Greenberg Traurig's London office has continued its expansion with 21% staff headcount growth during the last financial year, limited liability partnership (LLP) accounts filed with Companies House have shown.

Average staff headcount at the US firm's City base grew from 47 to 57 during the 12 months ending 31 March 2017.

Staff costs subsequently increased by 29% during that period, to £5.2m.

The accounts also reveal that turnover at the LLP grew by 11% during financial year 2016-17, from £15.6m to £17.3m.

The accounts also revealed that capital contributions from Greenberg Traurig partners grew by 405% to £1.39m in the 2016/17 financial year, up from £275,000.

Net profit at the UK LLP also increased by 8% from £8.4m to £9.1m during the last financial year.

The firm made a number of significant hires to its London office at the start of 2017 from the then-collapsing European arm of King & Wood Mallesons (KWM).

Greenberg hired real estate funds partners Steven Cowins and Marc Snell, real estate partner Matthew Priday, corporate finance partners Michael Goldberg and David Fitzgerald, and tax partner Clive Jones from KWM.

Greenberg vice-chair Paul Maher told Legal Week: "The KWM team has been busy across all areas – funds and real estate brought a lot of work over, and the corporate real estate and tax teams have been busy too. We had a very strong calendar year."

Like most US firms, Greenberg operates to a calendar financial year. For the 2016 year, the firm reported $1.37bn (£1.01bn) in gross revenue – an increase of 4.2% on 2015. The firm's profit grew by 6.4% to $476.5m (£391m). Profit per equity partner grew 4.7% to $1.5m (£1.2m). The firm's profit margin was 35%.

It is understood that revenue at the firm's London office increased by 80% during the 2017 calendar year.

In September last year, the firm significantly bolstered its Warsaw office with the hire of an 11-lawyer real estate team from Hogan Lovells, including local practice head Jolanta Nowakowska-Zimoch.