In Spring 1461, after the foundation works had been completed, it was a close colleague of Alberti's, the engineer Giovanpietro Figino, who carried on with the works. It is unclear how many stairs should have reached the vestibule and where they were placed. It is clear that the lower part of the church was included in the original design. Fancelli was then no longer involved with the project, while Alberti provided fresh instructions. From 1470 onwards, progress on the church began to slow considerably. When Ludovico died in 1478, the impetus for the Prince's private church faded away altogether. In 1488, the church was transferred to the Lateran Canons. They then took charge of completing the cross. The bell tower was completed in 1569, although the church had already been consecrated in 1529. It is interesting to note that the loggia to the side of the church was also an original Renaissance design, albeit reworked in 1882.
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