Sections of tower crane are readied for assembly at One Grant Park.

The crane-building crane is on the scene.

The highs and lows of One Grant Park include below-grade core work, and preparations for building a tower crane. The tower crane base was planted Friday of last week, so the foundation has had time to set up properly. If I had to guess, I’d say they’ll put it together over the weekend. There’s plenty of room to work within the site, so street closures don’t seem likely.

Meanwhile, grab a stepladder and go watch the work at the east side of One Grant Park. Workers are deep down working on the elevator core. And they’re using fire!

Working down low on the core. Do you see fire?