"The Grand Prince Hotel Akasaka was an upscale hotel in Chiyoda, Tokyo, Japan. It was located across the moat from Akasaka-mitsuke Station, and next to the back of the Hotel New Otani in Kioicho. Following closure it became notable for being deconstructed in a top-down approach, the building appearing to shrink in height over time." -Wikipedia
More info link is a video not to be missed.