The restoration of the headquarters of the Grand Priory of Lombardy and Venice, of the Sovereign Military Order of Malta, took place between 2014 and 2016 in the millenary historical seat in the heart of Venice, in the Castello district. The Priories of Lombardy and Venice, with those of Rome and Naples, constitute the Order’s three great Priories in Italy. The seat in Venice has been the heart of the Order’s properties in a considerable part of the Sestiere di Castello since medieval times. Today, the complex, with its church accessible from Salizada San Giovanni, its monumental garden, rich archives, library, the Priors flat, reception rooms, association spaces, exhibition spaces, and the headquarters housing the World Health Order, is an extraordinary piece of the City of Venice, whose property, considerably extended, has remained unchanged over the last millennium. The monumental complex, which dates to the tenth century, is legally protected under Legislative Decree No. 42 of January 22, 2004 (cultural heritage and landscape code), had been in a precarious state of conservation for some time, with restoration work underway but not yet completed. The Order immediately expressed its firm desire to intervene in the Church of San Giovanni del Tempio, which also houses the famous 1506 painting by Giovanni Bellini depicts the baptism of Jesus. The building was in a precarious and worrying condition, especially due to the infiltration of rainwater from the roofing: this condition favored the development of deterioration phenomena in the plasterwork, the cantinelle ceiling, the organ chancel area in the counter façade and the altar (Sovereign Military Hospitaller Order of St. John of Jerusalem of Rhodes of Malta in Along life's crusader. Marsilio, pp. 28–35, 2000, passim). After the restoration work began in 2013, the complex organization of the construction site made it possible to work effectively on several issues at the same time, implementing a continuous and timely comparison between the figures in charge of design, construction management, artistic management, the competent Superintendency, and the technical management of the site. Choices and decisions were fully shared starting from a model of teamwork, also based on the use of inspection reports, useful for keeping to the construction site schedule, facilitating the required administrative fulfilments. The unforeseen presence of the wooden roofing of Venetian workmanship, datable to the fourteenth century, concealed by a false ceiling, required a profound revision of the project initially fielded, also requiring a significant theoretical discussion, which we intend to account for in this contribution.