1851 23rd St, Boulder, CO 80302 Property Records

Boulder County property record for 1851 23rd St, Boulder, CO 80302

Property Summary

Property Type	Single Family Home
Details	3 bd · 1.75 ba · 1,538 sqft · built 1923
Lot Size	0.256 acres (11,149 sqft)
Owner	2 Individual Names on File
Last Sale	$565,000 (May 2012)
Tax Bill	$10,519 (2025)
Deeds & Mortgages	Dec 2019 Mortgage
Flood Zone	Zone AE (high risk)
APN	`1463-30-4-47-008`

Property Details

APN / Parcel Number

Primary APN	`1463-30-4-47-008`
Alternative APNs	`R0004634` `0004634`

Interior

Bedrooms	3 Beds
Full Baths	1.75 Baths
Half Baths	1 Half Bath
Total Rooms	7 Rooms
Stories	1 Story
Building Area	1,538 sqft Living Area
1st Floor Area	1,538 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1923
Effective Year Built	Effective 1985
Architectural Style	Ranch
Exterior Material	Wood Shingle
Construction Type	Frame
Roof Material	Asphalt
Lot Area	11,149 sqft (0.256 acres)
Porch	Porch
Porch Area	112 sqft

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0004634
Street Address	1851 23RD ST
City	BOULDER
State	CO
Zip	80302-5603
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 8 & N 1/2 LOT 9 BLK C BOULDER EAST
Legal Range	70
Legal Township	1N
Legal Section	30
Legal Subdivision	BOULDER O T EAST & WEST & NORTH - BO
Legal Block	C
Legal Lot Number	8
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	2
Census Block	2011
Census Tract	12205

Owner

Source: Boulder County records · APN 1463-30-4-47-008

Assessment roll updated June 15, 2026 · Last verified June 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	PO BOX 18114, BOULDER, CO 80308-1114
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	May 01, 2012 · Amount on Record
Deed Sale	May 01, 2012 · Amount on Record
Prior Sale	Nov 21, 1995 · Amount on Record
Deed Document Number	20123219701
Last Transfer Date	Dec 18, 2019
Transfer Doc	0003757442
Record Updated	Sep 20, 2026

December 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	BOULDER CO
Recording Date	Dec 27, 2019
Property Address	1851 23RD ST, BOULDER, CO 80302-5603
Document Number	0003757442
Instrument Date	Dec 18, 2019
Instrument	3757442
Transaction Type	Transfer
Record Updated	Jan 13, 2020
Title Company	FIDELITY NATIONAL TITLE, FIDELITY NATIONAL TITLE CO

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	3960 VIEWPOINT WAY LAFAYETTE CO 800269655, LAFAYETTE, CO 80026-9655

Mortgage

Document Number	3757443
Date	Dec 27, 2019
Instrument	3757443

Lender

Name	ELEVATIONS CU
Address	BOULDER, CO 80301

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Dec 26, 2049

Tax Assessment & Valuation

Source: Boulder County records · Assessment roll updated June 15, 2026 · Last verified June 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		$88,652 (+8.8%) Land $79,499 Building $9,153	$1,303,700 (-) Land $1,169,100 Building $134,600
2025	$10,519.00 (+14.46%)	$81,482 (-12.02%) Land $73,069 Building $8,413	$1,303,700 (-5.69%) Land $1,169,100 Building $134,600
2024	$9,190.00 (+19.68%)
2023	$7,679.00 (+16.01%)	$92,614 (+31.22%) Land $83,353 Building $9,261	$1,382,300 (+36.12%) Land $1,244,070 Building $138,230
2022	$6,619.00	$70,578 Land $63,520 Building $7,058	$1,015,500 Land $913,950 Building $101,550

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of October 14, 2026 · FEMA NFIP claims and policies as of September 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone AE high risk
100-Year Floodplain	Yes 1% annual chance
Floodway	Yes
Base Flood Elevation	Varies along the reach; see FIRM
Flood Insurance Requirement	Required federally backed loans
Flood Insurance Cost	Premium on Record median of 31 individual policies
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	64 units insured incl. 33 condo units
Nearby Flood Claims	6 (2013)
Claims Outside the SFHA	2 of 6
Most Recent Claim	Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 6 claims

Wildfire

Wildfire Risk	Not rated no burnable land 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.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Ayva Fixed Wireless	2,500 / 2,500
Lumen Technologies Fiber · DSL in parts of the area	2,000 / 1,000
Xfinity Cable	2,000 / 250
Verizon Fixed Wireless	300 / 20
Live Wire Networks Fixed Wireless	250 / 100
T-Mobile USA Fixed Wireless	100 / 20

May also be available: AT&T.

Based on FCC filings for 663 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	CITY OF BOULDER serves 166,080 people
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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.