A land purchase in Litchfield County is aimed at preserving open space. The 30 acres that are being purchased by Steep Rock Association will mean a new trail overlooking 65-foot-high rock cliffs. The nonprofit land trust has been awarded a state grant of $406,250 that will go toward the purchase of the land on the Washington and Warren town line. The grant is part of a total of $37 million in state funding aimed at preserving 1,025 acres of open space in 14 communities throughout Connecticut.