Regardless of the place you have rented, it does not change the rule that the deposit fee you will pay for the m² and other features cannot exceed the total of 3 months' rent. This is clearly stated in the Code of Obligations, where the amount you have to pay for the deposit is 3 months' rent. The statement in the law is “If the tenant is obliged to assure the tenants sure residences and roofed workplaces, this assurance can not exceed the rent for three months.” is in the form.
For example, for a house rented with a monthly amount of 231.73 USD (4,000 TL), the highest deposit that the landlord can demand cannot be more than 815.20 USD (12,000 TL).