Legal Question in Insurance Law in Michigan

Re: Car damaged by unknown in parking lot of employment.

You are probably out of luck. Whoever is in charge of the parking lot -- and it may be neither your employer nor the building management company -- would only be liable if they caused the accident, whether intentionally or negligently. They are not guarantors of the safety of your car from careless drivers; in other words, if another driver hits you it's his/her fault and not the parking lot's. The managers of the lot don't have to pay you for something that isn't their fault unless they have previously accepted such responsibility -- and few sane managers would do that.

Also, most parking lots expressly disclaim liability, either in a long-term contract or on the ticket stub you receive upon entering the lot. Some of these clauses might well prove unenforceable, but even if you can get past the disclaimer you will still have to prove that the company is at fault, and nothing you said in your question suggests that you can prove this.

I'm afraid you are probably going to have to eat the deductible on this one.