Another major retrofit on the cards as plans unveiled to freshen up 1970s City block

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Seifert-designed St Magnus House will be turned into a visitor destination on the Thames Path

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Buckley Gray Yeoman has unveiled plans to overhaul a Richard Seifert-designed brutalist office block in the City of London as the move towards retrofit work continues to gather pace.

Retrofit work accounted for , according to the latest crane survey by Deloitte.

Buckely Gray Yeoman has submitted a planning application for the refurbishment of St Magnus House, a late 1970s building at 3 Lower Thames Street on the banks of the Thames just east of London Bridge.

Originally intended to house part of the new Billingsgate Fish Market, the nine-storey building was converted to office use halfway through its construction when it was decided to move the market to Canary Wharf instead.

It is now considered by the scheme鈥檚 developer Pegasi Management Company Ltd outdated but with 鈥渋mmense potential鈥� due to its location with views of Tower Bridge and the Shard.

Pegasi said it wants to reinvent the building as a 鈥渂est in class鈥� workplace, enhance the site鈥檚 public realm to make it greener and more characterful, and turn the building into a visitor destination with a new riverside cafe.

The plans would also see the creation of a new double-height lobby linking Lower Thames Street with the river path, replacing blank concrete walls with new glazing, building a cycle hub, installing new feature lighting and painting an exterior staircase red.

Two existing office spaces on the first floor would become a restaurant, while upper office levels would be refurbished with new perimeter windows and terraces overlooking the Thames.

St Magnus House

St Magnus House as it currently looks. It was designed by Richard Seifert and built in the late 1970s as the first phase of the new Billingsgate Fish Market, although it was converted into office space halfway through construction.

The building鈥檚 top floor, which currently contains plant, would be transformed as an office amenity space and roof garden.

The project team so far includes QS Gardiner & Theobald, project manager Knight Frank, planning consultant Gerald Eve, landscape architect Space Hub, services and sustainability consultant Ramboll, structural engineer Heyne Tillett Steel and building control consultant Sweco.

The scheme is the latest in a series of major retrofits in the Square Mile recently submitted for planning, including proposals by Orms filed last week for a refurbishment and expansion of Deutsche Bank鈥檚 UK headquarters at Winchester House.

Further up the river, Bennetts Associates next to Blackfriars station that includes refurbishments of several existing buildings.

Last month, contractor Mace was appointed to upgrade a Foster & Partners-designed block near St Paul鈥檚 Cathedral. The scheme, designed by Gensler, will see an extra storey and a 5,000sq ft roof garden added to the building at 10 Gresham Street.