Boston Lyric Opera is on the move. New England’s largest opera company, both loved and criticized in recent years for its staunch traditionalism, has launched a new and rather untraditional initiative called Opera Annex, promising one adventurous work a year outside of its home at the Shubert Theatre.
The first offering in this series, Britten’s “The Turn of the Screw,’’ opened Wednesday night in a new production at the Park Plaza Castle, a historic armory building never before used for opera. The vocal performances were among the best I have heard in any BLO production of recent years. This staging by Sam Helfrich fares less well, but the Opera Annex concept itself represents a major step forward for the company, taken at a time when plenty of arts organizations are responding to the economic downturn by scaling back on artistic vision.