The mean may be ~ 90 feet, but I doubt the median is. Lots of big hills, and lots of near sea-level flats. The article specifically talks about Mission Bay as a

The mean may be ~ 90 feet, but I doubt the median is. Lots of big hills, and lots of near sea-level flats. The article specifically talks about Mission Bay as an ideal place for development - it's all land reclaimed from the bay.