ADU Builder here, I know you were especially wanting to hear from us :)  I'm down in San Diego and hope to offer a perspective of value, as we don't serve your area and I've devoted my life to ADUs for the past four years. 

I currently own my home in San Diego, CA, and am looking for some advice on whether I should buy or rent out in Seattle.

Zetimates are insanely off.

I know a few investors buying in San Antonio (multi=unit) - their numbers work even with high Texas property taxes. - I can't speak for other Midwest states but in Indianapolis metro area, my property taxes are pretty high 2.77 and 2.78% and the taxes go up with no limit (17% with my last assessment).

the cap rate for single family in san jose is maybe 1-2% ; DSCR is 0.25 ; but with very creative strategy we can make it into 0.8-1.1 but the key is using more tenants per unit, also home that has basement and ADU like me, the unit can be rented and while my dscr is above 1.0 but banks can't use it so we kinda stuck to leverage but this creativity of multiple tenants per single family.i am now trying 40 year IO program from one of the lenders such as yours to quality, also i will try no-ratio DSCR at some point.Seriously, by combining hefty cash position + flip program + rent out to multiple tenants ; and sell it few years later, this is the less riskiest project we can do as landlord/flipper.

I'm in Helotes but invest in San Antonio.  

My first STR experience, some 5 years ago was in San Francisco.

Amateur Vision would be a more appropriate name for these bunch of clowns.

I work in real estate, and as a fitness trainer, and the influx of people moving here for better weather, and flooding gyms has been insane, and it has not slowed much.

It was actually under contract with a contingent offer for months, so I suspected something may be up because at the time the velocity of transactions was insanely high in my area and closing times were as low as a week.