Tenants at apartment complexes operated by Greystar, the largest owner and manager of apartments in the US, don’t just pay rent. They pay a mass of fees that many renters have never heard of before.

These add-ons include “boiler management fees”, “variable refrigerant flow fees”, “solar rebill” fees, even “lifestyle fees”.

Tenants and lawsuits in multiple states call many of these fees inflated, illegal, predatory or overwhelming.

“A fee for this, a fee for that was just crazy to me,” Nichole Collins, a former tenant at a Greystar-managed building in Colorado, said. “I had never experienced that before.”

Long lists of fees are common at buildings operated by Greystar, a private-equity backed conglomerate that owns or manages more than 1 million apartments across the US. According to tenants, housing attorneys, public officials and court claims, this tangle of extra charges fattens the company’s bottom line, increases renters’ risks of eviction and undermines fair competition in the apartment market by muddying the real price they pay for shelter.

Even more fun is that income qualifies you for base rent in places I’ve lived, but the fees aren’t considered, so making three times nominal rent can still land you in a spot where you’re paying 40% of income overall (or worse).