(INDIANA CAPITAL CHRONICLE) — A dispute over a downtown Martinsville building has escalated into a lawsuit filed by Indiana State Treasurer Daniel Elliott, who claims he and his wife were promised ownership of the property after investing roughly $250,000 in improvements. But the Elliots allege that promise was never fulfilled after a group of Morgan County nonprofits reneged on the agreement. The complaint, filed April 8 in Morgan County Superi…