Workers returned Monday to the Manhattan office building where a gunman killed four people last week.

Uniformed officers and plain clothes security details are scattered in and around the building.

Shane Tamura, 27, opened fire at 345 Park Ave., killing four people before taking his own life.

Sources say Blackstone employees were given the option to return to the office today. Regular scheduling is expected to resume next week.

Sources say the company is also offering counseling services to those who may need.

News 12 reached out to Rudin Management, which also has office space in the building, but did not hear back yet.