Scott decided to move on so that he could star in Parks And Recreation but told Hitfix that it was an "agonising decision".
"This opportunity on Parks And Rec came up, and it's one of my favourite shows," he explained. "And it was, of course, something I wanted to do, but there was still this lingering question of whether Party Down was going to continue."
He continued: "I couldn't pass up the opportunity on Parks And Rec for a show that could possibly not exist anymore... Though it was still agonising. It was saying goodbye to this show that's really just in my heart. It's tough."
However, Scott negotiated a deal which would allow him to return for three episodes of Party Down if it is renewed for a third season.
"I'd be anxious to go back," he said. "And I think that the show is structured in such a way that makes something like that really plausible, characters coming and going."
> Scott hopeful for 'Party Down' renewal