It shall be conclusively presumed that any transfer, grant, sale or mortgage of land and property abutting or contiguous to an abandoned road, street or alley, the dedication of which has been revoked, shall be held, deemed and construed to include all of grantor's or mortgagor's interest in and to said abandoned road, street, or alley, in the absence of any express provision therein particularly excluding the abandoned property therefrom; provided further, however, that no then existing valid servitude or rights of third parties in or on the abandoned property shall be in any manner or to any extent impaired, prejudiced, or otherwise affected by any of the terms and provisions of this Part.
La. R.S. § 9:2981