"The sign depicted in the photograph is not an official street sign," said Streets Department spokesperson June Cantor, after examining an image of the sign. "We do not have, nor do we post 'no bike parking signs.' No other government authority is authorized to post such a sign."
D'Angelo's manager Michelle DiMatteo said her restaurant put the signs up.
"The purpose of the signs is so people can walk up and down the street," she said. "Bikes would sometimes get in the way of our valet and people parking their cars."
I do wish local businesses would actually survey their customers about how they actually arrive to their establishments. My guess - could be wrong! - is that they'd be surprised.