A treasure I chanced across on the forum archives: the Empire State Building, by Joker.
The pak file: http://archive.forum.simutrans.com/topic/05218.0/15610/building.Empire State Building.pak (http://archive.forum.simutrans.com/topic/05218.0/15610/building.Empire State Building.pak)
(http://www.freeimagehosting.net/t/27dfc.jpg)
You can find his original post along with the source files at: http://archive.forum.simutrans.com/topic/05218.0/index.html
Awesome!
It should go into official pakset.
I was thinking of a collection of supertalls coded as monuments.
Like this, the biggest cities would indeed have a unique skyline.
e.g.
Chrysler Building
Burj Khalifa
Willis (SEARS) Tower
Chrysler Building
Bank of China Tower
Petronas Towers
Two IFC
Guangzhou IFC
Empire State Building
see: http://xl.skyscrapercity.com/?page=tournament&var=1