The Baltimore Development Cooperative took home the $25,000 Sondheim Artscape Prize on Saturday. On Saturday, the Baltimore Office of Promotion & The Arts, acting in conjunction with Baltimore’s Artscape festival, hosted an opening at the Baltimore Museum of Art to announce the Sondheim Artscape Prize — the Mid-Atlantic region’s most prestigious art awards. Baltimore Mayor Sheila Dixon was on hand to announce the winner of the prize: the three-artist-team known as the Baltimore Development…