Think about your alcohol, drug, and gun policies.The strength of the lease doesn't matter.  

Still lots of drug dealers and prostitutes in certain areas

It might have been used in mfg drugs or have someone murdered not disclosed.

Additionally, when they visited the park to talk to the owner, the owner pointed them out where the dealers lived.

You pay $25,000 for it, the moment you drive it off the lot, the dealer will never give you that amount for it.

We are a little concerned about running into problems with this tenant as it looks like the person on the lease is not actually the person in the unit as well as the + drug use that may or may not be going on in the unit.  

All new cabinets are needed paint inside out all new windows like 60 plus windows to replace they have window AC units (but again that might be the norm for the area and yes I agree on the PM idea) and then she has a drug dealer living there, she is cool with it.

@Michael Wexler competition is everywhere just look at car dealers for example, I have one in pretty much every corner. 

If tenants are paying utilities, the best deal you can find from any reputable dealer/installer.

I was recently informed that there was drug activities in one of the units.