The firm specialises in renting business and office space to companies and is already spending £75m on revamping seven sites across London.

The extra £128m is earmarked for another 11 properties in the area to provide a further 560,000 sq.ft. of new and upgraded space.

Four of the schemes already have planning or planning is not required, with the remainder at the earlier design and planning application stages.

The announcement came as Workspace posted strong half year results to September 30 2014 with pre-tax profit up 61% to £173.7m.

Chief Executive Officer Jamie Hopkins said: “We are progressing well with the next phase of our redevelopment and refurbishment activity, as well as looking to acquire further complementary properties in strategic locations across London where we can utilise the strength of our brand, marketing and asset management skills to generate superior value for our shareholders.”