In December 2009, Ayalon led high-level diplomatic discussions with the Holy See concerning Church properties and taxes, leading to an agreement in early 2012 between Israel and the Vatican in which the latter agreed to waive its demand to receive sovereignty over The Cenacle, the location of the Last Supper, on Jerusalem's Mount Zion. Israel, in return, agreed to consider giving the Church access to the site and is considering a leasing option. As part of the agreement, the Vatican will for the first time pay a reduced property tax for its large amount of assets in Israel.