Two years ago I made a CG model of central London for a university project [link]
and recently I was commissioned to expand it by about 10 times. Luckily they didn't want the new area to be quite as detailed as the original, so it took a lot less time, but it still came out pretty well.
You can kind of tell where the old stuff stops and the new, less detailed bit begins.
The model includes a few buildings that are planned for the near future, although thanks to the whole credit thing a few of them are delayed or on the verge of being canceled.
Here's a quick render. I'll deviate some better ones later, but I liked this one.