I'm a newbie trying to rent out rooms in my 4-bedroom, 3-bathroom house in Seattle.

Talk to planning at the city about available funds they for housing projects like TIFs, CRAs, Housing vouchers, housing grants, etc. 5.

I am now considering renting by the room for my current house.

The house is not on a water.

I "flipped" the house I used to live in (and rent rooms out of), and currently run an Airbnb in my second house. 

I moved up here to get a bunch of land to house hack and the trailers are in livable condition. 

I have a vacant lot that I can build a 1200 SqFt house on.

My presentations were geared towards new construction, but there are ways to improve existing homes as well.The main keys are to understand how energy (heat/cold) moves through houses and how to eliminate the weak links in heat loss/gain. 

Order something from every bar, order something from every restaurant, make the waitresses work for you, tour the place- the restrooms- the kitchens- the back of the house and walk the entire outside of the building. 

The San Francisco Bay Area housing shortage has prompted a lot of homeowners and investors to add Accessory Dwelling Units (ADUs) to their properties.