The roof and HVAC will need attention first.

Traditional roof.

renovation including a roof replacement Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

In fact I'd guess you could probably structure a discount into your agreement just because of the logistics (no roofs, no foundations, no yards). 1031 isn't a terrible idea but you've got a few hurdles outside of costs - you're going to have to have some possible properties already identified as your window is small, you'll still have to manage the property unless you go through a PM, you'll lock up more/most of your principal since you're going 'bigger'.

@Jaekwan LeeA house hacking inspection checks for structural integrity, roof condition, plumbing, electrical issues, HVAC systems, windows, insulation, base and attic damage, unit conditions, and code compliance.

For example, I know many people who have bought a house in Ewing for $200k and it's renting for $4000+ a month and this person has put maybe $50k into it over a couple years including a new roof, updated cosmetics, and was able to BRRR out all the money.

Mostly because we have to add roof dormers and also for the expense of running the plumbing.

You didn't mention home insurance and that will need to be set up before closing.Don't buy anything yet (don't rack up you credit card balances), but window shop at the hardware store. 

However, we faced a few unexpected challenges:A hailstorm damaged the roof while the property was under contract.The main water line to the property failed.

Plus all the necessary stuff, like plumbing and electrical, roof and gutters, all the things that a 100 yr old house is likely to need, unless recently handled.