The date you started advertising the property and it was available for rent is the date it was placed in service, February 15, 2025 based on your information shared.
You will not enter it as a rental property on your 2024 tax return. You are allowed to claim mortgage interest on Schedule A for your primary residence and one additional property. If this property would qualify under those circumstances, then you could claim the mortgage interest paid in 2024 on your 2024 return.
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