today we are going to talk about green building, anwith me. he works closely to develop regulations and their implementation. in every case where there is a regulation or some other legislation, we have to consider, ok, how are we going to implement this? that is one of the biggest issues. developing an implementation plan and trying to communicate it to you, architects, engineers, designers, is one of our big challenges. we also want talk about some issues relating to green building's current and coming, and i think i have prepared a handout. we will start with a discussion of overall green building issues. most of san francisco is built with older existing buildings. we have some small number of new buildings every year. we have the california, and in august, 2009, it ratchets up a lot. we have standards for the ordinance. we do not have a whole lot of stuff that addresses 90% of the city's existing building stop. >> as for practicality in meeting safety standards, they are all necessary to address performance of existing building sites. >>