Just because you don't need all that space anymore doesn't mean getting rid of it is always a good idea.
The Wall Street Journal says not always…
But downsizing isn’t always simple, painless—or even all that beneficial financially. With the real-estate market still fragile, many baby boomers are getting a lot less than they expected for the old homestead. All too often, they have little cash left over after buying a new place, and their monthly expenses don’t fall as much as they thought—or may even rise instead.
And there are other problems, not the least of which is the hassle of getting rid of old stuff, packing it up, and adjusting to a new place. Read more about figuring out whether to downsize at the link.