I haven't researched the law on towing. But, I would expect that it's implied that a towing company may tow an improperly parked car. If you are over the white line, it sounds as if your car is occupying two spaces. I doubt the tow company or apartment complex will be sympathetic to your claim. Perhaps, another tenant complained about your car being in two spaces, which may've compelled the aprtment complex to take action (especially if parking spaces are at a premium).