Immediately upon passage of this chapter, or, in the case of Los Alamos, upon its inclusion within this chapter, the Commission shall classify all real property (including such improvements and such fixtures, equipment and other personal property incident thereto as it may deem appropriate) within each community in accordance with such classifications as shall insure reasonably similar treatment for reasonably similar property. The classification shall be made by such procedures, consistent with this subchapter, as it shall determine.