Legal Question in Real Estate Law in Michigan

If the "no pets" rule was not in effect when you signed your lease, it will be difficult for the landlord to enforce it against you now. However, when your lease expires, new restrictions may be placed on your tenancy. The landlord is permitted to charge whatever he wants for his property, unless there is some statutory "rent controls". There is no constitutional protection for pets, so landlords can exclude them or permit them only in certain buildings.