Belgian immigration lawyer

What for? Lawyers are often the last people you need to see in the immigration process, and then it's often a matter of throwing good money after bad.

Fragomen in Brussels is one I know of that are good.

Fragomen Global LLP
Kunstlaan 44 Avenue des Arts
B-1040 Brussels, Belgium
beneluxinfo@fragomen.com
T +32 (0) 2 550 1020
F +32 (0) 2 550 1029

You don't need to pay a small fortune to a lawyer to be told the answer to that - it is NO.

The common required feature of all types of application for Belgian citizenship is to have been a registered resident for the last five years (and in practice, because of the way the bureaucracy works, at least some months longer than that).

Yes and yes, although some temporary absences from Belgium within that time are acceptable provided that one remained registered.

Note that 5 years registered residence is just the starting point, there are other conditions, language competency and "integration", for example, to be fulfilled as well.

Wikipedia is usually an excellent source for this sort of question.
https://en.wikipedia.org/wiki/Belgian_nationality_law#Naturalisation_as_...

And yes, residency has to be current and continuous, so your property ownership does not qualify you.

OK, since you don't seem to understand plain English, let's try you on legal French. This is what the actual law on the subject says in its French version:

3° l'étranger qui :
a) a atteint l'âge de dix-huit ans;
b) et séjourne légalement en Belgique depuis cinq ans;
c) et apporte la preuve de la connaissance d'une des trois langues nationales;
d) et est marié avec une personne de nationalité belge, si les époux ont vécu ensemble en Belgique pendant au moins trois ans, ou est l'auteur ou l'adoptant d'un enfant belge qui n'a pas atteint l'âge de dix-huit ans ou n'est pas émancipé avant cet âge;
e) et prouve son intégration sociale :

Comprenez?