Do you sell the property and bet on the tenant not being able to exercise their option because of the eviction on their credit history? 

The ADA calls is "Sufficient Medical Documentation" In a nutshell you can ask for1.

I am a full-time medical research analyst by trade who is excited to learn as much as possible about real estate investing.

LIABILITY COVERAGESCOVERAGE Premise Liability, LIMIT $500,000COVERAGE Medical Payments to Others - $ 5,000Payment Options:Annual Paid in Full $2,111.52Monthly $ 410.23 down payment with 10 monthly payments of $ 183.50========================================Are these numbers about what you would expect for a (2-unit) duplex?

No , never buy prepaid professional services; accounting, legal, or medical.

The homes could have just been refilled due to circumstances with the old tenants (i.e. financial hardship, divorce, medical issues, etc).

Medical bills, maybe.

I'm appraising a medical office condominium, and the owner's association appears to be undercapitalized... 0.3% of market value.What is the general rule of thumb when analyzing commercial condominiums and the amount of reserves that they should have on hand?

Also, even if you take an older property and do a full renovation (new plumbing, electrical, roof, etc, etc.) it is unlikely that you will be able to provide all the amenities that new(er) construction probably do (e.g. exercise room, higher ceilings)The counter example is a old building that was build with large units and lots of architectural detail in a 'trending' part of the city.

Plus, if you think you'll ever dip into the equity on this property to buy another, then this whole thing is an exercise.