The practice has been appointed on a two-phase scheme that will see it completely reimagine the public realm across the Snow Hill masterplan area in the heart of the city.
The first phase of the project will see improvements to the square outside Snow Hill station and creating a "highways solution" that reduced the impact of traffic and makes the area better for pedestrians, while the second phase will see improvements across the Colmore area.
Landscape architect Danny Crump, who is leading the project for Broadway Malyan, said the ultimate aim of the project was to create a public realm befitting a world class district in the UK's second city.
He said: "With Birmingham Cathedral at its heart and flanked by magnificent buildings like the Grand Hotel, the Colmore area really is one of the finest areas of any of our great cities but there are a number of localised physical problems that have a significant negative impact.
"For all the wonderful architecture, this is a road dominated environment with a poor pedestrian experience and an uninspiring sense of arrival to this important commercial hub when leaving Snow Hill Station.
"The heavily urbanised city centre has multiple constraints, many of which have evolved over years of organic growth and change and so we will be working with key stakeholders – fundamentally the people who live and work in the area – to really unravel the components of the place and then deliver a transformational scheme that is both creative and aspiration yet practical and technically sound."
Crump added: "This is an amazing project for Broadway Malyan to be involved in which will set the highest benchmark for city centre public realm and the fact that we are based within the BID district gives us a real insight into the issues and opportunities for the Snow Hill area."
Funding for the project, which is one of the largest schemes of its kind in the UK, has been allocated by the Greater Birmingham & Solihull Local Enterprise Partnership Growth Fund to a joint bid Birmingham City Council and the Colmore Business Improvement District.
Broadway Malyan, whose Birmingham studio sits within the BID area, has been appointed alongside a professional team including transport specialists JMP, civil engineers WYG and mechanical and electrical consultants Hoare Lea.