If he does not vacate, your recourse then is to post a violation notice (unauthorized occupancy) and then file an eviction to remove the person.  

The CDC Covid restriction says you can't evict for non-payment of rent, it doesn't prevent you from evicting for other violations of the lease or for not having a valid lease. - Check local laws, I'm not a lawyer. 2.

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Also take the time to find some more distressed lists like tax lien, probate, code violation etc.

I would also imagine that this could be an issue (if there is a law on their books), and an investor was self-servicing (and in violation of TILA etc.) or brokering notes. 

I was able to execute a few other evictions due to illegal activities, ongoing damage to property, and significant lease violations.

HUD violations are serious and will make you insurance issue look like nothing.   

You can use the Easy Permit Process for the following project types:Inside the BuildingDrywall Replacement (greater than 1,000 square feet)Exterior Doors*Fire Damage (buildings with 24% damage or less, require demolition inspection approval and a separate electrical permit)Furnaces (replacement of existing gas-fired only in all commerical buildings and residential buildings with 4 or more dwelling units)*Existing Plumbing Fixture ReplacementElectrical Work (requires an electrical contractor)**Counter Top and Cabinet Replacement (required for condos only)Outside the BuildingDoors/Window Replacement (4 dwelling units or more, if same size, same location)*Fences (non-masonry fences greater than 5 ft. in height or masonry walls of any height)*Sheds greater than 150 square feetDetached frame garages, up to 600 square feet in area, without rooftop deck*Trash enclosure (wood only)Porch repair (if a violation report says permit for repairs only)Masonry work (mason contractor required)Tuckpointing (mason contractor required, masonry cleaning and grinding require a pollution prevention permit from CDPH)Roofs (If adding a layer, a general contractor or primary owner can perform the work)*Roofs (If total tear-off, must employ Illinois-licensed roofing contractor)Lintel repairs (6’-0” opening maximum, mason contractor required)Scaffolding (an easy permit can be received the same day if the work over the public way has been approved by the Chicago Department of Transportation) * For this project type in an all-residential building, the easy permit may be obtained online.** Electrical permits may be obtained online by licensed electrical contractors only.

A solution would be to go and inspect the unit and find something that is a lease violation. 

@Tracy Opoku Before you get a contractor out to the property when you're doing a 203k, the HUD approved FHA 203k Consultant needs to develop the scope of work and cost estimate for FHA 203k loans based on what the buyer wants done + the FHA violations they find during their inspection.