The latest official guide I can find
http://www.gib.gov.tr/fileadmin/beya...payers2010.pdf published Feb2010 for tax year 2009, suggests that if claiming using the 'Deduction of expenses in the actual expenses method' then yes:
Interest of debts relating to the rented property and rights and
5% of acquisition value of a rented house for 5 years beginning
from the date of acquisition (This deduction applies only to
rental income of the rented house; non-deductible part is not
evaluated as expenditure surplus. This deduction is not valid for
houses acquired before 2005.)