355 S 42nd St, Boulder, CO 80305 Property Records

Boulder County property record for 355 S 42nd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	5 bd · 1.75 ba · 2,565 sqft · built 1957
Lot Size	0.178 acres (7,751 sqft)
Owner	Company Name on Record
Last Sale	$760,000 (Apr 2021)
Tax Bill	$5,563 (2025)
Deeds & Mortgages	Apr 2021 Sale & Mortgage Sep 2018 Reverse Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`1577-05-4-24-028`

Property Details

APN / Parcel Number

Primary APN	`1577-05-4-24-028`
Alternative APNs	`R0011609` `0011609`

Interior

Bedrooms	5 Beds
Full Baths	1.75 Baths
Half Baths	1 Half Bath
Total Rooms	8 Rooms
Stories	1 Story
Building Area	2,565 sqft Living Area
Gross Area	2,700 sqft
1st Floor Area	1,350 sqft
Basement Area	1,350 sqft
Finished Basement	1,215 sqft
Unfinished Basement	135 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1957
Effective Year Built	Effective 1982
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	7,751 sqft (0.178 acres)
Garage Type	Attached
Garage Area	200 sqft
Parking Spaces	1 Parking Space

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0011609
Street Address	355 S 42ND ST
City	BOULDER
State	CO
Zip	80305-5453
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 28 BLK 7 MARTIN ACRES 2
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	MARTIN ACRES 2 - BO
Legal Block	7
Legal Lot Number	28
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	3
Census Block	3008
Census Tract	12507

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	Company Name on Record
Mailing Address	2179 KINCAID PL, BOULDER, CO 80304-1900
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Date	Document
Apr 5, 2021	Special Warranty Deed, Transfer · Conventional Mortgage SWBC MORTGAGE CORP
Sep 4, 2018	Deed of Trust, Mortgage · Reverse Mortgage GOLDWATER BANK NA
Jul 18, 2018	Quit Claim Deed, Transfer Quitclaim

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Apr 5, 2021 · Amount on Record
Deed Sale	Apr 5, 2021 · Amount on Record
Deed Document Number	20213873856
Prior Transfer Date	Jun 25, 2018
Prior Transfer Doc	0003666429
Record Updated	Oct 29, 2026

April 2021: Special Warranty Deed, Transfer

Document Type	Special Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Apr 5, 2021
Property Address	355 S 42ND ST, BOULDER, CO 80305-5453
Document Number	0003873856
Instrument Date	Mar 12, 2021
Instrument	3873856
Transaction Type	Transfer
Record Updated	Mar 31, 2022
Title Company	FIDELITY NATIONAL TITLE

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$76.00
Amount Accuracy	Full Amount Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2179 KINCAID PL, BOULDER, CO 80304-1900

Mortgage

Document Number	0003873857
Date	Apr 5, 2021
Instrument	3873857

Lender

Name	SWBC MORTGAGE CORP
Type	Mortgage Company
Address	SAN ANTONIO, TX 78216

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Apr 1, 2051

September 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	355 S 42ND ST, BOULDER, CO 80305-5453
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003674526
Date	Sep 4, 2018
Instrument	3674526

Lender

Name	GOLDWATER BANK NA
Type	Bank
Address	PHOENIX, AZ 85016

Agreement

Type	Reverse Mortgage
Amount	Amount Recorded
Term	807 Months
Due	Dec 18, 2085

July 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	BOULDER CO
Recording Date	Jul 18, 2018
Property Address	355 S 42ND ST, BOULDER, CO 80305-5453
Document Number	0003666429
Instrument Date	Jun 25, 2018
Instrument	3666429
Transaction Type	Transfer
Record Updated	Jul 25, 2018

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	355 S 42ND ST BOULDER CO 803055453, BOULDER, CO 80305-5453

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		$57,800 (+0.52%) Land $34,741 Building $23,059	$920,000 (-) Land $580,900 Building $339,100
2025	$5,563.00 (+1.87%)	$57,500 (-12.96%) Land $36,306 Building $21,194	$920,000 (-6.69%) Land $580,900 Building $339,100
2023	$5,461.00 (+10.1%)	$66,062 (+25.58%) Land $42,538 Building $23,524	$986,000 (+30.27%) Land $634,900 Building $351,100
2022	$4,960.00	$52,605 Land $31,553 Building $21,052	$756,900 Land $454,000 Building $302,900

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	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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