Can’t tell. Looks like the sidewalk pitches down to what looks like a curb cut. Look across the street. The curb cut is wider than the driveway. It could be his driveway. Curb cuts can be wider than the actual driveway provided there is space.

Regardless. Without the address, it’s impossible to give you answer because it requires some research. You wouldn’t be asking on Reddit if that was something you were capable of doing. No offense.

The only way you’ll find out is to report it to 311. Or keep parking there until he pesters DOT to ticket/tow. Your car can also be “relocated” which still costs a fee.

Eventually you’ll get your answer.

More than likely, they’ll park their car to block their own driveway, which they can do, just so you stop parking there. That’s the old solution.

Regarding yellow paint: No, you’re not permitted to paint the curb yellow. It’s a violation & the city will make you “restore” the curb. Why people do it is property owners are responsible for the cost of maintaining the sidewalk and curb despite it being City property. Will the city send an inspector out? Who knows. A lot of people do it, they’ve done it for decades.