What's That Noise at 1345 S. Wabash?

A reader writes:

I live near the construction site at 1345 and for this entire week, there's a drone noise that corresponds to the construction activity.  

Does anyone know what's causing this drone-type activity? It's worse than an airplane engine on a long-haul flight.  

And, aren't there rules/laws about this type of noise?

We haven't heard it, but aren't that close to this spot.  Anyone else hear anything?