Michigan Compiled Laws, Chapter 15. Public Officers and Employees § 15.324

(a) Contracts between public entities.

(b) Contracts awarded to the lowest qualified bidder, other than a public servant, upon receipt of sealed bids pursuant to a published notice. Except as authorized by law, the notice shall not bar any qualified person, firm, corporation, or trust from bidding. This subsection shall not apply to amendments or renegotiations of a contract nor to additional payments made under a contract which were not authorized by the contract at the time of award.

(c) Contracts for public utility services where the rates are regulated by the state or federal government.

(d) Contracts to purchase residential property. A public servant of a city or village may purchase 1 to 4 parcels not less than 18 months between each purchase. This subdivision does not apply to public servants of a city or village who have been appointed or elected to their position or whose employment responsibilities include the purchase or selling of property for the city or village. This subdivision shall apply only to a city or village that has adopted an ethics ordinance which was in effect at the time the residential property was purchased.