U.S. homebuilding increased more than expected in November and permits for future home construction surged to a 12-1/2-year high.Lower mortgage rates continued to boost the housing market and support the broader economy.Housing starts rose 3.2% to 1.365 million units last month, with single-family construction racing to a 10-month high.Activity in the volatile multifamily sector increased for a second straight month, the Commerce Department said.