They are in various states of remediation, from nothing to having virtually been ripped down to the studs.My question refers to outside frame plywood and vapor barrier. 

But I will agree, the remedy for this isn't that he gets to live for free, if anything it's that he's allowed to either deal with it or break his lease w/ no fee/penalty (due to the unit being uninhabitable per CA code). 

My realtor is telling me the buyers will want concession and advised me how much it will be and that I should complete the remediation. 

The seller did not want to pay for remediation so I threatened to walk away.

You can certainly try to get $20k from airbnb, but in the meantime you're going to have to have guests there. so I'd do the $1000 cleaning + furniture now, get guests back in the property, and run as usual, The problem nowadays with fires, and the reason that he shouldn't get guests in until this is professionally remediated, is that a lot of particulates are released into the air when materials combust.

My only remedy is to evict.

How is he remedying his debt situation?

Tank was pulled and soil remediated at about $8k.

I would ask for anything that is a health and safety issue to be remedied by the seller.

It will cost about 1k to remediate but my larger concern is will it deter people from renting and/or do I have to lower my asking rent price.