Lachgast
Hi Aleg,

I just came across your remark (I'm usually not active as a contributor in Amstelveen), but the building has been demolished, so the parking lot is not actively used.

You can check statuses of buildings within the Netherlands using "Bagviewer": bagviewer.kadaster.nl

Within the Netherlands, using JOSM as the editor, you can use open data provided by the Dutch government, a link can be found here:
http://mijndev.openstreetmap.nl/~allroads/JOSM/Saved_session/NL_OSM_basis_%20layers_%20PL_AHN.zip

On the pdok imagery you can see that the service roads connect.