Gentrification simply means that rents go up in certain parts of the city. It doesn't have directly something to do with new investments.
In my experience gentrification is always associated with renovation and new business investment. The wikipedia article seems to confirm that this is not an uncommon experience.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.