Mack (1974), together with Kurt Forster (1976) and Howard Saalman (1966) have interpreted the evidence differently, arguing that work on the unifing facade would have awaited the acquisition of the third property along the Via della Vigna Nuova and actually was stimulated by the engagement of Rucellai's son Bernardo to Piero di Cosimo de' Medici's daughter Nannina in 1461. According to this theory it could only have been after the betrothal, that the pairing of clearly identifiable Medici devices with those of the Rucellai in the friezes could have been permissible. The same is true for the Medici interlocking rings insignia that occupy the spandrels of the windows within the facade. That would postpone construction of the Rucellai facade to a date after 1461 and, thus, calls into question its primacy over the almost identical design used for the Palazzo Piccolomini (designed by Bernardo Rossellino 1459-62) in Pienza. Unlike the wrap-around, four-side facade of the Pientine palace, that applied to the front of the Rucellai residence is only applied to the side facing the Via della Vigna Nuova with only a small portion turning the corner into the narrow Via dei Palchetti.