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

Boulder County property record for 540 S 43rd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 1,980 sqft · built 1959
Lot Size	0.167 acres (7,277 sqft)
Owner	2 Individual Names on Record
Last Sale	$700,000 (Jul 2018)
Tax Bill	$5,741 (2025)
Deeds & Mortgages	Nov 2020 Mortgage Jul 2018 Sale & Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`1577-08-1-04-004`

Property Details

APN / Parcel Number

Primary APN	`1577-08-1-04-004`
Alternative APNs	`R0010928` `0010928`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	2 Half Baths
Total Rooms	8 Rooms
Stories	1 Story
Building Area	1,980 sqft Living Area
Gross Area	2,356 sqft
1st Floor Area	1,040 sqft
Basement Area	1,040 sqft
Finished Basement	940 sqft
Unfinished Basement	100 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1959
Effective Year Built	Effective 1995
Architectural Style	Ranch
Exterior Material	Wood Shingle
Construction Type	Frame
Lot Area	7,277 sqft (0.167 acres)
Garage Type	Attached
Garage Area	276 sqft
Parking Spaces	1 Parking Space
Patio Area	150 sqft

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0010928
Street Address	540 S 43RD ST
City	BOULDER
State	CO
Zip	80305-6010
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 4 BLK 4 MARTIN ACRES 3
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	MARTIN ACRES 3 - BO
Legal Block	4
Legal Lot Number	4
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3002
Census Tract	12508

Owner

Source: Boulder County records, as of September 18, 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 Record
Mailing Address	540 S 43RD ST, BOULDER, CO 80305-6010
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Nov 12, 2020	Deed of Trust, Mortgage · Conventional Mortgage FLAGSTAR BANK FSB
Jul 24, 2018	Warranty Deed, Transfer · Conventional Mortgage CHERRY CREEK MORTGAGE CO INC
Mar 5, 2018	Warranty Deed, Transfer GUARDIAN TITLE COMPANY

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jul 24, 2018 · Amount on Record
Deed Sale	Jul 24, 2018 · Amount on Record
Prior Sale	Mar 5, 2018 · Amount on Record
Deed Document Number	20183667350
Record Updated	Oct 29, 2026

November 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	540 S 43RD ST, BOULDER, CO 80305-6010
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	PORTAGE TITLE AGENCY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003832809
Date	Nov 12, 2020
Instrument	3832809

Lender

Name	FLAGSTAR BANK FSB
Type	Bank
Address	TROY, MI 48098

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Dec 1, 2035

July 2018: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Jul 24, 2018
Property Address	540 S 43RD ST, BOULDER, CO 80305-6010
Document Number	0003667350
Instrument Date	Jul 20, 2018
Instrument	3667350
Transaction Type	Transfer
Record Updated	Mar 31, 2022
Title Company	GUARDIAN TITLE

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$70.00
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	540S S 43RD ST, BOULDER, CO 80305-6010

Mortgage

Document Number	0003667351
Date	Jul 24, 2018
Instrument	3667351

Lender

Name	CHERRY CREEK MORTGAGE CO INC
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Aug 1, 2048

March 2018: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Mar 5, 2018
Property Address	540 S 43RD ST, BOULDER, CO 80305-6010
Document Number	0003643310
Instrument Date	Feb 28, 2018
Instrument	3643310
Transaction Type	Transfer
Record Updated	Mar 12, 2018
Title Company	GUARDIAN TITLE COMPANY

Transaction

Amount	Amount Recorded
Tax	$56.25
Amount Accuracy	Confirmed
Additional	Notice of Trustee Sale Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Company
Address	507 E EMMA ST LAFAYETTE CO 800262230, LAFAYETTE, CO 80026-2230

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		$60,758 (+0.9%) Land $27,866 Building $32,892	$963,500 (-) Land $479,800 Building $483,700
2025	$5,741.00 (+2.39%)	$60,219 (-12.24%) Land $29,988 Building $30,231	$963,500 (-5.92%) Land $479,800 Building $483,700
2023	$5,607.00 (+14.85%)	$68,614 (+30.5%) Land $35,436 Building $33,178	$1,024,100 (+35.37%) Land $528,900 Building $495,200
2022	$4,882.00	$52,577 Land $26,382 Building $26,195	$756,500 Land $379,600 Building $376,900

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	5 in force

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 67% of the US · lower than 84% of Colorado
Wildfire Likelihood	0.04% annual chance
Exposure	Indirect within 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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