Task: Question Answering
Input (English): Passage: The Broadmead shopping centre was redeveloped in the early years of the century, involving the demolition of one the city's tallest mid-century towers, Tollgate House, in the construction of Cabot Circus. The former Bristol and West Tower was reworked into a glass skyscraper with glass panels in place of its concrete outer cladding. In 2005, the city council undertook extensive consultations about the future of tall buildings in Bristol, and identified support for new tall buildings so long as they are well designed, sustainable, distinctive and 'fit' into the existing urban landscape.In May 2007, proposals were announced to build approximately 753,000 square feet (70,000 m²) net of homes, offices, and business premises in the St Pauls area. The development, if it had been approved, would have included a 600 feet (183 m), 40-storey tower next to the M32 motorway, acting as a new entrance to the city. The tower would have been a similar shape to the Swiss Re "Gherkin" tower in London.
Planning for the large Finzels Reach development across the Floating Harbour from Castle Park, including the old Georges Brewery buildings, was first granted in 2006 but progress was hampered by the recession and the developers went into receivership. By 2015 the development is part complete with the historic waterfront facade still awaiting regeneration.
Since 2013, Bristol has seen an increase in buildings being built or office blocks being converted for student accommodation. These include Froomsgate House, St. Lawrence House (a former office block) in Broad Street, the former Magistrates Court site and New Bridewell Tower. 
Question: The Broadmead shopping centre redevelopment involved the demolition of which city's tallest mid-century towers?
Output (English): Bristol.