Hi Mark-
Long time no write

How are you? Everything is great (as usual) in Rio.
Loss of property rights in Brazil is an equal opportunity danger for both foreigners and Brazilians. There are certain legal conditions (easily identified during property and owner(s)' documentation research) that could lead to either legal challenge to the ownership or governmental seazure.
The most common causes for ownership loss would be fianacial fraud and involvement in some type of illegal activities. Ordinary folks not involved in heavy duty illegal drug trade, have to watch out for law suits (just like in the States), using property as collateral for debts one can't handle, and acting as a fiador for friends and family.