New images have been revealed showing how Three Snowhill in Birmingham city centre will look.
The building, which will complete the estate next to the railway station of the same name, will be the largest city centre office development outside of London when it completes in 2019.
The artist's impressions have been released by developer Ballymore and its funding partner M&G Real Estate which committed £200 million to the project last year.
The finished building will have 420,000 sq ft of grade A office space and be 17 storeys tall.
Ballymore has been developing Birmingham's four-acre Snowhill Estate for the last ten years and led the project to build Two Snowhill which is now home to HS2, the Government's company building a high-speed rail link between the city and London.
Project director Richard Probert said: "By the time the Snowhill estate is finished in 2019, we will have delivered almost one million sq ft of prime office space and more than three acres of new public realm, including the St Chad's open space, the Winter Garden, Colmore Square piazza and water feature and the metro viaduct and boulevard, alongside Europe's longest green wall.
"However, I think our real legacy will have been our success in growing the prime city core to the north of the city and kick-starting the regeneration of the Snowhill area."
Aaron Pope, director of asset management at M&G Real Estate, added: "Demand for high-quality grade A office space in Birmingham is on the rise and this trend is set to continue with upcoming infrastructure projects such as HS2.
"Three Snowhill will offer this much-needed space in a key location at the centre of the city."