Not bug in CAD but more of human oversight maybe?<p><a href="http:&#x2F;&#x2F;www.slate.com&#x2F;blogs&#x2F;the_eye&#x2F;2014&#x2F;04&#x2F;17&#x2F;the_citicorp_tower_design_flaw_that_could_have_wiped_out_the_skyscraper.html" rel="nofollow">http:&#x2F;&#x2F;www.slate.com&#x2F;blogs&#x2F;the_eye&#x2F;2014&#x2F;04&#x2F;17&#x2F;the_citicorp_t...</a>