The former Hatvany-Deutsch mansion down in Eötvös Street has, for the past 80 years, served as the embassy of Spain and the ambassador's residence. The restoration of this building aimed to create a more practical separation of offices and private quarters, establish new offices in the attic, and implement a general overhaul of this individually protected, historic building. Representative spaces on the ground floor (entrance hall, parlors, dining room, and kitchen) were linked to an undeservedly neglected court, the redrafting of which was an eminent task. The first-floor functions as a family residence for the ambassador in power, whereas the basement and the second floor contain administrative offices. Both the street front and the courtside wing, completed in 1880 and 1906, boast original pavements, cut-glass surfaces, and valuable interiors. The restoration plan was elaborated with meticulous work considering the demands of both the ambassador and embassy employees, the results of detailed surveys and ongoing consultations on landmark preservation, and the budget allocated by the Spanish Ministry of Foreign Affairs. During the long process of projecting and rehabilitation, I worked with architect Adam Sylvester. The restoration project was awarded with the quality-prize ICOMOS.