Return prim/object to owner

I'm planning to rent space in building with many floors giving some fixed prim limit. I found various renting scripts but I noticed that there were actually no actual implementations to take care of the prim limit.

Is there a way for a script to return object/prim back to it's owner if it's violating restrictions I give for renting (either prim limit exceeded or prim on wrong floor)?

Something (in pseudocode) like this:

if ((primZPosition > floorCeilingPosition) ||
    (primZPosition < floorFloorPosition)   ||
    (primcount > max_prims))
{
   llReturnPrimToOwner();
}

I know I could also return them manually but that already might have done bad to my business by the time I notice the violation.

EDIT:
Would one way to be forcing renters to deed their objects to renting group and then allow the renting group to move/delete illegally placed objects?

I am not sure you can return individual prims at the moment in that way, although the new land /parcel commands may help.