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CHICAGO — A worker at One Prudential Plaza has tested positive for COVID-19.

Property owner Sterling Bay notified some employees of a COVID-19 case Tuesday night, according to The Chicago Tribune Guild.

The employee felt ill on March 5 and went home before being diagnosed with coronavirus.

The employee has not returned to the property since feeling ill on March 5, according to building management.

Anyone who feels ill should stay home and see a health professional if they experience COVID-19 symptoms, Bay said.

“We will continue to follow all cleaning and disinfection recommendations put forth by the Centers for Disease Control and Prevention (CDC) and World Health Organization (WHO) and have been aggressively cleaning all high touch areas throughout the buildings,” Bay said in a statement.

A spokesperson for CA Ventures released a statement that said:

On March 10, a Chicago-based CA Ventures employee reported testing positive for coronavirus disease (COVID-19). The employee has not been in the company’s Chicago headquarters since Tuesday, March 3, and has been under quarantine since the diagnosis. Individuals whose work areas are in close proximity to the affected individual have been notified and, although none have presented symptoms, they will remain under self-quarantine for the next 14 days.

Our immediate concern is with the affected individual and their family, and our number one priority is ensuring the safety of our staff and community. We are taking every precautionary measure possible to protect the health and well-being of our corporate employees, as well as our site-level associates and residents across CA’s portfolio. We continue to follow the latest guidance from the World Health Organization and Centers for Disease Control, as well as state, county and city health officials, as this situation evolves. We take this situation very seriously, and have taken some additional precautions in an effort to minimize risk in the workplace:

Our Chicago office was immediately closed and Chicago-based staff have been instructed to work remotely.

Our Chicago office is undergoing a professional cleaning and sanitation in accordance with CDC guidelines.

The suspension on all non-essential staff travel and meetings continues.

One Prudential Plaza was open for business Wednesday.