Mehmed II’s conquest (29 May 1453) ended Byzantine rule and initiated an Ottoman program of repopulation, administrative reorganization, and major building works that reoriented the city’s civic and religious landscape.
Soon after the conquest, Mehmed II began building the Eski Saray (Old Palace) in the Beyazıt area, establishing a new political center within the walled city before the later shift to Topkapı.
A major early Ottoman sacred precinct was established at Eyüp around the tomb of Abu Ayyub al-Ansari, helping anchor Ottoman religious legitimacy and creating a new pilgrimage-focused urban node along the Golden Horn.
Mehmed II ordered a new imperial palace on the Sarayburnu promontory; Topkapı became the empire’s principal administrative and ceremonial complex, expanding over subsequent reigns.
The Cevahir (İç) Bedesten, commissioned by Mehmed II, formed the nucleus of what grew into the Grand Bazaar, consolidating secure, covered commercial space central to Istanbul’s post-conquest economy.
Completed in 1464 for Grand Vizier Mahmud Pasha, this was among the first purpose-built Ottoman mosques within the city walls, reinforcing the development of a new Ottoman civic-religious center near key market streets.
As part of the Mahmud Pasha complex, the hamam (1466) supported urban services and neighborhood growth, reflecting the Ottoman use of endowed public works to structure everyday city life and commerce.
Built 1463–1470 by order of Mehmed II, the Fatih Külliye replaced the Church of the Holy Apostles and introduced an imperial-scale complex model (mosque, madrasas, and charitable facilities) that reshaped the city’s skyline and institutional geography.
Constructed 1501–1506, the Bayezid II complex became a prominent monumental anchor in the city center and remains one of the earliest preserved imperial mosque complexes in Istanbul after 1453.
Commissioned by Hürrem Sultan and designed by Mimar Sinan, the Haseki Sultan Complex (mosque 1538–39, with madrasa, imaret, and later hospital) exemplified imperial patronage that integrated worship with education and social services.
Commissioned by Süleyman I and completed in 1548, the Şehzade complex marked a key stage in the maturation of classical Ottoman architecture and strengthened the monumental corridor of the historic peninsula.
Founded in 1550 and inaugurated in 1557, Sinan’s Süleymaniye Külliye combined monumental architecture with educational, charitable, and service institutions, transforming the Third Hill into a major imperial focal point.
Sinan’s Mağlova Aqueduct (part of the Kırkçeşme water-supply works) strengthened Istanbul’s hydraulic infrastructure, addressing the growing capital’s demand for reliable water through large-scale engineering.
Work began in 1563 and finished by 1570 (per manuscript evidence); the mosque’s prominent hilltop siting near the land walls extended monumental Ottoman building toward the city’s edge and served as a major urban landmark.
Established in 1577 under Murad III, the observatory represented an ambitious state-backed scientific institution in the capital, including instruments, workshop capacity, and a library—an unusual form of elite ‘public work’ within Istanbul’s built environment.
Built 1578–1580 by Mimar Sinan for the grand admiral Kılıç Ali Pasha, the mosque anchored a broader complex in the port district, reflecting late-16th-century investment in waterfront neighborhoods tied to imperial naval power.
The observatory was destroyed on 22 January 1580, curtailing the institution after only a brief period of activity and illustrating how court politics and religious anxieties could directly reshape the capital’s urban-scientific infrastructure.
Istanbul Urban Development after the Conquest (1453–1600)
