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                $properties = CIBlockProperty::GetList(
                Array("sort"=>"asc", "name"=>"asc"),
                Array("ACTIVE"=>"Y", "CODE"=>$work_Prop_CODE)    // $work_Prop_CODE - здесь символьный код свойства
                );
                    while ($prop_fields = $properties->GetNext())
                    {
                        echo $prop_fields["IBLOCK_ID"]." - ID инфоблока<br>";
                    }

Array("CODE"=>$work_Prop_CODE, "ACTIVE"=>"Y")