The Santa Monica Airport, which the city has long tried to shut down while the aviation community has rallied to keep it open, will close for 10 days this month so the single 4,973-foot runway can be shortened. The shutdown will begin on December 13 and conclude on December 23, according to the airport website. The new runway will be just 3,500 feet long. Notams will be issued, and operators can find updated information on the airport website.
Source: avwebSMO To Close For Runway Shortening