BRIEF-Norway's wealth fund raises stake in London property

Sept 4 (Reuters) - Norway's sovereign wealth fund said on Monday:

* Norway's sovereign wealth fund expanded its partnership with the Crown Estate, acquiring an additional 25 percent interest in 20 Air Street in central london

* Norway's sovereign wealth fund says this brings Norges Bank Real Estate Managements total share up to 50 percent in the property

* Norges Bank Real Estate Management acquired its additional 25 percent interest from The Crown Estate for 112.5 million pounds, which corresponds to 450 million pounds on a 100 percent basis Source text for Eikon: http://bit.ly/2iV5pLG (Reporting By Terje Solsvik, editing by Gwladys Fouche)