Builders of the Royal Bank of Canada's historic Old Montreal headquarters probably never envisaged ceiling to floor glass enclosing its Roman-inspired grand banking hall. But after RBC departs next year, the heavy pink drapes will come down from the original arched windows, sending daylight through the glass cubicles and wall to be put up in the opulent hall.

For years we've heard how commercial and industrial buildings can be LEED-certified, signifying high standards of environmental or "green" construction. But did you know homes can now also be LEED-certified?