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I did a test lot on how many segments of walls that I can build. What I did was 40 segments on 20 rows on each floor, which brings it to a total of 800 segments of walls. I build the second floor of walls, and then a third floor of walls (I kept doing it until the game won't let me build any more segments. What I came up with is 2100 segment-of-wall limit. So, if there is some information that I could come up with, it would be useful, because I, myself, would want to change the limit to a higher amount, allowing me to build highrise buildings.
I believe that ther has to be a way to alter the game so that I can build more walls. Because NIGHTLIFE is comming out this fall, let's beg Maxis to change the Max of Wall Segments, so that I could build a city-like experience in the community lots, like a multi-purpose building for nightclubs, performance shows, casinos, restaurants, and more. And, I want to build bigger lots too, that are like 8x8, 9x9, or even 15x15. I believe that 5x5 is too small for complex community lots.