I've surveyed the place. It still *looks* as a restaurant/bar/something of sorts, but there is no signage indicating what's housed here, what the opening hours are, etc and it looks closed.

Research on the internet indicates that at least the original French restaurant (Blue) has been closed (kvk status "uitgeschreven", no date given without paying, but not relevant either) as are several other restaurants and other companies at this address. 

So for now I've set it to disused:amenity=restaurant - and removed the name and cuisine. This should make it easy enough to reopen/change it if and when  something new comes along.

Related changeset:
https://www.openstreetmap.org/changeset/152244731