IL SB3771

Prohibits landlords from terminating tenancies without "just cause" after a tenant has continuously occupied a property for 12 months; just cause includes non-payment of rent, lease violations, criminal activity, owner move-in, property withdrawal from rental market, or substantial remodeling

Caps annual rent increases at 5% plus the regional Consumer Price Index change, or 10%, whichever is lower; limits rent increases to no more than 2 increments per 12-month period for the same tenant

Requires landlords to provide relocation assistance equal to one month's rent or waive the final month's rent when terminating a tenancy for "no-fault" reasons such as owner move-in or property demolition

Exempts certain properties from the Act, including housing built within the past 15 years, single-family owner-occupied residences, duplexes where the owner lives in one unit, affordable housing developments, and properties owned by individuals (not corporations or REITs)

Applies retroactively to rent increases occurring on or after March 15, 2020, with the Act set to automatically repeal on January 1, 2031; requires the Commission on Government Forecasting and Accountability to report on the Act's effectiveness before repeal