The question of first impression for the Illinois Appellate Court in a case where Phillip McArdle sued Tad Christensen as trustee of two trusts for failing to close on a real estate contract — and McArdle had summons served at the southwest suburban Orland Park house that was listed as the location of the trusts on two checks that provided earnest money for the deal — was whether a deputy sheriff accomplished substitute service by handing the summons to an occupant of the Orland Park dwelling, even though …