They argued that it would have an adverse impact on the surrounding conservation area and views from Regent's Park.
In March, Chelsfield commissioned architect Kohn Pedersen Fox to study the impact on the urban environment of changing the height and massing of the tower.
Kohn Pedersen Fox supported Richard Rogers Partnership's proposal for a tall building. "With the loss of the original Rogers scheme you lose a wonderful, large public space at the base of it at Paddington Basin," said Lee Polisano, principal at Kohn Pedersen Fox.
"By having the same density at lower height, you have a very reduced public space."
However, Westminster council was inflexible, and last month approved a plan that enshrined a 100 m height limit for buildings in the borough
Richard Rogers Partnership will submit a fresh planning application to Westminster council this month for the revised scheme.