Aliens In Our Midst

A giant alien appears behind the unsuspecting old buildings. It inches forward, and in ten years it will have stamped out the old.

Here we see the area colloquially known as the Zoo, where alien buildings are trapped and isolated so as to prevent further damage.

Finally; we see tourists smiling at the photos they have taken, not realising how close they are to the wild animals that the alien buildings are with their rapacious appetites.