There's about a dozen on Yonge between Carlton & Bloor. Almost all of them on the second floor. Most of them are easier to spot from across the street.
If the name includes Golden, Blossom, Moon and/or Lotus, it's Asian.
If the sign says Shiatsu and/or Tui-na, it's Asian.
Even if it just says Massage or Spa, there's a good chance that it's Asian.
I've had an average experience in several of them. None particularly good or bad.