The Twin Kiosk / Apartments of the Crown Prince (Çifte Kasırlar / Veliahd Dairesi) consists of two privy chambers built in the 17th century, at different times. The building is connected to the palace and consists of only one-storey built on an elevated platform to give a better view from inside and shield views from the outside.
The interiour consists of two large rooms, dating from the reign of Sultan Murat III, but are more probably from the reign of Ahmed I. The ceiling is not flat but conical in the kiosk style, evoking the traditional tents of the early Ottomans. As in tents, there is no standing furniture but sofas laid out on the carpeted floor on the side of the walls for seating. These chambers represent all the details of the classical style used in other parts of the palace. The pavilion has been completely redecorated and most of the Baroque woodwork has been removed.
The decorative tiles, reflecting the high quality craftsmanship of the İznik tile industry of the 17th century, were removed in accordance with the original concept and replaced with modern copies. The paintwork of the wooden dome is still original and is an example of the rich designs of the late 16th/early 17th centuries.
The crown prince (Şehzadeler) lived here in seclusion, therefore the apartments were also called kafes (cage). The crown prince and other princes were trained in the discipline of the Ottoman Harem until they reached adulthood. Afterwards, they were send as governors to Anatolian provinces, where they were further trained in the administration of state affairs. From the beginning of the 17th century onward, the princes lived in the Harem, which started to have a voice in the palace administration. The Twin Kiosk was used as the privy chamber of the crown prince from the 18th century onward.