Property Lines is hearing the owners of First Indiana Plaza are considering a sale of the struggling skyscraper. The 425,000-square-foot building is owned by New York-based Crown Properties Inc. The building's general manager, Julie Clements, said today she has no comment about a potential sale. The building has taken a beating on vacancy. It now has about 150,000 square feet vacant and could soon lose another 80,000 square feet if law firm Bose McKinney & Evans pulls the trigger on a move to Chase Tower.