Togusa is trying to make sure to get a name out of the man, first off. His line of questioning is interested in why the man is interested in this place, specifically, surely there has to be a place to build that is less trouble.

Light is focusing on more questions like "why here" since this is in the middle of nowhere and it's not like these people are really hurting anything, just living out their lives. Or where will all the people go if they're uprooted? What are they developing on this spot?

Togusa will be glad to answer his questions about Recolle, but not mentioning Retrospec. If the man knows about Retrospec, he'll wait for him to broach the subject first.

Edit: The two of them are going to be joined by Sakutarou Oda, a little late.