During the Vengeful Five’s campaign against the Freedom Five, Baron Blade destroyed the original Freedom Five headquarters. The heroes narrowly escaped, but when it came time to construct a new HQ, the team decided to upgrade their base of operations significantly. After obtaining private funding from Montgomery Industries, the Freedom Tower was constructed in the heart of downtown Megalopolis, standing as a symbol of the protection the heroes offered the city, the world, and the entire Multiverse. It also acts as a villain lightning rod - any attacks that would have previously targeted the city were naturally drawn to the giant tower, as taking down the Freedom Five would be the crowning achievement of any ambitious villain.
The Freedom Tower makes an excellent home turf for many heroes, but if it were to be overrun by villains and their minions, the results would be devastating.