CURBED SF—Today we announced the Curbed SF "SWL 337" Planning Challenge, the San Francisco edition of our New York site's "Curbed #001: Curban Planning" challenge, which went down back in July. Over the next month, we're hosting a design-off between our readers, asking any and everyone to conjure up a new development plan for SWL 337. We had a rollicking good time with this one the first time around, and hope to do so again here in SF. (Please find the details on our original post— you can check out the New York entries there, too.) Cash prizes total $500 on this one. Questions? Bring 'em on.