SECTION 1. Section twenty-five hundred and seven of Act Numbered Twenty-seven hundred and eleven, known as the Administrative Code, as amended, is hereby further amended to read as follows:
"SEC. 2507. Power to levy special assessments for certain purposes.—The Municipal Board may, by ordinance duly approved, provide for the levying and collection, by special assessments of the real estate comprised within the district or section of the city especially benefited, of the cost, or a part thereof not less than sixty per centum, of laying out, opening, constructing, straightening, widening, extending, grading, paving, curbing, walling, deepening, or otherwise establishing, repairing, enlarging, or improving public avenues, roads, streets, alleys, sidewalks, parks, plazas, bridges, landing places, wharves, piers, docks, levees, reservoirs, waterworks, water mains, water courses, esteros, canals, drains, and sewers, including the cost of acquiring the necessary land. Within the meaning of this article, all real estate comprised within the district benefited, except lands or buildings owned by the United States of America, the Government of the Philippine Islands, or the City of Manila, shall be subject to the payment of the special assessment, based upon the valuation of such real estate as shown by the books of the city assessor, or its present value as fixed by said officer in the first instance if the property does not appear of record in his books according to the valuation whereof the special tax has to be made, computed, and assessed."