Credit Card cash Advance used to buy rental...Can I deduct intrest?

Hello,
I wrote a credit line check from my unsecured credit card in order to use the money to purchase a rental home for “cash”. I am paying the credit card payment out of the rents received. Can I write off the credit card interest since it is a business expense (used to purchase the home) even though the loan was not “secured” by the real estate?

yes.