tammie mattson, thank you so much. really appreciate you coming on and sharing your expertise. >> thank you so much. >> we'll be right back with a look ahead to apec. how san francisco is addressing one of its most troubling problems homelessness. as the conference prepares to kick pet flag was raised today at san francisco's city hall. mayor london breed officially raised it to kick off the global summit. the asia pacific economic cooperation forum, or apec, begins tomorrow. and you can expect quite an impact on san francisco in several different ways. if you're in the city, there will be unprecedented security, including street closures and transit changes. the main security zones are around moscone center and the fairmont hotel, where a lot of the leaders might be staying. apec runs through november 17th, but many streets won't reopen until monday, november 20th. and, you know, there will be protests as well. so the city is putting its best foot forward in an effort to show off all of san francisco. that includes cl