Question: Renntech makes modifications for the company headquartered in what city?

Context paragraphs:
Konica Minolta: Konica Minolta, Inc. (コニカミノルタ , Konika Minoruta ) is a Japanese technology company headquartered in Marunouchi, Chiyoda, Tokyo, with offices in 49 countries worldwide.  The company manufactures business and industrial imaging products, including copiers, laser printers, multi-functional peripherals (MFPs) and digital print systems for the production printing market.  Konica Minolta's Managed Print Service (MPS) is called Optimised Print Services.  The company also makes optical devices, including lenses and LCD film; medical and graphic imaging products, such as X-ray image processing systems, colour proofing systems, and X-ray film; photometers, 3-D digitizers, and other sensing products; and textile printers.  It formerly also had camera and photo operations inherited from Konica and Minolta but were sold in 2006, including its SLR division to Sony, with Sony's Alpha series being its successor.

Mercedes-AMG: Mercedes-AMG GmbH, commonly known as AMG, is the high performance division of Mercedes-Benz.  AMG independently hires engineers, manufactures and customizes Mercedes-Benz AMG vehicles.  Mercedes-AMG is headquartered in Affalterbach, Baden-Württemberg, Germany.  AMG was originally an independent engineering firm specializing in performance improvements for Mercedes-Benz vehicles; Daimler-Benz AG took a controlling interest in 1999, then became sole owner of AMG in 2005.  Mercedes-AMG GmbH is now a wholly owned subsidiary of Daimler AG.

Gunsmith: A gunsmith is a person who repairs, modifies, designs, or builds guns.  This occupation differs from an armorer.  A gunsmith does factory level repairs, renovation (such as applying metal finishes), and makes modifications and alterations for special uses.  Gunsmiths may also apply carvings, engravings and other decorative features to an otherwise finished gun.  The environment in which all this takes place often varies depending on the specific locality, with some gun stores featuring one or a handful of individuals while others resemble large scale specialty shops.

Kent RO Systems: Kent RO Systems Ltd is an Indian healthcare products company headquartered in Noida, Uttar Pradesh.  It makes water purifiers based on the process of Reverse osmosis (RO) purification.  Over the years the company has diversified into other products such as air purifiers, vacuum cleaners, vegetable and fruit purifiers and water softeners.  The company exports to SAARC countries, Middle East, and Kenya.  It expects a contribution of 15% of total turnover to come from exports in the near future.  The company won the Golden Peacock Eco Innovation Award for its contribution in developing innovative water purifying technology and preventing environment degradation in 2007.

Renntech: Renntech is a Florida company established in 1989 by Hartmut Feyhl.  It is best known for performance modifications of Mercedes-AMG automobiles.

Caves of Faribault: The Caves of Faribault is an artisan cheese company headquartered in Faribault, Minnesota as a division of Swiss Valley Farms.  Utilizing sandstone caves to age cheese, the company makes a variety of raw milk products, including several styles of blue cheese, Gouda, and cheddar.

Heaven Hill: Heaven Hill Distilleries, Inc. is an American, private family-owned and operated distillery company headquartered in Bardstown, Kentucky that produces and markets the Heaven Hill brand of Kentucky Straight Bourbon Whiskey and a variety of other distilled spirits.  Its current distillery facility, called the Heaven Hill Bernheim distillery, is in Louisville, Kentucky.  It is the seventh-largest alcohol supplier in the United States, the second-largest holder of bourbon whiskey inventory in the world, the largest independent family-owned and operated producer and marketer of distilled spirits in the United States, and the only large family-owned distillery company headquartered in Kentucky (not counting the Brown-Forman Corporation, which is publicly traded but more than two-thirds family-controlled, or the Sazerac Company, which is family-owned but headquartered in Louisiana).

Robinhood Markets: Robinhood Markets Inc., or simply Robinhood, is a U.S. based financial services company headquartered in Palo Alto, California. <ref name="Re/code 9.23.14"> </ref> The company offers the Robinhood smartphone mobile app, which allows individuals to invest in publicly traded companies and exchange-traded funds listed on U.S. stock exchanges without paying a commission.  The company makes money from interest earned on customers' cash balances and margin lending.

Cheers Wines: Cheers Wines is a Chinese wine import company headquartered in Beijing with partner stores throughout China.  It is a WSET APP ("Wine, Spirit and Educational trust Approved Program Provider").  The company's slogan is "Cheers makes you smile".

The-Unreachables: The-Unreachables (hyphenated) is a UK-based fundraising company headquartered in London, UK.  The-Unreachables was launched in December 2014 with the aim of connecting celebrities with local and international charities to raise awareness and funds.  The company makes use of sweepstakes to run campaigns to raise funds for charities.

Supporting paragraphs: Renntech Mercedes-AMG
Answer: Affalterbach