It seems likely that the notice is either a Notice of Foreclosure or a Notice to Quit Tenancy. Read the Notice carefully, any notice that is required under Michigan law should clearly state the purpose of such notice. Regarding Foreclosure, under MIchigan Law a mortgage holder foreclosing on a mortgage must post the Notice of Foreclosure on the property and by publishing the Notice in a county newspaper for 4 weeks. If this is the notice that is on the door it means a mortgage holder is holding the owner of the home in default and is ordering the sale of the home.
If it is a notice to Quit Tenancy, this could mean that the home has already been foreclosed on, and the redemption period (time after foreclosure in which the owner can redeem the property for the amount it owes the mortgage holder) has expired. After redemption a bank owns all interest in the property will typically file a notice to evict any holdover tenants - this would presumably include you, unless you have arrangements with the owner.
Your issue raises a lot of questions, I would advise you to carefully review the notice, and then seek a lawyer to discuss further.