I saw Bianca the other night, and she was great. She greeted me with DFK as soon as I came in the door and all throughout the session. Everything was very GFE, with BBBJ, DATY, and obviously CFS. She's good friends with Sierra, and the session was similar to hers (though I've only seen Sierra once). I think a duo with them would be hot.
As far as the whole agency experience, it's pretty much as imthedude described. I wanted to see Sierra but she was fully booked (thanks a lot dude), so Samantha recommended Bianca, as she often does with me at the spa. The booking process went smooth and was the same as any other agency.
I didn't notice any parking warning signs, but I didn't see any parking stations or gates or anything. The elevators are straight ahead from the entrance and you have to walk past reception, but these days just wear a mask and winter hat and nobody will notice you.