month to month tenants who don't pay

[Nicole S.]

I'm looking for some advice on how to handle month to month tenants that are behind on rent in Michigan.   I purchased a fourplex in late July and as a result inherited 4 tenants, each on a month to month agreement.  I have two tenants that have been late with the rent since I purchased the place.   It is the end of October and I have not recieved any rent for October.  I understand I can give them 30 days notice to vacate at anytime, but I'd like to keep them on board until early Jan-Feb at which time I could do some much needed upgrades/repairs.  

I assume it would be hard to fill two vacancies during the holidays/winter.  

The tenants seem to be taking care of the place, so I'm not worried about damage.  I am getting frustrated, tired of their excuses,  and tired of being taken advantage of.   

I'm looking for advice.  Should I give them 30days? or should I continue to extract some amount of rent from them until I am ready to remodel and put up for rent.?  Am I worrying too much about a filling the vacancy in the winter?