Building a basement without basement tool on preexisting home
I am trying to build a basement for my sim Lisa Smith. She lives in sunset valley at 58 Water Lane. So far I have added a burglar alarm next to the front door of the house. I don't want to destroy her home just to rebuild it with a basement. I don't have World Adventures or Patch 6(the one that gives you the basement tool) installed so I am wondering how I can build a basement for this preexisting home without destroying it and without using the basement tool. I can build a second floor just fine but I am stuck on how to build a basement. How can I build a basement without the basement tool?
If it means building a new lot, I could do that but I would rather do it on her already existing home so that she doesn't have to move in order to have a basement.