Somewhere between 1000-1500 SF, and the locale is excellent in a market with many people moving in and new developments coming in.I should have said "unit" and not "building"

That said, long-term the appreciation you get in the Puget Sound region is superior to many other markets, so assuming you find an excellent property management company that is able to screen tenants and only put in very well qualified, vetted occupants and you experience limited issues over the holding period, you'd likely come out ahead retaining the Mill Creek property if your financially able to do so and still buy wherever you are headed out of state.

-Where can I find a software to purchase or should I create my own excel to properly make sure that each deal would cash flow before I purchase?

The other guys had excellent responses and they know what they're talking about. 

The all in one is an excellent option

You seem like an Ideal candidate to pick a househacking market anywhere in the U.S.

I am seeing rates in the high 6s at 70 LTV with an excellent FICO 

We acquired the deal mostly for the lot, it’s a B class neighborhood in a growing city, on an excellent street. 

Mike,If you want to move from actively investing in real estate and defer the tax consequences, looking at DSTs is an excellent option.

The day this thread was started, "Thanks for Visiting" released an excellent podcast, #389, with tips to reduce risk.