NEW YORK – Every morning when I walk out of the elevator on the 30th floor of the iconic GM building, I see giant glass windows on each side of the corridor, through which I can get a nice view of the city and Central Park. The office, which has been newly renovated, is very spacious and bright. Most of the office furniture is in silver, white or gray. The corridor and the rooms are partitioned by frosted glass walls and doors. All of the design speaks of a central value of the firm: transparency.