In these tax records, the location of property is defined by naming adjacent features be they streets or buildings. Mack, thus, was able to reconstruct ownership histories for the site now occupied by the palace for each of the of the years in the fifteenth century in which a tax was levied. What Mack discovered substantiates Giovanni Rucellai's own testimony that "out of eight houses, I made one". Eight individual dwellings did, in fact, once occupy the site of the present Rucellai Palace.