how do i sue the city of new york for scratching my car when it was towed?

Small Claims Court. You may have to prove that the car was not damaged before they towed it.

Single Yellow Lines Parking on single yellow lines is permitted only outside the times of control that are applicable to that particular section of single yellow line. The times and days of control for a single yellow line will be shown on a plate adjacent to the stretch of single yellow line. If the time plate does not show any days of operation then the restriction applies for each day of the week. Note – Within a controlled parking zone (CPZ), the single yellow line restrictions normally have the same times of control as the controlled parking zone and are therefore not individually signed. The CPZ entry sign will show the hours of control that are applicable in that zone. However, if a particular section of yellow line has different hours of restriction from the CPZ hours, then a plate will show the alternative times of restriction. You should check where you parked - take photos if not properly signed. Then appeal.

You can try to cover your car by special car cover when you park your car outdoor. When you car was towed, it will protect your car, avoid be scratched.