Jeffery Woo, Esq.
Sedgwick, Detert, Moran & Arnold LLP
Complex Rental Property Group
As for GGM I've never personally had any experience with them -- so keep in mind that this is second hand information from the experience of my client. It may be because they are so busy with all the condo conversions they do in the city but I was told, similarly to Andy Sirkins' firm, they were uncommunicative and it takes a bit of time to get a return response.
I've heard good things about Murakami Law though I've never personally known anyone who has worked with them, their website: http://www.murakamilaw.com/. Unfortunately Andy Sirkin's & GGM are the only two firms that my clients have had experiences working with, but the following link is provided by the San Francisco Bar to help people looking for qualified attorneys find what they need: http://www.sfbar.org/lawyerreferrals/real-estate-lawyers.asp.
Good luck on your search!
Andy Sirkin is great and still in business as far as I know.
Lyssa Kaye Paul used to work with Andy Sirkin and she is very good on TIC units but not sure if she does condo conversions. Lyssa now has her own law practice so I would give her a call.
David Gellman and Boyd McSparran of GGM are both very good and I have used them for various real estate issues.
Much of the condo conversion information is available on the internet.
Condo conversion is kind of a "cookie cutter" process so I suggest you call a talk to a few attorneys ask a few other REALTORS who may have experience in this area..