I couldn't find any business licenses for the co-working space it's housing now.

If you have access to those non public documents, you are ahead of everyone else.

Offer accepted on my first deal (triplex) and inspection pending (WA State).During my initial walk-through, I met a couple who seemed to be more than knowledgeable about the property, possessed keys to storage areas (possibly other units too), had special parking spaces, and stated that they take care of the things around the place including the large yard in exchange for lower rent.

Ask the city if there are any requirements like open space or pervious surfaces. 10.

Typically, masonry houses will have little to no insulation in the exterior walls due to lack of space.

It's not super in depth but should give you a good overview of the process and key terms.https://files.consumerfinance.gov/f/201503_cfpb_yo...If you are looking for more in-depth book, like Mortgages 101 or something similar, I would recommend looking at the publication date and focusing on the most recently published books. 

Since they've moved out we realized the space would be great as a room rental.

The questions you ask indicate very low level of working knowledge in this space.

One of my tenants is currently moving out because they need less space (going to one bedroom from two bedroom) I just had another tenant move in because they needed more space (going from 2 bedroom to 3 bedroom).

Hi @Jeff Oberts, here is a public one I created a while back if you want to check it out.