Board Thread:Game Discussion/@comment-76.97.138.136-20130719233243/@comment-4199297-20130720001839

Relevant topic about the quests from the game's forum: http://www.funzio.com/forum/showthread.php?61268-The-Building-Quest-Chain

tl;dr you could halt that 1 chain of "building" quests (with the "castle" icon), but there's still some building to do as part of another very, very long chain (has probably 10+ gems and a big chunk of money and XP in it).