Céline, thanks, this is good work. I went through the document and left some questions in the comments.
I e-mailed your question about the pre-emptive right to Fonds du Logement (two of my neighbours told me it is forever, but the Fonds’s FAQ is not so clear).
A few days ago, I got a phone call from a Fonds du Logement employee. She confirmed that the Fonds has a pre-emptive right forever on the properties it finances. However, she said it is very exceptional nowadays that the Fonds uses that right. It is rather a formal procedure to prevent that people buy several properties with the help of the Fonds and sell each of them with a profit.