The full quote from The Hitchhiker's Guide to the Galaxy:
> “But the plans were on display…”
> “On display? I eventually had to go down to the cellar to find them.”
> “That’s the display department.”
> “With a flashlight.”
> “Ah, well, the lights had probably gone.”
> “So had the stairs.”
> “But look, you found the notice, didn’t you?”
> “Yes,” said Arthur, “yes I did. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.”
Your quote is about the local department's plans to demolish Arthur Dent's house.
The quote about the destruction of Earth is:
>‘There’s no point acting all surprised about it. All the planning charts and demolition orders have been on display in your local planning
department in Alpha Centauri for fifty of your Earth years, so you’ve had plenty of time to lodge any formal complaint and it’s far too late to start
making a fuss about it now.’
> ‘What do you mean you’ve never been to Alpha Centauri? For heaven’s sake mankind, it’s only four light years away you know. I’m sorry, but if
you can’t be bothered to take an interest in local affairs that’s your own lookout.
> ‘I don’t know’ said the voice on the PA, ‘apathetic bloody planet, I’ve no sympathy at all.’
> “But the plans were on display…”
> “On display? I eventually had to go down to the cellar to find them.”
> “That’s the display department.”
> “With a flashlight.”
> “Ah, well, the lights had probably gone.”
> “So had the stairs.”
> “But look, you found the notice, didn’t you?”
> “Yes,” said Arthur, “yes I did. It was on display in the bottom of a locked filing cabinet stuck in a disused lavatory with a sign on the door saying ‘Beware of the Leopard.”