A gorgeous rendering of One Grant Park from Rafael Viñoly Architects.

When it rains, it pours. Cement into caissons, that is.

Add One Grant Park to the list of skyscrapers getting busy in Chicago. Permitted for foundation work back in October, the empty lot bounded by Michigan Avenue, Roosevelt Road, and Indiana Avenue finally saw some action in December, when crews started site prep. Now, the familiar blue and gold of Case Foundation is on the scene, drilling holes into the South Loop soil to support the 76-story, 792-unit Rafael Viñoly Architects design.

That foundation permit includes twelve (!) levels of parking, so we could see a lot of time and concrete trucks pass between now and the full building permit. But it’s all good; we can kill time running back and forth between One Grant Park and another McHugh Construction supertall in progress, Vista Tower.