By Steve Lackmeyer Business Writer slackmeyer@oklahoman.comDowntown’s Union Bus Station is the first building to be torn down among nine set to disappear as site work begins for the future 499 W Sheridan tower. It was the only planned demolition on the block bounded by Main Street, Sheridan, Hudson and Walker Avenues to be challenged in court, although the challenge was unsuccessful. The demolition by Midwest Wrecking started Saturday, one day after the developer, Texas-based Hines, received a permit from City Hall.Read more on NewsOK.com