Illinois SB 3678: BAN PRICE COORDINATION-RENT

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104TH GENERAL ASSEMBLY 
State of Illinois 
2025 and 2026
SB3678

Introduced 2/5/2026, by Sen. Mike Simmons 

SYNOPSIS AS INTRODUCED:

765 ILCS 705/35 new

815 ILCS 505/2MMMM new

 Amends the Landlord and Tenant Act. Prohibits a person from entering into an agreement with any other person to not compete in rental pricing, fees, or any other rental term for residential rental units in the State. Prohibits a person from engaging in price coordination for residential rental units in the State. Prohibits a person from facilitating an agreement between 2 or more persons to not compete with respect to rental pricing, fees, or any other rental term for residential rental units in the State. Prohibits a person from using, subscribing to, contracting for, or paying for the services involving price coordination or otherwise encouraging or facilitating an agreement with other persons to not compete with respect to any rental term for residential rental units in the State. Allows an aggrieved person to bring a civil action seeking damages and makes a violation of the Act a violation of the Consumer Fraud and Deceptive Practices Act.

LRB104 18451 JRC 31893 b

A BILL FOR

SB3678LRB104 18451 JRC 31893 b

1 AN ACT concerning civil law.

2 Be it enacted by the People of the State of Illinois, 

3represented in the General Assembly:

4 Section 5. The Landlord and Tenant Act is amended by 

5adding Section 35 as follows:

6 (765 ILCS 705/35 new)

7 Sec. 35. Prohibition on use of rent-setting algorithms.

8 (a) As used in this Section:

9 "Nonpublic competitor information" means information that 

10is not available to the general public, including information 

11about actual rent prices, occupancy rates, lease start-and-end 

12dates, and similar dat