That's a good question. Brick, mortar, stone, wooden beams, and metal ones too. [No Caspian that's how buildings are made, not how they're made TALL.] I am sure they have high ladders. [And gryphons to help out, no wait that's for home.]

As for the lights, it is this strange but wonderful energy called electricity. I think you may be a little familiar with it.

[For once he's glad to be able to introduce another 'backwards' person to modernity. But where clothes are concerned...]

For many, tailoring has become a lost art. They have my pity.