There are a lot of potential hangups with ADU's and DADU's, so definitely make sure your agent is an expert in this area or find one who is!

In Seattle this means a 650 sq ft DADU, but no additional ADU's (unless the zoning permits more units, but either way that would be adding additional units, not a ADU, to a multifamily.)95% of garage conversions are done without permits and are not legal, especially if the property is multifamily.

I helped my mom retire by building a two story DADU on her property that she Airbnb’s.

Very confusing.Puyallup rules here - http://puyalluplibrary.org/DocumentCenter/View/9771/Detached-ADUTacoma rules here - https://cms.cityoftacoma.org/planning/DADU/ADU%20Regulations%2001-23-19.pdf

The multi family house hack is definitely the way to go.We added an ADU and and a two unit DADU at my childhood home in Ballard about 5 years ago.

We have a family now, so moved out of the tiny house but have been Househacking SFH's w/ ADU's and DADU's since then, currently on Househack #4. 

Other ways to add value: Airbnb / STR part of the property, add a bedroom or more (but don't rehab the whole structure, add a basement ADU or backyard cottage (DADU), do a lot split, do an addition (we have an abbreviated permit process in Seattle for many additions under 700-ish sq ft)Off market deals are definitely worth exploring, but its also worth calling out that there are plenty of pros out there that spend 100% of their time hounding for these deals.

To get this COC you got to either house hack (ADU, finish basement, rent by the room, DADU, ....) or force appreciate the property by doing rehab.Turn key properties on the market typically will not get you high COC numbers.

Most seem to want a showing (i am currently making a quick google sheet with available time slots on a Sat morning for my dad to show).

This city is tough to leave behind.I'm a big fan of house-hacking at least your first 3 rental properties, ideally utilizing friendly ADU/DADU legislation if you're in Seattle or Tacoma proper.