Nashville-based HCA Holdings Inc. (NYSE: HCA) is creating more than 1,000 jobs as part of a major expansion in Davidson County, company and government officials announced Thursday. The hospital giant's expansion also will allow for construction to begin on Alex Palmer's 900,000-square-foot West End Summit, one of Nashville's highest-profile stalled commercial real estate projects, representing an investment of $200 million. Combined, the expansion of the two HCA units represents 2,000 jobs over five years. It is believed to be the largest creation of jobs in Nashville by one economic development project since the relocation of Dell in the early 1990s, and one of the largest in the region's history.