Although projects may not have complete control over the public space that surrounds their building, at minimum, provide adequate signage that communicates smoking is prohibited 25 feet from the entrance. Signage can help deter people from standing outside of the door to smoke.
Additionally, do not have designated smoking areas or ash trays outside the entrance to further discourage smoking by the entrance. For documentation purposes, provide a photo or plan indicating where the signage will be installed, and note any additional efforts (such as no ashtray by entrance or security that may enforce the no smoking within 25 feet rule).