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

Boulder County property record for 135 S 42nd St, Boulder, CO 80305

Property Summary

Property Type	Single Family Home
Details	3 bd · 2.25 ba · 2,103 sqft · built 1960
Lot Size	0.165 acres (7,180 sqft)
Owner	Individual Name on Record
Last Sale	$970,000 (Jun 2026)
Tax Bill	$4,685 (2025)
Deeds & Mortgages	Jun 2026 Sale & Mortgage Apr 2026 Line of Credit + 3 more
Flood Zone	Zone X (minimal risk)
APN	`1577-05-4-11-030`

Property Details

APN / Parcel Number

Primary APN	`1577-05-4-11-030`
Alternative APNs	`R0013735` `0013735`

Interior

Bedrooms	3 Beds
Full Baths	2.25 Baths
Half Baths	2 Half Baths
Total Rooms	5 Rooms
Stories	1 Story
Building Area	2,103 sqft Living Area
Gross Area	2,511 sqft
1st Floor Area	1,107 sqft
Basement Area	1,107 sqft
Finished Basement	996 sqft
Unfinished Basement	111 sqft
Interior Walls	Wallboard/Drywall

Exterior

Year Built	Built 1960
Effective Year Built	Effective 1990
Architectural Style	Ranch
Exterior Material	Brick Veneer
Construction Type	Masonry / Concrete Block
Lot Area	7,180 sqft (0.165 acres)
Garage Type	Attached
Garage Area	297 sqft
Parking Spaces	1 Parking Space
Patio Area	288 sqft

Utilities, Heating & Cooling

Heating System	Forced Air with A/C

Location & Zoning

Account Number	R0013735
Street Address	135 S 42ND ST
City	BOULDER
State	CO
Zip	80305-5536
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT 30 BLK 10 WILLIAM MARTIN HOMESTEAD
Legal Range	70
Legal Township	1S
Legal Section	05
Legal Subdivision	WILLIAM MARTIN HOMESTEAD - BO
Legal Block	10
Legal Lot Number	30
Jurisdiction	BOULDER CO
Township / Civil Division	BOULDER
Census Block Group	1
Census Block	1022
Census Tract	12507

Owner

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	Individual Name on Record
Mailing Address	135 S 42ND ST, BOULDER, CO 80305-5536
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Jun 4, 2026	Special Warranty Deed, Transfer · Conventional Mortgage GUARDIAN TITLE AGENCY
Apr 13, 2026	Deed of Trust, Mortgage · Line of Credit BANK OF COLORADO
Apr 13, 2026	Special Warranty Deed, Transfer · Line of Credit BANK OF COLORADO
Apr 13, 2026	Deed of Trust, Mortgage · Line of Credit BANK OF COLORADO
Mar 23, 2018	Quit Claim Deed, Transfer Quitclaim

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jun 4, 2026 · Amount on Record
Deed Sale	Jun 4, 2026 · Amount on Record
Prior Sale	Apr 13, 2026 · Amount on Record
Deed Document Number	20264134891
Prior Transfer Date	Mar 17, 2018
Prior Transfer Doc	0003646813
Record Updated	Oct 29, 2026

June 2026: Special Warranty Deed, Transfer

Document Type	Special Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Jun 4, 2026
Property Address	135 S 42ND ST, BOULDER, CO 80305-5536
Document Number	0004134891
Instrument Date	May 29, 2026
Instrument	20264134891
Transaction Type	Transfer
Record Updated	Jun 16, 2026
Title Company	GUARDIAN TITLE AGENCY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$9,797.00
Amount Accuracy	Calculated from Transfer Tax
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	135 S 42ND ST, BOULDER, CO 80305-5536

Mortgage

Document Number	0004134892,
Date	Jun 4, 2026
Instrument	20264134892

Lender

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Jun 1, 2056

Interest

Rate Type	Fixed Rate
Rate	6.23%
Initial Type	Fixed Rate
Max Rate	-1%

April 2026: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Recording Date	Apr 13, 2026
Property Address	135 S 42ND ST, BOULDER, CO 80305-5536
Document Number	0004127464
Instrument Date	Apr 10, 2026
Instrument	20264127464
Transaction Type	Mortgage
Record Updated	Jul 12, 2026
Title Company	NONE LISTED ON DOCUMENT

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Trust, 212
Address	1636 HEMLOCK WAY, BROOMFIELD, CO 80020-3428

Mortgage

Document Number	0004127464,
Date	Apr 13, 2026
Instrument	20264127464

Lender

Name	BANK OF COLORADO

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	120 Months
Due	Apr 10, 2036

Interest

Rate Type	Adjustable Rate
Rate	6.11%
Initial Type	Adjustable Rate
Adjustable	Adjustable Rate Rider
Max Rate	-1%

April 2026: Special Warranty Deed, Transfer

Document Type	Special Warranty Deed
Jurisdiction	BOULDER CO
Recording Date	Apr 13, 2026
Property Address	135 S 42ND ST, BOULDER, CO 80305-5536
Document Number	0004127461
Instrument Date	Apr 10, 2026
Instrument	2026.4127461
Transaction Type	Transfer
Record Updated	Apr 27, 2026
Title Company	LAND TITLE GUARANTEE

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$16,715.50
Amount Accuracy	Calculated from Transfer Tax
Additional	Arm's Length Multiple Parcels

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Limited Liability Partnership
Address	1636 HEMLOCK WAY, BROOMFIELD, CO 80020-3428

Mortgage

Document Number	0004127461,
Date	Apr 13, 2026
Instrument	2026.4127461

Lender

Name	BANK OF COLORADO

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	120 Months
Due	Apr 10, 2036

Interest

Rate Type	Adjustable Rate
Rate	6.11%
Initial Type	Adjustable Rate
Adjustable	Adjustable Rate Rider
Max Rate	-1%

April 2026: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	BOULDER CO
Recording Date	Apr 13, 2026
Property Address	135 S 42ND ST, BOULDER, CO 80305-5536
Document Number	0004127464
Instrument Date	Apr 10, 2026
Instrument	20264127464
Transaction Type	Mortgage
Record Updated	Aug 6, 2026
Title Company	NONE LISTED ON DOCUMENT

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Family Trust, 221
Address	1636 HEMLOCK WAY, BROOMFIELD, CO 80020-3428

Mortgage

Document Number	0004127464,
Date	Apr 13, 2026
Instrument	20264127464

Lender

Name	BANK OF COLORADO

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	120 Months
Due	Apr 10, 2036

Interest

Rate Type	Adjustable Rate
Rate	6.11%
Initial Type	Adjustable Rate
Adjustable	Adjustable Rate Rider
Max Rate	-1%

March 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	BOULDER CO
Recording Date	Mar 23, 2018
Property Address	135 S 42ND ST, BOULDER, CO 80305-5536
Document Number	0003646813
Instrument Date	Mar 17, 2018
Instrument	3646813
Transaction Type	Transfer
Record Updated	Apr 2, 2018

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Personal Trust
Address	1636 HEMLOCK WAY BROOMFIELD CO 800203428, BROOMFIELD, CO 80020-3428

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		$48,702 (-0.89%) Land $33,259 Building $15,443	$786,200 (-) Land $559,100 Building $227,100
2025	$4,685.00 (+1.78%)	$49,138 (-12.37%) Land $34,944 Building $14,194	$786,200 (-6.06%) Land $559,100 Building $227,100
2024	$4,603.00 (+1.75%)
2023	$4,524.00 (+11.02%)	$56,073 (+27.78%) Land $40,944 Building $15,129	$836,900 (+32.55%) Land $611,100 Building $225,800
2022	$4,075.00	$43,883 Land $30,372 Building $13,511	$631,400 Land $437,000 Building $194,400

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
Flood Insurance Cost	Premium on Record median of 25 policies
Community Rating System	Class 5 (25% premium discount)
Nearby Flood Policies	25 in force
Nearby Flood Claims	16 (1995–2013)
Claims Outside the SFHA	2 of 16
Most Recent Claim	Sep 2013 · Severe Storms, Flooding, Landslides, And Mudslides
Claims by Event	Severe Storms, Flooding, Landslides, And Mudslides, Sep 2013 · 14 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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