S.F. construction slows to a crawl

Much can be learned about the San Francisco real estate market by taking a quick look at 10th and Market streets.

A high-rise condominium tower was supposed to be built on the excavated lot to the south. Across the street, a new - and still empty - 20-story tower, originally designed as condos, was unsuccessfully put up for sale during the second half of 2008 and now is marketed as rental apartments.