|This article belongs to the Classic Continuity|
The Evil Buildings are live buildings that appear in The Perfect Girlfriend.
They are animated building creatures created by Elena Validus via the Nanochips when she found out that Kevin was spying on her and Ben. They attacked Kevin and almost killed him. However, Ben came to his aid and defeated the buildings as Way Big by hurling them into the ocean.
Ben 10: Ultimate Alien
- The Perfect Girlfriend (first appearance; destroyed)