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During my wandering across the internet I found out about the Walled City of Kowloon:

It was 6.5 acres of buildings, built on top of other buildings, blocking out sun light to the lower levels. It would have grown taller, but it was located by an airport.

Here's a short article on the city:
http://io9.com/5512888/the-walled-city-where-sunlight-couldnt-reach

and here's a cool cross section map, EDIT: fixed the link to show the whole map:
http://www.deconcrete.org/wp-content/uploads/2010/03/Kowloon-Cross-section-low.jpg

It really influence my vision of what some hive cities would look like, (yes I know there is tons of variety across the Imperium)

It sounds like a lovely place to go on vacation.

It hasn't existed in over 15 years it is now a park.

I would say its only a representation of a small section of a hive city (the part that is made of the lower-middle levels).