Lot less multifamily which is why I haven't bought but it is where I grew up.Make sure you study the eviction laws, I believe tioga County (but could be a different close county im not sure) my lawyer told me that you now HAVE to pay to pack up an evicted tenant professionally and store it for months at your own cost if they leave their stuff behind.

in our area that is a real big deal.. we did another demo and left a few pieces of flooring an inspector came on our job determined they had asbestos in them and we violated taking asbestos items to the regular land fill.. that cost me 19k in fines and 18k in lawyer fees to keep the fines from being really big..

As always, speak to a lawyer. 

Is this something I should hire a lawyer/other professional for or can I just do it myself? 

Reason #1:  If you're not careful even a bad lawyer can get it turned into a purchase, with all of the rent credited to the purchase. 

(Note: I'm not a lawyer, but this is my understanding based on my experience)  A human being will need to sign on behalf of the LLC and that human will need to have the authority to sign. 

Who is the Lawyer against them? 

As you said, they can’t make him sign the release.someday they’ll fix this issue but until then you need a lawyer, or a new lender, or the seller needs a buyer.Consider this a 2 on a scale of 1-10 for real estate problems.

Other than an intro call, I haven't started working with my lawyer, so that's why I haven't asked him.

They are lawyers so can appeal through the whole process essentially for free.