How to cut and paste text into notifications

Hello everyone

We currently send Location into notifications, however it's a bit too long. 
The full Location looks something like

region/country/city/building/room/rack. 

I'd like to cut this and have the Building only. 
I do not see a way to do this with the expression language. 
I also tried entity.Location.ParentLocation.ParentLocation.Name . The notification validation mechanism does not accept this. 
Any ideas would be welcomed/. 

Cheers