The shooting was reported outside the Boulevard Houses on Stanley Avenue in East New York just before noon.
Police say the 31-year-old victim worked at the city-run complex and was shot on his way to lunch.
He was pronounced dead at Brookdale University Hospital.
Based on the nature of the shooting, detectives are operating under the assumption he was targeted.
They are looking through the victim's background, but at this point, they do not have any obvious motive.
The victim does not have a criminal history.
The owner of Thanasi Electrical Company said 15 electricians were on site. The victim, a skilled electrician, was hired in June and working in one of the construction containers preparing a panel board.
His employer said he was always on time, liked to run and keep to himself.
In December, he was injured working at another construction site, in Manhattan, after an apparent air pressure tank explosion.
Police are still searching for the suspect who was described as wearing all black and a ski mask.
No arrests have been made, and the investigation is ongoing.
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