There was just a pretty huge rezoning (with much NIMBY protest) of the Gowanus neighborhood of Brooklyn, close to Manhattan, which is currently mostly composed of empty lots and single-story warehouses/light manufacturing around the corner from desirable neighborhoods of $4m brownstones. Now developers will be allowed to build residential buildings up to 30 stories there. I live nearby and walking around in just the last few months the number of new projects starting has been kind of extraordinary. https://www.curbed.com/2021/11/brooklyn-gowanus-rezoning-dev...

Similar story currently underway from Manhattan's Lower East Side a few years ago: https://en.wikipedia.org/wiki/Essex_Crossing

Even if it's already densely built, there is plenty of space that can be better used.