Garg ji,
The tree is in Theosophical society campus, Adyar Chennai.
I am sure the Id suggested by me is correct. As this tree has been planted / introduced ( an isolated case) the POWO cannot recognise its distribution . This international campus has many exotic trees / plants planted by foreign visitors from various countries. This tree, also, has been planted by a foreign visitor decades back.
Furthermore, the tree has been recorded by one of the distinguished taxonomists of Chennai as S.apetala, located in Theosophical society.
For your kind information.