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

Ask a plumber to detect for leaks you can't see. 

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

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.

Our approach for implementation is to break all repairs into 4 categories by priority:1) Health & Safety - most important as could result in tenant lawsuit2) Property Preservation & Government Requirements - don't ignore a roof leak that costs hundreds to fix now, but will costs thousands in the future.

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.

Before or after accepting:- Lower the sales price  or lower the sales price AND lower seller credit (only do this if you are confident in the sale)- find a value add opportunity (I've had situation where we put new roof on and split the cost 50/50 with the buyer via credits to up the home's value to meet appraised value).

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.  

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

Another thought - When purchasing HVACs, roofs, tree removal, siding, etc. you can very easily pay "retail" (just look for the biggest ad campaigns online) or you can save 30-50% by being your own GC and finding or going to the crews directly.