ZEIS maps: Comparing areas to be earmarked exclusively for social housing in São Paulo city

The Special Zones of Social Interest (Zonas Especiais de Interesse Social – ZEIS) are urban areas specifically earmarked under municipal law for social housing purposes. ZEIS maps demarcated under São Paulo city’s Master Plans – 2002 and 2014 – were examined to quantify the changes over the years and to provide starting point data to evaluate of the limits and the possibilities for further socioeconomic and legal analysis. The zoning impacts were assessed by numeric and cartographic comparison using the available socioeconomic maps and reports produced by the municipality. A post-occupation (a posteriori) zoning (ZEIS type 1 representing 9.4% of municipal area) followed the expansion of the informal settlements, thus providing a first step for assessing the land tenure, while a pre-occupation (a priori) zoning (ZEIS types 2, 3, 4 and 5 representing 2.3% of municipal area) is an important measure for designating land for social housing purposes, even if they do maintain the segregated occupation pattern on the periphery. Upgrading programs have been disappointing, considering the amount of informally occupied land; similarly, property regularization in the land registry offices reveals a lack of political priority and rare provision of public goods and amenities. For vacant land, determining the social function of property remains a challenge because less than 10% of land use intended for social housing projects was implemented as planned. Housing deficit and inequality remain as complex problems. Obviously ZEIS as a zoning tool is still unable to make the fairest occupation processes possible, not being an isolated solution, but if it is used correctly with other innovative measures and housing solutions, satisfactory results can be achieved.