In this Sept. 7, 2018 aerial photo, demolition work proceeds at the site where the first of a pair of 15-story apartment buildings, heavily damaged in last year's 7.1 magnitude earthquake, was torn down, as its sister building, right, awaits demolition, in the Doctores neighborhood of Mexico City. Bureaucracy and physical and legal hurdles have delayed demolition of hundreds of tottering structures, while in other cases owners carried out repairs that were purely cosmetic, masking damage that is likely to be revealed in the next quake. (AP Photo/Claudio Cruz), APTOPIX