Basement causes severe terrain errors
Product: The Sims 4 Platform:PC Which language are you playing the game in? English How often does the bug occur? Every time (100%) What is your current game version number? 1.89.214.1030 What e...
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This looks like one of the quirks of the build system and has been around for a long time. If you put a basement under a house on a raised foundation or raise a house on a flat foundation with a basement under it, the terrain raises like that. To fix it, just drop down to the basement level and grab the big arrow in the center and drag the basement down until the terrain is flat again.
In your pics though, you show raised terrain around only part of either building. I'm guessing that the basement is a partial basement, not a full basement under the entire building. It that is not the case, then something else is going on.
Hope this helps.
@CGrant56 What you mentioned helped fix this issue in one of my current households. I had originally tried just lowering the ground level floor but it wouldn't let me, though I didn't even think to lower the basement level. I did end up lowering both the basement and ground level floor though. If I only lowered the basement it left an awkward looking gap between the top of the stairs and the top of the basement wall, and I couldn't find any way to fix it other than lowering the ground level floor as well. So I did have to sacrifice my foundation, though at least I don't have that ugly looking uneven terrain and it does eliminate having to deal with stairs just to get in and out of the house.
