The world's biggest developer, Tishman Speyer, is reconsidering plans for a skyscraper in the City of London after John Prescott called in the nearby Heron Tower scheme last week.
A spokesperson for the US firm, which is acting as development manager for the project, said: "In the light of what happened with the call-in of Heron Tower, we will have to look at its implications." Chicago-based architect Helmut Jahn is being linked to the scheme, on a site in Bishopsgate owned by German property giant DIFA. Helmut Jahn worked with Tishman Speyer on the 109,000 m2 European headquarters for Sony in Berlin.

Montagu Evans is advising Tishman Speyer on planning. No decision has been made on the tower's height. The spokesperson said: "We are a long way off deciding what will be appropriate on the site." Prescott called in Heron Tower, proposed for a City site by developer Heron, because of concerns about its impact on the surrounding area and over whether it complied with national planning policy.

London mayor Ken Livingstone has already recommended that the Corporation of London approve the 43-storey project, designed by US architect Kohn Pedersen Fox.