This area is mapped as part of a school multipolygon (relation/3255081), which I guess makes sense if you look at 
https://josephbracops.be/plan-dacces/
But the site is also a supermarket (check mapillary) and the Erasmus school (http://courserasme.be/erasme/index.php/fr/) as well as an annex of the academie (https://www.aca-anderlecht.be/contact/) in the same way as the Athenée. How would you suggest we map this?
I must admit I'm not a fan of a single multipolygon with parts this far apart...