Irish developer Johnny Ronan's plans for a 44-storey hanging gardens have been criticised for being too extreme for Dublin, a city in need of more housing.
Mr Ronan's hanging gardens vision is more akin to a plan for Manhattan than Dublin, said Dublin Lord Mayor Nial Ring.
Meanwhile, Jan O'Sullivan, the spokeswoman on housing for the Labour Party in the Republic, said there was a lack of social housing in the North Wall Quay area of the capital and that was a "priority", rather than hanging gardens.
Mr Ronan's 'Project Waterfront' plan, with a 50/50 split between residential and commercial development, is almost twice the height of his 22-storey Tara Street development, which was given the go-ahead by Ireland's planning authorities last month.
The developer is aiming to build two towers on the last major vacant site north of the Liffey, near the East Link Bridge, promising jobs for more than 10,000 construction workers.
This site was previously occupied by a series of run-down warehouses. The proposed main tower on the quayside is 155 metres at its highest point, dwarfing the 51-metre Liberty Hall.
Mr Ring said he found a "very negative reaction" to the proposals: "Most people really don't like it. Is it Johnny Ronan's gardens of Babylon?
"This isn't Manhattan. This is Dublin and right now we have a huge housing crisis and this isn't something we need."