Opponents of the proposed West Pier redevelopment have called on councillors to reject English Heritage's report in favour of the project.
The Government's conservation watchdog says two large new shoreline buildings for the restored West Pier in Brighton are acceptable with conditions.
Any harm to the seafront, it says, would be outweighed by the saving of the Grade I listed pier.
But Sue Paskins, from Save Our Seafront, said: "Why have they changed their minds?
"Three years ago they were saying they did not want buildings as high as this. There is an alternative plan which we support and this will not ruin the seafront.
"We are disappointed with this response but it is up to councillors to make up their own minds. The alternative plan means we can have our cake and eat it but that is not so with this development.
"At its highest point, it will be 30ft above the level of King's Road and higher than the tower of Al Fresco restaurant."
Mrs Paskins said the planning committee should hold a special meeting to discuss the pier plan instead of putting it before a regular meeting.
She said: "Does this mean they think the West Pier is of less importance than the station site?
"They held a special meeting for that."
Save Our Seafront has attracted widespread support from conservation societies and residents in the city.
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