The taco joint will begin its lunch service Wednesday in the Peachtree Station complex.
The Canteen, a 'micro food hall' concept, is from the team behind The General Muir, West Egg.
Mandolin is slated to open fall 2017.
The Venezuelan eatery's last day in Decatur is scheduled for June 30.
Plans this week were filed to renovate the Candler Park space where the restaurant will be situated.
June 5 was the first day in business for the Asian-fusion eatery.