Thanks Pam! I'm glad it actually qualifies as modern. My modern houses usually turn out looking more and more traditional the longer they take to create.
Ausette, what I did was build the exterior walls of the house minus the foyer. Then, off to the side, I lowered the ground 2 "stairs", flattened a section down and build a wall in the hole. This makes the top of this wall 2 "stairs" above ground, or 1/2 the height of a normal wall. Then I used the constrain cheat to lower the external house walls down to the height of the wall in the hole (the lowered exterior walls now form the "foundation" of the house.) Next, I built the 2 exterior foyer walls which maintain their original height allowing for placement of doors and windows. At this point the foyer walls are higher than the house/foundation walls.
Then, I built the first floor by adding walls on top of all exterior walls ("foundation"), all the way around. It takes some fiddling and patience to get walls on top of the slanted sections but it's doable. Then, I lowered the second story foyer walls down to the same level as the rest of the second story (which is technically the first floor of the house.) Then the constrain cheat got turned off. Now, with the placefriezes cheat on, I added a frieze to the top of the foyer walls. Tada!