(a) When any township or multi-township assessment district fails to elect an assessor or when an assessor’s office becomes vacant for any reason specified in § 25-2 of the Election Code, the township or multi-township board of trustees shall fill the vacancy in townships or multi-township assessment districts by appointing a person qualified as required under Section 2-45 or as revised by the Department under Section 2-52. A person appointed to fill a vacancy under this Section must be a member of the same political party as the person vacating the office if the person vacating the office was a member of an established political party, as defined in § 10-2 of the Election Code, that is still in existence at the time the appointment is made. The appointee shall establish his or her political party affiliation by his or her record of voting in party primary elections or by holding or having held an office in a political party organization before the appointment. If the appointee has not voted in a party primary election or is not holding or has not held an office in a political party organization before the appointment, then the appointee shall establish his or her political party affiliation by his or her record of participating in a political party’s nomination or election caucus.
     (b) In the alternative, a township or multi-township assessment district shall contract with a person qualified as required under Section 2-45 or as revised by the Department under Section 2-52 to do the assessing at a cost no greater than the maximum salary authorized for that township or multi-township assessment district under Section 2-70.