Leases don't have to be in writing. But if a lease is written, it must include the name and address where the landlord will notify the tenant of changes to the lease. The lease must tell tenants they must give the landlord a forwarding address in writing where they can be reached within four days after moving out.
It's not necessary. Typically, one of the parties may request to have the document signed and notarized, but it's not required by Michigan laws.
No. Michigan Lease Agreements do not need to be notarized. The Rental Contract is legally binding as long as it's signed by both the Landlord, or the lessor, and the Tenant, or the lessee.