There were no reports of any injuries in the blaze at the 14 storeyed Ansal API corporate park, which was in the final stages of construction, a fire department official said.
The fire started around 4 PM on the 12th floor of the building due to a spark in an AC and spread till the 6th floor, Fire Station Officer Sanjiv Kumar Yadav said.
It took two hours to extinguish the fire, he added.