See page 28 of http://openbook.sfgov.org/webreports/details3.aspx?id=2199 http://openbook.sfgov.org/webreports/details3.aspx?id=2199 — when a new apartment buil

See page 28 of http://openbook.sfgov.org/webreports/details3.aspx?id=2199 http://openbook.sfgov.org/webreports/details3.aspx?id=2199 — when a new apartment building opens in SF, 84% of occupants move in from elsewhere within the city.