That whole corner was covered over with plywood when I was in Venice - they were cleaning or repairing that section of St. Mark's and.. I'm going to say the loggia that connects it with the Doge's Palace.

Another thing that happened on that trip was that I suffered through the whole tour through the Pitti Palace, only to find that the Titian I was looking forward to had been removed for cleaning! (Icon is the Titian.)