You don't have to be a certain level, you just need to look for the quest Colossal Trouble from Ambrose after you've completed your quests in Firecat Alley.
I really need to know what LVL i need to reach Collossus Bvld.
I have a wizard, wizard, and wizard. I also have membership.
I have 3 QUEST-related things there.
I have like 10 pets.
Life Professor Greyrose said, you don't have to be a certain level.
To unlock Colossus Blvd, you must complete all of the Main Quests on Cyclops Lane, Triton Avenue, and Firecat Alley.
When you are finished these three Main Streets, Merle Ambrose will give you the quest "Colossal Trouble" which unlocks Colossus Blvd for you. Here is a link to one of the fansites with details on that quest:
wizard, 
wizard, and 
wizard. I also have membership.
