The Dearborn Street entrances were reopened and their massive granite lintels and surrounds cleared of layers of black paint or replaced. A source was found for the molded bricks needed to repair or replace the curved corners. Large plate glass windows at the entrance were removed and smaller double-hung windows were replaced that conformed to the original design. Fiberglass shades resembling the original linen versions were installed to preserve the appearance of the facade. The average cost of the restoration work was $1 million per floor ($ in dollars) in 1989, or $47 per square foot ($505.92 per square meter).