Long term capital gain tax on sale of a residential plot

Correct me if i am wrong

1) u can purchase only 1 flat

within a period of one year before or two years after the date on which the transfer took place purchased, or has within a period of three years after that date constructed, a residential house

2) Cal of LTCG

Sale Proceeds                                                                                            xxx

Less: index cost of acquisition

= Cost*(Cost inflation Index for 2012/cost inflation index for 1993)          (xxx)

Less: index cost of improvements

= Cost*(Cost inflation Index for 2012/cost inflation index for yr of imp)     (xxx)

Less: Exp incurred for sale of asset                                                           (xxx)

LTCG

3) Legitimate Exp incurred in connection with the sale of asset