Washington state property management question.

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This is more of a state specific question as I know many states have different laws. Does anyone in the state of Washington know if I can open a property management company in this state without a "managing brokers" license. I have multiple rentals, and now its getting to the point where I want to be more professional. before I had sfh so it was easier to be more personal, but now with 4 plexes and 8 plexes under my belt, I'm thinking I should have a online portal to pay rent and do the whole thing right. I would be managing only my own properties, not anybody else's. would I still need a "managing brokers" license. I knnow @Brandon Turner does a DBA thing where he makes a business entity and uses that as a dba for the tenants to pay rent to. But im not clear on all of that and I could not find the article he wrote on that. hopefully someone can clear all this up for me. thanks.