The killers had also carried a garland and 'agarbattis' to perform a mock funeral of the builder.
Office employees, who saw the murder on the company's CCTV monitor, gave the duo a chase and managed to nab one of them.
"I hit one of the fleeing gunmen with a stone. He tried to take out his gun, but fortunately other office workers pinned him down, and later handed him over to the police,'' said Ganpat Chavada, an office boy.
The arrested hitman Venkatesh Shettiyar claims to be a property dealer. He told police he killed Lahoria because the latter did not pay him his commission of over Rs 20 lakhs.
Lahoria's son Sunny Kumar said, Venkatesh has given the names of two prominent persons, whom the police has not arrested so far.
