Proviso 2020

Reassessment notices for properties in Proviso were mailed to property owners on August 31, 2020. Property valuations in Proviso have been adjusted, when appropriate, with a COVID-19 Adjustment based on our Office's estimates of economic effects of COVID-19. 

Note: Due to a processing error, some single-family home parcels did not receive the COVID Adjustment calculated for homes in their neighborhood. The Assessor’s Office will correct this processing error automatically. Affected taxpayers do not need to take any action. Read more here (Español).

For details on Proviso’s real estate market and reassessments, read the full reports below.


Residential Report:

Property type Property count Median 2019 Sale Price Median COVID Adjustment Median 2020 CCAO Estimated Fair Market Value Median change in 2017-2020 CCAO Estimated Fair Market Value
Single-family homes 37,650 $215,000 -10.1% $204,030 21.4%
Condos (class 2-99) 4,097 $130,000 -10.1% $91,120 15.4%
Apartments of 2-6 units 4,142 $275,450 -12.6% $267,570 13%


Read the full 2020 Proviso Residential Reassessment Report for more real estate data, COVID-19 adjustments, and reassessment data for each neighborhood.


Interactive Map:

Proviso map

Find your neighborhood, and data about single-family homes in Proviso, on the interactive map.

  • number of homes and most common type of single-family homes in each neighborhood
  • sale data for each neighborhood
  • assessment data for each neighborhood
  • note: to see COVID-19 Adjustments for each neighborhood, please read the full Proviso report.
    • For more details on how COVID-19 Adjustments were calculated, see our report.


Commercial Report:

  • 637 apartment buildings
  • 320 office buildings
  • 1,333 commercial/retail buildings
  • 679 industrial buildings

Commercial and multi-family (apartments) have seen stable growth over the last three years due to a low interest rate environment, increasing rental rates, and capitalization rate compression. Additionally, demand for large industrial parcels has contributed to an overall growth in industrial properties.

Read the full 2020 Proviso Commercial Reassessment Report for more real estate and assessment data about initial estimates of commercial property values.  


Events for Proviso Homeowners

The Assessor's Office staff host virtual events with the public to provide information and answer your questions about reassessments and appeals. See the full list.



If you are looking to file an appeal of your property's assessment, we encourage you to file online. The appeal deadline for Proviso is October 5, 2020.

For assistance, you can contact the CCAO's main office, or the office of Proviso Township Assessor Zawaski.