Mathrani indicated that a comment he made concerning Amazon was not intended to represent the company's plans.
During the General Growth earnings conference call, Mathrani alluded to Amazon's possible plans to expand Amazon Books, its brick-and-mortar bookstore. He made the remark in response to a question about mall traffic, according to a Wall Street Journal report.
"You've got Amazon opening brick-and-mortar bookstores and their goal is to open, as I understand, 300 to 400," Mathrani said.
The Journal reported that it was not clear where Mathrani got the potential number of stores. The publication added that the CEO may have discussed plans with real estate executives.
Amazon on Tuesday declined to comment to CNBC on the story.
— CNBC's Christine Wang and Reuters contributed to this report.