A statement , issued by Azeri Embassy to Tehran, deplored over human fatality in the wake of the trade building's fall.
So far, Russia, Pakistan, Turkey, Spain, Serbia and Belarus have extended condolences on the incident, according to IRNA.
Iranian government on Friday announced one day of public mourning over the tragedy.
Saturday (January 21) will be the day of public mourning, cabinet said in a statement released on Friday.
Praising the sacrifices of firefighters in protection of people's life, the government offered condolences to the bereaved families of firefighters and wished recovery for the injured.
Head of Iran's Emergency Medical Services, Pir-Hossein Kolivand, said on Thursday that following the collapse of the Plasco Trade Center many firefighters are feared dead.
The fire in Plasco Trade Center, which is one of the biggest in the Iranian capital, collapsed Thursday morning as the fire started in the seventeen-storey business building in the early hours of Thursday, despite efforts by Tehran firefighters to stop it.
A center for making apparel, the Plasco center soon was engulfed in a big fire that caused the collapse of a wall in the building's northern side and its final total collapse.
EghtesadOnline: The Republic of Azerbaijan on Friday condoled Iranian government and nation on the tragic Plasco Trade Center fire and collapse, which killed or injured tens of Iranians, especially firefighters, on Thursday, January 19.