Security might be another reason- these days people might be skittish about the detailed schematics for their buildings being out there for just anybody to get hold of.
I'd love to get the elevation drawings for some of my favorite skyscrapers, they're designed by now-defunct firms like Emery Roth and Sons, or Kahn and Jacobs.
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"Build me to the heavens, and Life never stops"
"Live as if the world were as it should be, to show it what it can be"
-Angel
"Prayers are fleeting and wars are forgotten, but what is built endures"
-Ambassador DeLenn, Babylon 5
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