FLORENCE — Palazzo Gucci officially opens Monday, revisited through the lens of artistic director Demna and defining a new chapter for the storied building. Located within the historic Palazzo della Mercanzia, it is a landmark dating back to 1337 in Florence’s Piazza della Signoria, a few steps away from the Uffizi Gallery. The palazzo serves as the luxury house’s cultural destination, with the new Gucci Storia project unfolding across the building’s first and second floors. The ground floor hosts a dedicated boutique, alongside Gucci Osteria da Massimo Bottura, with Gucci Giardino — the all-day café and cocktail bar — nearby in the square. “Palazzo Gucci, to me, embodies the importance of this house in Italian culture,” said Demna, who joined Gucci from Balenciaga in July last year. “It’s where I first understood this when I went to visit the Uffizi Museum.…