[patall]

Probably just didn't really buy the house. Many houses are part of an association (BRF). When you buy one, you practically only buy the right to live in the house plus a share of the entire association. The fee that she paid was towards that association for things like maintainance, managment, trash-fees, internet, parking, likely heating and water, and possibly interest on the associations loan. It's just a different structure that many countries have for flats in a building, in this case applied to single family houses.

[skissane]

Here in Australia, I’ve seen what we call “strata title” applied to “single family homes” before (American terminology, we’d say “detached houses”) - it is uncommon, much more common with apartment buildings or townhouses/villas/semidetached (you share walls and maybe the roof with your neighbours, but there is no one above or below you)-but not completely unheard of