The Air India board gave a formal approval to the proposal on Thursday.
The Air India building was constructed in the mid-1970s and has been Air India's HQ since then.
Indian Airlines's head quarters prior to its merger was Delhi and the merger required frequent travel of top company executives between the two cities.
Now the company has decided to retain top three floors in the building including the office of its chairman.
The airline may also retain its first floor sales and reservation office.
Air India has offices on twelve floors of the Nariman Point building. But on several floors it has vast vacant space which was leased to tenants earlier and is now free of litigation.
The building houses chairman offices of the chairman and others including those of commercial headquarters, network planning,
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