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The three-story Simon building houses local offices of the Internal Revenue Service, the Social Security Administration, the Drug Enforcement Administration, and Rep. Jerry F. Costello and Sen. Richard J. Durbin, Illinois Democrats. It’s named after Paul Simon, the late U.S. senator from Illinois.

The building project also is profiled on the GSA’s website, though no mention is made of the origin of solar panels.

The memo highlighting the expenditures from the inspector general was sent to two GSA officials. The first was Robert Peck, the former Public Buildings Service commissioner who was one of several executives ousted earlier this year when details surfaced about the GSA’s lavish Las Vegas conference in 2010.

The second official to receive the memo, Steven J. Kempf, was named commissioner for the GSA’s federal acquisition service in 2010, but he took a two-month medical leave earlier this summer. He came under scrutiny after recent revelations about another roughly quarter-million-dollar employee awards ceremony also held in 2010.