A man was busted for tossing cinder blocks Sunday off a Greenpoint roof – a block away from the New York City Marathon, cops said.

The 38-year-old suspect threw four blocks off the top of 236 Newell St. in Brooklyn around 12:30 p.m., striking and damaging three unoccupied vehicles, cops said.  

The man was taken into custody, and reckless endangerment charges were pending against him, police said.