Norway鈥檚 sovereign wealth fund has written down the value of its UK property holdings by 5% following Britain鈥檚 vote to leave the European Union, citing market uncertainty.

The Government Pension Fund Global has significant exposure to UK property, with 16% of its NOK221bn (鈧23.6bn) real estate portfolio in London and 23% in the UK 鈥 over twice its exposure to French property.

Norges Bank Investment Management (NBIM) said in its second-quarter report that the fund鈥檚 external valuers decided against any changes to the UK portfolio鈥檚 value, as there was a shortage of data on the impact of .

But NBIM decided to writedown the values of its UK property assets by 5%.

鈥淭he increased volatility and uncertainty in the market are assumed to have a negative effect on property values,鈥 NBIM said.

鈥淭he fund has therefore decided to adjust down the estimated value of the property investments in the UK from external valuers by 5% as at 30 June.鈥

The writedown resulted in its unlisted real estate holdings posting a negative return (-1.6%) during the second quarter, while listed holdings fell by 0.9% over the same period.

Although rental income returned 0.9%, the writedown鈥檚 overall impact saw real estate produce a -1.4% return, below both the sovereign fund鈥檚 equity holdings (0.7%) and its fixed income holdings (2.5%).

Trond Grande, NBIM鈥檚 deputy chief executive, said the three months to June only saw the strong fixed income returns due to rate cuts across the globe.

鈥淎fter a period of relatively stable markets at the beginning of the quarter,鈥 Grande continued, 鈥渢he British decision to leave the EU sparked a sharp decline in Europe.

鈥淢arkets recovered relatively quickly, but with major variations between sectors,鈥 he added.

Despite writing down the value of its UK portfolio, NBIM remains interested in the market, and acquired a central London property in the weeks after the Brexit vote.

The sovereign fund as the UK manager was struggling with the liquidity of its flagship open-ended property fund.

Nearly half of the NOK7.2trn sovereign fund鈥檚 UK property was office space at the end of June, with 38.4% in retail, 14.2% in logistics and 1.6% in unspecified other sectors.