Does anyone have any tips on how I should approach the potential seller or what tips that I should be looking for to identify the sellers motivation? 

My approach is nearly always that the best path would be to sell your SFRs and 1031 into a larger MFR where you have lower per-unit purchase costs, efficiencies of scale, and the ability to force appreciation.I know Seattle is expensive, but I'm sure with some work you can find a property that will fit the bill.As far as where you're living now, stay there.

With a MFR, you have less vacancy risk, efficiencies of scale, and (if 5+) the ability to force appreciation.

SFH demand the highest per-unit price and large MFR see the efficiencies of scale necessary.

While technically, I guess anyone could, however, someone lacking the very specific and very specialized skill set required to "procure" this efficiently, would not be able to collect the information prior to the tax list being published.

YOU are YOUR own MOTIVATOR!

You came to the right place to learn more about real estate and connect with other motivated investors.

I am a highly motivated person just looking to find a way to get my feet wet in a new industry.

@Bryant Brislin - sounds to me like you are speaking with sellers who don't have the motivation to sell quickly.My suggestion is:1.

What is your motivation to use hard money?