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Cockatoo Nest

It's quite hard to reference a bird known for it's crest when your building doesn't have anything of the sort. But just as a crest adds some extra inches on the bird, some extra flooring can add in more capacity to a building. In this case, you can logically have six middle-class families live in here without a single problem. Your inner city areas will certainly appreciate the fact that you've squeezed more gentrification with this little townhouse.

Get the props to make it pop here:
Workshop Prop Collection
Civil Mania: The Generic Collection