Thanks - I am aware of that.
I am allowed 180 days p.a.
And my knowledge of the language is adequate.
Unlike some European countries, e.g. the UK, the estate industry is at least regulated through CRECI. However, they are largely poorly educated sales agents. The pass the CRECI exams primary school is quite enough.
CRECI agents are as unreliable as non-CRECI agents. It is just a bit easier to get them in court when you report them. At least that is out experience, so far.
In the south of Brazil things are definitely more professional.
Buying a house or appartment (for own use) is different from participating in an investment scheme.
What you need is a local realtor, with CRECI.
But you will also need a visa (you may stay only 90 days otherwise) and preferrably some working knowledge of the language.