From the release:
Federation City is the initial release of Burn In Designs new line of 6mm terrain. The sets goal is to bring a more realistic skyline to games like Battletech or Robotech RPG Tactics. Now with skyscrapers and multi-block structures that even the largest mech can find cover behind or in. Scale up your game and understand that a 4 story tall mech is no match for a 15 story building.