[7][2] The restoration, which Doğan Kuban attributes to the architect Seyit Mustafa Agha,[4][2] preserved the original mosque's appearance.

[8][9][10] The layout is based on that of the earlier Selimiye Mosque of Edirne from the classical period, in accordance with Mustafa III's wishes.

The walls make use of colorful variegated marbles in red, blue, yellow and browns, further decorated with medallions in opus sectile using also semi-precious onyx and jaspers.

Some of the structures of the Laleli Mosque's kulliye have disappeared over the years, but the mausoleum facing Ordu Street remains.

[citation needed] The interior is decorated with reused İznik tiles from the 16th century,[17] and a band of calligraphy encircles the upper walls.

In the graveyard next to the türbe is the tomb of Adilşah Kadın, set within an ornate bronze grille representative of Ottoman metalwork at the time.

[18]The waqf (endowment) of the complex also included a number of buildings throughout the city which provided revenues for the upkeep of the mosque and its külliye.