You do not say whether the pipe is Cast Iron or not.

So I guess one has to have an iron glad contract written up by a good real estate attorney then documented at the county level. 

Property Cons:The property has original knob & tube electrical wiring, cast iron plumbing, needs a new roof (estimated at $18K), major work to the original wood siding & windows (estimated at $40K – need to stay within Historic District requires), and extermination of pests (estimated at $5K).

No one told me because, I hope you guessed it this time, previous landlord constantly threatened them with a bill and/or eviction every time a clog arose.It matters in the legal sense that the clogs are from root intrusion on a 75+ year old cast iron sewer line, but it doesn't matter in a practical sense.

Metal roof is fairly generic and can cover a variety of roofs - brass, bronze, copper, iron, steel, aluminium, etc.Around here a metal roof from the 1940s would most probably be a {corrugated} galvanized steel roof.  

Welcome to BP @Hylton Irons and props to you for starting early...

There’s a hotel data company called STR (ironically NOT for short term rental!)

The house was built in 1959 and had cast iron sewer line.

But my impression like Tony's is that the true breadth and depth of the OP Zone legislation isn't all ironed out yet.In any event though - No it is not normal for you to be able to 1031 into a real estate fund @Brian M. 

Or, just getting a feel for your potential tenants if they will take care of it will be part of the process.As I recall, most cast iron pans can't be used on glass tops.