Possible Clues:

• Unwanted possession
• Burdensome possession
• Something too expensive to maintain (2 words)
• Expensive burden
• Costly possession that's no longer useful
• Useless possession
• Burdensome possession (2 words)
• Troublesome, expensive encumbrance
• It's often found in the attic
• A burdensome pachyderm? (2 words)