US-based developer Thomas Enterprises is planning a £150m conversion of the Grade II*-listed former Port of London Authority building into London's first six-star hotel with spa.

The building, 10 Trinity Square, is part of the Tower of London World Heritage Site. Architect Woods Bagot has been commissioned to restore the building and to remove a number of 1970's 'insensitive' extensions as well as convert it into a 131-bedroom hotel. There will also be 30 apartments. Thomas Enterprises acquired the site in September 2006 for £100m. A decision on the planning application is expected to be made by the City Corporation at the end of March.

Rob Steul of Woods Bagot, told the Evening Standard: "Our vision for 10 Trinity is to create the finest hotel in London and restore one of its most important Grade II*-listed buildings. There is no other site like this in the capital, which offers a position near the City and Canary Wharf, while overlooking a World Heritage site at the Tower of London. "We have been working with English Heritage and the City to develop a design which removes unsympathetic sixties extensions and restores the central rotunda space to the building, which was lost during the Blitz.

"The proposed new extensions blend the listed building with a modern glass-domed extension in the courtyard. This immense 30-metre diameter central space will become the new heart of the building, and rival the scale of the Great Court of the British Museum." Details: http://www.10trinity.com/