I have watched countless videos of urban designs and I thought 3rd place is a known thing. Anyway a third place is a place other than work and home that people social in, can be cafe, pub. Etc. we have many of those so not sure what else they want.
Never be the one to say no to yourself. There are many people who are willing to tell you what you can't do or stand in the way of what you are trying to do. Don’t let one of those people be yourself.