Skanska Construction will start work in late Summer on the new building block, expected to cost around £20m to build.
An existing building on the site will be demolished and Skanska plans to re-use its existing basement retaining walls to reduce the amount of concrete used.
The new building planned at 11-19 Monument Street was designed by Make with Arup as M& E Consultants on the job.
Skanska Project Development’s Neal Pickering said: “The site was acquired last year with the intention of delivering 85,000 sq ft of Grade A offices.
“Around 40,000 sq ft of the office space is being occupied by Skanska UK and the remainder of the space being let to occupiers looking for offices upwards of 10,000 sq ft in a prime city location.”
The existing building will be demolished to make way for a striking office building (below) that will be used for Skanska UK offices