Neighbor jerking off all the time

I have a neighbor in the building across from me that spends his entire life it seems, playing video games, smoking weed or jerking off, I’ve seen him, my wife’s seen him, friends we’ve had over have seen him. I’m sure others have as well. I honestly think he’s just too lazy to close the blinds if he has them and assumes no one can see him? How do I get a hold of this dude to give home a heads up It’s a DT high rise across the street. Call the building, fly a drone over with a sign?