An official at Lenox Hill Hospital in NYC tells TMZ ... there are 7 suites in the VIP section where Beyonce gave birth. Each executive suite costs between $700 and $800 a night.

We're told the suites have "reconfigurable designs." Translation -- the dividing walls are movable so the VIPs can expand into more than one suite.

In Beyonce's case, the official wouldn't be specific, but we're told she had at least 4 suites -- which could explain the 4 flat-screen TVs. So Beyonce probably paid $3,200 a night -- she can afford it.

We're told any patient can use the rooms, provided it satisfies the needs and treatment of the patient.