A 42-year-old man was gunned down during an apparent music video shoot in a building in a Bronx housing project Wednesday night, police sources said.

The victim walked into the lobby of the Mill Brook Houses building on East 137th Street — past a crowd that appeared to be involved in the shoot — and headed toward the elevators when a man followed him, the sources said.

The suspect then opened fire, striking the victim multiple times in the torso and hip, cops said.

The gunman and the others in the lobby took off.

The victim apparently stumbled to the stairwell, where he was found unconscious around 9:45 p.m., and taken to Lincoln Medical Center. He died about a half-hour later.

The victim was not immediately identified pending family notification.