Authorizing the revision of lines and grades on a portion of City Plan No. 246 by striking from the City Plan Fifty-First Street from Woodland Avenue to its terminus southeastwardly therefrom and reserving and placing on the City Plan a right-of-way for public utility purposes within a portion of said Fifty-First Street being stricken and authorizing acceptance of the grant to the City of the said right-of-way, under certain terms and conditions.