I lived in the city for about six years. You can be ticketed for parking on the sidewalk...period. That said, lots of people do it, and they are lucky that their neighbors don't call parking enforcement on them. It was a $100 ticket when I lived there, and I'm sure has only gone up. Parking on the street is a gamble, but it's probably your only option unless you can find a neighbor with a garage space for rent. But, if it's your daily transport, and your building doesn't have a garage to begin with, you're probably SOL. If you can use a disc lock, I hear those are the biggest visual deterrent to theft available. Otherwise, use two big locks to keep your bike from rolling, and try to keep the chains off the ground. Thieves can use the ground as leverage for bolt cutters if the chain is low enough. As previously stated, keep a spare set of plugs, and a plug wrench handy, and I wish you the best of luck.