This is found on top of Jenny’s Diner in King’s Court. You will need the Rex Fury character (unlockable in the final story mission) to open the door.
Go to the airport and look for Hangar #1 at the east side of the map. Again, you’ll need Rex Fury to open the door.
After obtaining the Rex Fury character, return to the secret base from the special assignment “Disruptive Behavior”. After the freefall, open the large crate that only Rex Fury can open. To the left of it is a laser-protected room, which is where you’ll find the Red Brick.
Travel to the south tower of Albatross Island. The room at the bottom of the tower holds the Red Brick. Use the crowbar to open the door.
Go to the ground level of Ellie’s apartment building. Use the elevator to reach the apartment itself. You’ll find the Red Brick in the hall on the left.
Swim along the southwest end of Crescent Park. There you’ll find the Red Brick hiding along the rockwall.
Travel about halfway through the Crosstown Tunnel and look for a door along the walkway with an orange handle. Use Rex Fury’s strength to open it and grab the Red Brick.
In the dojo interior, use the astronaut disguise to teleport to the balcony. Drop down one level to find several occupation portraits. Go back up to the higher balcony, notice the boxes with images of occupation tools. Rotate the boxes to match the tools with the occupation portraits below.
Approach Fort Meadows from the south road. Stay right and travel along the unpaved road until you reach a cave blocked by boulders. Use dynamite to break the silver boulders. Venture into the spider cave to find the Red Brick.
Travel along the Grand Canal until you reach a widened portion of the walkway. There you’ll find a coffee break station. Walk left along the walkway to find the Red Brick.