Lutyens was assigned responsibility for town planning and the construction of Viceroy's House (now Rashtrapati Bhavan); Herbert Baker, who had practised in South Africa for two decades, 1892–1912, joined in as the second in command.

[5] Today, the area is served by the Central Secretariat station of the Delhi Metro.

[6] The Secretariat Building was designed by the prominent British architect Herbert Baker in Indo-Saracenic Revival architecture.

Both the identical buildings have four levels, each with about 1,000 rooms, in the inner courtyards to make space for future expansions.

In front of the main gates on buildings are the four "dominion columns", given by Canada, Australia, New Zealand and South Africa.

But the similarities between the two building show a clear influence of the former, especially in the basic structure of two wings and colonnaded balconies at the end with almost identical symmetrical bell towers.

The colour scheme is reversed while the roof of Union Building is covered with red tiles, in secretariat red sandstone is used in the ground floor walls only, the rest is the same pale sandstone.