• Capital gains tax on flats sold after JDA with builder

Hi,We have a piece of land and we entered into a JDA on 2016 for the development of it with a reputed builder. The land was bought by my grand father in 1957.The same has been inherited by my father (current sole owner) and he entered into this JDA. As per JDA we will be getting 7 flats as part of JDA.Now my questions are
1. What is the Capital Gain Tax we have to pay once the possession is given to my father by the builder? Even if we not sell any flats still on getting possession do we need to pay Capital Gains Tax?

2. If my father sells some flats (only after getting possession) out of his share how will the Capital Gain tax calculated?Will it be Long Term or Short Term?Because the flats are new but the land's possession was on 1957.Which date should be considered for Capital gain the date on which the posseion is handed over or the date the land was bough by my grand father?

3.If my father Gifts me some flats and I sell it after one month(from the date of receiving possession) will it be long term or short term capital gains tax applicable?