Second Floors or Basements to base?

Possibly an idea to have some buildings that are stairwells to upper of lower floors of the base. This is just food for thought for expanding the game without having to use the entire area granted in current version

You click on one of the stairwells to "travel" (and the travelling in the stairs could be like the cloud screen when you jump from base to base to attack, which would simplify the Dev process). Ideas for floors:

A new looking arena with clouds and turrets for higher floors and dungeon/cellar styles for basement
additional storage areas only reachable if 100% of base is destroyed by attacker
an area for the mini games...
A whole host of new troops and buildings and tactics required for the relevant floor

Food for thought...

That would certainly address the issue of no land space.

The basement could even be just 4 squares only at the start, but as you dug in to it to develop it you could uncover gold in the ground, or dark elixhir or new resources.. Eventually making the area the same size as ground level. could be all creepy and dungeon-like down there :)

It need not be an area to attack or defend, just a place to mine for more items or store more items

I really like the idea. Shoudnt they just let you buy more land for maybe idk 100,000 for 12 sqaure land or somthing like that once your TH is lvl 10?