It is pretty simple. Is the dwelling designed to be a place where people live – residential. If designed for commercial purposes – commercial. I feel you are going to try to claim that the house was unoccupied and therefore not residential, it’s a thought but will not work. Get an attorney.
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The distinction between 1st degree burglary, residential, and the less serious 2nd degree burglary, turns upon whether the structure entered is inhabited or not . Second-degree burglary, also known as commercial burglary, is generally charged when one is accused of entering a business establishment to commit a crime inside the business; typically theft.
Further, CalCrim No. 1701 on burglary degrees, a residence is considered inhabited "if someone uses it as a dwelling, whether or not someone is inside at the time of the alleged entry."