455 S 43rd St, Boulder, CO 80305 Property Records

Boulder County property record for 455 S 43rd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,150 sqft · built 1956
Lot Size	0.161 acres (7,023 sqft)
Owner	2 Individual Names on File
Last Sale	$624,000 (Apr 2017)
Tax Bill	$4,784 (2025)
Deeds & Mortgages	Aug 2020 Mortgage Apr 2019 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`1577-05-4-25-017`

Property Details

APN / Parcel Number

Primary APN	`1577-05-4-25-017`
Alternative APNs	`R0009537` `0009537`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,150 sqft Living Area
Gross Area	2,500 sqft
1st Floor Area	1,150 sqft
Basement Area	1,150 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1956
Effective Year Built	Effective 1980
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	7,023 sqft (0.161 acres)
Garage Type	Attached
Garage Area	200 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0009537
Street Address	455 S 43RD ST
City	BOULDER
State	CO
Zip	80305-6007
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 17 BLK 8 MARTIN ACRES 2
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	MARTIN ACRES 2 - BO
Legal Block	8
Legal Lot Number	17
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3009
Census Tract	12507

Owner

Source: Boulder County records, as of September 18, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Individual Names on File
Mailing Address	455 S 43RD ST, BOULDER, CO 80305-6007
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Aug 17, 2020	Deed of Trust, Mortgage · Conventional Mortgage CHICAGO MORTGAGE SOLUTIONS CORP
Apr 12, 2019	Deed of Trust, Mortgage · Line of Credit THIRD FSLA OF CLEVELAND
Apr 27, 2017	Warranty Deed, Transfer · ARM DSW MORTGAGE INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Apr 27, 2017 · Amount on File
Deed Sale	Apr 27, 2017 · Amount on File
Prior Sale	Dec 13, 2007 · Amount on File
Deed Document Number	20173589037
Prior Transfer Date	Dec 10, 2007
Prior Transfer Doc	0002899527
Record Updated	Oct 29, 2026

August 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	455 S 43RD ST, BOULDER, CO 80305-6007
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003806913
Date	Aug 17, 2020
Instrument	3806913

Lender

Name	CHICAGO MORTGAGE SOLUTIONS CORP
Type	Mortgage Company
Address	DES PLAINES, IL 60018

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Sep 1, 2050

April 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	455 S 43RD ST, BOULDER, CO 80305-6007
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	AMERICAN TITLE INC

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003706992
Date	Apr 12, 2019
Instrument	3706992

Lender

Name	THIRD FSLA OF CLEVELAND
Type	Lending Institution
Address	CLEVELAND, OH 44105

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	359 Months
Due	Mar 19, 2049

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2017: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Apr 27, 2017
Property Address	455 S 43RD ST, BOULDER, CO 80305-6007
Document Number	0003589037
Instrument Date	Apr 26, 2017
Instrument	3589037
Transaction Type	Transfer
Record Updated	Mar 31, 2022
Title Company	HERITAGE TITLE CO

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$62.40
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name
Address	00000

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	455 S 43RD ST, BOULDER, CO 80305-6007

Mortgage

Document Number	0003589038
Date	Apr 27, 2017
Instrument	3589038

Lender

Name	DSW MORTGAGE INC
Type	Mortgage Company

Agreement

Type	ARM
Amount	Amount on Record
Term	361 Months
Due	May 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	3.62%
Type Change Date	May 1, 2024
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	8.62%
Index	1-Year LIBOR
Max Rate	8.62%

Tax Assessment & Valuation

Source: Boulder County assessment roll, as of September 18, 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		$49,830 (-0.69%) Land $32,837 Building $16,993	$802,800 (-) Land $552,900 Building $249,900
2025	$4,784.00 (+2.31%)	$50,175 (-13.25%) Land $34,556 Building $15,619	$802,800 (-7.01%) Land $552,900 Building $249,900
2023	$4,676.00 (+11.33%)	$57,841 (+27.86%) Land $40,495 Building $17,346	$863,300 (+32.63%) Land $604,400 Building $258,900
2022	$4,200.00	$45,238 Land $30,038 Building $15,200	$650,900 Land $432,200 Building $218,700

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
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	6 in force
Nearby Flood Claims	7 (1979–2022)
Claims Outside the SFHA	5 of 7
Most Recent Claim	Jul 2022 · rainfall accumulation
Claims by Event	Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 5 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	Low lower than 80% of the US · lower than 91% of Colorado
Wildfire Likelihood	0.01% annual chance
Exposure	None beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

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 678 locations within half a mile, as of December 31, 2025

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

May also be available: AT&T.

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