Plans to build a 115m tall observation tower near the Olympic Park in Stratford should be subjected to heightened inquiry before the project is given the go-ahead, the Commission for Architecture and the Built Environment (CABE) has said.
A CABE spokesman said it was important, especially given the tight deadline for completion, that the structure matched the artistic intent of the design, which was drawn up by Anish Kapoor.
He added that further work was required on how this could be achieved, especially with regards to the design of the viewing platforms, lift, stairs and downpipes, and integration with the landscape of the Olympic Park.
The CABE also expressed concern that the requirements of operating the building as a tourist attraction, including circulation and queuing, had not been properly explored.
A final decision will be made on 24 August.