There have been 10 such deals this year totalling £2.175bn, which it claims to be a record both in terms of the number and volume of deals in this category.

These transactions have made up 69% of the total turnover in the West End market in 2017.

Asian investors have been responsible for just under half (49%) of these deals, up from the 19% they were involved in for the whole of last year.

So far this year, three £100m-plus acquisitions have been transacted by UK investors, the same number that was recorded for the whole of 2016.

Savills reported that the 11 transactions that took place in May totalled £583m, which takes total investment in the year to date in the West End to £3bn.

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Paul Cockburn, head of the West End investment team at Savills, said: “A key characteristic of overseas demand is their willingness to target both scale and quality.

“With this comes the current high level of liquidity for large lot

“Such is the demand of late, there again seems renewed downward pressure on prime yields."

May saw big deals in the West End market, with Savills Investment Management – who acted on behalf of the Employees Provident Fund – selling the freehold interest of 11-12 St James’s Square to Chinese Estates for £174.99m.

According to Savills, prime yields in London’s West End market remained at 3.25% for the fifth successive month.