You absolutely want to be concerned with this.I would just argue what you're concerning yourself with today may be totally different in that 10-20 year period.

Although I’ve been investing in real estate, both directly and indirectly for 45+ years, I still get a “queasy” feeling when an investment does not perform as expected.My “aha” moment occurs when we reach the point when, despite the investment problems, we’re able to still show a good/substantial profit at the end of our holding period.  

Quote from @Chris Seveney: If you can borrow private money for that period of time at 10% that is a very good rate.

For multifamily deals, positive cash flow often comes from finding under-market rents where you can add value through light improvements or operational efficiencies.

Multifamily is top of mind since it provides a mix of efficiency and long-term growth.

So if you sense the deal is not going to go through within the diligence period you can cancel the contract.

Furthermore, if anyone knows of a third party that provides the data or is interested in periodically gathering the data for me from the county courthouse (for a monetary reward), please reach out.

I predict that the guys who are fully leveraged and cash flowing $100 per month will be motivated sellers when the next big correction happens.actually its either them or they walk and its their lenders selling that is what happened in that time period.. and was pronounced in certain markets.for me personally  I don't want to risk  my credit and finances and borrow 75k to make 1200 a year... or even 2400 a year if its a market that has a history of no appreciation and I don't feel there is going to be any significant appreciation.. 2 to 3% a year does not cut it.but I will take 500 a month negative or 10k a month negative if I think there are huge gains at the other end.. 

This is a very valuable skillset to have in your arsenal as an investor that can dramatically increase your net worth in a short period of time if the strategy is applied correctly.  

They accepted rent for a time period they knew would not entitle them to the funds.