Mark Collins, 63, from Kramfors in the Västernorrland region, sent an email requesting to leave the party on Tuesday morning, after his proposal was rejected as "a serious infraction", and "an incredibly problematic incident" by the party's leadership.
He will now sit on the local council either as an independent or join another party.
"They said they're going to discipline me with a rule that SD has against any building or architecture that does not resemble Western culture," he said of the party's internal reaction.
"It seems like a page torn out of the Nuremberg racial laws," he told The Local, referring to the anti-Semitic laws introduced by Germany's Nazi Party in 1935. "It's absolutely absurd, it's off-the-wall, crazy shit."
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