The last letter is lowered into place at the top of the 41-story Kemper Building at State & Wacker in downtown Chicago. (22-Apr-12)

A Sikorsky twin-turbine helicopter picks up a part of a new sign that is now installed at the top of the 41-story Kemper Building in downtown Chicago. (22-Apr-12)

A Sikorsky twin-turbine helicopter carries part of a new sign over State Street in downtown Chicago. (22-Apr-12)

A new sign sees its first sunset at the top of the 41-story Kemper Building in downtown Chicago. (22-Apr-12)

A Sikorsky S-58T twin-turbine helicopter, piloted by Jim Triggs of Midwest Helicopter Airways, over State Street in downtown Chicago. (22-Apr-12)

The letter U is removed from the Unitrin sign at the top of what is now the Kemper Building. (15-Apr-12)

The letter U, removed from the Unitrin sign, is deposited on Wacker Drive in front of what is now the Kemper Building. (15-Apr-12)

The letter N leaves the dismantled Unitrin sign at the top of what is now the Kemper Building. (15-Apr-12)

Letters from the dismantled Unitrin sign are deposited on Wacker Drive next to the other discarded letters. (15-Apr-12)

Smith & Wollensky from State Street Bridge. East tower of Marina City in background at right. (08-Apr-12)