The discovery that the outer garden was originally 4’ below the levels of the garden that surrounds the tomb required 125,000 cubic feet of earth to be manually removed to restore historic levels. The enclosed tomb-garden stands at the entrance zone of the Humayun’s Tomb complex however inappropriate alterations and unplanned planting in the garden had disfigured the original intention which required to be restored together with the buildings that stand here.
The Isa Khan’s tomb garden was discovered to have an inner garden in the immediate setting of the tomb and a lower outer garden, both separated by a masonry retaining wall. Structural analysis revealed that large portions of this wall were built in mud mortar and rubble. Archival research revealed that the wall was completely rebuilt in the mid 20th century. 530 cum of random rubble stone masonry thus required to be reconstructed in lime mortar For visitor access, pathways have been built in the cardinal directions in Delhi Quartzite. The octagonal internal retaining wall allowed the outer garden to serve as a typical Persian sunken garden, irrigated with flooding. The outer garden has been planted with a citrus grove. This will eventually allow visitors standing on the upper levels to be at eye level with tree-tops.