Question: The Lamborghini Portofino was a concept car by the chief designer of a company headquartered in what state?

Context paragraphs:
Lamborghini Estoque: The Lamborghini Estoque (] ) is a one-off Concept Car built by Lamborghini.  Unlike current production Lamborghini cars, which are mid-engine, two-seater sports cars, the Estoque is a four-door sedan.

Peter Schreyer: Peter Schreyer (born 1953) is a German automobile designer for Hyundai Motor and Kia Motors, widely known for his design contributions to the Audi TT.  He has been the chief design officer at Kia Motors since 2006 and on 28 December 2012, was named one of three presidents of the company.  He is currently the chief designer at Hyundai-Kia and works with Luc Donckerwolke, former design director of Volkswagen Group - Bentley, Lamborghini and Audi from 2016.  In 2006, Car Design News called the Audi TT one of "the most influential automotive design in recent time".

Lamborghini Asterion: The Lamborghini Asterion LPI 910-4 (LPI is an abbreviation for "Longitudinale Posteriore Ibrido") is a concept car manufactured by Lamborghini, which was unveiled in the 2014 Paris Motor Show.  The car is named after a Minotaur called Asterion and was to be Lamborghini's first hybrid car.  The half man – half bull Minotaur was chosen keeping in mind Lamborghini's tradition of naming their cars after a bull while alluding to its usage of different modes of power.

Forged composite: Forged composite is a technology that uses carbon fiber composite material and was developed jointly between Lamborghini and Callaway Golf Company who introduced it in their Sesto Elemento concept car and Diablo Octane drivers, respectively.  The application of this technology was originally developed at the Automobili Lamborghini Advanced Composite Structures Laboratory (ACSL) in Seattle, WA, where the Lamborghini-Callaway partnership was initially formed.  This partnership, along with forged composite technology, was announced at the 2010 Paris Motor Show when Lamborghini unveiled its concept car.  The United States trademark for forged composite was filed on July 13, 2010, in the category Toys and Sporting Goods Products.

Chrysler Atlantic: The Chrysler Atlantic was a retro concept car created by Chrysler.  It was first shown in 1995.  The Atlantic was designed by Bob Hubbach and inspired by the Bugatti Atlantique.  The idea for this car began out as a sketch on a napkin by Chrysler's president Bob Lutz in early 1993 and also involved the automaker's chief designer, Tom Gale.

Lamborghini Portofino: The Lamborghini Portofino was a concept car developed for Lamborghini by Kevin Verduyn, one of Chrysler's chief designers.  Introduced at the 1987 Frankfurt Auto Show, it was a fully functional, four-door, four-seat sport sedan.

Chrysler: FCA US LLC (also called Fiat Chrysler or Chrysler) ( ) is the American subsidiary of Fiat Chrysler Automobiles N.V., an Italian controlled automobile manufacturer registered in the Netherlands with headquarters in London, U.K., for tax purposes.  FCA US is one of the "Big Three" American automobile manufacturers.  FCA US has its headquarters in Auburn Hills, Michigan and sells vehicles worldwide under its flagship Chrysler brand, as well as the Dodge, Jeep, and Ram Trucks.  Other major divisions include Mopar, its automotive parts and accessories division, and SRT, its performance automobile division.

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.

Lamborghini Flying Star II: The Lamborghini Flying Star II (also named Lamborghini 400 GT Flying Star II) was a prototype concept car built by Carrozzeria Touring in 1966 on a Lamborghini front engine chassis.

Zagato Raptor: The Zagato Raptor, sometimes referred to as the Lamborghini Raptor, is a concept car design created in 1996 by Zagato in partnership with Alain Wicki for Lamborghini.  The body features the Zagato "double bubble" design and an innovative door design where the whole middle section of the car swivels up and forward.  The chassis is borrowed from a 4WD Lamborghini Diablo.  The design was completed and a sample vehicle displayed at the Geneva Auto Show in 1996.  At the time of showing, it was believed that the car was ready for production.

Supporting paragraphs: Lamborghini Portofino Chrysler
Answer: Michigan