The property is a duplex, and he plans to give all the proceeds from the sell to his daughter.

Great way to connect into the market you want to serve.Next tip: come to a monthly meeting of ROA (https://www.laneroa.com/). 

The tenant isn't stupid and knows he owes the rent, so he will probably pack up and leave before the court hearing.

Step outside to the fenced backyard or relax on the swing on the front porch.

I know I will need to get some legal advice, but I am really looking for some input on where I should even start. 

Originally a 30 year lease, theres about 20 years left to an advertising agency. 

Some lenders may also want to see law and ordinance coverage in your insurance and perhaps a rebuild letter from the city stating that the property could be rebuilt as a residential 4plex if destroyed. 

Owner financing and HELOC on personal residence How did you add value to the deal?

What is the best way to aviod this.

I would start by talking to a lender who deals with construction loans.