I learned how to make skyscrapers and tested out a few in lucky palms. Here is one example. The http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/787/334/017/00/screenshot_original.jpg
The short building is the regular 5 floor limit. The taller towers are done using CFE.
They look pretty good close up. About 20 like this and I'll have a decent "city".
There is one problem. Even even with advanced rendering on high this happens.
http://lvlt.thesims3.com/sims3_asset/sims3_asset/media/shard000//shard000/801/334/017/00/screenshot_original.jpg
I am concerned also that having many of these tall towers in one town will cause a lot of lag.
Does anyone have any suggestions?