Büyükdere Avenue Büyükdere Avenue Büyükdere Avenue () is a major avenue which runs through the districts of Şişli (Esentepe quarter), Beşiktaş (Levent quarter) and Sarıyer (Maslak quarter) on the European side of Istanbul, Turkey. It begins at Şişli Mosque and runs in an eastward direction partly under the viaduct of the inner-city motorway O-1 through Mecidiyeköy, Esentepe, until reaching Zincirlikuyu; where it joins with Barbaros Boulevard and turns northward passing through Levent, Sanayi Mahallesi, Maslak and by the Fatih Forest, ending at the Hacıosman Slope on the Sarıyer district border. Its total length is . From Zincirlikuyu to Maslak, it forms a
Commercial district In larger cities and towns there may be multiple commercial districts, often with more specialized functions. If a city has one large central area of offices and professional buildings, this is called the Central Business District or CBD (term used especially, but not exclusively, in Australian and New Zealand English), or downtown (North American English with the exception of Liverpool, England, who also uniquely use the term 'downtown' ). "CBD" and "downtown" usually refer to centrally located areas of a city and are of predominate importance within their city, which differentiates them from other commercial districts. The financial district of