Ali Yerlikaya added that 13 people have been injured so far.
It comes after Turkey's emergency management agency, AFAD, warned in August that up to 30,000 people could be killed in Istanbul if a magnitude-7.5 quake hit, with an estimated collapse of 44,802 buildings.
The injured are being treated at Kartal Training and Research Hospital, Yerlikaya said.
At least three people have been found dead in the rubble of the eight-story apartment building that collapsed in Istanbul, while 12 others were pulled out with injuries, officials said on Thursday.
Overnight, emergency services also rescued a 9-year old boy. Rescue teams are responding to voices from the debris and continuing efforts to reach the survivors.
The building had 14 apartments with 43 people registered as residents.
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Cevizli local headman Memiş Dikilitaş told Turkish broadcaster NTV that there was no explosion before the collapse, noting that the building, which was old, collapsed on its own. She was carried to a waiting ambulance on a stretcher with her neck in a brace, as one person in a crowd of onlookers chanted "God is great!"
CCTV footage has captured the dramatic moment when a multi-storey building collapses in Istanbul, Turkey on Wednesday.
"It was built in 1992 as a five-story building but three more stories were added later illegally", he said.
Rescuers are seen at the site of a collapsed residential building in the Kartal district, Istanbul, Feb. 7, 2019.
One four-storey structure crumbled previous year following violent thunderstorms and in January 2017, two people died when another building collapsed in a working class part of town.
A textile workshop on the building's lower floor was empty at the time, local official Zeki Dag told local media earlier.