Glenn Howells’ toppled the office block to open up views of a listed Victorian arched gable to Lime Street station in Liverpool.
"We have created an open and dramatic civic gateway with welcoming views of Liverpool’s skyline and station architecture, said the practice.
"Spaces paved in york stone form a series of plateaus, striking a relationship between the new public realm and the simple expanse of St George's Plateau.
"These spaces create ease of movement, allowing for the natural ebb and flow of inward and outward commuter travel patterns."
The design includes tiers of seating terraces alongside the station archway and a wide upper terrace that may form the site of a new station café.
Artist Simon Faithful was commissioned to design a series of etchings, which have been incorporated in the glass station arches and the surrounding paving.
James Holyoak, an architect at Glenn Howells, said the design vision focused on delivering an accessible, well-functioning space.
"We wanted to create a world-class setting for the 19th-century station frontage and recreate a high-quality link the station to St George’s Hall and the cultural quarter."
The project was a partnership between the Homes and Communities Agency, Liverpool Vision, Liverpool City Council, Network Rail and Mersey Travel.
Funding came from HCA, Northwest Regional Development Agency, European Regional Development Fund and the Railways Heritage Trust.