First, call and report this to the building department and ask them to investigate/pull his permit.

Measure the length of the property bounty from the other corner and paint a line where the marker should be located.

The building officials will have a lot to say....

I am not rich...but I get off my ass everyday to make sure I am not broke!

Can we get the Mexican cartels to help us with our supply chain issues? They don't seem to have any trouble getting stuff from one place to another.