** Self-storage REIT Extra Space Storage's shares EXR.N
fall 5% to $130.85 during aftermarket trade
** Co files automatic mixed shelf offering with the U.S.
securities regulator; size not disclosed
** EXR may offer from time to time debt securities in one or
more series - SEC filing
** In addition, selling security holders may offer and sell
shares of co's common stock from time to time
** Co's PT also lowered by Jefferies to $151 from $158 amid
lower asking rents
** YTD, stock had fallen 14%
(Reporting by Aatreyee Dasgupta)
((Aatreyee.Dasgupta@thomsonreuters.com))