New York

New York is where Manse Everard of the Time Patrol lives in the second half of the twentieth century in his timeline. What will the city be like in the futures?

In Poul Anderson's World Without Stars, there is still some business in Niyork but otherwise ivy and lichen grow on tall empty towers.

In James Blish's A Case Of Conscience, the crumbling pinnacles are nearly all empty all of the time because most of the population is underground. In Blish's Cities In Flight, New York, like other cities, flies between stars. 

Sf covers every (im)possibility.