You know, the more I see you say things like "don't get me shot," the more I want you to be. Don't play out old jokes.
In all seriousness, and as was already mentioned, there should be towing signs in your parking lot. If there weren't any, talk to the management company and ask them who the authorized towing agency is for your parking lot. When they tell you, call that company, and tell them you've wanted to get some people towed for illegal parking, but they have no signs in the parking lot, so you couldn't call.
Most likely, they will put up signs. There's money in it for them. If one person did it to you, other people are probably doing it to other tenants, and I'm sure they want someone to call too.
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