With a total of 10 exclusive homes after a spectacular classic facade with more than 100 years of history, this magnificent duplex house represents the unique opportunity to be part of an unprecedented project in Spain. The historical importance of the property, protected by the historical heritage of Madrid; the comfort and luxury granted in its rehabilitation; its privileged location due to its proximity to the El Retiro Park and the cultural epicenter of the city and the perfect conjunction of art with architecture, achieved in collaboration with one of the greatest representatives of modern and contemporary art Carlos Cruz-Diez, make this, a unique initiative and The building is destined to become an icon of contemporary architecture and an authentic artistic heritage for the city of Madrid. Its privileged location in the neighborhood of Los Jerónimos, one of the most desired areas of the capital, could not be more accurate. Located in the well-known Art Triangle, it is close to the Prado Museum, the Reina Sofía National Art Center Museum and the Thyssen-Bornemisza Museum, all of them of recognized worldwide prestige. The ideal location to host a property that has, both in the homes and in the common areas, with the new works of the international artist Carlos Cruz-Diez. This is the artist's first project of this magnitude for a private building in Madrid and Spain. Located on the ground floor of the building, the exclusive house has a great entrance of natural light thanks to the large south-facing window. Within the main floor is the large living room and the living area, both with double height. The kitchen, fully equipped by Poliform and Gaggenau, has a large dining room. The rest area is located on the upper floor with two large en suite rooms, all with Poliform cabinets. The house also has the latest Bang & Olufsen home automation technology: blinds, video and audio system, security camera, video intercom, alarms, Lutron lighting. The building enjoys magnificent common areas including Health Club with water spa, Klafs Turkish bath, swimming pool and Technogym gym. Cellar, interior garden and spectacular interior design, technical and security alarms, concierge service and robotic garage. The Chromatic Setting that Carlos Cruz-Diez has created responds specifically to the configuration of the spaces of the Montalbán 11 building in Madrid. He has designed a tour made up of unique and unrepeatable pieces. The tour begins with a mural Mur d'Induction Chromatique à Double Fréquence that is transformed according to the distance of the viewer and the changes of the ambient light. This mural installed in the entrance lobby leads to the elevator from whose cabin the visitor will have the opportunity to contemplate an Ascenceur Chromointerférent that evolves along the way. Given the monotonous function of going up and down, Carlos Cruz-Diez has conceived a Chromointerférent that is not only modified with the course of the route, but also modified on each floor. To do this, he has designed eight different harmonies that constitute eight different paths to individualize each of the floors of the property. The tour ends in the apartments with an original Transchromie of 8 numbered specimens, designed in three different chromatic harmonies. In view of all these considerations and many more, the artist believes that the 'Crymatic Agreement' project meets all the conditions to turn the building, into an authentic artistic heritage for the city of Madrid.