Well you do what you have to do... or want to do.

Once you rid yourself that theft in your neighborhood won't be an issue, then the only other thing I imagine will be at issue is corrosion or rust. For that I'd tell you the same as any that keep their bike inside and still have that issue. Keep your bike as clean an dry as you can so corrosion and rust don't start. If it gets wet, put a box fan in front of it so the air dries it quickly. Spray the unpainted metal parts with a light lube or other petroleum based preservative.

Still, I don't even keep my best bikes in the garage. I take them inside the house with me. Much easier to walk out the door with my bike, everything else and just hop on the bike as I exit the door of the house.

If space in the house were an issue, I might have to put my wife in a tent or gazebo outside! (just joking... don't ever tell her I said this) <grin>