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London Breed, 43, became mayor-elect of San Francisco this week when her closest opponent, Mark Leno, conceded. We sat down with her Thursday to ask about her plans for the city. The interview has been shortened and lightly edited.

Q: The conditions of San Francisco’s streets were such a big issue in the campaign. Would you call that your first priority?

A: Part of my priority, yes, is to clean up San Francisco. We need to make sure that people don’t feel that it’s O.K. to throw trash or urinate or defecate on the sidewalks. Yes, we have people who are mentally ill and there are people with challenges but we should not accept that kind of behavior from our residents.

Q: What else is on the priority list?

A: Homelessness is the top priority and dealing with tent encampments, mental illness and addiction. Clearing out tent encampments because they are a public health issue. There are about 100 to 150 people who are clearly mentally ill and who are cycling through the system and who need to be forced into conservatorship.