House building help

@deejcake, most likely that is not a true "foundation" but the first level of the house made to look like a foundation at that angle.  If you look at the bottom right of the lower level of the house (what appears to be under the part of the balcony (that has 2 couches and a coffee table)  that juts out at a point, you will see that what looks like the foundation of the house actually has windows! 😎  And this lower level looks to be on a regular foundation that is colored the same as the outside wall.

This looks to be a way to mimic a split-level house since in TS4 we can't build into a hillside. By the mailbox there are a few steps to get up to the foundation, and then what looks like a giant foundation with the pool windows with stairs leading to the entryway.  I have seen (and downloaded) a pool with windows like that, but it was made so that the windows weren't facing outside, but inside to a bedroom.  Pretty cool, but not as much as the house you showed us!  I have pictures, but I can't seem to find the ones of this pool. I'm not the best builder, but I can try to see if I can build a pool like this. 🤔😳

I agree it is a stunning build! ❤️  If you ever find out who made it, please tell us! 😇