Which iconic structure in Chicago reflects Richard M. Daley's revitalization efforts?

Millennium Park is the structure that best reflects Richard M. Daley's revitalization efforts in Chicago. Under Daley's leadership as mayor, a significant focus was placed on transforming underutilized and neglected spaces within the city into vibrant public areas that encouraged community engagement and tourism. Completed in 2004, Millennium Park represents a major commitment to urban renewal and landscape architecture, incorporating modern designs while emphasizing public art, recreation, and natural beauty.

The park features iconic installations such as Cloud Gate, often referred to as "The Bean," and the Jay Pritzker Pavilion, which showcases Daley's vision to provide an accessible cultural space for residents and visitors alike. This transformation of the area near Grant Park not only enhanced the aesthetic appeal of Chicago but also stimulated economic growth and increased public interaction in the downtown area. In contrast, the other options, while significant in their own right, do not align as directly with Daley's specific revitalization initiatives.