Mich. Comp. Laws § 559.156a

Sec. 56a. A developer or association of co-owners shall not prohibit a co-owner from displaying a single United States flag of a size not greater than 3 feet by 5 feet anywhere on the exterior of the co-owner's condominium unit. A developer or association of co-owners shall not enforce a prohibition in existence before the effective date of this section on or after that effective date.