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

Boulder County property record for 545 S 43rd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.25 ba · 2,373 sqft · built 1959
Lot Size	0.167 acres (7,277 sqft)
Owner	2 Individual Names on File
Last Sale	$712,000 (Feb 2020)
Tax Bill	$6,005 (2025)
Deeds & Mortgages	Aug 2023 Line of Credit Oct 2017 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`1577-08-1-05-032`

Property Details

APN / Parcel Number

Primary APN	`1577-08-1-05-032`
Alternative APNs	`R0010630` `0010630`

Interior

Bedrooms	4 Beds
Full Baths	2.25 Baths
Half Baths	2 Half Baths
Total Rooms	10 Rooms
Stories	1 Story
Building Area	2,373 sqft Living Area
Gross Area	2,484 sqft
1st Floor Area	1,377 sqft
Basement Area	1,107 sqft
Finished Basement	996 sqft
Unfinished Basement	111 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1959
Effective Year Built	Effective 1995
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Lot Area	7,277 sqft (0.167 acres)
Garage Type	Attached
Garage Area	264 sqft
Parking Spaces	1 Parking Space
Porch	Porch
Porch Area	80 sqft
Patio Area	190 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0010630
Street Address	545 S 43RD ST
City	BOULDER
State	CO
Zip	80305-6009
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 32 BLK 5 MARTIN ACRES 3
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	MARTIN ACRES 3 - BO
Legal Block	5
Legal Lot Number	32
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3003
Census Tract	12508

Owner

545 S 43rd St is owned and occupied by two individuals who bought it in February 2020.

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

Owner of Record	2 Individual Names on File
Mailing Address	545 S 43RD ST, BOULDER, CO 80305-6009
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

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

Deeds, Mortgages & Sale History

Date	Document
Aug 22, 2023	Deed of Trust, Mortgage · Line of Credit ZB NA
Oct 6, 2017	Deed of Trust, Mortgage · Conventional Mortgage MEGASTAR FINANCIAL CORP
Oct 22, 2020	Deed of Trust, Mortgage · Conventional Mortgage CHERRY CREEK MORTGAGE CO INC
Feb 13, 2020	Warranty Deed, Transfer · Conventional Mortgage CHERRY CREEK MORTGAGE CO INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Feb 13, 2020 · Amount on File
Deed Sale	Feb 13, 2020 · Amount on File
Prior Sale	Jan 8, 1996 · Amount on File
Deed Document Number	20203766009
Prior Transfer Date	Oct 6, 2008
Prior Transfer Doc	0002959804
Record Updated	Oct 29, 2026

August 2023: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	545 S 43RD ST, BOULDER, CO 80305-6009
Transaction Type	Mortgage
Record Updated	Sep 20, 2023

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	545 S 43RD ST, BOULDER, CO 80305-6009

Mortgage

Document Number	0004019130
Date	Aug 22, 2023
Instrument	4019130

Lender

Name	ZB NA
Type	Bank
Address	BOULDER, CO 80302

Agreement

Type	Line of Credit
Amount	Amount on Record

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

October 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	545 S 43RD ST, BOULDER, CO 80305-6009
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003618819
Date	Oct 6, 2017
Instrument	3618819

Lender

Name	MEGASTAR FINANCIAL CORP
Type	Funding / Finance Company
Address	DENVER, CO 80204

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Nov 1, 2047

October 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	545 S 43RD ST, BOULDER, CO 80305-6009
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003826577
Date	Oct 22, 2020
Instrument	3826577

Lender

Name	CHERRY CREEK MORTGAGE CO INC
Type	Mortgage Company
Address	ENGLEWOOD, CO 80111

Agreement

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

February 2020: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Feb 13, 2020
Property Address	545 S 43RD ST, BOULDER, CO 80305-6009
Document Number	0003766009
Instrument Date	Feb 11, 2020
Instrument	3766009
Transaction Type	Transfer
Record Updated	Mar 31, 2022
Title Company	FIDELITY NATIONAL TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$71.20
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	545 S 43RD ST, BOULDER, CO 80305-6009

Mortgage

Document Number	0003766010
Date	Feb 13, 2020
Instrument	3766010

Lender

Name	CHERRY CREEK MORTGAGE CO INC
Type	Mortgage Company

Agreement

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

Mortgage

Document Number	0003766011
Date	Feb 13, 2020
Instrument	3766011

Lender

Name	CONNEXUS CU
Type	Credit Union
Address	WAUSAU, WI 54401

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	120 Months
Due	Feb 12, 2030

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

Tax Assessment & Valuation

The 2025 property tax bill for 545 S 43rd St was $6,005.

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		$62,846 (+1.14%) Land $27,867 Building $34,979	$994,200 (-) Land $479,800 Building $514,400
2025	$6,005.00	$62,138 Land $29,988 Building $32,150	$994,200 Land $479,800 Building $514,400
2023	$5,800.00 (+16.49%)	$70,852 (+32.14%) Land $35,436 Building $35,416	$1,057,500 (+37.07%) Land $528,900 Building $528,600
2022	$4,979.00	$53,619 Land $26,382 Building $27,237	$771,500 Land $379,600 Building $391,900

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

FEMA maps place 545 S 43rd St in Zone X, an area of minimal flood risk.

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

Wildfire risk around 545 S 43rd St is low, with a 0.04% annual chance of 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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