Serving notice/Abandonment of property

[Ashlee Fazio]

Hi all! 
I have a rental property with a tenant who is up to date on rent at this point. However, he has been demonstrating concerning behavior and I have been told he is currently in a mental health facility. I had been planning to serve a notice to end his lease at the end of September and am worried I will not be able to serve him as I have not been able to contact him in a few days. 

After going to the property to do planned repairs the apartment is a mess and looks abandoned. Old food left out, all cabinets opened, clothes emptied from the closet. Do you have any advice on service of the notice to vacate? And if I cannot contact him and do not receive rent on the 1st, what are my options for removing his property and work on getting the property rerented ?