June 19 (Reuters) - The following are the top stories from selected Canadian newspapers. Reuters has not verified these stories and does not vouch for their accuracy.

THE GLOBE AND MAIL

** Citibank's Canadian unit has purchased the Mississauga, building in Ontario housing its global operations hub and has bought an additional parcel of land, as the major U.S. bank expands in Canada.

NATIONAL POST

** BHP Canada said on Thursday the cost to expand its massive potash mine near Jansen, Saskatchewan will be $6.9 billion instead of $4.9 billion, because of costly delays and materials.