But I need to be more like Keith and run numbers to find something that is a win-win for both parties. 

If the borrower's credit score is high enough, generally over 720, those stacking companies can get you business cards. 

It's a win-win for me. 

The tenant gets some cash which they can use for their next home and it's a win win situation for everyone.At this point you will have to get creative and work with the seller and the tenants.

If it's something like unpaid astronomical medical bills I would be more understanding VS it being something like an unpaid auto loan, unpaid credit cards, etc.If the rental market is soft in your area then sure - consider a strong co-signer - but if it's a more competitive market tenant-wise you should be receiving some better renters. 

Can I do something immediately to ensure it is not lost...The last one is a wild card and is a risk adjusted play...If I found the limit was 2 years, and I knew that the site was vacant for 5 years I would ponder who else actually knows, and can they prove it?

Are people more likely to respond to a phone call about buying their property or a post card/yellow letter.

What I do is leave a card on the box notifying the mailman that the property is vacant and he will take care of that mail. 

What are your thoughts on sending a letter/post card/card to someone who is getting ready to sell a home they inherited.

Whatever the situation calls for and makes for a win-win situation is what works.