Section 765 ILCS 605/17 - Amendments to the declaration or bylaws(a) The administration of every property shall be governed by bylaws, which may either be embodied in the declaration or in a separate instrument, a true copy of which shall be appended to and recorded with the declaration. No modification or amendment of the declaration or bylaws shall be valid unless the same is set forth in an amendment thereof and such amendment is duly recorded. An amendment of the declaration or bylaws shall be deemed effective upon recordation unless the amendment sets forth a different effective date.(b) Unless otherwise provided by this Act, amendments to condominium instruments authorized to be recorded shall be executed and recorded by the president of the association or such other officer authorized by the board of managers.