or just their name and dates would suffice?

I think you have a pretty reasonable case here to walk away without losing your EMD, especially if the seller knew about this and chose not to disclose - that alone should suffice.

Or is a simple email introducing myself suffice?

@Ryan SummersThere are several considerations that can go into the analysis of whether you need an LLC or whether a large insurance policy will suffice.

Talk with the City / government entity about the projected repairs to see if that will suffice to stop the demo.Once the above is done, then determine if it's a project you want to pursue.

Utilities - does it need city sewer and water, or can well and septic suffice?

I've used longer orientation/probation periods but I find that a 30-day onboarding should suffice.

If so, ask your lender if an letter from your employer stating you work remotely would suffice the deal. 

If that's the case, literally any market would suffice.

But seems like your experience in detroit should suffice.