In case it isn't obvious I also wanted to make sure that no one tries to use the wheelchair lift to move the piano into the ballroom. Its not rated for that weight and would probably break it..
If we can get the other piano tuned, at some point one of the pianos should ideally go into another room - one of the basement rooms might eventually be best (though getting it down the stairs does not seem fun) as per the thought / plan of turning one of the offices there into a rehearsal / recording room, so people can still play even if the ballroom is in use -