Letters from 1485 reveal that the Sienese government wrote to Francesco di Giorgio to request that he return to his native city and embark on the design and construction of public buildings. He did return to the city in 1486 and began receiving an annual salary of 800 florins for his position as official city engineer in which he would inspect all engineering projects throughout Siena. Di Giorgio also completed artistic projects for the city, such as the candle-holding angel sculptures which he contributed to the altar at the Opera del Duomo.