Maybe someone else knows about forums directly, but there are a number of sites/blogs that have a big focus on development and transportation:
- Curbed SF (better content than Boston's, at least as of a few years ago)
- Hoodline (more "UHub"-like than others)
- Streetsblog SF (wish we had one here in Boston, tons of Bay Area transportation coverage)
and you should definitely pay attention to SPUR, an active urbanist non-profit.
Awesome, thank you very much! I appreciate the help and will def check out SPUR.