Let's say my apartments are in three buildings and they are surrounded by a fence outside; let's say I drop my wallet somewhere inside one of those buildings, so I'll say
I dropped wallet somewhere in the building 1.
However, if I don't know where that happened in the apartments, but somewhere inside the fences, meaning the apartment property, for example, the walkway, the parking, etc., how should I describe that. Obviously saying
Somewhere on the property of apartments
And I often hear
Somewhere around the campus. Of (Office, Shopping mall, Apartments)
Is 'campus' idiomatic here?
So my question is how should I describe a property with buildings,walkaways etc. combined.