If legislation filed Wednesday with Metro Council is approved, LifePoint Hospitals Inc. would benefit from a 15-year property tax break related to plans to move its headquarters to Davidson from Williamson County. The break on real property taxes applies to a new seven-story headquarters and support center for the hospital chain and as well as 85% of an adjacent parking garage that developer Highwoods Properties plans at its Seven Springs development. LifePoint also is due a break on personal property taxes for roughly $50 million worth of computers, software and other equipment that will go into the data center that it plans at the new 203,000-square-foot office building.