I would think it does because they terminated their tenancy and now are squatting. 

So currently the neighbors grey water mostly goes in my driveway, and there appears to be what used to be a toilet that might be leaking sewage in the basement.The floor drains have collection of water.   

Creating a consistent theme for the entire house… farmhouseNew drywall and paint interior and exteriorFixing the bamboo hardwood floorsChanging out the light fixtures interior and exteriorPainting and restoring the bathroom vanities Tile paint for the bathroom floors and showersLandscapingChanging out the toilets to eco friendly ones Adding a nest thermostatSealing and patching parts of the roof Drywalling and painting the garage Adding new appliances Staging What was the outcome?

Switching out a toilet, no you dont need a permit (imo).

Hipsters love the ugly old toilets apparently, funkier the color the better.  

While you do not have to deal with the tenants, toilets and termites - it is not 100% passive as some make it out to be, so just be aware of that going in.

I did it as a very experienced GC and still lost money one time.If you still want to start off flipping, then go with an easy one.....just needs flooring /paint/appliances/toilets/etc......

I never hear complaints, or have toilets to unplug, snakes to remove or ants to kill.I've put together a spreadsheet that shows how all of this works.

When I purchase a new rental, I always change out the valves for the toilets and faucets with upgraded valves that are less likely to fail.

New LVP flooring upstairs to replace all the carpet, new cabinets and countertops in the 2.5 bathrooms, new fiberglass shower in the guest bathroom, new walk in shower (tiled) in the master bathroom, next lights/sinks/faucets/toilets/etc in all bathrooms, new paint on kitchen cabinets, new pulls on kitchen cabinets, new ceiling fans throughout, and fresh paint throughout.