Some time later, Sangallo was hired to build the foundation for the church of San Giovanni dei Fiorentini on the bank of the Tiber. Jacopo Sansovino's design called for the church to extend into the river, a difficult task given the unstable bank. Sangallo successfully completed the foundation, although at such great expense that there was no longer enough money to build the church. Thus the model that Sangallo designed for the church was not built, and construction to the designs of Giacomo della Porta was not begun until 1583.