The United Nations Educational, Scientific and Cultural Organization (UNESCO) designated Hadrian's Villa as a World Heritage Site in 1999. The designation specified the boundaries of the site and created a buffer zone around it in which no new construction was permitted. In 2011, the communal government of Tivoli announced plans, later cancelled, to build a waste dump in the vicinity of the villa and approved the construction of public housing on 120,000 sq. meters within the buffer zone. At its 36th Annual Meeting, UNESCO formally addressed these encroachments on the site. While they commended the Italian government for its decision to abandon the construction of a waste dump in the Corcolle area, the committee requested the government “to inform the World Heritage Centre in due time about any major development project planned in the buffer zone of the property, including the housing development at Comprensorio di Ponte Lucano, for which a Heritage Impact Assessment should be included, in accordance with Paragraph 172 of the Operational Guidelines, before any irreversible commitment is made.” UNESCO also requested “the State Party to submit . . . an updated report on the state of conservation of the property,” by February 2014, reflecting concerns over the deterioration of the exposed ruins.