There is one on floor 1 which has already been marked. They are both accessible without a keycard via the stairs.
1 pianos available:
3 pianos possibly no longer available:
Likely not available (last seen 5 months ago)
Likely not available (last seen 1 year ago)
Likely not available (last seen 4 months ago)
In the 4th floor. An electric piano with headphones.