. >> reporter: one glimpse of this future comes via a new video from office space services giant cushmannd wakefield: >> imagine you now need twice as much space per person, probably three times as much space per person in a large skyscraper because they were packed in like sardines before. for the next three or four years, people are gonna be really uncomfortable about being in close offices, tightly packed elevators. >> anything that requires an elevator is going to be very hard. >> reporter: dave kenny, c.e.o. of the nielsen company, a global market research firm, has done the math on how long it would take his employees in lower manhattan to get to their desks under the new c.d.c. office guidelines: one person at a time in any elevator less than six feet across. >> i calculated to, to refill our, you know, floors in new york, people would be in line for over four hours to use the elevator up and use the elevator down. >> reporter: bottom line, then, predicts nick bloom succinctly: >> catastrophic drops in value. >> obviously, as an owneof commercial office space, i think he's wrong.