UPDATE 1-Songbird Estates says worth $4.4 bln, more than takeover offer

LONDON, Nov 28 (Reuters) - Songbird Estates, the majority owner of London's Canary Wharf, said an upturn in property markets means it is now worth 2.82 billion pounds ($4.42 billion), more than the takeover offer from Qatar Investment Authority (QIA) and Brookfield Property Partners .