At the beginning of 2005, Ayelet Mazar, from the Hebrew University of Jerusalem, began excavating in an area that had already been partially excavated by MacAllister and Duncan in the 1920s, in the place where the office of the visitor center in the City of David stands. She proposed that the remains discovered are the foundations of a large palace from the 10th century BCE., the time of King David. There is a great dispute raging among researchers regarding these remains, and the date of the structure and its interpretation are still not known with certainty. During the excavation, a number of ‘stamps’, seal impressions with Hebrew names on them were discovered. Continuing her work at the site, Mazar excavated a tower, part of the city wall from the beginning of the Second Temple, the days of Nehemiah, Governor of Judea.