"TO A.B. You are hereby notified that in consequence of (here insert lessor-owner name) failure to comply with the leasing requirements prescribed by Section 18(n) of the Condominium Property Act or by the declaration, bylaws, and rules and regulations of the condominium, or your default of any covenants, rules, regulations or bylaws of the condominium, in (here insert the character of the default) of the premises now occupied by you, being (here described the premises) the Board of Managers of (here describe the condominium) Association elects to terminate your lease, and you are hereby notified to quit and vacate same within 10 days of this date.".
The demand shall be signed by the Board of Managers, its agent, or attorney and shall be served either personally upon the lessee with a copy to the unit owner or by sending the demand thereof by registered or certified mail with return receipt requested to the unit occupied by the lessee and to the last known address of the unit owner, and no other demand of termination of such tenancy shall be required. To be effective service under this Section, a demand sent by certified mail, return receipt requested, to the unit occupied by the lessee and to the last known address of the unit owner need not be received by the lessee or condominium unit owner.
735 ILCS 5/9-104.2