Oceanwide Holdings Co. sold its San Francisco development site at a loss of about $276 million. : (Bloomberg)—China’s Oceanwide Holdings Co. has sold its San Francisco property project for about $1 billion, taking a loss on an ambitious development that was expected to include the city’s second-tallest office tower but has lain idle for months. The Oceanwide Center site, which includes offices, upscale condos and a Waldorf Astoria hotel, faced “huge challenges” on construction and cost controls, the company said in a filing to the Shenzhen stock exchange late Wednesday.