Technically the car ones would not be really as big as a building, also there would be a great difference in size between different robots as an F-15 is much larger than a Lamborghini. So obviously Transformers that turn into cars can't be as big as Seekers. I don't know if it's a fact that Transformers other than Cassetticons change size as they transform.
__________________ "Crush your enemies. See them driven before you. Hear the lamentations of the women." - the prophet Mohammed, single-handed inventor of terrorism, pedophilia and moon-god worship
Which Bay then denied of all the cool characters, in favour of equal mass......only to fu*k the whole thing up by then having a mass shifting cube..... the imbeciles.