Stacked Cars.

Look carefully at the lit up button consoles above - they display the organization of parked cars on the tall oblong carousels. Unlike parking garages, these parking carousels obviate the need for ramps, allow for an efficiently packed building of cars, and take up a much smaller building footprint.

Turntables.
When the owner is ready to leave, the attendant brings the car down to ground level, backs it up onto the turntable, and spins the car around so that the owner can easily enter the busy street grid.

Lights are On, but Someone's Not Home.
Stacked cars are common with smaller scale housing as well.

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