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Squatting in Albania began on a large scale in the 1990s after the fall of communism, with internal migration towards formerly collectivised farmland establishing informal settlements. One such area, Bathore on the periphery of the capital Tirana, had 40,000 squatters by the early 2000s who successfully campaigned for better amenities. Other squatters occupied severely polluted post-industrial sites. The Agency of Legalization, Upgrading, and Integration of Informal Zones and Buildings (ALUIZNI) had legalized 16,500 homes on 152 settlements by 2009. As of 2020, 25 per cent of the population of Albania's cities lived in informal settlements.