I am also a bit of an animal lover and my husband and I have two rescue cats and two pugs all of who are very spoiled.

I feel your pain...once had a tenant that turned the house into a dog rescue facility... what a mess..  

My first rehab flip was a failure had to have my mom and dad rescue me.

@josh julyhttps://www.chowhound.com/post/postcards-operation-bbq-relief-carr-fire-deployment-1076316https://www.chowhound.com/post/propane-tilt-skillet-northern-calif-rent-1077834https://www.bohemian.com/northbay/food-to-the-rescue/Content?

I know , I have 2 rescued ones and the baby takes food from their mouth . 

If they make the condo their primary that opens up a number of options on the non-bank (private) financing side for rescuing their captive equity.

I rescued a company that drank the sub too lease option kool aid in Oregon..they did about 40 of them.. 

Any closing I've conducted where my client was forced to purchase under the gun, there was a serious underlying issue. when buying pre foreclosure rescue lease backs were legal in Oregon and Washinton that was our specialty.. and we did many a closing within 24 hours of the sale.. of course we did it ourselves.. being a non attorney state we could simply draft our own deeds get the seller to come to my title company simply for a notary.. then run it over the court house and record.. hand them a check for whatever equity we negotiated.. then courier a cashier check up to seattle to the big foreclosure mills and bring the loan current.. 

I would think you have to hire a PM and pay them up front to stablize and kick out the free loaders.. secure the house and haul all the stuff to the dump.. call animal rescue and have the animals removed.. 

You might also look into a Monetized Installment Sale to rescue a failing exchange.