Origins and architecture of the Taj Mahal older, pre-Mughal methods of proportion were employed as ordering principles in the Taj. The focus and climax of the Taj Mahal complex is the symmetrical white marble tomb; a cubic building with chamfered corners, with arched recesses known as pishtaqs. It is topped by a large dome and several pillared, roofed chhatris. In plan, it has a near perfect symmetry about 4 axes. It comprises 4 floors; the lower basement storey containing the tombs of Jahan and Mumtaz, the entrance storey containing identical cenotaphs of the tombs below in a much more elaborate chamber, an ambulatory storey and a roof
Taj Mahal dates due to differing opinions on "completion". Construction of the mausoleum itself was essentially completed by 1643 while work continued on the outlying buildings continued for years. Estimates of the cost of construction vary due to difficulties in estimating costs across time. The total cost at the time has been estimated to be about 32 million Indian rupees, which is around 52.8 billion Indian rupees ($827 million US) based on 2015 values. Abdul Hamid Lahauri in his book "Badshahnama" refers to Taj Mahal as "rauza-i munawwara", meaning the illumined or illustrious tomb. Soon after the Taj Mahal's completion, Shah Jahan