I was just checking out this website called Bklynr that publishes a bi-monthly set of in-depth stories about all areas of Brooklyn (not just the popular ones). In one of their articles, editor Thomas Rhiel used NYC's free Department of City Planning PLUTO data set to map out the age of every single building in Brooklyn.
The buildings are given color codes indicating their age. It is then easy to see where developers are targeting their newest and fanciest buildings and in effect erecting giant towers right next to old brownstones. It's an alarming trend that you've most likely heard about in the media as reports increase about how Brooklyn is losing its character because of these developments.
The map is incredibly thorough. Have a look here.