If you enter in costs that are to be capitalized then they are assumed to be put into service. So you can enter in the architectural costs as part of the rental and begin depreciating those costs for the remainder of the time that the property is a rental. When you convert it to personal use what is left of the depreciable basis of the architectural costs will be added to the basis of the home when you sell it, as @PattiF says above.
@prairieguy
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