I did a quick search and it looks like
this is another company in the same building:
Aoyama Compal Bldg. 1F
3-1-7 Minami Aoyama Minato-ku,
Tokyo 107-0062, Japan
So maybe you could write your address:
Avex Artist Planning & Development
Aoyama Compal Bldg. 5F
3-1-7 Minami-Aoyama, Minato-ku
Tokyo 107-0062
JAPAN
This is just a guess, but it looks pretty good to me.
