Yeşilköy’s urban layout and remaining architecture reflect its cosmopolitan past. Up until the mid-20th century, the neighborhood had a heavily non-Muslim population, primarily consisting of Greek, Armenian, and Levantine communities. This left behind a stunning array of late-19th-century wooden mansions (yalı and konak) and distinct religious landmarks.
The Historical Core: Köyiçi Mahalle
The heart of old Yeşilköy is the Köyiçi district. Unlike many parts of Istanbul that underwent rapid high-rise modernization, Köyiçi still retains fragments of its grid-like street pattern, an indicator of its non-Muslim urban origins. Walking through these narrow streets reveals magnificent but weathered timber structures featuring classic Ottoman-Levantine architectural synthesis.
Late 19th-century timber architecture in old Yeşilköy. Quelle: Levantine Heritage Foundation
Architectural and Religious Landmarks
The Three Historic Churches: Reflecting the neighborhood's multi-ethnic history, you can find the Agios Stefanos Greek Orthodox Church, the Surp Stepanos Armenian Church, and the Italian Catholic Church closely situated within the core area.
Bezm-i Alem Valide Sultan Mosque: Built in the 19th century under the patronage of the Ottoman royal family, this mosque introduced Islamic architecture to the coast, completing the classic Ottoman mosaic of coexistence.
The Site of the Treaty of San Stefano (1878): This neighborhood was the epicenter of world geopolitics at the conclusion of the Russo-Turkish War (1877–1878). The historic Treaty of San Stefano, which radically redrew the borders of the Balkans, was signed right here in a shoreline mansion belonging to the prominent Armenian Simenoğlu family. While the original signing house has faced significant alteration over the decades, the historical weight remains tied to the area's geography.