Thanks for asking your question! I'm sorry to hear about your tax issue and I'm going to try my best to help you understand or resolve it.
Unfortunately you cannot take a loss on a personal use asset, and your former home is a personal use asset.
Having a home office did not make it a business asset
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Before my future home sale, how long shall I rent the house in order to claim it as an investment property? For example, after I lived in the house for 2 years. Thank you.