What's in a $22 Million 1 Bedroom Condo? 

This might very well be the world’s most expensive one-bedroom condo. The penthouse of the 10-story exclusive residence building “The House Minami-Azabu,” located in the Tokyo district of the same name, is listed with Japan’s Sotheby’s International Realty for 1.8 billion yen, or approximately $22 million.

The average cost for an existing Tokyo condominium this size in February was $1.982 million, according to data from the Land Institute of Japan. Although there’s only one bedroom, the apartment is larger than many freestanding houses, at approximately 4,400 square feet. It’s loaded with amenities and features that would astound design lovers, foodies, and clothes horses.

A representative from Sotheby's Japan declined to release the name of the sellers to CNBC.com.

The sellers, who purchased it new in 2004, have spent 1 1/2 years renovating it, with custom furniture by Ceccotti Collezioni (not included), a painting made on-site by artist Hiroshi Senju, and imported Italian stone and wood for the walls, floors and doors. The living room with modern fireplace converts into a media room with an automatic retractable projector.

A ryotei-style dining room (modeled after traditional exclusive restaurants of Japan) allows the chef to bring food from the professional-grade kitchen directly to the diners. There’s also a casual dining room and an everyday eat-in kitchen with pantry.

Outdoor spaces include the central courtyard garden and a Parisian-style terrace overlooking Arisugawa Park.

The master bath has a raised Jacuzzi in the large shower room with 60-inch TV and private outdoor views. There are also two partial baths.

This penthouse boasts clothing and shoe storage dramatically surpassing any found in typical apartment dwellings. The shoe storage, which can store 200 pairs, is separate from the sprawling walk-in clothes closet. The shoe closets are concealed behind wall panels in the long entry hall in order to accommodate the Japanese custom of taking shoes off in the house.

The same sellers also have on the market a $6.8 million country house and a $16.1 million beach house featuring lights that illuminate the crashing waves at night.