Fire damage in a attached town home in Houston

[Newt Hatcher Scott]

I am looking a purchasing a town home which has significant fire damage ( Trusses are shot). 

The fire originated from the adjacent home so how does one go about fixing town homes with shared walls and roofs?

Would I try to strike a deal with the adjacent owner to repair the shared structural members and roof?

Or is the only way I can come out on top is to attempt to buy the adjacent building as well?