Responding to Yong Meng's request to post the photos of the Bosendorfer grand piano...which has 9 extra keys.. I played on it in 2006 in Toronto. This piano cost C$238,000 back then (see the price tag!). The extra 9 keys are in black in the last photo.
Is this the Bosendofer 290 Imperial model?
Absolutely ... (it says so on the white card). Want to buy one for Pianovers Meetups? :)
Lol, the extra keys will be under-utilised.