Denver police identified the man arrested after a major manhunt at a downtown building Monday as Joseph Smith.

Smith, 21, faces multiple charges, said Raquel Lopez, Denver police spokeswoman.

Denver police surrounded the building at 110 16th St. Monday morning to search for a wanted man.

Just after 11 a.m. Smith was arrested. But, he was not the man police originally were looking for, according to Lopez.

Police were initially searching for Robert Jackson, 28. There are felony warrants from Centennial for his arrest on robbery and escape charges, records show.

After police took Smith into custody, police spokesman Sonny Jackson said that man they were looking for was not Robert Jackson.

Police said Aurora police contacted Denver to say that Robert Jackson would be on an RTD bus downtown. Aurora warned Denver that their suspect could be armed and dangerous.

Early Monday Denver police officers came into contact with a man they thought to be Robert Jackson downtown, and he ran from them.

“Maybe he has other warrants and that’s why he ran,” Lopez said.

The man shed clothing as he ran. Denver officers believed he ran into the Petroleum Building.

Paige Kanatous works on the fifth floor for an event management company. She said her ceiling began leaking water and she wanted to find someone in building maintenance. She tried to take the elevator but it wasn’t working, so she took the stairs.

In the stairwell, Kanatous encountered two officers, who told her to “freeze!”

She put up her hands and said, “I work here!”

Sonny Jackson said Smith had been hiding in the building and had tried to slip out with workers who were being evacuated.

Police spotted him and detained him. He was not armed when he was taken into custody.

Police are still looking for Jackson.

Businesses and workers in the area were soon back to normal, although some restaurants couldn’t prep for the lunch rush or get deliveries and so opted to close for the day.