"The father left the apartment [to go] shopping and then made a decision to play Pokémon Go in the street which took a little time before he returned home", Mr Molins said.
The father of the rescued child was arrested by Paris police and is being questioned about leaving his son unattended.
Emmanuel Macron congratulated Gassama for "an exceptional act" and said France would give him a job in the emergency services.
A man in the neighboring balcony was attempting to hold the child up before Gassama reached out with his right arm and pulled the child to safety.
According to CNN, Gassama says he was in the neighborhood to watch a soccer match at a restaurant when he noticed a commotion. The video below, in case you haven't seen it yet, shows Gassama scaling several stories without any kind of gear or precautions to assist him.More news: Update on Facebook App Investigation and Audit
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"I did it because it was a child", the paper quoted him saying.
Prior to his visit to the Elysee Palace, Mr Gassama had already been thanked by Paris mayor Anne Hidalgo in a telephone call.
French President Emmanuel Macron invited Gassama to the Elysee Palace on Monday where he presented the young man with a certificate and a gold medal for performing an act of courage and determination.
"When I come out and I look up there and I get the chills".
"We can only thank him and thank heaven he was so reactive", she told Antenne Reunion radio late on Monday. "I just climbed up and thank God, God helped me". But his older brother has lived in France for decades, and wants to join him there. The French president said authorities would work to "regularize" the economic migrant's paperwork.
For many, the question was how the 4-year-old boy had been able to climb over the balcony's railing in the first place.