Some practical advice:
When you clear out a basement for a new tenant, it's important to clear out everything at the same time. Remember that your goal is to clear it for the next tenant or for your own use, your goal isn't to save old items. A good rule of thumb is to see if an item can sell quickly and easily for $300 or more. If it can't, you'll likely lose more by busying yourself with it. As much as it pains you to throw it out now, you'll find that you gained and saved more in your overall life and well-being in the long run.