sentences:  It was abandoned in the 1930s, after the collapse of the minaret due to lightning, and the demolition of the Medrese.The conservation of the building dates from the 1970s, when it was extensively restored and studied in a ten-year effort by Cecil L. Striker and Doğan Kuban, who restored its twelfth-century condition.Moreover, the minaret and the mihrab were rebuilt, which allowed the mosque to reopen for worship.