I originally created a marker for this location back in 2020 based on the hints from Chargemap, but I have never been able to visit and the information might be a bit stale on Chargemap so not sure of the current situation.
The website for WankdorfCity has a map with the name of the buildings https://wankdorfcity.ch/konzept But I cannot find a map of the parking lots.
According to the data on OpenStreetMap and Google Street View, each building seem to have its own underground parking.
On the marker "Post WankdorfCity" https://fr.chargemap.com/post-wankdorfcity.html / 42284, a comment from July 2018 says there are 15x22kW stations and 3x11kW stations. The pictures show 3 parkings spots with Type2 socket and green paint with numbers 43,42,41. PP43 has "Besucher" written on it together with an electric car logo. It's difficult to say if the other spots have text because there are cars parked. The description says the chargers are in visitor parking U1 and access is only possible on appointment.
I had placed the marker on top of the green space marked "SBB Reserve" so I think that's where the Chargemap marker was back then. Now the Chargemap marker is on top of the "Majowa" building. That would make sense, as that parking entrance is labelled "Parking Post" on the maps.
On Chargemap there is another marker very close to where I had originally placed this one, called "SBB Hilfikerstrasse" https://fr.chargemap.com/sbb-hilfikerstrasse.html / 41963. That one has comments back to December 2016 and shows 2 Type2 sockets listed at 7kW. The description says it's for employees and might also be available to authorized visitors.
This second marker is probably about the parking lot under the "SBB" building. The entrance is from the east on Hilfikerstrasse. On the Street View images that parking entrance has no big sign or place counter, just the words "SBB CFF FFS - 3e - P Parking" on the building above the opening.
There are now also eCarUp chargers in this area, those are placed above building "Twist Again" and just named "ZapTec PP21/22", so it's hard to tell for sure if those are in that building or in the same parking as one of the 2 other markers seen on Chargemap.