The luxury hotel in central Tokyo began selling the plan a week ago as "something splashy" to commemorate its opening five years ago, said hotel spokeswoman Chie Hayakawa. It intends to apply for recognition from Guinness World Records once a reservation is finalized.
"When the hotel opened we had an exclusive party like this - black tie, cocktail dresses. There was music and drinks and food from the restaurants, and it was all quite grand," said Hayakawa, who took part.
"We thought it would be fun to offer the same experience to an exclusive group of guests."
Under the plan, the entire hotel - 178 guest rooms, all nine restaurants and all spas - would be reserved from 3:00 in the afternoon to noon the next day. It would include a cocktail reception for 500 people.
The price tag is 55 million yen ($671,800)..
"The only thing is, you have to pick a date where there are no reservations already," she added. "It's not as if you could just request it for later this week."
