Is that "Joint and several liability" something on legal rental form documents?

What is the legal and right thing for us to do as the landlord?

She kept the apartments maintained and heated (one one system and service now) but never rented and legally converted it to a SFH with the town. 

I made money in an online businessThen invested in houses to fix up and rent.  

I am currently taking an online course for my license.

Labor will be on a credit card, since most vendors want to get paid online. 

I told him I can purchase the property as is, no need to fix anything. he told me he can't sell the property with that type of problem. im not sure if it has something to do with legal issues or if he just does not want to sell until he fixes that himself. the conversation didn't gave me the opportunity to ask this question at that moment.

Also on whether to retain the tenant or get a new one, it's almost always in your best interest to retain a tenant once you factor in loss of income b/c of vacancy period and then construction period for new tenant), legal fees, broker fees, etc. 

As more units come online, i need the flexibility to refinance tranches of homes. 

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