Dear Mateusz, please view https://rentopia.be/verhuur/ for an illustrated listing of their lines of construction equipment ; both rental and sales ; clearly aiming at professional use ; 

Looking at the neighbours : seems Fitness Experts weren't all that fit on my last visit : unless they elevated 'pumping iron' to a new level? 
see : https://www.openstreetmap.org/node/3994166773 

https://www.fitnessexperts.be/ gives a different address ; which in turn could imply that work on part of the construction site https://www.openstreetmap.org/way/1007819164 has been completed, looks like terraced housing (or perhaps apartments shaped to look like that) on the most recent aerial imagery ... ; 

Fitness experts might then be at https://www.openstreetmap.org/way/1007819154 ? 

Best to check before getting carried away. 