This Creation requires what's listed below in order to work properly.

Required Expansion/Stuff Packs:

• University
• Nightlife
• Open for Business

Installation Instructions:

I have tested it over and over again and naturally the only room which really needs all 4 walls is the bathroom. But here is a couple of minor things that happen with an open backed Doll House::

Cons:::
Neighbors come right on in.
Sims know what is going on in all the rooms..(so watch out for jealousy)
You need moveobjects on to place ceiling lights/burglar alarm

Pros:::
They do not fall off the edge:: lol
And rain does not come in.. lol
You can fix yourself right in the back and just sit there and watch all sims at one time..
(Like a peeping Tom)

None of these are really mis-haps or affects the game play...You can always just add a back wall if you prefer it that way...

It will also help to have "hide objects" set to "off" so all the floors are visible. This can be found in your game settings on the game console.
Thanks for downloading my lot! Enjoy it! Linda