Seattle DADU questions

[Jason Foster]

Howdy!  I'm a homeowner in Seattle, and I'm thinking about building a DADU in my backyard, primarily for business use.  I'm a therapist in private practice, and generally see just one client at a time.  I have a few questions I'm hoping someone could help me with.

1 - What if I build the DADU, and then I want to move out of my house and rent out the house and the DADU? I understand that currently the law requires me to live in my house for 6 months out of the year.  Assuming the law doesn't change, is there an "out", like a time limit on how long I have to occupy the house after I build the DADU?

2 - How does a DADU effect sale price?  I don't imagine that everyone buying a house in Seattle (especially now that things are starting to slow down) will want to buy a place with a DADU that they can rent out.

3 - Is the existing driveway spotin front of the house acceptable for off-street parking?

4 - Can I run my business out of my DADU?   Can I also rent it out as an airbnb or (occasionally) as a longer-term rental?

Thanks!