Question: In what city is the headquarters for the company which displayed the Tat Elagante as a concept car in 2007?  

Context paragraphs:
Concept car: A concept car (also known as concept vehicle, show vehicle or prototype) is a car made to showcase new styling and/or new technology.  They are often shown at motor shows to gauge customer reaction to new and radical designs which may or may not be mass-produced.  General Motors designer Harley Earl is generally credited with inventing the concept car, and did much to popularize it through its traveling Motorama shows of the 1950s.

Mako Shark (concept car): The XP-755 concept car, also known as the Mako Shark, was designed by Larry Shinoda under the direction of General Motors Styling and Design head Bill Mitchell in 1961, as a concept for future Chevrolet Corvette production cars.  In keeping with the name, the streamlining, pointed snout, and other detailing was partly inspired by the sleek, fast-moving shortfin mako shark.  The '61 Corvette tail was given two additional tail lights (six total) for the concept car.  The concept was inspired by Bill Mitchell's 1959 Stingray racer XP87 which also inspired the 1963 Corvette Sting Ray.

Volkswagen GX3: The Volkswagen GX3 was a concept car created by project Moonraker, which was initiated by Stefan Liske, former director of group product strategy at Volkswagen.  The GX3 was first shown at the 2006 Greater Los Angeles Auto Show.  It was considered a very unusual concept since it was three-wheeled and sometimes considered more of a motorcycle concept than a concept car; but it did feature great performance for a projected cost of only about US$17,000.

Tata Motors: Tata Motors Limited (formerly TELCO, short for Tata Engineering and Locomotive Company) headquartered in Mumbai, is an Indian multinational automotive manufacturing company and a member of the Tata Group.  Its products include passenger cars, trucks, vans, coaches, buses, sports cars, construction equipment and military vehicles.

Mercedes-Benz Ocean Drive: The Mercedes-Benz Ocean Drive concept car is concept car introduced in 2007.  The car is built on the S600 chassis (S600 is long wheelbase only).  In the Ocean Drive Concept, a V12 has been built, which together with 2 turbo's reaches a poweroutput of 517 bhp and 830 Nm of torque.

BMW CS Concept: The BMW CS Concept is a concept car was first displayed by the German car manufacturer BMW in 2007 at the Shanghai Auto Show.  BMW claimed that CS Concept could be produced, following positive initial comments in 2007 by BMW dealers.  This was followed up in 2008 by an announcement by BMW that the concept goes into production in the form of the BMW Gran Turismo.  BMW later cancelled in November 2008 because of financial reasons.

Tata Elegante: The Tata Elegante is a concept car that was displayed by Tata Motors during the 2007 Geneva Motor Show.  It is rumoured to contain many design cues which will be found on the next generation Tata Indigo.  The Elegante is designed to use a 4-cylinder engine between 1.4 and 2 litres and a compact v6 petrol engine.

Volkswagen Concept BlueSport: The Volkswagen Concept BlueSport is a mid-engined roadster concept car produced by Volkswagen.  It was introduced at the 2009 North American International Auto Show in Detroit.  The Concept BlueSport follows on from a previous roadster concept car, the Volkswagen Concept R, shown at the 2003 Frankfurt Motor Show.

Kia Sportspace: Kia Sportspace is a concept car developed by Kia Motors Europe and showcased at Geneva Motor Show 2015.  Kia Sportspace the four seater concept car was made to make long journey more comfortable.  The concept car was designed at the company's Frankfurt design studio.

Ford Mustang: The Ford Mustang is an American car manufactured by Ford.  It was originally based on the platform of the second generation North American Ford Falcon, a compact car.  The original 1962 Ford Mustang I two-seater concept car had evolved into the 1963 Mustang II four-seater concept car which Ford used to pretest how the public would take interest in the first production Mustang.  The 1963 Mustang II concept car was designed with a variation of the production model's front and rear ends with a roof that was 2.7 inches shorter.  Introduced early on April 17, 1964 (16 days after the Plymouth Barracuda), and thus dubbed as a "1964½" by Mustang fans, the 1965 Mustang was the automaker's most successful launch since the Model A.  The Mustang has undergone several transformations to its current sixth generation.

Supporting paragraphs: Tata Elegante Tata Motors
Answer: Mumbai