If you want to be one of the first people to own the 10th anniversary modular set with the LEGO Creator Assembly Square (10255), LEGO ReBrick has announced a new building contest for a chance to win one. From now until November 29, 2016, expand your favorite modular building by building a new room for it. If you don’t own the modular building you want to build for, don’t fret because you don’t actually have to own the set. You just have to state in the description of which building you’re creating the interior for.

For being the grand prize winner, LEGO has provided some very nice sets as prizes. On top of the 10th anniversary Assembly Square (10255), you’ll also be getting the Pet Shop (10218), Parisian Restaurant (10243), Detective’s Office (10246), Palace Cinema (10232), and the Brick Bank (10251). That’s right! One winner will be getting a total of six sets for creating the best interior for a modular building. Check out the full rules in the link above.