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

Boulder County property record for 320 S 42nd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	3 bd · 1.5 ba · 1,372 sqft · built 1956
Lot Size	0.164 acres (7,158 sqft)
Owner	2 Company Names on Record
Last Sale	$540,000 (May 2014)
Tax Bill	$5,241 (2025)
Deeds & Mortgages	Jan 2024 Sale Mar 2017 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`1577-05-4-25-002`

Property Details

APN / Parcel Number

Primary APN	`1577-05-4-25-002`
Alternative APNs	`R0010557` `0010557`

Interior

Bedrooms	3 Beds
Full Baths	1.5 Baths
Half Baths	1 Half Bath
Total Rooms	6 Rooms
Stories	1 Story
Building Area	1,372 sqft Living Area
1st Floor Area	1,372 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1956
Effective Year Built	Effective 2000
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Roof Material	Asphalt
Lot Area	7,158 sqft (0.164 acres)
Garage Type	Detached
Garage Area	480 sqft
Parking Spaces	2 Parking Spaces
Porch	Porch
Porch Area	136 sqft
Deck Area	120 sqft

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0010557
Street Address	320 S 42ND ST
City	BOULDER
State	CO
Zip	80305-5454
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 2 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	2
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 shown locked on this page are available instantly with a free trial.

Owner of Record	2 Company Names on Record
Mailing Address	320 S 42ND ST, BOULDER, CO 80305-5454
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Jan 29, 2024	Special Warranty Deed, Transfer
Mar 20, 2017	Deed of Trust, Mortgage · Commercial Mortgage UMB BANK NA
Apr 27, 2020	Deed of Trust, Mortgage · Conventional Mortgage SWBC MORTGAGE CORP

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 20, 2014 · Amount on Record
Deed Sale	May 20, 2014 · Amount on Record
Prior Sale	Sep 21, 2007 · Amount on Record
Deed Document Number	20143381079
Prior Transfer Date	Nov 14, 2002
Prior Transfer Doc	0002365880
Record Updated	Oct 29, 2026

January 2024: Special Warranty Deed, Transfer

Document Type	Special Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Jan 29, 2024
Property Address	320 S 42ND ST, BOULDER, CO 80305-5454
Document Number	0004035022
Instrument Date	Jan 22, 2024
Instrument	4035022
Transaction Type	Transfer
Record Updated	Feb 13, 2024

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	320 S 42ND ST, BOULDER, CO 80305-5454

March 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	320 S 42ND ST, BOULDER, CO 80305-5454
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003581184
Date	Mar 20, 2017
Instrument	3581184

Lender

Name	UMB BANK NA
Type	Bank
Address	DENVER, CO 80218

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Property Address	320 S 42ND ST, BOULDER, CO 80305-5454
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	CAPITAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0003779624
Date	Apr 27, 2020
Instrument	3779624

Lender

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

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	241 Months
Due	May 1, 2040

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		$61,853 (+1.02%) Land $33,198 Building $28,655	$979,600 (-) Land $558,200 Building $421,400
2025	$5,241.00 (-8.05%)	$61,226 (-12.15%) Land $34,888 Building $26,338	$979,600 (-5.83%) Land $558,200 Building $421,400
2023	$5,700.00 (+15.2%)	$69,693 (+30.79%) Land $40,883 Building $28,810	$1,040,200 (+35.67%) Land $610,200 Building $430,000
2022	$4,948.00	$53,286 Land $30,323 Building $22,963	$766,700 Land $436,300 Building $330,400

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	0.03% 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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