Ill. Admin. Code tit. 2, § 2260.310
a) Any request for public records should be submitted in writing, via mail, email, fax or hand delivery to the FOI Officer at the Agency's Chicago Office:
Illinois State Board of Investment
180 North LaSalle Street
Suite 2015
Chicago IL 60601
Attn: FOI Officer
Fax: 312/793-2266