AUGUSTA — The state is entering negotiations with a Virginia firm and a Maine contractor in hopes that a deal can be struck to tear down the vacant former state Department of Transportation maintenance facility on Capitol Street and build a nearly 90,000-square-foot office building in its place. If the parties can agree to terms, the new building would be leased back to the state to serve as the new main office for the state Department of Health and Human Services. The 9.2-acre property at 109 Capitol St.