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The answer really depends on whether you are looking at this from an insurance point of you or a court point of you.
From a court point of view, you hit a stationary object so most likely you will be responsible, however, he was parked in a no parking zone. You will have to prove that the no parking zone is there due to the fact that there is no room for coming out of the driveway and not for other safety reasons (such as being able to drive through), and then you may be able to hold him contributorily liable.
So if he sues you for the damages, you may only be responsible for partial damages.
If you report this to insurance, they will probably hold you 100% at fault but they will pay out the claim, but your premium will probably go up.
But again, they will also do an investigation and if they can prove that the no parking zone is there for room purposes of being able to get out of the driveway, then they may get some money back but your premium will still probably go up.
My best advice is to negotiate with him.
Tell him the most you're able to pay him and tell him that the no parking zone is there for a reason so he's responsible for
He'll probably take it because it costs money and time to sue you and many people don't want to do that without knowing the outcome.
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