Section 2(40)(d) in Tamil Nadu Town and Country Planning Act, 1971
(d)the re-conversion into a dwelling-house or a place of public worship or a factory of any building-(i)the use whereof as a dwelling-house or a place of public worship or a factory has been discontinued; or(ii)which has been appropriated for any purpose other than for use as a dwelling-house or a place of public worship or a factory;