[1] However, due to space constraints, Wallajah was forced to abandon his plans and instead constructed a palace at Chepauk, a few miles to the south of the fort.

[1] Known for its intricate carvings, wide arches, red brick walls and lime mortar, Chepauk Palace was built by the engineer Paul Benfield, who completed it in 1768.

"[2] When the principality of Carnatic was abolished in 1855 as per the Doctrine of Lapse, the Chepauk Palace was brought to auction to pay off the Nawab's debts and was eventually purchased by the Madras government.

[3] The palace functioned as the office of the revenue board and the Public Works Department (PWD) Secretariat.

[4] Humayun Mahal, the northern block, was virtually rebuilt between 1868 and 1871 by Robert Chisholm when assigned the work of creating a new records office and building for the Revenue Board by Governor Lord Napier.

To transform Humayun Mahal, Chisholm removed the tower, added a first floor and Madras terraced roof.

To compensate for removing the dome he also added a new eastern entrance, also in the style of the Khalsa Mahal, that faces the beach.

[10] In 2010, a roof collapsed in the Humayun Mahal and as of 2013 the Public Works Department, which was charged with the palace's maintenance, had not cleared the debris.