Tech tenants are still competing heavily for commercial office space in San Francisco, a new report from Cushman & Wakefield has found, as slowing leasing has been largely mitigated by a thriving subleasing market. Join the conversation: Follow @SFBusinessTimes on Twitter, "Like" us on Facebook and sign up for our free email newsletters. The firm's quarterly San Francisco Office Snapshot found that while the overall leasing rate slowed to its lowest in the third quarter since 2001, the companies...