Advance tax applicable to ltcg ?

Dear Sirs/Madam, I recently sold my 17% right in a commercial property(ancestral) after more than 30 years. The capital gain is based from 1981 is large. Should i pay Capital gain Tax as Advance tax before 15-9-15,15-12-15 and 15-3-16 or i can pay before the end of FY 2016. I am inclined to opt for 10% without indexation aas it is cheaper than 20 % with indexation. As the price in 1981 was negligible. Regards ASHOK