(A) Abandonment and Other Causes. A vacancy occurs in an office by reason of abandonment of office; removal from office; or failure to qualify; or more than temporary removal of residence from the Municipality, as the case may be. The corporate authorities have the authority to determine whether a vacancy under this Section has occurred. If the corporate authorities determine that a vacancy exists, the office is deemed vacant as of the date of that determination for all purposes including the calculation under Sections 1-2-42 or 1-2-43.
(B) Guilty of a Criminal Offense. An admission of guilt of a criminal offense that upon conviction would disqualify the municipal officer from holding the office, in the form of a written agreement with State or federal prosecutors to plead guilty to a felony, bribery, perjury, or other infamous crime under State or federal law, constitutes a resignation from that office, effective on the date the plea agreement is made. For purposes of this Section, a conviction for an offense that disqualifies a municipal officer from holding that office occurs on the date of the return of a guilty verdict or, in the case of a trial by the court, on the entry of a finding of guilt.
(C) Election Declared Void. A vacancy occurs on the date of the decision of a competent tribunal declaring the election of the officer void.