4th Ave, Niwot, CO Property Records

Boulder County property records for 7 addresses on 4th Ave, Niwot, CO · Last verified August 2026

4th Ave Highlights

Properties 7
Median Sale Price $472,500
Deeds and Mortgages on File 14
Median Price per Sqft $401
Owner Occupied 14%
Median Annual Tax Bill $5,997
Median Year Built 1978
Median Ownership Tenure 15 years

Properties on 4th Ave

Owner names and prior sale amounts shown locked below are available instantly with a free trial.

140 4th Ave

3 bd · 1 ba · 1,046 sqft · built 1964 · 0.234 acres

Last Sale Tax Bill Prior Sale Owner Records
$420,000Aug 2018 $5,0422025 Amount on Record Jun 2018 2 Names on Record Owner Occupied Assessor + 3 DocumentsUpdated Aug 2026

160 4th Ave

1 bd · 3.25 ba · 822 sqft · built 1910 · 0.216 acres

Last Sale Tax Bill Prior Sale Owner Records
$800,000Dec 2021 $5,1742025 —Jan 1985 1 Name on Record Assessor + 3 DocumentsUpdated Aug 2026

240 4th Ave

2 bd · 1.75 ba · 1,981 sqft · built 1903 · 0.301 acres

Last Sale Tax Bill Prior Sale Owner Records
$472,500Aug 2007 $5,9972025 —Jan 1989 2 Names on Record AssessorUpdated Jun 2026

243 4th Ave

2 bd · 2 ba · 1,160 sqft · built 1978 · 0.112 acres

Last Sale Tax Bill Prior Sale Owner Records
$481,000May 2019 $4,5682025 Amount on Record Sep 2012 2 Names on Record Assessor + 3 DocumentsUpdated Aug 2026

261 4th Ave

2 bd · 1.75 ba · 1,628 sqft · built 1986 · 0.342 acres

Last Sale Tax Bill Prior Sale Owner Records
$370,000Jun 2009 $6,0982025 Amount on Record Feb 2009 2 Names on Record Assessor + 2 DocumentsUpdated Jun 2026

295 4th Ave

3 bd · 2 ba · 1,968 sqft · built 1986 · 0.318 acres

Last Sale Tax Bill Prior Sale Owner Records
—Jun 1993 $6,1672025 Amount on Record Sep 1984 1 Name on Record AssessorUpdated Jun 2026

305 4th Ave

2 bd · 2.25 ba · 1,878 sqft · built 2012 · 0.418 acres

Last Sale Tax Bill Prior Sale Owner Records
$144,000Oct 2011 $6,6872025 —Apr 1991 2 Names on Record Assessor + 3 DocumentsUpdated Jun 2026

Property Records in Nearby Streets