“The best New Urbanist center, in my opinion, is the brand new Rockville Town Center. Very mature. Very credible as urbanism.” - That according to Andres Duany, undoubtedly the most respected new urbanist in the country, but NOT the designer of Rockville Town Center, which is an infill redevelopment in downtown Rockville, MD.
You can view pictures of the rest of downtown Rockville
here. It is satellite city turned suburb of Washington, DC, and has a Metro station on the Shady Grove leg of the Red line. Rockville is the next locality south of Gaithersburg, which is the location of Kentlands, the first non-resort new urbanist development, which was designed by Duany.
Obviously these pictures are several months old. Construction has since finished and tenants have begun to occupy space.
The center of the development is a small town square. Note the architectural diversity, even though the buildings are all the same height. The building on the right w/ the green windows is a public library.
The sloped building is part of "regular downtown".
Note interior parking.
The brick building in the background is part of "regular downtown", but was just built 3 or 4 years ago.

This street is the north edge of the "town center" development, thus its considerable width. Just to the right there is a surface parking lot that takes up a whole block and cuts off the town center from the central part of regular downtown.
That block is currently in the planning stages to be redeveloped with residential buildings and a large hotel. It will bridge the gap between the town center and the skyscrapers of the modernist downtown Rockville, and will look like this: