sentence: starting from the late 1980s and early 1990s , with initial projects such as the sabancı center , yapı kredi towers , tat towers , metrocity towers and iş bankası towers , levent became a popular location for constructing new skyscraper ( mostly owned by turkish bank and conglomerates ) ; and one of the city 's major skyline clusters ( together with those of maslak and şişli on the european side ; and kozyatağı and ataşehir on the asian side of istanbul ) was formed in levent .