Unique situation?

That’s with hugely-oversized 3/0 AWG conductors, though—85 mm², in European terms. In typical U.S. practice, the conductors would be the smallest size that has sufficient ampacity and gives a voltage drop of 3% or less. If we assume a 50 A branch circuit, for which the maximum permissible continuous load would be 40 A, and a length of 300 feet, the same calculator suggests 4 AWG (21 mm²) conductors, for 2.89% voltage drop. This is just an example, and there are several reasons a different size might need to be used instead.

I expect the condominium association would require the work to be done by a licensed electrical contractor (holding a California C-10 license) who would obtain the required city or county permit for the work and provide a certificate of insurance. They might also require a design prepared by a professional engineer.

As for the price, I wouldn’t try to estimate the job without having seen it, but on its face, $4,500 doesn’t seem unreasonable to me for such a project in a high-cost part of California, assuming it includes all labor, materials, taxes, and permit fees. A condominium building, especially one large enough to require a 300-foot branch circuit, is very different from a single-family dwelling.

 

In that case, maybe the condominium administrators can do the job, hiring specialists with all necessarry materials...

 

big job

 

Is there anyway the HOA can reassign parking spaces? Place and assign EV Parking spaces closest to the electrical distribution room. Get the HOA to kick in some $ and bury a larger trunk conduit to those spaces. This way future tenets interested in going EV won't have to run into the hurtles your currently going thru. Once the larger pipe is laid; it would simply be a matter of adding a sub-panel and pulling cable to the other parking spaces as demand requires it.

By the way; 4K is very reasonable in your neck of the woods - assuming it's properly permitted and licensed. Shuffling parking spaces should reduce your cost and enhance the property's value; though it may be a longer walk to your car

 

It seems that after all building and approval costs, you must also pay for insurance every year...

(3) The owner of the charging station, whether located within a separate unit or within the common area or exclusive use common area, shall, at all times, maintain a liability coverage policy. The owner that submitted the application to install the charging station shall provide the association with the corresponding certificate of insurance within 14 days of approval of the application. That owner and each successor owner shall provide the association with the certificate of insurance annually thereafter.

Sorry if I misunderstood, here is the source...

later edit
Is there a chance to convince HOA to become owner of the charging point? In that case, they will pay for all, and eventually will make some profit, from you an other neighbours...

 

This is probably no big deal. It may involve only a minor endorsement to the general public liability policy you likely already have as part of your "homeowner's policy" on your condo -- or your existing policy may already extend to your parking space. Check with your insurance agency.

The condo association is asking only for a certificate from your insurance carrier saying that you have insurance. Most carriers provide these certificates at no cost for for nominal fee for the clerical work. You may already be required to provide your condo association a certificate of insurance for your existing policy.

Insurance certificates may sound complicated but they're a routine service provided by your insurance company or agency.

Also, in the language quoted above, there is no mention of a minimum dollar amount of coverage or that the association be named as an additional insured. If they're not asking for these things, I wouldn't bring them up.