That is the Madras Custom House in 1825, my office is situated behind the present day Custom House :-).
While googling for information about Madras I landed at this British Library site. It had some good photographs and illustrations of Old Madras. Frederick Fiebig's name was seen in many of the photographs, and on googling his name I landed at an even bigger treasure house. Type Madras in the search box and you will be transported to a different world. I am yet to go through all of them. You will find a picture of Ice house taken in 1840s, Bentinck's Building (the present day IG office), Parthasarathy temple and many more.