Or is it enough to give the buyer/vendee multiple notices, terminating with, "If the defect is not cured by XXXX date, the contract will be considered terminated"?

Common sense.

If this HR block person doesn't know (which is common with them sadly) it maybe time for another accountant 

They may be lazy or not care because they think no one notices and it ends up getting dealt with.

It's a common mistake to think you can remind them enough times that they'll suddenly grow a conscience and pay you everything they owe and apologize.Start the eviction process.

Since they are not common, or in any quantity to any area, they are hard to finance since they are hard to get comps. 

Avoid common mistakes like underestimating costs or overestimating rental income, and start with something manageable like a small rental property.If you have any specific questions or need help with financing options, feel free to ask!

I know partial assumable loans were (and still are to some extent) pretty common place in commercial real estate financings, but does anyone know of a residential real estate lender who offers partial assumable loans on individual mortgages? 

. :) I suspect in SC my type of services will now become common place.

@Tyler Speelman pretty common in this area (NJ) but I think depends on location.