Section 19(3)(a) in The Gujarat Slum Areas (Improvement, Clearance and Redevelopment) Act, 1973
(a)if the work of improvement has been executed in relation to be building, annual rent of a sum equivalent to the aggregate of the following amounts namely:-(i)the annual rent the tenant was paying immediately before he vacated the building for the purpose of execution of the work of improvement;(ii)six per cent, of the cost of the work of improvement;