What is needed to change a duplex to a triplex?I'm looking at a duplex right now. Rental on 1st and 2nd floor. There is a high ceiling unfinished basement that has a outside entrance and is plumbed. I would like to purchase this and live in the basement and remodel it. When I'm finished I might like to move out and buy a single family house. The property is in Seattle and zoned LR2. I don't know much about duplexes and I wanted to know what it takes to get the property re-designated to triplex once I'm finished and want to move out so I can legally rent the basement as well. I did some online research on the matter but I'm coming up short. Any help appreciated, thanks!July 13 2013 - Seattle0YesReport a ProblemProblemSelect oneOffensive contentIrrelevant contentSpam (pure self-promotion)OtherDetailsYour emailPlease enter a valid email address.Submit CancelContent flaggedWe will review this content. Thanks for helping make the site more useful to everyone. To learn more, read Zillow's Good Neighbor Policy.We're sorry. This service is temporarily unavailable. Please come back later and try again.