There are a couple ways you could decide to split the cost. Assuming the lawyer does not have a time charge for each property, my advice would be using the fair market value (FMV) of the combined total of both homes, then use the rental home value divided by the total value to arrive at the rental portion percentage. Likewise you could use the cost of each property if you feel that is more reasonable.
You should make the determination in a way that you believe is the most reasonable, then keep that with your tax records.
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