I'm so sorry, that is terribly unfortunate. It is also shame the property wasn't grandfathered. I'm wondering if you couldn't perhaps seek a variance or, simply stop the ramp long before his property, since you say it is long enough to be an "L".
If none of the above is possible, without an easement, you've no legal standing to restrict his right to build this fence, UNLESS he is building it on your property. (You may be able to negotiate one with him, or contracting with him on a monthly basis to keep an opening in that fence available - money talks,and he may be willing to listen.)
It sounds like it would have to also get permission for your customers to park in his parking lot, which is another thing he probably was annoyed at.
Lastly, consider learning (quietly!) if his fence is in violation of any local zoning requirements, such as certain footage in from the property line. If there is a certain 'setback' required, he could be in violation and would have to move his fence. While I wouldn't rat him out immediately (if you learn he is violating), you may be able to use it to your advantage in negotiating that right to have your ramp empty into his parking lot.
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