210.25 prohibits branch circuits from one dwelling to supply common area lighting.

Yup, I missed that one. Shows how much multifamily I do. [Linked Image]

I assumed that the owner would occupy the unit with the lights on his meter. Even if this were allowed what happens if the unit gets sold?

I agree with the others- either split the lighting up and put it on the respective meters or provide a house meter. I think which way to go would depend on the layout and where the lighting is located. I don't think any unit should be paying for site lighting.

-Hal