 In 1787 , José Damian Ortiz de Castro was in charge of finishing work on the cathedral . He did most of the work on the bell towers , putting in most of the fretwork and capping them with roofs in the shape of bells . With his death in 1793 , he did not live to see the cathedral completed , and Manuel Tolsá finished the cathedral by adding the cupola , the central front facade , the balustrades , and the statues of Faith , Hope and Charity at the top of the front facade . Tolsa 's work was the last major construction to the cathedral and the appearance it had when he finished is the basic look the cathedral has today . 
 In 1787 , José Damian Ortiz de Castro was in charge of finishing work on the cathedral . He did most of the work on the bell towers , putting in most of the fretwork and capping them with roofs in the shape of bells . With his death in 1793 , he did not live to see the cathedral completed , and Manuel Tolsá finished the cathedral by adding the cupola , the central front facade , the balustrades , and the statues of Faith , Hope and Charity at the top of the front facade . Tolsa <a href='null_genetive' title='1'><mark>'s</mark></a>work was the last major construction to the cathedral and the appearance it had when he finished <a href='drop_aux' title='2'><mark>is</mark></a>the basic look the cathedral <a href='uninflect' title='3'><mark>has</mark></a> today . 
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