Yes, I cleaned up and changed clothes in the handicap stall close to my desk per my reply above. The ladies rooms were cleaned late at night and were in pristine condition for my 7am arrival. I was careful to leave them as clean as I found them to avoid antagonizing some "concerned" management/facilities liasons - no drips splashes or loose hair. The handicap stall has much more elbow room than a regular one. My sink shampoo was fully dressed.

The ground floor restroom had a "sitting area" that I used AFTER work to change into my cycling apparel. It was close to the building exit and appropriate since I didn't need my cleanup kit kept at my desk.