London property company Workspace said on Wednesday its Blackrock Workspace Property Trust venture has sold four light industrial properties to Westbrook partners for £32.1m.Blackrock Worspace is a joint venture between Workspace and fund manager Blackrock UK, where Workspace holds a 20% interest. The two companies merged in 2011.The four properties sold were located in Southall, West Drayton, kingston-Upon-Thames and Croydon and were sold at a 3.8% premium and a capital value of £176 per sq ft.Shares in Workspace were up 0.49% to 825p on Wednesday at 12:21.