Suffredin- Changing County Government  
 

Accountability
Forest Preserves
Public Safety
Cook County Budget
Forest Pres. Budget
Property Tax Appeal
Health & Hospitals
Land Bank Authority
Policy Resolutions
Unsung Heroine

 

   
 
   
   
 
   
     
  Office phone numbers:  
   
 
 

Search current and proposed Cook County Legislation in Larry's exclusive legislative library.

   
 

The Cook County Code of Ordinances are the current laws of Cook County.

   
  Cook County is the second most populous county in the nation. It is the 19th largest government in the U.S.
   
     
     
     



Assessor’s Office new residential property assessment model unveiled for Tax Year 2018 reassessment
Early indicators of accuracy meet industry standards and criteria for minimal regression

Wednesday, May 02, 2018
Special to suffredin.org

Chicago - Cook County Assessor Joseph Berrios has announced that the first reassessment

of residential properties using a new assessment model has met the longstanding goal of

reducing regression. This creates more accurate assessed values of homes.

The system for residential property assessment in Cook County has been in existence for 40

years. Assessor Berrios inherited that system and its issues. He and his staff pledged to work

with the Civic Consulting Alliance (CCA) and Tyler Technologies to improve residential

assessment modeling and related processes. Work with Tyler actually began years ago.

“Improving residential assessment has been a priority during my time in office. It pleases me

tremendously to see we are achieving what we set out to do, and new resources now

available to us from CCA and Tyler have helped. This is a huge step forward for Cook County,”

Assessor Berrios said.

The Assessor added, “I thank County Board President Toni Preckwinkle for her help with the

Tyler Technologies contract, CCA for its important role, CCA expert Josh Myers, Tyleraffiliated

expert Dr. Richard Borst and Tyler for its overall fine work. Everyone in the

Assessor’s Office worked diligently to meet the goal of improving the assessment process.”

The Assessor’s Office triennially reassesses one-third of the more than 1.8 million parcels of

property located in Cook County. In this tax year (2018), the reassessment is of all properties

in the City of Chicago.

Rogers Park Township, one of the eight townships comprising the City, is the first township

whose reassessment notices have been mailed. Approximately 11,000 parcels of residential

real estate were reassessed there using the new model. Numerous indicators including

coefficient of dispersion (COD) are well within industry standards of the International

Association of Assessing Officers (IAAO).

This most recent work reflects interactive collaboration between the Assessor’s Office and

newly available, renowned valuation and modeling experts and researchers at CCA and Tyler.

Due to the sophistication of these state-of-the art improvements in techniques, the model

performance was superior. Results include:

 

? Both linear additive and multiplicative (a/k/a log-linear) model structures were evaluated

in light of IAAO standards

? COD, coefficient of variation (COV), price-related differential (PRD) and pricerelated

bias (PRB) are all well within IAAO standards.

? The multiplicative model structure was chosen because of its superior performance

measures.

? Outlier identification was based on statistically-founded and defensible methods

? Geostatistical methods were used to derive a location influence factor intended to

improve model performance. The location factor variable was significant and helped to

improve accuracy.

? The valuation procedure used the comparable sales direct market comparison method

of valuation.

? Performance measures of accuracy ultimately obtained were superior to traditional

modeling techniques

? There has been a significant reduction in the number of necessary hand checks

? Geospatial analytic methods were employed to ensure that there was no spatial bias in

the valuation model. Model performance demonstrated a lack of spatial clustering.

“We have never wavered from our commitment to reducing regression and assessing property

as accurately and fairly as possible,” said Assessor Berrios.

Reassessment notices contain proposed property values for Tax Year 2018, which will be

reflected on Second-Installment Tax Bills to be mailed and due in the summer of 2019. Each

“Assessed Value” is 10% of a home’s estimated market value.



Recent Headlines

Preckwinkle, Evans end budget battle
Wednesday, July 18, 2018
Crain's Chicago Business

How Transparent and Accountable Are Chicago, Cook County Governments?
Wednesday, July 18, 2018
WTTW Chicago Tonight

2 Cook County courthouses to close, employees spared layoffs under budget settlement: officials
Wednesday, July 18, 2018
Chicago Tribune

Troubled detainee at center of unusual court fight between Loyola hospital, Cook County
Monday, July 16, 2018
Chicago Tribune

Cook County Commissioners Confounded by Hiring of Health System Consultant
Monday, July 16, 2018
WBEZ Chicago Public Radio

Doctor fired by Cook County medical examiner now under the microscope in Indiana
Sunday, July 15, 2018
Chicago Sun-Times

County officials defend Forest Preserves police in wake of man harassing woman over Puerto Rican flag shirt
Friday, July 13, 2018
Chicago Tribune

Familiar questions about ‘bystander effect’ arise after man berates woman for Puerto Rico shirt
Friday, July 13, 2018
Chicago Tribune

Berrios' analysts used Zillow, other shortcuts in assessing property values, documents show
Friday, July 13, 2018
Chicago Tribune

Northbrook to revisit Cook County paid sick leave policy after opting out last year
Friday, July 13, 2018
Chicago Tribune

Cook County Forest Preserves officials discuss officer's resignation
Friday, July 13, 2018
Chicago Tribune

Amid video fallout, Cook County Forest Preserve District reveals fatal crash involving worker and governmental truck
Friday, July 13, 2018
Chicago Tribune

Transformation in the outdoors
Friday, July 13, 2018
Special to suffredin.org

Forest preserve cop resigns after apparently failing to help woman being harassed over Puerto Rico shirt
Thursday, July 12, 2018
Chicago Tribune

5 things: A civics lesson on Puerto Rico after man rants about woman's flag T-shirt, questions citizenship
Thursday, July 12, 2018
Chicago Tribune

Cook County Commissioners: Get Rid of Forest Preserve Police
Thursday, July 12, 2018
WTTW Chicago Tonight

Schneider wants hearing over fatal crash blamed on Cook forest preserve driver
Thursday, July 12, 2018
Daily Herald

Man who harassed woman for Puerto Rican flag shirt charged with hate crime
Thursday, July 12, 2018
WLS ABC 7 Chicago

EDITORIAL: A judge drops a gun on a courthouse floor. So much for respect for the law
Thursday, July 12, 2018
Chicago Sun-Times

Forest preserve officer who didn't help woman in Puerto Rican flag shirt 'tarnished the whole department,' commissioner says
Thursday, July 12, 2018
Chicago Tribune

all news items

Paid for by Larry Suffredin and not at taxpayer expense. A Haymarket Production.
^ TOP