No, in Illinois a landlord generally can’t evict a tenant “for no reason” during the term of a lease agreement; they must have a lawful ground (like nonpayment of rent, a lease violation, or other cause) and follow the required notice and court process.
If there’s no written lease or a written lease has expired and is not renewed, the landlord doesn’t need to give a separate reason to end the tenancy. After a lease ends or with a month-to-month tenancy, a landlord may terminate the tenancy with the appropriate written notice (e.g., generally 30 days) and then pursue eviction if the tenant doesn’t vacate.
Read this handy guide on Illinois eviction laws.
The information for this answer was found on our Illinois Eviction Process answers.