By Joe Gose, The New York Times Company After Sept. 11, the lobbies in many U.S. office buildings permanently changed as landlords beefed up security, adding cameras, turnstiles, programmable elevators and other technological tools. All who entered were required to have identification, and guards recorded who came and went. Now, as pandemic restrictions ease and workers begin to trickle back into the office, the lobby is changing again, this time with an emphasis on health and safety.