Norway’s sovereign wealth fund has written down the value of its UK property holdings by 5% following Britain’s 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 (€23.6bn) real estate portfolio in London and 23% in the UK – over twice its exposure to French property.

Norges Bank Investment Management (NBIM) said in its second-quarter report that the fund’s external valuers decided against any changes to the UK portfolio’s 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%.

β€œThe increased volatility and uncertainty in the market are assumed to have a negative effect on property values,” NBIM said.

β€œThe 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.”

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’s overall impact saw real estate produce a -1.4% return, below both the sovereign fund’s equity holdings (0.7%) and its fixed income holdings (2.5%).

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

β€œAfter a period of relatively stable markets at the beginning of the quarter,” Grande continued, β€œthe British decision to leave the EU sparked a sharp decline in Europe.

β€œMarkets recovered relatively quickly, but with major variations between sectors,” 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’s 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.