 It was a challenging task, as the lower level already had three doorways and six Gothic niches containing tombs and employing the polychrome marble typical of Florentine churches such as San Miniato al Monte and the Baptistery of Florence.The design also incorporates an ocular window which was already in place.Alberti introduced Classical features around the portico and spread the polychromy over the entire facade in a manner which includes Classical proportions and elements such as pilasters, cornices and a pediment in the Classical style, ornamented with a sunburst in tesserae, rather than sculpture.