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The GTI / HI workspace is located on a 4500 m2 estate in Guadarrama, Province of Madrid, 50 km from the Capital of Spain, in a rehabilitated building whose foundations are those of the house of the road workers who by order Carlos III built the current road to Los Altos del León in the 18th century. The building was later used as a toll station in the nineteenth century and then in the twentieth century the Banus family attached a hermitage for private use. In the 90's the hermitage was de-fundamentalized and the building was rebuilt maintaining its exterior appearance to be later classified as a historical building of the Sierra de Madrid and acquired by the HI group for its headquarters.

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Welcome to our home

The GTI / HI workspace is located on a 4500 m2 estate in Guadarrama, Province of Madrid, 50 km from the Capital of Spain, in a rehabilitated building whose foundations are those of the house of the road workers who by order Carlos III built the current road to Los Altos del León in the 18th century. The building was later used as a toll station in the nineteenth century and then in the twentieth century, the Banus family attached a hermitage for private use. In the '90s the hermitage was de-fundamentalized and the building was rebuilt maintaining its exterior appearance to be later classified as a historical building of the Sierra de Madrid and acquired by the HI group for its headquarters.

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For Design Thinking workshops and occasions of its customers and friends, GTI / HI offers

La Errana Hermitage that has the following facilities:

• Salon of 33 m² for ceremonies or training programs.

• Pediment for children's activities or space to prepare catering.

• Possibility of horse riding and ponies from the door of the farm.

• Tents of up to 200 people and outdoor toilettes for rent.

For booking and further information, please contact us at

Ph: +34 627 559 920

@: info@greentransitioninstitute.org