The leasing deal in its Gurgaon Infospace Tikri SEZ with Aon Hewitt is worth Rs 800 crore, sources said.
The lease tenure is for 15 years and this is the largest deal in North India in over an year, they added.
A Unitech spokesperson declined to comment.
Total rentable area on completion of this SEZ project is 3.32 million sq ft. About seven lakh sq ft area is already operational with bluechip MNC tenants like Genpact, Colt, Cognizant and NTT.
The 25 acre Infospace Tikri SEZ is located next to a 150- acre ultra modern residential township being developed by Unitech (Uniworld resorts).