Leslau has been chairman and chief executive of Prestbury group of companies, which has invested in and managed more than £10bn of property assets since he founded it in January 1998. He is a Fellow of the Royal Institution of Chartered Surveyors and was co-founder and chief executive of Burford Holdings for 13 years until 1997, having created a £1bn net worth company and delivered 1,300% NAV per share growth over a 10-year period as a quoted company. He sat on the board of Max Property Group, which was floated in 2009 and sold to Blackstone for £650m in July 2014. He and his management team floated Secure Income REIT and recently merged the company with LXI REIT, creating a business with £4bn of gross assets, where he continues to be one of the largest shareholders and a non-executive director.