sentences:  This cannot be attributed to its date of 1452, the year Michelozzo was charged with transforming the building from castle to villa.The first true Renaissance building, the Ospedale degli Innocenti in Florence, had been designed as early as 1419, and Michelozzo had proved his understanding of the new form in 1444 with his design for the ten-sided extension to Santissima Annunziata, Florence, inspired by a plan from the Roman temple of Minerva Medica.and between 1444 and 1460 he constructed the first of the 15th century Renaissance palazzos, the Medici-Riccardi for Cosimo de' Medici.