Hey Miss Jane! - what's with the overlaps?
Ahh good question Miss dani. The overlaps are for some le-way in possible adjustments that may be needed later on. If the buildings positions needed to be tweaked then if they are on separate levels then it makes it possible. Also this back ground could be reused in another episode with some or all of it's elements. It's also if the scene needed a little BG movement in compositing, like some multi planing etc.
So very clever! Thank you!