Ok, this is a controversial subject. Areas get gentrified and the rents increase and more amenities come to the area as well. I guess it is good stuff for a landlord from a purely economic sense. See the attached list of zip codes. Harlem and Brooklyn are all over this list.

https://www.rentcafe.com/blog/rental-market/real-estate-news/top-20-gentrified-zip-codes/