So the idea here is to add a command to apartment doors called 'preview' (or similar). When you do 'preview EXIT' the game returns what one would see by doing 'look' in each room. I would also make it so this could only be used on apartments that are available to rent.
Example output:
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The tiny screen on the door shows a series of images detailing the apartment:
Apartment X
This is main room of the apartment.
The couch is unoccupied.
There are exits to the out (o), west (w).
Apartment X Bedroom
This is the bedroom of the apartment.
The large bed is unoccupied.
There are exits to the east (e), closet (c).
Apartment X Closet
This is the closet of the apartment.
There is an exit to the out (o).
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This is just a rough idea. There might be good reasons to not have such a feature I haven't thought of.