Philadelphia police responded to the office building on the 300 block of Chestnut Street around 2:14 p.m. Wednesday.
When they arrived, they found the suspect, later identified as Jeffery Stepien, 48, holding two pipes. Officers took him into custody without incident.
The woman, Samantha Maag, 31, of Blenheim, New Jersey, was found lying on the floor. She later died at Jefferson University Hospital.
Sources told Action News the attack may have been fueled over a rent dispute.
31-year old Samantha Maag was brutally beaten to death inside 325 Chestnut St office building. Her attacker was caught a short time later. Her parents say the South Jersey native was smart & kind. She attended Triton HS & Rowan U. pic.twitter.com/7GeiU9Mzqd— Annie McCormick (@6abcAnnie) January 20, 2022
Police confirmed the suspect was renting one to two units on the eighth floor of the building where the victim also worked.
"We know that they know each other. We believe there may have been some arguments or problems in the past, however, we are still working on that information," said Philadelphia Police Chief Inspector Scott Small.
Police said about 20 calls to 911 reporting the attack were made.
Detectives also questioned some 10 witnesses.
Investigators said those witnesses did not appear to intervene, but the victim did try and protect herself.
"She had defensive wounds on both of her hands," said Small.
As for the suspect, police said once they arrived on the scene he was seen getting out of the elevator covered in blood and was holding a bag carrying the two pipes likely used in the assault.
He was taken to the homicide unit for questioning.
"It was definitely a very violent, tragic incident," said Small.
Thursday people who work in the office building on separate floors said they were still in shock.
"A lawyer who works in my office said that there was blood in the lobby. We got an email from the building saying there had been an attack and we shouldn't exit thru the lobby anymore and we should exit thru the basement and they would have signs to guide us out," said Jeremy Meyer, who is a lawyer in the building.
Bruce Hazany who also does businesses in the building said the suspect looked familiar and said he walked by shortly after the attack.
"There was a bloody pillow here and I said what's happening," he said.
A spokesperson for MRP Realty who owns the building released a statement to Action News: "We are deeply shocked and saddened by this tragedy and our prayers are with Samantha Maag and her family. We and onsite security are cooperating with law enforcement in their investigation, as the safety of our community here in the building is our top priority."