22-year-old Paramjeet died in the attack while two of his colleagues, Sandeep and Rakesh, sustained injuries in the firing.
Police said more than five men barged into the office of a property dealer in Mehrauli area in South Delhi in the evening and opened fire on the people present there.
It said after the attackers fled from the spot, police were informed and the injured persons were rushed to a nearby hospital.
"Paramjeet was declared brought dead while the other two are undergoing the treatment," said a police officer, adding, the incident appeared to be the outcome of a personal enmity.