I have seen those go tumbling down the hill and the ones next door with regular foundations were virtually unharmed. 

All of this to say, unless the agent has a proven track record for renting similar places or a network of potential customers (read: international companies regularly relocating workers), I wouldn't bother with them.

Regular repairs and maintenance are not included in the tax basis of the home.

Further, once someone became serious about the purchase it would be disclosed by necesity of the process.The first buyer to offer on the property, negotiates with the lender and this initial offer proceeds much as regular transaction what with the ability to have due diligence clauses such as inspection, financing etc...

For a landlord, ongoing maintenance is just a routine part of your expenses.  

How is turnkey different than a regular 2 unit one would find in MLS?

@Wayne Brooks What would you use as regular protocol to search for "unrecorded" liens that you can track down but may not necessarily be in public record like you alluded to above?

(My dog, Daisy, gives me regular supervision.)How do you feel about “Hire America”?

It's more expensive than a regular concrete stain or seal, but the final look is worth it and it's almost indestructible (unlike a regular stain that will scratch and wear off).

They will collect the insurance premium each month in your monthly mortgage payment…As far as an “umbrella policy” that is something in addition to your regular homeowners policy (it does not replace those policies).