The Twentieth Century Society has attacked AHMM’s proposals to redevelop Denys Lasdun’s IBM building on London’s South Bank, dubbing them “heavy handed” and harmful to the setting of the architect’s neighbouring National Theatre.

While the NT is listed at grade II*, Lasdun’s IBM building is only locally listed – although the campaign group is seeking a grade II designation for the brutalist structure, built between 1980 and 1983.

Its observations come after AHMM lodged its proposals for the scheme with Lambeth council. If approved, the redevelopment would add more than 20,000sq m of new business space to the block and bring its terraces “back to life”.

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