Any judgment and decree for the sale of real property to the Borough, on foreclosure for delinquent taxes, is conclusive evidence of its regularity and validity in all collateral proceedings, except where the taxes have been paid or the property was not liable to assessment and taxation. The judgment and decree is prima facie evidence that the taxes have not been paid and the property was subject to taxation at the time it was assessed. The judgment and decree shall stop all persons raising objections thereto, or to the title based thereon, which existed at or before the date of the judgment and decree and could have been presented as an objection or defense to the application for the judgment and decree. (2004 Code § 3.32.120.)