Section 116E(1) in The Delhi Municipal Corporation Act, 1957
(1)The annual value of any covered space of building in any ward shall be the amount arrived at by multiplying the total area of such covered space of building by the final base unit area value of such covered space and the relevant factors as referred to in clause (b) of sub-section (2) of section 116A.Explanation.-"covered space", in relation to a building, shall mean the total floor area in all the floor thereof, including the thickness of walls, and shall include the spaces of covered verandah and courtyard, gangway, garrage, common service area, staircase, and balcony including any area projected beyond the plot boundary and such other space as may be prescribed.