If it were mine, Loud boy one warning--then non-renew--or boot out.Car issue, number the spots and assign them in the leases with a parking sticker with the spot number on it.Staple a duplicate numbered parking sticker to the lease in case you ever need it in court--vs peeling the one of the renters car.Possibly do an addendum for this to the lease if need be.Post warning signs according to local law and set up with a towing service.Car issue with no sticker parking there, have resident have service tow it--according to local law.No need to get involved in the car issue then. 

They have every right to be there and if you go to court you will get your behind handed to you. 

@James Devoe  Yes one should always proceed with caution when the seller is in a hurry. 

At what point do I notify him of the late fee and or consider eviction proceedings?

That being said if you already have a property picked out to roll the proceeds into there is an option called a reverse 1031 exchange.

From paperwork, to what contingencies (if any), and how to proceed in general once you have found a seller and an agreed upon price.

I recently sold a rental property and would like to try and defer all or part of the proceeds. i dont want to exchange into another self managed property...would like to take a break from landlordingthank you

You may or may not be able to evict her but getting her into the court system may make her realize she needs to step up. 

Crazy things are happening in court today to say the least. 

We're planning on using our proceeds to use an FHA 203k loan which we can use to buy a 2-4 unit in poor condition that we can do a live and flip, plus househack.