Dawoodi Bohras. This included the replacement of al-Salimi's mihrab with a new marble mihrab and the reconstruction of the southern half of the exterior façade by replicating the preserved northern half. This renovation has been criticized for sacrificing some historic elements of the mosque, especially in its interior. Architecture The mosque has been called a "seminal" monument in the architectural history of Cairo. It is significant for two features in particular: the decoration of its façade and the design of its floor plan. Layout The mosque of al-Aqmar the first building in Cairo with an adjustment to the street alignment. The plan of the mosque of al-Aqmar is hypostyle, with an internal square courtyard surrounded by roofed sections defined by rows of four-centered arches. The prayer hall on the qibla side is three bays or aisles deep while the gallery on bay around the courtyard is one bay deep. Each bay is covered by a shallow brick dome. However, this type of roofing is not attested in other monuments of the Fatimid architecture. Therefore, it is likely that the mosque originally had a flat ceiling but that when Yalbugha al-Salimi restored it from ruin in the 14th century it was given these vaulted ceilings, which resemble the type of ceiling used in the Khanqah of Faraj ibn Barquq, a Mamluk monument from the early 15th century. The novelty of the floor plan lies in the facade's alignment with the street in contrast with its interior space, which remains oriented towards the qibla. In order to accommodate this difference in angle while still maintaining internal symmetry, the structure uses variations in wall thickness. Here, street alignment starts to play a pivotal role because al-Mu'izz Street – previously known as the Qasaba – was the most important avenue in the city and it's possible that the architects desired the mosque's façade to be in harmony with the adjacent Fatimid caliphal palaces. The mosque was also originally placed above a row of shops, but the street level has risen so much in the intervening centuries that these are now buried. The income from the rents of these shops contributed to the revenues of the waqf (charitable endowment) which maintained the mosque's operation and upkeep. This design is similar to the Mosque of al-Salih Tala'i, built by the Fatimids later in the same century, whose shops have been excavated and are visible today below