No solid ground under my feet

Today I had to sake a survey in this building.
"Would you like to come in?" A friendly invitation I had to decline. I'm afraid of heights. No solid ground under my feet make me feel very uneasy. The last time I let myself endure that sensation was on la Grand Arche de la defense in Paris.
No thank you, I'll stay outside.
But this building is here since 1997 so what can go wrong.
The tourists love it.