@Paul Weller
King County, Renton specifically. I think right now I'm technically OK since it's owner occupied and such.
As far as picturing myself as either tenant, and how separate the units are. They are both in the same house, but the apartment has a completely different setup including kitchen, exterior entrance, parking, bathroom, bedroom, living room, dining room, laundry, etc. The unit is on the other end of the top floor of a huge house, with a locking door separating the unit from the rest of the house.
The only issue I could think of is possible noise both ways. The apartments bedroom is partially over the master bedroom. I hear the tenant get up in the mornings because the floor creaks a little. Other than that, the unit is over the large 3 car garage.
Then there is the other way around. The house portion that I currently live in has 3 of it's 5 bedrooms upstairs. If the tenant for the house had kids, they may disturb the apartment tenant a bit since the apartment shares a bedroom wall with one of the upstairs rooms.
I guess it's one of those things I can try out and see. What I suppose I could do is market the property at $2,700 a month (a very good rate for the area and the house) and if they balk at the apartment setup I'll offer that area to them as well for a total of $3,500.
Apparently lot's of Asian families in the area with multi generational households, so perhaps I can find one family who is looking for such a setup. Thing is of course, this is a market where 90% of the people are home owners per the census, so most of your renter applicants have bad credit. They usually don't have a ton of options for renting so it may work.