Let them leave. They're well funded and there are companies in San Francisco with more employees and that pay more taxes. a) In six years time its more likely

Let them leave. They're well funded and there are companies in San Francisco with more employees and that pay more taxes. a) In six years time its more likely that they'll look for an extension of any breaks than begin paying them. b) If they plan to grow to 1500+ employees after 2011 I can't see them being able to stay in that location anyway.