Here's a look at the fully 3d map of Lower Manhattan created by new mapping startup YouCity. Very stunning and well done.
You City: Sample Map of Manhattan from digitalurban on Vimeo.
I spoke with the president of YouCity last monthago and he informed me most of Manhattan is already done and told me all of the buildings are fully modeled in 3d by a team of modeler's.
It will be interesting to see how the mapping device evolves over the next few years.