Downtown LA's elevated pedestrian plazas on Bunker Hill, as depicted in the movie Her, are a great example of this. Office workers drive in, park in an underground garage below a skyscraper, take the elevator up to work, and walk around a multi-block radius to grab lunch, all without ever stepping foot on a city street.

The Shinagawa District (where my company's headquarters were, in Tokyo) has a big raised district, connecting a bunch of skyscrapers, stores, and even a major train station.

I suspect that there are several others (like Shinjuku), but I didn't really spend much time, in those areas (Tokyo is really big).