I PM'd this to Herby, and he thought I should share with you all. Remeber, he and I are in the US; don't know if this works for other countries where the game may have been marketed.
...Electronic Mall Madness (funny, I'm not sure there was a non-electronic) and the two kinds of escalators.
If you have a yellow box, or a Hannah Montana version, it'll have tiny steps; the large step ones [boxes] were purple or pink or combinations of those colors. Someone once said 'green', but Ive not seen that box. ['Large' as in large enough for a small coin, not a GW base.]
Of course, one could try to build up the tiny steps to big, but not a conversion that seemed worth the effort.
A friend saw a Battletech arena made from the outer walls, so the yellow box found use in these parts anyway...
If you google 'Electronic Mall Madness' and look at images, I know I found examples.
Doug
Edit: Also, failed to point out, the shops at ground level are just facades; except for the skywalks, it's just a single level map that appears multi-level.