Buildings should not care what the terrain model says.
If the requirements say the land is flat enough to build on, then whatever the building is that is placed on that site needs to stand vertical, not at some wild angle like the spines on a succulent.
In reality the variable would ordinarily be the finished height, not the combined, aggregate angle of the terrain it sits on, because the first thing you do in construction is get true, flat grade to build on.
Site prep is part and parcel to all construction, and should not be overlooked.
Making all structures built subject to these simply incorrect building practices produces visually appalling pictures of cartoonish character, with buildings askew and anon as if built by a clan of idiots.
