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real estate
There used to be a database on the Belgian Office of Statistics (Statbel) website that gave, by commune, average selling prices for villas, houses, flats and building plots.
I had a brief poke around and didn't immediately find it. You may be more lucky.
This is on Statbel website but only in Dutch or French, here is link to French version: http://statbel.fgov.be/fr/statistiques/chiffres/economie/construction_in...
The only one I know of is this one
http://en-be.billionhomes.com/
No transaction prices though, just listed prices. Don't know how accurate it is either....