An Illinois sublease agreement allows a current tenant to rent out (or sublet) their leased property to another tenant (or subtenant). A sublease can cover just one room of a rented property or the entire property. Although the subtenant is subject to the same terms and conditions of the original lease agreement, the actual tenant is still responsible for property damage or breaches of the lease agreement by the subtenant.
If a lease doesn’t mention subletting or explicitly permits it, the tenant is free to enter a sublease agreement without further permission from their landlord. On the other hand, if the lease states that landlord permission is required (or expressly bans subletting), the tenant will breach their original lease if they enter a sublease agreement without the landlord’s consent.