please note: i know nothing of this location at all so i cant really guage anything decent as a helpful reply, but i do think that parking on the sidewalk is a bad idea. you'd be more likely seen as a protestor or something silly like that, and you'd probably be forcibly removed. at least parking in a "parking spot" even though you are not a car, you'd have some sort of right to be there. cars can pay for parking valet, why not a bike on rollers? they'd for sure make a stink about blocking a sidewalk before they asked someone who paid for a valet ticket to leave, ya know? safer bet.