Pulitzer Prize-winning Chicago Tribune architecture critic Blair Kamin praised the decision to have architects design the pavilions as an "inspired stroke", speculating that if their designs had been left to contractors, visitors to Millennium Park could have instead seen unimpressive "blunt utilitarian huts".
Kamin was pleased with Piano's South Pavilions, describing them as "minor modernist jewels, almost house-like".
He lauded the way their limestone walls complement the transparent glass by way of contrast, and noted that they anticipated Piano's then-forthcoming addition to the Art Institute of Chicago Building.
Kamin gave the South Pavilions a rating of three stars out of a possible four, or "very good".

Kamin was less pleased with Beeby's North Pavilions, which he described as "nearly all black and impenetrable" and compared to Darth Vader's helmet.
He acknowledged the pavilions' innovative technology, and their "urban design function" as wings for the Harris Theater, which Kamin felt "allows the theater to better stand up to the Frank Gehry-designed Pritzker Pavilion to its south".
Because they were not finished when he wrote his review in July 2004, Kamin did not give the North Pavilions an overall star rating; he did express the hope that they would have a more pleasant appearance once completed.

The pavilions have been recognized for their innovative use of renewable energy and green design.
In 2005, the North Pavilions received the Leadership in Energy and Environmental Design (LEED) silver rating from the United States Green Building Council.
They received a Technology Award Honorable Mention in the category of "Alternative and/or Renewable Energy Use – New Construction" from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE).
The United States Department of Energy has recognized all the pavilions as part of its Million Solar Roofs Initiative.
In 2005 Chicago ranked fourth among U.S. cities in solar installations; the completion of the Exelon Pavilions took the city to a total of 1 MW of installed photovoltaic systems.
The pavilions together generate 19,840 kilowatt-hours (71,400 MJ) of electricity annually, worth $2,353 per year at 2010 average Illinois electricity prices.
According to the City of Chicago, this is enough energy to power the equivalent of 14 Energy Star-rated efficient houses in Chicago.
Pulitzer Prize-winning Chicago Tribune architecture critic Blair Kamin praised the decision to have architects design the pavilions as an "inspired stroke", speculating that if their designs had been left to contractors, visitors to Millennium Park could have instead seen unimpressive "blunt utilitarian huts". Kamin was pleased with Piano's South Pavilions, describing them as "minor modernist jewels, almost house-like". He lauded the way their limestone walls complement the transparent glass by way of contrast, and noted that they anticipated Piano's then-forthcoming addition to the Art Institute of Chicago Building. Kamin gave the South Pavilions a rating of three stars out of a possible four, or "very good".
Kamin was less pleased with Beeby's North Pavilions, which he described as "nearly all black and impenetrable" and compared to Darth Vader's helmet. He acknowledged the pavilions' innovative technology, and their "urban design function" as wings for the Harris Theater, which Kamin felt "allows the theater to better stand up to the Frank Gehry-designed Pritzker Pavilion to its south". Because they were not finished when he wrote his review in July 2004, Kamin did not give the North Pavilions an overall star rating; he did express the hope that they would have a more pleasant appearance once completed.
The pavilions have been recognized for their innovative use of renewable energy and green design. In 2005, the North Pavilions received the Leadership in Energy and Environmental Design (LEED) silver rating from the United States Green Building Council. They received a Technology Award Honorable Mention in the category of "Alternative and/or Renewable Energy Use – New Construction" from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). The United States Department of Energy has recognized all the pavilions as part of its Million Solar Roofs Initiative. In 2005 Chicago ranked fourth among U.S. cities in solar installations; the completion of the Exelon Pavilions took the city to a total of 1 MW of installed photovoltaic systems. The pavilions together generate 19,840 kilowatt-hours (71,400 MJ) of electricity annually, worth $2,353 per year at 2010 average Illinois electricity prices. According to the City of Chicago, this is enough energy to power the equivalent of 14 Energy Star-rated efficient houses in Chicago.
Exelon Pavilions