SECTION 1. Sections one and two of Republic Act Numbered Eleven hundred and sixty-two, as amended, is further amended to read as follows:
"SECTION 1. The expropriation of landed estates or haciendas, or lands which formerly formed part thereof, or any piece of land in the City of Manila, Quezon City and suburbs, which have been and are actually being leased to tenants for at least ten years, is hereby authorized: Provided, That such lands shall have at least fifty houses of tenants erected thereon.
"SEC. 2. The Land Tenure Administration shall institute the necessary expropriation proceedings before the competent court."