And if they are a hobbyist/part-time builder, then they should engage the proper professionals, i.e. a title officer, civil engineer, architect, contractor et al to assist in reviewing the project's feasibility.

If you are renting to professionals, you shouldn't have to worry about the landlord/tenant laws.

Or maybe there's a special sauce for sloppy tax professionals?

I’m also aware there could be tax advantages to running a rental business, which could help offset the shortfall.I’ve had experience with short-term rentals in the past, but I found them to be a headache.

Two of the units have their own W/D. 4 others share a separate W/D so it isn't taxed very much.

I understand that means paying the right professional for their services. 

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

Apply the 70% rule to determine your maximum allowable offer, then negotiate and get the property under contract, ensuring your agreement includes inspection and financing contingencies.Arrange professional inspections to uncover any unforeseen issues, using these findings to negotiate concessions or confirm your repair budget.

Work Quality:I hired professionals to inspect the work, and they found multiple issues and evidence of negligence in the construction.

While I don't do this professionally, I have a software team that works for me overseas for my real estate business needs.