Plans for a £300m regeneration scheme that will create a new gateway to Birmingham have been revealed.Calthorpe Estates and development company U+I are leading the project to regenerate a 10.7-acre plot along Hagley Road.The scheme, known as New Garden Square, will begin next to the Plough and Harrow Hotel and stretch down to Five Ways Island.It will replace a number of office blocks, built between the 1950s and 1980s, to create a mixed-use destination. The grade II-listed building facing onto Hagley Road will be retained.Public consultations on the proposals will begin on 27 October and a planning application is expected to be submitted to Birmingham City Council in December.CBRE is advising the developers on the plans and Glenn Howells Architects is designing New Garden Square.