Qatar Investment Authority and Brookfield Property Partners have offered 2.6 billion pounds for the majority owner of London's Canary Wharf, higher than an earlier approach but still short of Songbird's own expectations. The partners said on Thursday they would offer 3.50 pounds in cash for each share in Songbird Estates, 55 pence a share more than their bid last month, which Songbird rejected, saying it "significantly undervalued" the owner of the business district in East London.