U.S. property management company Greystar swindled renters across the country out of hundreds of millions using deceptive advertising and hidden fees, according to a lawsuit filed Thursday by the U.S.

The U.S. Federal Trade Commission and the State of Colorado have filed a complaint against Greystar, a multi-family rental property manager, alleging that it deceived consumers about rental costs with hidden fees,

Colorado and the FTC say Greystar Real Estate and Property fraudulently advertises low rent prices to potential customers, only to add tens if not hundreds to the monthly rent cost with hidden fees.

Greystar is set to face a federal lawsuit as soon as this week over allegations the nationwide developer and manager of apartment buildings stuck renters with millions of dollars in hidden fees, according to people familiar with the probe.

The suit accuses the company of falsely advertising rental prices by failing to inform renters of numerous mandatory fees.

The Federal Trade Commission plans to file a lawsuit against apartment management company Greystar, which manages thousands of apartments in metro Atlanta and Georgia.

The antitrust agency recently created a rule regarding junk fees, but its application to the multifamily sector is unclear.