I may be off, but I imagine that in a place like New York there would be little "ghettos" of magic users.

In our last run of the RP there was a bar owned and visited by some of the better respected members of the community and I can imagine such a place would draw people to it.

I would even go so far as to imagine that there are hidden rooms in alleys marked with magic where people could go to hire or offer their services, or just to talk about the troubles and benefits of magic with people who actually understand.