House Hacking: Adding Square Footage to a Second Floor

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Courtesy Reddit.
We read a few DIY sites and found a neat project worth sharing. This family is in a condo, and needs a little more space, but do not want to move. They extend the second floor in a vaulted area, creating much wanted square footage for an office. A work in progress, you can check out their methods and finishes.
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Courtesy Reddit.