Let me give this some thought and come back to it. My mind is also working on the various levels of tunnels, upper and lower streets and multiple addresses within buildings.

Mapping the individual accessible entrances lifts, elevators, offices, bathrooms and everything else is the reason for the attempts to tag this. The project though is for the entire loop so we had some initial meetings with the City of Chicago Mayor's Office for People with Disabilities to plant the idea of improvements to the data on the portal. Indeed what we are trying to tag here is a lift just inside the entrance at the southeast corner of this building which is meant to convey people of differing abilities to the level of the regular elevator lobby. The initial problem for a person using a wheelchair is access to the intercom to get the entrance door open.