** Shares of data center REIT Iron Mountain IRM.N fall 4.7% to $85.13
** Hedge fund short-selling partnership of Gotham City Research and General Industrial Partners (GIP) says it has taken a short position in IRM
** IRM did not immediately respond to Reuters request for comments
** The hedge fund short-selling partnership says Iron Mountain's heavy spending on data centers exceeds what its long-term budget can support
** Reuters could not independently verify the claims made
** Up to last close, stock had fallen ~15% this year
(Reporting by Arnav Mishra in Bengaluru)
((Arnav.Mishra@thomsonreuters.com;))