>>Silver/Concierge Floor<<
Technically only Golds & Platinums get access, unless you book a room on that floor. I'm a Silver and have been given access to the floor (not a room on the floor) a few times by benevolent desk clerks.
It all depends on who you get. I am 8 nights from Gold, and just checked into the Denver Marriott Tech Center. I am booked for 17 nights, so I asked if I could be given access since technically I will turn Gold during the stay. The girl refused saying "You have to be Gold when you check in".
Luck of the draw I guess.
PF