900 Union Ave, Boulder, CO 80304 Property Records

Boulder County property record for 900 Union Ave, Boulder, CO 80304 · Last verified August 2026

Property Summary

Property Type	Single Family Home
Details	4 bd · 3.5 ba · 4,164 sqft · built 2010
Lot Size	0.161 acres (7,019 sqft)
Owner	2 Individual Names on File
Tax Bill	$12,330 (2025)
Deeds & Mortgages	Jan 2023 Transfer
Flood Zone	Zone X (minimal risk)
APN	`1461-13-1-33-001`

Property Details

APN / Parcel Number

Primary APN	`1461-13-1-33-001`
Alternative APNs	`R0129926` `0129926`

Interior

Bedrooms	4 Beds
Full Baths	3.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	4,164 sqft Living Area
Gross Area	4,884 sqft
1st Floor Area	1,704 sqft
Upper Floors Area	642 sqft
Basement Area	2,478 sqft
Finished Basement	1,818 sqft
Unfinished Basement	660 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 2010
Effective Year Built	Effective 2010
Architectural Style	A-Frame
Exterior Material	Combination
Construction Type	Frame
Roof Material	Asphalt
Lot Area	7,019 sqft (0.161 acres)
Garage Type	Detached
Garage Area	460 sqft
Parking Spaces	2 Parking Spaces

Exterior Amenities

Porch	Enclosed Porch
Porch Area	200 sqft
Deck Area	195 sqft
Patio Area	395 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Radiant

Location & Zoning

Account Number	R0129926
Street Address	900 UNION AVE
City	BOULDER
State	CO
Zip	80304-0779
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 1 LANGFORD SUB
Legal Range	71
Legal Township	1N
Legal Section	13
Legal Subdivision	LANGFORD - BO
Legal Block	1
Legal Lot Number	1
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	1
Census Block	1018
Census Tract	12104

Owner

Source: Boulder County records · APN 1461-13-1-33-001

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 Individual Names on File
Mailing Address	900 UNION AVE, BOULDER, CO 80304-0779
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Transfer Date	Jan 26, 2023
Transfer Doc	0003995719
Record Updated	Sep 20, 2026

January 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	BOULDER CO
Recording Date	Jan 26, 2023
Property Address	900 UNION AVE, BOULDER, CO 80304-0779
Document Number	0003995719
Instrument Date	Jan 26, 2023
Instrument	3995719
Transaction Type	Transfer
Record Updated	Feb 01, 2023

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants

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 and are not market price estimates.

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$148,988 (+8.8%) Land $67,891 Building $81,097	$2,191,000 (-) Land $998,400 Building $1,192,600
2025	$12,330.00 (+12.46%)	$136,938 (-1.37%) Land $62,400 Building $74,538	$2,191,000 (+5.73%) Land $998,400 Building $1,192,600
2023	$10,964.00 (+9.69%)	$138,838 (+21.07%) Land $68,099 Building $70,739	$2,072,200 (+25.59%) Land $1,016,400 Building $1,055,800
2022	$9,995.00	$114,676 Land $54,558 Building $60,118	$1,650,000 Land $785,000 Building $865,000

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 080130121041, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X
Special Flood Hazard Area	No
Flood Hazard	Minimal
500-Year Floodplain	No
Flood Insurance Cost	Premium on Record median of 58 individual NFIP policies nearby
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	63 units insured (5 under condo master policies) 34 of 58 individual policies on primary residences
Nearby Flood Claims	14 (2013–2015)
Claims Outside the SFHA	6 of 14
Most Recent Claim	May 2015, other causes, Severe Storms, Tornadoes, Flooding, Landslides, And Mudslides
Flood Events	Severe Storms, Flooding, Landslides, And Mudslides (Sep 2013), 13 claims

Wildfire

Wildfire Risk	Moderate above 64% of the US · above 54% of Colorado
Wildfire Likelihood	About 1 in 437 per year
Exposure	Indirect 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.