The duplex was vacant when we bought it so I’ll be advertising for a tenant soon. 

Right on @Don Konipol: And another big one is that advertising a property for sale that you don't own, is called "being a real estate agent".

For example, we recently had 3 vacancies that we had to fill at once and some inquires slipped through the cracks since we advertise on multiple platforms.

captial partner is probably what your looking for.I would advertise on Pace Morby's facebook lots of beginner investors on that site that might do deals like this .. most experienced investors wont do gap funding based on risk. 350k unsecured line from a bank is really good those are hard to get.

It is just false advertising in fact. 

I've noticed a lot of coffeehouses decorate their spaces by advertising local art that customers can purchase.

Basically, you have to know that they're advertising the property based on a best case scenario. 

If you price your rentals at a reasonable price and stay steady with advertising and showings it should go.

You can search for members and see the agents (alongside everyone else) in Seattle but the only way to show up on a list of agents is to pay Bigger Pockets for advertising (currently $2,000 / 25 leads here in Seattle). 

If they don't use them, then you can advertise and rent out to anyoneGood Luck!