Project team includes developer Stanhope and engineer Arup

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RSHP has lodged plans with Camden council for an extension to the British Library

Rogers Stirk Harbour and Partners has lodged plans for its controversial extension to Colin Wilson and MJ Long’s grade I-listed British Library in Euston.

Revised designs for the scheme, which were first revealed in July last year, will require the demolition of buildings to the north of the library, including the 2007 British Library Centre for Conservation (BLCC) designed by Long & Kentish, which caused howls of protest

The site has also been earmarked as a temporary construction compound for the mothballed Crossrail 2 project.

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The scheme will include shafts and tunnels for the mothballed Crossrail 2 project

The developer, a JV between Stanhope and Mitsui Fudosan, have secured the site by agreeing a deal with Transport for London which will see it carry out the work to build 5,000 sq m of shafts and passageways descending seven storeys beneath RSHP’s extension in case the railway is revived.

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New library space will be located on the lower levels

More details of the 97,000sq m scheme have emerged in the plans, submitted to Camden Council last week.

The work for Crossrail 2 will include the main civils and structural elements of the Euston St Pancras Station eastern shaft and passenger subway tunnel.

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The library space will be connected to the British library

Arup has also been appointed to the project, with DSDHA working on the scheme’s public realm.

The amount of commercial space has been expanded from 73,000sq m to 76,000sq m. This will be aimed at life sciences tenants and other businesses wanting proximity to the area’s emerging Knowledge Quarter. As well as PLP and HOK’s Francis Crick Institute, a £1bn pharmaceutical centre designed by AHMM on a nearby site was given the green light last year.

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Retail space will also be offered on the ground floor

The amount of library space, which will occupy the first two floors including a link to the main library, has stayed the same at 10,000 sq m. This will include a public foyer and new headquarters for the Alan Turing Institute.

When the plans were first unveiled last year they sparked anger among architects and historians, with Patrick Lynch dubbing the designs a “third-rate wedge of nothing”.

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The plans have stirred up controversy with campaigners