The 10-story building, called “Yunus Apartment,” was said to have had construction permit for only the first three floors, with the upper floors having been built illegally.
Turkey’s Environment and Urbanization Minister Murat Kurum and Istanbul Governor Ali Yerlikaya were at the scene for the demolition works.
The eight-story building in Kartal collapsed on Feb. 6.
A total of 35 people were believed to have been trapped under the wreckage, Turkey’s Interior Minister Süleyman Soylu said on Feb. 9.
While 14 people were rescued from under the rubble, 21 died.