They didn't require me to continue using them for any other services.They'll be 100% up to date on state and local landlord/tenant laws, have an attorney on retainer, and they can probably get the job done legally for cheaper than you hiring an attorney hourly.Here are couple good PM's in the Sammamish area that might be worth reaching out to:- PMI Arka- Brink Property Management

I'm looking for advice on whether if it's worth it to invest on a triplex with all 3 units delinquent for over a year and owe more that $30K to the current owner.

You're basically giving them all they need to deny a claim.Not worth it in the long run.

That's a typical scenario and could cost you $10,000 - $15,000 so that would be a good starting point for your reserve.But there's more!

I don't know if this is worth pursuing but I feel like they've really dropped the ball over and over.

Is there one area that is typically viewed as the best option for house hacking? 

Then decide what is worth doing and what isn't. 

Based on some rough calculations, once fully stabilized and running (including property management), I predict the tiny home community to cash flow around $20,000/month and be worth roughly $3.5 million!

Typically a 6-12 month permit process. 

I probably have less answers for you, and more questions...We don't really know your experience level, so my first question is, do you realize you typically have to have about 20-25% "skin" in the game for this purchase?