The duplex itself is a disaster it is a 3/1 and 3/1.5 vandals got in when it was vacant and cut pipes and electrical basically would need to be gutted and probably over 100k in renovations.  

However, the attic does not have pipes to put toilets, sinks, etc.

The main "con" I've seen with trenchless sewer replacement options is that epoxy lining or pipe bursting methods will not solve a main sewer that has a 'belly' between the house and the city.

Vacant properties in the winter run the risk of pipes bursting so avoid those.

We only got sunlight piped here twenty years ago. - Not taking into consideration the foundation issues.

You may also be able to connect with a local hard money lender to fund your rehab.For my clients who have exhausted those options, I recommend pursuing a refinance-rehab loan that could give you some cash-out to get started, while also funding your whole budget to be held in escrow.

You also have to deal with winter weather in the northern states and possibility of pipes freezing and higher heat costs (which would be paid by the tenant once rented out).

The most exhausting part of talking rates with buyers was trying to get them to understand why it was in their best interest to buy when rates were higher and competition was lower.

It is often too difficult emotionally or mentally exhausting to give up their previous home.

PLUMBING expansion tanks for hot water heaters, copper scabbed into galvanized pipe and proper venting HVAC - sealed duct work and properly sized for sf.