Muay Thai, Portland, OR??

A friend of mine is looking to start training Thai boxing and is looking for some quality schools to review. Not my area of knowledge, hoping someone here might know of a couple good places. His background is in boxing, so beyond a Google search he doesn't have many resources that can help limit his search time, though he'll know a quality gym if he gets to one.

If anyone can help that would be appreciated.thanks in advance. Yes looking for a traditional Thai gym or an mms gym that has a stand alone must Thai program. I suggested he check out straight blast gym, but that's all that comes to mind.