In addition to the authorization for the collection of taxes and institution of tax sales authorized by the Real Estate Tax Sales Law (“RETSL”), 72 P.S. § 5860.201 et seq., the Montgomery County Tax Claim Bureau is appointed as alternative collector and is authorized and directed to file liens for existing delinquent real estate taxes with the Prothonotary of Montgomery County in accordance with the provisions of the Municipal Claims and Tax Liens Act, 53 P.S. § 7101 et seq.