I'd like to see Church Street redevelop some more. Lots Of potential. 158-172 Church Street looks like a good location.
https://www.google.com/maps/@40.7153...2!8i6656?hl=en
Getting rid of those crappy stores would be nice.
In terms of condos, anywhere West of MSG is prime land for condos/residential. I'd like to see more rise in that area as opposed to Midtown North. It would be good for aesthetics as it would make the skyline mass even bulkier.
Anything bordering the West Side Highway would be nice. With views of NJ, and the Hudson, its a desirable area.
In essence, I'd like to see a height increase between Midtown and Lower Manhattan. While those neighborhoods are traditionally a mix of low/mid rises, a little more height would be nice as it would bridge both skyline clusters into one.