So only one spell in the game has the scrying tag and it isn't even scrying? 

Good catch

I was in a game where the pc was unfamiliar with a building and was told it had a basement. The dm ruled it as obvious and allowed the pc from outside the building to use this spell to see and listen into a room in the basement. I was thinking that was to unfamiliar and it needed to have a visual component to be at least unfamiliar. What do you think?

I'd say that if you know there's a basement that you could attempt to place it where you think the basement is since once you know there's a basement it's fairly obvious where that would be. That doesn't guarantee you'll see anything. In my most recent game a PC used it to try to see past a city wall about a mile in and I allowed that then, though maybe I shouldn't have.

That cast time with no ritual tag seems like a lot.

It's concentration, so no, but also it takes 10 minutes to cast and lasts 10 minutes so even if you could start casting it a second time the first one would have expired by the time the second one begins.

If I cast this spell as a genie warlock using the Potion of Clairvoyance, and hopped into my genie vessel, would I still be able to see through it?

Can anyone help with adding this spell to a character sheet on DnD Beyond?

Quote from Pyrhelio >>

If I cast this spell as a genie warlock using the Potion of Clairvoyance, and hopped into my genie vessel, would I still be able to see through it?

 Yeah, sure. You could also use Plane Shift or something. There are some effects that say you have to be on the same plane, like Find Familiar. This isn't one of them though.

I don't think it would be fully unreasonable for a DM to rule otherwise, though.

So, since you need an eye for seeing and horn for hearing, and the spell says that you can switch between seeing and hearing as an action, do you need both material components to be able to switch between seeing and hearing?

Quote from Greller >>

It's concentration, so no, but also it takes 10 minutes to cast and lasts 10 minutes so even if you could start casting it a second time the first one would have expired by the time the second one begins.

 Actually casting spells that take more than an action to cast also uses concentration

It’s doesn’t require concentration so I think you could, but your player would probably be overstimulated by the several things going through their head so maybe some kind of saving through something