Maslak United States) constructing with steel costs more than constructing with concrete. The reason for choosing steel was its relative strength in resisting earthquakes (Istanbul is located along an active fault), whereas concrete is more fire-resistant. The stations "İTÜ-Ayazağa" and "Atatürk Oto Sanayi" along the M2 line of the Istanbul Metro serve the Maslak business district and its surrounding neighbourhoods. One of the five campuses of the Istanbul Technical University, the Ayazağa Campus, is located in Maslak. Maslak Maslak is one of the main business districts of Sarıyer, Istanbul, Turkey, located on the European side of the city. It was formerly
Ionia Downtown Commercial Historic District the city, serving travelers arriving by railroad. Much of the building stock in the district was built starting around this time, as Ionia grew in the late ninetheenth century. The Ionia Downtown Commercial Historic District covers nearly all of Ionia's central business district, and includes buildings which were constructed primarily in the late nineteenth and early twentieth centuries. Eighty-five structures are included in the district, of which seventy contribute to the historic nature of the district. These buildings are primarily commercial, although the district does include some residential, religious, and governmental buildings. The commercial blocks stand side-by-side, directly on the