Same amount of squares as the starter home below.... just a few extra walls thrown in there.. For this one, there is no foundation, but if you want some, you can add it, and then add stairs, but that will raise the overall price and would not be considered a starter home anymore.
Here is a starter home that I built in my game and decorated and then uploaded to the Sims website. http://www.thesims3.com/assetDetail.html?assetId=2353410 :) For this one, there is no foundation.. but if you want foundation, you can add it and then add stairs, but it will raise the overall price and would no longer be considered a starter home.