3171 4th St, Boulder, CO 80304 Property Records

Boulder County property record for 3171 4th St, Boulder, CO 80304

Property Summary

Property Type	Single Family Home
Details	3 bd · 3.25 ba · 1,854 sqft · built 1940
Lot Size	0.141 acres (6,148 sqft)
Owner	2 Individual Names on File
Last Sale	$1,575,000 (Aug 2019)
Tax Bill	$11,617 (2025)
Deeds & Mortgages	Aug 2021 Mortgage Aug 2019 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`1461-24-3-08-021`

Property Details

APN / Parcel Number

Primary APN	`1461-24-3-08-021`
Alternative APNs	`R0001732` `0001732`

Interior

Bedrooms	3 Beds
Full Baths	3.25 Baths
Half Baths	3 Half Baths
Total Rooms	9 Rooms
Building Area	1,854 sqft Living Area
1st Floor Area	1,204 sqft
Basement Area	650 sqft
Finished Basement	650 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1940
Effective Year Built	Effective 2000
Architectural Style	Split Level
Exterior Material	Wood Shingle
Construction Type	Frame
Roof Material	Asphalt
Lot Area	6,148 sqft (0.141 acres)
Garage Type	Detached
Garage Area	265 sqft
Deck Area	180 sqft
Total Buildings	2 Buildings

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Hot Water

Location & Zoning

Account Number	R0001732
Street Address	3171 4TH ST
City	BOULDER
State	CO
Zip	80304-2544
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOTS 43 & 44 BLK 44 NEWLANDS
Legal Range	71
Legal Township	1N
Legal Section	24
Legal Subdivision	NEWLANDS - BO
Legal Block	44
Legal Lot Number	43
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3010
Census Tract	12101

Owner

Source: Boulder County assessment roll, as of June 15, 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	3171 4TH ST, BOULDER, CO 80304-2544
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Aug 16, 2021	Deed of Trust, Mortgage · Conventional Mortgage BANK OF AMERICA NA
Aug 23, 2019	Warranty Deed, Transfer · ARM GUILD MORTGAGE CO

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	Aug 23, 2019 · Amount on Record
Deed Sale	Aug 23, 2019 · Amount on Record
Prior Sale	Feb 8, 2007 · Amount on Record
Deed Document Number	20193731985
Record Updated	Sep 20, 2026

August 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	3171 4TH ST, BOULDER, CO 80304-2544
Transaction Type	Mortgage
Record Updated	Apr 15, 2022
Title Company	TITLE COMPANY/THE ROCKIES INC, TITLE COMPANY OF THE ROCKIES

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2015 TULIP TREE LN, LA CANADA, CA 91011-1528

Mortgage

Document Number	0003906876
Date	Aug 16, 2021
Instrument	3906876

Lender

Name	BANK OF AMERICA NA
Type	Bank
Address	CHARLOTTE, NC 28255

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Sep 1, 2051

August 2019: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Aug 23, 2019
Property Address	3171 4TH ST, BOULDER, CO 80304-2544
Document Number	0003731985
Instrument Date	Aug 19, 2019
Instrument	3731985
Transaction Type	Transfer
Record Updated	Apr 15, 2022
Title Company	HERITAGE TITLE CO

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on File
Loan-to-Value (LTV)	LTV on Record
Tax	$157.50
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	3171 4TH ST, BOULDER, CO 80304-2544

Mortgage

Document Number	0003731988
Date	Aug 23, 2019
Instrument	3731988

Lender

Name	GUILD MORTGAGE CO
Type	Mortgage Company

Agreement

Type	ARM
Amount	Amount Recorded
Term	361 Months
Due	Sep 1, 2049

Interest

Rate Type	Adjustable Rate
Rate	3.25%
Adjustable	Adjustable Rate Rider
Type Change Date	Sep 1, 2024
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	5.25%
Index	1-Year LIBOR
Max Rate	8.25%

Tax Assessment & Valuation

Source: Boulder County assessment roll, as of June 15, 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

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$132,566 (+8.8%) Land $92,514 Building $40,052	$1,949,500 (-) Land $1,360,500 Building $589,000
2025	$11,617.00 (+4.37%)	$121,844 (-8.1%) Land $85,031 Building $36,813	$1,949,500 (-1.49%) Land $1,360,500 Building $589,000
2023	$11,131.00 (+16.21%)	$132,586 (+28.54%) Land $94,242 Building $38,344	$1,978,900 (+33.34%) Land $1,406,600 Building $572,300
2022	$9,578.00	$103,145 Land $67,679 Building $35,466	$1,484,100 Land $973,800 Building $510,300

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.

Flood

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

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 14 policies
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	14 in force
Nearby Flood Claims	4 (1995–2013)
Claims Outside the SFHA	4 of 4
Most Recent Claim	Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 3 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 Risk	High above 77% of the US · above 78% of Colorado
Wildfire Likelihood	0.6% annual chance
Exposure	Direct burnable vegetation at the parcel

Drinking Water

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

Water System	CITY OF BOULDER serves 166,080 people · EPA ID CO0107152
Water Source	Surface water
Last State Inspection	Sep 2024
Lead	2 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	Haloacetic acids resolved · Jul 2017
Treatment and Procedure	None last 10 years
Monitoring and Reporting	1 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 431 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Ayva Fixed Wireless	2,500 / 2,500
Lumen Technologies Fiber	2,000 / 1,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Live Wire Networks Fixed Wireless	250 / 100

May also be available: T-Mobile USA.

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