The houses generate a gross rental income of $88,000/year and you could accept all of that from tenants in BTC (thus increasing the adoption and market for Bitcoins)
Why just 20%? Well, the rest is owed to the banks in FIAT debt.
However, the earnest money for such a transaction can be 100% in BTC using a 2/3 multi-sig escrow contract. Of which 1 key would be kept by the closing attorney.
Here's more information on the properties.
http://atlanta.craigslist.org/atl/reo/4506057278.html
OR
http://www.loopnet.com/lid/18592132
For more detailed information, you can send me an email at 'My Bitcoin talk ID' @gmail.com
Thanks,