Assessor's Office

Business Personal Property

Senior Tax Exemption

    The Colorado Constitution establishes a property tax exemption for qualifying senior citizens, surviving spouses of senior citizens who previously qualified, and for disabled veterans.


    • Qualifying seniors were born on or before January 1, 1952, and
    • Lived in the home continuously starting before January 1, 2007.
    • Owned the home continuously starting before January 1, 2007.

    Effect on Taxes

    • The exemption goes into effect for tax year 2017.
    • The discount will first appear on the tax bill sent in January 2018.
    • The exemption remains in effect until a disqualifying event occurs.

    Deadline: Applications must be filed no later than July 15 to have the exemption apply to your tax bill the following year.

Property Information & Mapping

    New online Property Search tool:

  • Works on most mobile devices.
  • Can be used with more web browsers.
  • Makes looking up property information easier.
  • Provides access to more property information.
  • Makes appealing property values online easier.

Recent Sales

  • Recent Sales Activity—lists of sales for specified time frames. These lists are not intended to be used for real property assessment appeals.

Ask a Question about Your Property

Information Collection

The Assessor’s Office gathers and maintains information on properties, including:

  • Ownership
  • Location
  • Use
  • Sales
  • Building measurements
  • Construction type
  • Construction costs
  • Rental income, if applicable

Sources for this information are:

  • Real property deeds and declarations
  • Subdivision maps
  • Building permits
  • Local building contractors
  • Property owners
  • Declarations filed by owners of taxable personal property
  • Onsite inspections by staff

Learn more about:

Assessor Logo

Cynthia Braddock, Assessor

Cynthia Braddock

Meet the Assessor

Valuing Property

The Assessor’s Office establishes values every two years for more than 120,000 properties, worth nearly $50 billion in market value. The agency uses tools such as geographic information systems (GIS) and mass appraisal techniques to perform appraisal analysis.

The Assessor discovers and lists information about properties and uses this information to determine property values.

Property Assessment Overview

How Property Taxes Are Calculated

 Related Links

Protect your home and help combat property fraud with FraudSleuth



Main: 303-441-3530
Alternate: 303-441-4830
Fax: 303-441-4996
Business Personal Property
Main: 303-441-3316
Fax: 303-441-1783
Mailing Address
Main: PO Box 471
Boulder, CO 80306-0471


1325 Pearl St., 2nd floor
Boulder, CO 80302
Map & Directions
Hours: 8 a.m.-4:30 p.m. M-F


515 Coffman Street, Suite 114
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Hours: 8 a.m.-4:30 p.m.
Mondays ONLY


1376 Miners Dr., Unit 105
Map & Directions
Hours: 8 a.m.-4:30 p.m.
Tuesdays ONLY