Question: Where was the biggest department store which IBM Printer Model 4 headquartered? 

Context paragraphs:
Stockmann, Helsinki centre: The Stockmann department store is a culturally significant business building and department store located in the centre of Helsinki, Finland.  It is one of many department stores owned by the Stockmann corporation.  It is the largest department store in the Nordic countries in terms of area and total sales.  The store is known for carrying all the internationally recognised luxury brands, and Stockmann's enjoys a reputation as the primary high-end department store in Finland.  "Stockmannin Herkku", the food and beverage department located at the basement level, is renowned for the quality and choice of its foodstuffs.  The Stockmann logo represents a set of escalators, which are commonly, but wrongly believed represent the first escalators in Finland.  The first escalators in Finland were installed in the Forum department store, Turku (1926)

The SM Store: The SM Store (formerly known as SM Department Store) is a department store franchise run by SM Investments, the holding company of the SM Group.  SM Department Store now holds more than 30 branches located at cities and provinces in the Philippines.  SM Department Store became one of the top retail centers in the Philippines.

IBM Printer Model 4: The IBM Printer Model 4 was a dot-matrix point-of-sale printer launched in 1991.  It and its successor, the IBM 4610, are still used by retailers such as El Corte Inglés, Publix, Zara, and Ripley.  The printer was discontinued in 2005.

E. B. Colwell and Company Department Store: The E. B. Colwell and Company Department Store is a historic department store building located at 208 South Main Street and 211 South A Street in Monmouth, Illinois.  Local businessman Edward B. Colwell had the store built in 1904.  Architect J. Grant Beadle of Galesburg designed the three-story Chicago school building.  The store was Monmouth's only true department store; its main competitor, the Allen Store, was the largest dry goods store in Monmouth but was nonetheless smaller than the Colwell store.  Shoppers came to the store from throughout Warren County, and from elsewhere in western Illinois via car and interurban railroad.  The store's size and reputation allowed it to sell goods such as china under their own brand name, and it came to be known as "the Marshall Field's of western Illinois".  The store suffered a downturn during the Great Depression, and while Colwell's second wife kept it in business for many years, the couple sold their store in 1959.

El Corte Inglés: El Corte Inglés S.A., headquartered in Madrid, is the biggest department store group in Europe and ranks fourth worldwide.  El Corte Inglés is Spain's only remaining department store chain, as well as owner of several associated businesses, such as:

Beales (department store): Beales is an English department store chain, currently operating 29 branches.  The flagship store, Beales in Bournemouth, was established as The Fancy Fair by John Elmes Beale in 1881 and is currently the biggest department store in Dorset.

Görlitz Department Store: The Görlitz department store in Görlitz is one of the best preserved department stores from the beginning of the twentieth century.  It is built in the Art Nouveau style and was operated as a department store until August 15, 2009.  The city and a citizens' action group tried to revitalize the department store which in 2012 housed only a beauty shop.  In 2013, a private investor was found, who would like to obtain the facility as a universal department store, as the Department Store of Upper Lusatia (Kaufhaus der Oberlausitz , KaDeO) and thus a counterpart to the Berlin department store Kaufhaus des Westens (KaDeWe).

IBM 4610: The IBM 4610, also known as SureMark, is a famous thermal point-of-sale printer manufactured by IBM, launched in 1996.  It is used by major retailers such as Wal-Mart (in most countries, most notably United States and Mexico), Carrefour, Costco, Cencosud, Office Depot, Tesco, Best Buy, Chedraui, King Soopers (and Kroger affiliates), London Drugs and Soriana (Mainly formerly Gigante stores).  It had replaced the famous IBM Printer Model 4.

Selfridges, Oxford Street: Selfridges is a Grade II listed retail premises on Oxford Street in London.  It was designed by Daniel Burnham for Harry Gordon Selfridge, and opened in 1909.  Still the headquarters of Selfridge & Co. department stores, with 540000 sqft of selling space, the store is the second largest retail premises in the UK, half as big as the biggest department store in Europe, Harrods.  It was named the world's best department store in 2010, and again in 2012.

Printer driver: In computers, a printer driver or a print processor is a piece of software that converts the data to be printed to the form specific to a printer.  The purpose of printer drivers is to allow applications to do printing without being aware of the technical details of each printer model.

Supporting paragraphs: IBM Printer Model 4 El Corte Inglés
Answer: Madrid