The pair clashed after Liverpool Vision withdrew its support for the Fourth Grace Project, creating a conflict of interest for October.
The agency worked for Liverpool Vision for two years, managing its media
relations. Liverpool Vision chief executive Jim Gill released October from its contract last week.
A statement from the agency said: ‘Before working with the Fourth Grace Consortium, we discussed with Liverpool Vision any possible conflict of interest. All parties agreed that there was no conflict as long as we were working towards a common aim.
‘However, the recent withdrawal of public sector support for the project changed our position.’
Dubbed ‘The Cloud’, the proposed building would add to the Liver Building, the Cunard Building and the Port of Liverpool Building.
Liverpool Vision’s main partners are Liverpool City Council, the Northwest Development Agency and English Partnerships, which blocked the funding, citing spiralling costs.
A Liverpool City Council spokesman said: ‘Two scrutiny panels are looking at the project to see how it was managed and what can be learnt from it.’