Has anyone parked at the RTI so they could go to the ACC?

Going to the American Club tomorrow for lunch with friends and one asked if there is parking. He and I are both not members. From the ACC website:

The Club provides a total of 74 parking spaces.

Members must first register their vehicles with the Club. After this, they are required to display a valid “ACC” parking sticker provided by the Club prominently on their vehicle’s front windshield.

Parking space is also available at Radio Taiwan International (RTI) located next to the Club from Monday to Friday, 18:00 to 23:00, Saturday, Sunday and most public holidays from 07:00 to 23:00.

I took a quick look at the RTI website and did not find anything about parking there (well, duh). Has anyone parked there and is it free of charge?