Carlos María de Castro (Estepa, 24 September 1810 - 2 November 1893) was a Spanish architect, engineer and urban planner. He created the plan of the urban expansion (Ensanche) of Madrid.Correos (2010) "Carlos María de Castro y ensanche de Madrid", retrieved 22 January 2019 The New Plan of Madrid was commissioned in 1857 and adopted in 1860.Luis de Sobrón Martínez and María José Muñoz de Pablo (2018) "Madrid's Expansion Palimpsest" in EGA: revista de expresión gráfica arquitectónica, Vol.23, No.33, pp.118-129. It was inspired by some technical aspects of Ildefons Cerdà's early studies and plans for the extension of Barcelona.Hall T. (1997) Planning Europe's Capital Cities. London: E&FN Spon., pp.144-157 But unlike Cerdà who sought to avoid social segregation, Castro proposed functional and social zoning.
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