Probably built in an area where you have to commute by car, though, so eliminating or reducing the car-owned space to make it more walkable, attractive, and human-friendly is likely not feasible. Which means you'll also have to drive to shop, and, and, and... further driving things apart with more parking, driving surface, and buffers for cars, and removing all other options as they become impossible (walking, biking) or impractically slow/expensive (buses, trains) due to low density. Same disease most of the US has.
Kinda looks like hotel/condo developments along the US East and Gulf coasts, actually.
A large reason why planners leave open spaces around tall buildings are for environmental reasons like shadow impact, and wind tunneling. Without the open space, the canyoning effect would be much worse--look at most financial district areas. So the taller the building, the more open space required.
If you've been to Berlin, I think their altbaus strike a fine balance between housing a lot of people while still maintaining good street life. The flip-side is that Berlin's streets are generally wider than most other cities.