How would you design the city of the future?
Future think is hard. Imagining what life will be like some distant day is hit or miss. Will we all take a flying carpet to get from home to work?
I would design a city with no major traffic. Busses or trollies will pick us up at certain points.
Bikes will be there for the young. Road lanes for the elders on walkers and wheelchairs will also be by design; strollers and carriages will be able to get by. As will those walking as sidewalks will be wider.
Cars will be kept outside city limits. They are useful for visiting friends or family in the hinterlands.
Trees will be a prominent feature on my city streets. As they already are in NYC in our present time.

Homes will be modernist, whatever that means. I like glass bricks.
There will be balconies cantilevered on structures no taller than 12 or 14 storeys.
Lobbies will open to stairwells and glass elevator banks. Each floor will offer a common room and plenty of privacy for when you prefer not to be communal.