Istanbul Bufe appears to be a Turkish establishment. One search result mentions "İstanbul Büfe" with a specific address in Bakırköy, Istanbul, and another refers to "Fener Büfe Tekel" in Kadıköy. A third result lists "Açık Büfe Restoranları" in the Fener and Balat regions, suggesting a buffet style of dining might be associated with some establishments of this name.