Over the decades since 1970 , this metropolitan area has become more economically and socially integrated with the Mexico City metropolitan area . Many people from Mexico City own second homes there for weekend retreats , both for the climate and for the well-developed infrastructure . Starting in the 1980s permanent migration of Mexico City residents began , spurred by pollution and crime problems in the capital . The 1985 Mexico City earthquake also pushed many well-to-do families there , fearful of the next catastrophe . In many of these cases , the main breadwinner commutes each day to work in Mexico City . This has produced a considerable increase in housing developments on the outskirts of the city , especially in the late 1990s and 2000s . This influx has had a positive economic benefit for the city but has put pressure on the infrastructure as well . 85 % of the city of Cuernavaca is dedicated to housing , and much of this is in middle-class housing developments such as '' Rancho Cortés , Rancho Tetela '' , and '' Colonia del Bosque '' , which are located on the outskirts of the city . Lower-income housing is concentrated in the city proper
1985 Mexico City earthquake
1985 Mexico City earthquake
Cuernavaca