Reading the process in TFA, it's very much dependent on the comprehensiveness of the testing framework. And apparently, the tests never built a lobby in the bottom left corner...
Anything else it didn't try, is probably also not documented and not implemented.
With the growing use of AI in reverse engineering, we might need to shift our goals to more strongly verifiable ones, such as matching decompilation.
My memory is that you could make multi-level lobbies on the first floor and you'd end up with like a grand staircase.
Edit: Apparently just pillars no staircase - https://old.reddit.com/r/SimTower/comments/1q63yvc/a_nice_to...
I agree that you need to be able to produce source code that matches the original binary before you can start porting things.
I never knew this!!
Man, pre big-internet was so hard to find information on games. I remember for the original tomb raider a friend needed a guide, so I wrote and printed out them a guide for the full game, since I played it pretty obsessively.