Tax Implications on Sale of Flat after PAA Agreement

My Great Grandfather property in Matunga, Mumbai was send to redevelopment in 2007 and my father got one flat of 1BHK including Extra FSI as a land lord in 2023. Now, We want to sell that flat immediately, What will be Tax Implications? Can we get Deduction in Sec 54, 54EC and Sec 54F? Will there be Index Cost of Acquisition? If yes how can we compute same?

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