Downtown San Francisco

Can anyone give me the following info:

1. Name of a street in downtown San Francisco that has a few upscale department stores; and
2. the name of those stores (at least two).

Thanks in advance, I appreciate it.
k

Thank you Eeek and Rugcat, for both mentioning Union Square. I was picturing Macy's with a big square in front of it and a parking garage nearby, but couldn't recall the Geary Street. I doubt I wil mention the street since you reminded me of Union Square--I'll use that. It has been almost 20 years since I've been to San Francisco, and I can see it in my head but couldn't remember the names.
k