Police say that 39-year-old Leonardo Parera of Kearny entered Exit Reality where he worked as a realtor and shot and killed 47-year-old Christine King of Oak Ridge.
It happened just before 5 p.m. on Friday. Both Parera and King, who worked as a receptionist, were working in the office that day.
After the shooting, Parera exited the building, called 911 and reported that he had shot and killed someone.
He also indicated that he was heavily armed and would shoot anyone who approached him.
Parera entered his vehicle and remained in the lot.
When responding patrols arrived, he fired at police and engaged them in gun fire exchange.
Numerous rounds were discharged before Parera was shot and killed.
Residents in the area reported hearing bursts of gunfire along Route 46 West.
"You don't realize if it's real. It was scary," a resident said.
"I heard shots," another resident said.
Businesses along the busy stretch of road were packed with customers.
"Everybody was scared because we heard the gunshots go off," a resident said.
They say they heard 20 to 30 shots fired and buildings were evacuated and cleared.
In some cases, police brought people out in handcuffs just as a precaution.
"For the first couple of hours, our primary concern was removing people from the buildings safely," Bianchi said.
Police still haven't revealed a motive for the shooting.
The investigation is ongoing.