Activist investor Land & Buildings has a 2% stake in Six Flags FUN and plans to pressure the theme-park operator to spin out or sell its real estate, the Wall Street Journal reported on Thursday.

Land & Buildings believes Six Flags should evaluate an outright sale of its real estate, which it thinks could be worth as much as $6 billion, the report said, citing people familiar with the matter.

Land & Buildings and Six Flags Entertainment did not immediately respond to requests for comment. Reuters could not immediately verify the report.

Six Flags has a market capitalization of about $2.1 billion, according to data compiled by LSEG.

The amusement-resort operator missed its second-quarter revenue expectations and announced in August that its top boss Richard Zimmerman would leave the company by the end of the year.