If the tenant has really sensitive allergies then that can trigger a response versus not bothering someone else  at lower levels.Definitely you could have an inspector come in and look at the issue that is well qualified with the proper initial equipment and track record to see if a mold company and further testing is warranted.No legal advice given.

You could even make a hundred bucks or so by selling on craigslist but if you put it on there for free I bet you could have it gone by the weekend without lifting a finger.

On a sale of that size a partial exchange is probably your best bet.  

The bank won't/can't tell you and the attorney may or may not talk to you so the seller is your best bet preferably by showing you a copy of the notice they received. 

Look at the days on market on the Hagerstown MLS as well as the sale price versus listed price.

To hedge my bet, I want to switch from a year long lease to a monthly lease.

But it also depends on what the loan is versus the value.

What's the benefit of creating an LLC out of state versus in state where property reside?

You are talking about owner occupied versus investment.

You can be on a street that is all +$400k homes and one street over there are burned out shells selling for $20-40k.Your best bet might be to reach out to some Philly investors and let them have a piece of the pie in exchange for helping you get what you want in an investment.