Acrosefrom the square are the back streets of Laleli, the place to look for low-priced clothes.
The only place where cheap clothes can be obtained is on Laleli's back streets. 
mnli hypothesis: The only place where cheap clothes can be obtained is on Laleli's back streets.  premise: Acrosefrom the square are the back streets of Laleli, the place to look for low-priced clothes.