Question: The Mitsubishi Diamante was designed by the company that has headquarters in what part of Tokyo?

Context paragraphs:
Uni-ball: Uni-ball and Uni are brands of pens and pencils, made by the Mitsubishi Pencil Company Limited (三菱鉛筆株式会社 , Mitsubishi Enpitsu Kabushiki Gaisha ) of Japan.  Mitsubishi Pencil Company distributes products in over 100 countries through subsidiaries, such as Mitsubishi Pencil Company UK.  Sanford (a division of Newell Brands) distributes uni-ball in the United States and Canada, Faber-Castell does so for Germany, and Linc Pen and Plastics Limited (LPPL) in India.  Despite its naming and the near identical logomarks, Mitsubishi Pencil Company is unrelated to the Mitsubishi Group, and has never been a part of their zaibatsu.

Mitsubishi Magna: The Mitsubishi Magna is a mid-size car that was produced over three generations between 1985 and 2005 by Mitsubishi Motors Australia Limited (MMAL).  Developed as a replacement for the Mitsubishi Sigma, each Magna generation derived from Japanese platforms re-engineered for the Australian market and conditions.  Initially, Magna offered inline-four engines in a mid-size sedan package—a station wagon debuted in 1987.  Over the years, each new series grew in size, and with the second generation of 1991, the range was bolstered by a luxury variant called Mitsubishi Verada and a V6 engine.  The Magna/Verada became the first Australian-made vehicle to be exported worldwide in large numbers, predominantly as the Mitsubishi Diamante.  The third and final iteration Magna/Verada launched in 1996, adding all-wheel-drive (AWD) from 2002, and receiving a substantial styling update in 2003.  They were replaced by the Mitsubishi 380 in 2005.

Mitsubishi RPM 7000: The Mitsubishi RPM 7000 is a concept car designed by the Cypress, California Design Studio of Mitsubishi Motors and exhibited at the 2001 North American International Auto Show.  Displayed alongside the Mitsubishi ASX, the two vehicles represented the company's vision for sporty, stylish crossover SUVs.  However, while the ASX defined Mitsubishi's production plans, the RPM 7000 was a more radical styling exercise and an overt celebration of the company's motorsport heritage.  The World Rally Championship-winning Mitsubishi Lancer Evolution and the Dakar Rally-winning Mitsubishi Pajero provided the engine and drivetrain, while chief stylist Mike Desmond acknowledged the influence of Formula One in the "nosecone" front grille and hood.  Elements of rallying and GT racing were also incorporated.  Other unusual elements included the teardrop silhouette, side exit exhaust pipe, and the suicide doors on the passenger side only.

Mitsubishi Diamante: The Mitsubishi Diamante is a car manufactured by Mitsubishi Motors between 1990 and 2005.

Mitsubishi Motors: Mitsubishi Motors Corporation (Japanese: 三菱自動車工業株式会社 , Hepburn: Mitsubishi Jidōsha Kōgyō KK ) is a Japanese multinational automotive manufacturer headquartered in Minato, Tokyo, Japan.  In 2011, Mitsubishi Motors was the sixth biggest Japanese automaker and the sixteenth biggest worldwide by production.  From October 2016 onwards, Mitsubishi is one-third (34%) owned by Nissan, and thus a part of the Renault–Nissan–Mitsubishi Alliance.

Mitsubishi Motors Europe: Mitsubishi Motors Europe (MME) is the European headquarters and sales, distribution subsidiary of the Japanese automotive manufacturer Mitsubishi Motors.  Their headquarters are in Born in the Netherlands.  Formerly, they had production facilities in Born, Netherlands (opened in 1991 and sold to NedCar in 2012), and from 1999-2008 they contracted production to Pininfarina in Turin, Italy.  The European design studio Mitsubishi Design Europe (MDE) and the research and development center Mitsubishi R&D Europe (MRDE) are based at Trebur in Germany, while Mitsubishi Motors Motor Sports (MMSP), responsible for the company's record-breaking success in the Dakar Rally, work out of Pont-de-Vaux, France.  The company oversees 2,500 dealers in 36 countries.

Mitsubishi Chemical Holdings: Mitsubishi Chemical Holdings Corporation (株式会社三菱ケミカルホールディングス , Kabushiki-gaisha Mitsubishi Kemikaru Hōrudingusu ) (), is a Japanese company formed in October 2005 from the merger of Mitsubishi Chemical Corporation and Mitsubishi Pharma Corporation.  The company is based in Tokyo (1-1 Marunouchi 1-chome, Chiyoda-ku, Tokyo 100-8251) and is managed by Hitoshi Ochi.  It is one of the core Mitsubishi companies.

Mitsubishi Logistics: Mitsubishi Logistics, Inc. is a logistics company with its headquarters in Shinkawa, Chuo-ku, Tokyo.  It is a member of the Mitsubishi group and a participant of Mitsubishi Kinyokai and Mitsubishi Public Affairs Committee.

Mitsubishi Estate: Mitsubishi Estate Co., Ltd. (三菱地所株式会社 , Mitsubishi Jisho Kabushiki-gaisha , MEC) is one of the largest real-estate developers in Japan and is involved in property management and architecture research and design.  MEC owns Japan's second tallest building, the Yokohama Landmark Tower, as well as the Sanno Park Tower and Marunouchi Building in Tokyo.  Mitsubishi Estate has its headquarters in the Otemachi Building in Ōtemachi, Chiyoda, Tokyo.  It is one of the core Mitsubishi companies.

Mitsubishi Sigma: Mitsubishi Sigma is an automotive nameplate that was used by the Japanese automobile manufacturer Mitsubishi Motors between 1976 and 1996.  Mitsubishi has utilized the "Sigma" name on several different vehicles based on Mitsubishi Galant and Mitsubishi Diamante sold in various markets during this time.

Supporting paragraphs: Mitsubishi Diamante Mitsubishi Motors
Answer: Minato