You cannot claim the full rental expense of common areas since you are also using the space for personal use. At best, you can include 50% of the area of the common areas to calculate the percentage to apply.
In your example you would use the 240 of the Renter's space plus 50% of the common spaces, 165 (570- 240 = 330 x 50% = 165). The total rental area based on your example numbers would be 405.
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