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The National Harbor in Maryland, a suburb just across the border of Washington DC was built with La Rambla (Barcelona) in mind. Built in 2008, it's a "new age" development in mini city form that works it's way down from the top of a hill to an open waterfront on the Potomac River. Along the main corridor there's a series of shops, restaurants, art galleries, and small vending stands in the tree lined center median. Feel free to watch it all, but I'd suggest skipping right to either 5, or 6 minute mark.
I’ve been there once, and it felt really contrived. I’ve been to DC 4 times since, and it never occurred to me until now to even remember National Harbor.
The thing which occurs to me is that it’s not the neighborhoods which are missing, it’s the transit. Make the transit useful, and the neighborhoods will follow, assuming the zoning and parking minimums allow it.