Chennai can have max 60 m height buildings (20 floors) and certain
areas like Ambattur where upto 70 m height (23 floors) is permitted
(out of Met Radar funnel area) if Helipad is provided at the top.
Generally Chennai builders apply for either 15 metres (stilt + 4) (to
launch a project) and then enhance to 60 / 70 metres later after
obtaining NOCs from 18 depts (as this takes a lot of time).