They are both liable for rent and damages.

We have lots of 1920's homes and they were wood frame and stucco but overtime and termites it can be lots of structural damage underneath. 

One of the ways is to get a deposit with the lease agreement, and a document signed that says if the tenant doesn't perform, that deposit is your liquidated damages.

If the breach is remediable by repairs, the payment of damages, or otherwise and the landlord adequately remedies the breach within five business days of receipt of the notice, the rental agreement shall not terminate by reason of the breach.

Smoke damage and mold issues and electric meter monkeying/diverting (with huge fines from your utility) will knock any extra monthly you got out quickly.   

When wholesaling, it would be important to disclose to the seller that you are a real estate agent, but in this particular case you are not acting as an agent, but as a principal, operating solely in your own best interest, with no agency duty owed the seller.if the seller, their attorney, the real estate commission, etc. is able, after the fact, to make the case that in your wholesaling activity you were not a principal, but an intermediary, then you would be potentially subject to fine, license suspension or revocation, liability for seller's lost income, and possibly treble damages for deceptive trade practices.  

For my questions below, imagine a vacant house of 4 years with roof damage (so expect drywall damage, mold etc)Wholesalers - If you have a house gutted and down to the studs and bones, are your investors more hesitant or less hesitant to buy than if the walls were up and debris scattered around?

Once we realized that the grass is not greener on the other side, the damage has been done.

He did some damage (minor stuff) to the unit before he left.

Just a week ago I had an inspection done from RHIP. two officer dressed like SWAT team visited my property and checked if my property is in good condition. here is my video thoughts: https://youtu.be/fScVegQ4cto?