chris jensen is looking at me like he is all over the map. >> supervisor, peskin, i will do my best to answer your question. it's in deed a head scratcher. i mean that to say that it is complex. i don't mean to be facetious about this question at all. it's a very serious one regarding changed circumstances. the seek what guidelines acknowledges that changed circumstances can lead to a change in the determination and impact would occur and in regards to a given project. when we're in the process of preparing a community plan evaluation. if that case, we look at is there anything about those changed circumstances that results in a new peculiar impact. if that is the case, then we would be required to do an environmental impact report if we could not avoid that impact if it was unavoidable. an example of this, is when we have a historic resource of historic structure that is proposed for demolition, that was not previously identified in eastern neighborhoods, where we took the approach of laying out signature signified newly deterd historic resource, that would require an e.i.r. otherwise