The northeast side (facing the plaza) was designed by Antonio da Sangallo. Unfinished when the architect died in 1546, it was modified and completed under Michelangelo Buonarroti in 1549. Then the construction of the two lateral wings was assigned to Giacomo Barozzi da Vignola. Finally the southwest wing (facing the Tiber River), which was not part of Michelangelo's initial drawings, was designed by Giacomo della Porta and completed in 1589.
Two distinct entities occupy the building: the French Embassy in Italy (the embassy itself and the ambassador's residence) and the head office of the French School at Rome (Ecole Française de Rome in French), a French public institute of research in history, archaelogy and social sciences.
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