Long term capital gain

As per sec 54F(LTCG arising from the Transfer of any capital asset other then residential house) of invested in residential house; If the cost of the new asset is greater than or equal to net consideration then entire capital gain will be exempted from tax provided the time limit for investment if PURCHASED 1yr before or 2 yes after the date of transfer

And in general the individual must have only one residential house property in its name

Thanks for reply I want to retain residential house which I already have in addition to above I want to purchase second house after selling commercial property. Will I not get tax exception ? Asper news in economic times dt 12/1/2013 (available on net ) two year period will be extended to three years if building is under construction. Also one can retain old house along with new purchased after selling commercial plot. Please clarify. Regards