Once complete, the building will stand 105.5m high, with an apex 246m above sea level.
The 26-storey building at 103 Colmore Row will comprise 223,631 sq ft of office space over 20 floors, 7,665 sq ft of restaurant space on the ground and top floors and also feature a winter garden, an 18th-floor terrace and multi-purpose lobby business lounges.
The contractor has already begun site surveys and thescheme has been designed by architects Doone Silver Kerr.
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Rod Stiles, regional director for BAM Construction in the Midlands, said: “Our appointment to create 103 Colmore Row means that BAM is engaged on about one quarter of a billion pounds of commercial developments within half a mile of each other in Birmingham’s central business district.
“This is a testament to our credentials and our track record in the city.
“We’ve been working with our partners at Sterling and Rockspring already and are keen to start what will be a memorable addition to Birmingham’s real estate.”
The main substructure works will begin in early June, with completion scheduled for Q3 2020.
Waheed Nazir, corporate director economy at Birmingham City Council, added: “The commitment to this major new building will bring high-quality office space to the heart of an expanding central business district and shows that Birmingham continues to be a hugely attractive place to invest and do business.”