520 S 45th St, Boulder, CO 80305 Property Records

Boulder County property record for 520 S 45th St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	5 bd · 2.5 ba · 2,444 sqft · built 1958
Lot Size	0.169 acres (7,377 sqft)
Owner	2 Individual Names on File
Last Sale	$738,000 (Aug 2020)
Tax Bill	$5,739 (2025)
Deeds & Mortgages	May 2019 Mortgage Aug 2020 Sale & Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`1577-08-1-02-002`

Property Details

APN / Parcel Number

Primary APN	`1577-08-1-02-002`
Alternative APNs	`R0012608` `0012608`

Interior

Bedrooms	5 Beds
Full Baths	2.5 Baths
Half Baths	2 Half Baths
Total Rooms	10 Rooms
Stories	1 Story
Building Area	2,444 sqft Living Area
1st Floor Area	1,222 sqft
Basement Area	1,222 sqft
Finished Basement	1,222 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1958
Effective Year Built	Effective 1995
Architectural Style	Ranch
Exterior Material	Combination
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	7,377 sqft (0.169 acres)
Deck Area	340 sqft

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0012608
Street Address	520 S 45TH ST
City	BOULDER
State	CO
Zip	80305-6050
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 2 BLK 2 MARTIN ACRES 3
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	MARTIN ACRES 3 - BO
Legal Block	2
Legal Lot Number	2
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3000
Census Tract	12508

Owner

520 S 45th St is owned and occupied by two individuals who bought it in August 2020.

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	520 S 45TH ST, BOULDER, CO 80305-6050
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
May 28, 2019	Deed of Trust, Mortgage · Conventional Mortgage CMG MORTGAGE INC
Aug 19, 2020	Warranty Deed, Transfer · Conventional Mortgage ELEVATIONS CU
Nov 7, 2018	Quit Claim Deed, Transfer Quitclaim
Jun 7, 2018	Warranty Deed, Transfer · Conventional Mortgage CALIBER HM LOANS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Aug 19, 2020 · Amount on File
Deed Sale	Aug 19, 2020 · Amount on File
Prior Sale	Jun 7, 2018 · Amount on File
Deed Document Number	20203807775
Prior Transfer Date	Oct 15, 2018
Prior Transfer Doc	0003684746
Record Updated	Oct 29, 2026

May 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	520 S 45TH ST, BOULDER, CO 80305-6050
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003714321
Date	May 28, 2019
Instrument	3714321

Lender

Name	CMG MORTGAGE INC
Type	Mortgage Company
Address	SAN RAMON, CA 94583

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Jun 1, 2049

August 2020: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Aug 19, 2020
Property Address	520 S 45TH ST, BOULDER, CO 80305-6050
Document Number	0003807775
Instrument Date	Aug 14, 2020
Instrument	3807775
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	$73.80
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	520 S 45TH ST, BOULDER, CO 80305-6050

Mortgage

Document Number	0003807776
Date	Aug 19, 2020
Instrument	3807776

Lender

Name	ELEVATIONS CU
Type	Credit Union

Agreement

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

November 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	BOULDER CO
Recording Date	Nov 7, 2018
Property Address	520 S 45TH ST, BOULDER, CO 80305-6050
Document Number	0003684746
Instrument Date	Oct 15, 2018
Instrument	3684746
Transaction Type	Transfer
Record Updated	Nov 16, 2018

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	520 S 45TH ST BOULDER CO 803056050, BOULDER, CO 80305-6050

June 2018: Warranty Deed, Transfer

Document Type	Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Jun 7, 2018
Property Address	520 S 45TH ST, BOULDER, CO 80305-6050
Document Number	0003659319
Instrument Date	May 31, 2018
Instrument	3659319
Transaction Type	Transfer
Record Updated	Jun 14, 2018
Title Company	FIRST AMERICAN TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$68.70
Amount Accuracy	Confirmed
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	520 S 45TH ST BOULDER CO 803056050, BOULDER, CO 80305-6050

Mortgage

Document Number	3659320
Date	Jun 7, 2018
Instrument	3659320

Lender

Name	CALIBER HM LOANS
Type	Funding / Finance Company
Address	IRYING, TX 75063

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Jun 6, 2048

Tax Assessment & Valuation

The 2025 property tax bill for 520 S 45th St was $5,739.

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		$59,813 (+0.78%) Land $28,091 Building $31,722	$949,600 (-) Land $483,100 Building $466,500
2025	$5,739.00	$59,350 Land $30,194 Building $29,156	$949,600 Land $483,100 Building $466,500
2023	$5,555.00 (+15.75%)	$68,012 (+31.58%) Land $35,678 Building $32,334	$1,015,100 (+36.49%) Land $532,500 Building $482,600
2022	$4,799.00	$51,687 Land $26,563 Building $25,124	$743,700 Land $382,200 Building $361,500

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 520 S 45th 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 520 S 45th 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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