Property tax deduction

[Pratish SHah]

I bought my primary residence in June 2017. On July 1 2020, I will rent it out for the first time. In our county , I pay 2019 property taxes in 2020. The next half year taxes that I have to pay will be in July 2020 at which time I will be paying taxes for second half of 2019. I do not understand if I can pay these taxes and take it as a business expense. The worry is that the taxes are for 2019 when this house was my primary residence. 

Please guide. 

Thank you all.