Chicago construction, and the enthusiasts who enthuse it, needed this bit of news.

Saturday, the City of Chicago issued a permit to drill caissons for three tower cranes in Jackson Park at the Obama Presidential Center.

With only seven in the air now, three on one site, not only a rare feat in Chicago, would give us a nice jolt in the crane count.

Turner Construction is the general contractor on the Obama Center. W.E. O’Neil is the concrete contractor. Tod Williams Billie Tsien Architects — Partners is the design architect.

A groundbreaking ceremony was held on the site September 28.