The Basilica Palladiana is a Renaissance building in the central Piazza dei Signori in Vicenza, north-eastern Italy. The most notable feature of the edifice is the loggia, which shows one of the first examples of the what came to be known as the Palladian window, designed by a young Andrea Palladio, whose work in architecture was to have a significant effect on the field during the Renaissance and later periods.
The building was originally constructed in the 15th century and was known as the Palazzo della Ragione, having been designed by Domenico da Venezia to include two pre-existing public palaces. The building, which was in Gothic style, served as the seat of government and also housed a number of shops on the ground floor. The 82 m-tall Torre della Bissara (or dei Bissari) precedes this structure, as it is known from as early as 1172; however, it was elevated in this occasion, and its pinnacle was finished in 1444. It has five bells in chord of E. The 15th century edifice had an upside-down cover, partly supported by large archivolts, inspired by that built in 1306 for the eponymous building of Padua. The Gothic façade was in red and gialletto marble of Verona, and is still visible behind the Palladio addition.
A double order of column was built by Tommaso Formenton in 1481-1494 to surround the palace. However, two years afeter its completion, the south-western corner crumbled down. In the following decades Vicentine government called in architects such as Antonio Rizzo, Giorgio Spavento, Antonio Scarpagnino, Jacopo Sansovino, Sebastiano Serlio, Michele Sanmicheli and Giulio Romano to propose a reconstruction plan. However, in 1546 the Council of One Hundred selected a young local architect, Palladio, to reconstruct the building starting from April 1549. Palladio added a new outer-shell of marble classical forms, a loggia and a portico that now obscure the original Gothic architecture.
The Basilica was an expensive project (some 60,000 ducats once finished) and took a long time to complete. Palladio received for the work an income of 5 ducats a month during most of his life. In 1614 - thirty years after his death - the building was completed, with the finishing of the main façade on Piazza delle Erbe.
Drawings by Palladio, leading from his original proposal of 1546 to the final construction, have been preserved. His solution, which also encompasses the necessary measure to adapt the addition to the pre-existing structure, is based on the so-called serliana: this is a repetitive structure in which the round arcades are flanked by two rectangular openings; the latter were of different size, in order to match the variable size of the internal bay. In the angular arcades, the architrave openings become very narrow. The serliana had been already used in the Veneto some years before by Jacopo Sansovino for his Biblioteca Marciana (1537), as well as in the reconstruction of the Polirone Abbey by Giulio Romano (1540).
The loggias in the lower floor were in Doric order; the associated entablature has a frieze which alternates metope (decorated by dishes and bucrania) and triglyphs. The uppoer floor loggias are instead in Ionic order, with a continuous frieze entablature.
Since 1994 the Basilica has been protected as part of a World Heritage Site along with the other Palladian buildings of Vicenza. The building now often hosts exhibitions in its large hall used for civic events.
A large restoration project started in 2007. 
- "Basilica Palladiana in Vicenza". Retrieved 10 April 2012.
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