Dear 100 Hour Board,
As a follow-up to Board Question #17746.
I found out recently that I was incorrect. The First Presidency and Quorum of the Twelve meet on the 4th floor of the temple (meaning, the 4th stop on the elevator). That entire floor is reserved for their use and includes a locker room facility for their use.
The Seventh floor of the temple consists of a few small rooms in the towers. They are rarely used, but were mentioned once in a talk by Elder Eyring.
I just wanted to clear things up.