Mr Kurum, said they are still working to reach possible more survivors, but would not say how many more people are believed to be trapped inside the wreckage.
Experts from the Istanbul branch of the chamber of civil engineers who visited the site concluded that the "load-bearing columns had lost the capacity to carry the weight" of the building, the group said in a statement on Thursday.
Three people were been found dead after the structure fell, and three more were seriously injured, officials confirmed.
Istanbul Gov. Ali Yerlikaya said Thursday the search for survivors would continue "uninterrupted".
The incident was a stark reminder of the fragility of parts of Istanbul's residential infrastructure, with several buildings collapsing in recent years.
Surveillance camera footage of the moment of collapse which was shown on Turkish television showed people fleeing in terror as the building disintegrated, leaving a huge cloud of dust.
The death toll from a building collapse in Istanbul has climbed to 14 after several more bodies were recovered, Interior Minister Süleyman Soylu said Friday.
A seven-story building in Istanbul's Kartal district collapsed on Wednesday with some 30 residents inside.
He added that a textile workshop on the ground floor was operating without a licence. As the media look into the incident, it was discovered that the building's top three floors were built without proper documents and permit.
One four-storey structure crumbled past year following violent thunderstorms and in January 2017, two people died when another building collapsed in a working class part of town.