@Lloyd
How would they know what to charge you if you are on the building meter? The EV owner would have to keep tabs on electric used in the parking space and self report/pay for use. The law says the cost must be "reasonable" and leaves it up to the HOA and the EV owner to come to terms. Do you have any other legal info?
http://luskin.ucla.edu/sites/default/files/EV%20Charging%20in%20LA%20MUDs.pdf
"In summary, S.B. 209 mandated that CCRs that effectively prohibit or “unreasonably” restrict installation or use of EVSE are “void and unenforceable”.51 “Reasonable restrictions” are those that do not “significantly increase the cost or decrease its efficiency...”52 Approval or denial of a request to install or charge, if approval is neces- sary, must be provided within 60 days.53"
You know how many miles you drive, and how may Kwh's you use per mile. I'd say if you can come to terms with what you actually use to within 25% that's a deal. It is a problem when you are dealing with a common meter. The people paying the bill for the common don't want to be on the short side of subsidizing your driving. That's going to be their fear. You have to assure your HOA that you're not going to use more than you are paying for. This will be new for them so you will have to educate them.
If you do 90% or more of your charging at home like I do, why not allow the HOA access to your odometer, and pay them for use on 100% of your miles driven. The small penalty for charging away from home is a small fee to pay to make them feel comfortable with EV's charging on the common meter. Just a thought.
Another idea is to install a metering device in line with your EVSE or plug. If you do most of your charging off peak rates, negotiate a rate closer to the discounted rate. Someone posted earlier that these meters were available for ~$200 I believe.
Run a separate service and your own bill. Lots of fees and monthly meter fees as well.