOULDER, CO 80304-1607
Occupancy	Owner Occupied
Owner Type	Owner is an Individual, Couple or Unincorporated Entity

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Known Transactions	Last Sale Amount on Apr 04, 2011 Deed Sale Price on Apr 04, 2011 Prior Sale Amount on Feb 27, 2006
Deed Doc Number	20113141765
Last Transfer Date	Dec 30, 2016
Transfer Doc	0003566866
Record Refreshed	Sep 20, 2026

Tax Assessment & Valuation

Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified July 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		$248,935 (+8.8%) Land $82,933 Building $166,002	$3,660,800 (-) Land $1,219,600 Building $2,441,200
2025	$21,816.00 (-1.14%)	$228,800 (-11.73%) Land $76,225 Building $152,575	$3,660,800 (-5.38%) Land $1,219,600 Building $2,441,200
2023	$22,067.00 (+11.26%)	$259,216 (+21.36%) Land $79,609 Building $179,607	$3,868,900 (+25.89%) Land $1,188,200 Building $2,680,700
2022	$19,834.00	$213,587 Land $63,669 Building $149,918	$3,073,200 Land $916,100 Building $2,157,100