The decision over whether 1,300 new homes can be built in seven tower blocks at Brighton Marina is now not expected until mid-July.
Campaigners had expected a final verdict on the controversial proposals this month but the Planning Inspectorate has confirmed that the announcement will be delayed – in part because of the general election.
Planning inspector Martin Pike, who chaired a six-week public inquiry into the scheme last November and December, will make his recommendation to the Government on April 20.
The Secretary of State for Communities and Local Government is then expected to make a decision before a July 13 deadline.
Labour MP John Denham was the Secretary of State until the dissolution of Parliament this week for the election.
The delay means that the decision could potentially be taken by the Conservatives if they are successful at the polls on May 6.
Local Tories have previously opposed the development.
Building firm Explore Living’s plans for the homes, along with shops, offices and public spaces on a site currently occupied by Asda and the marina car park were rejected by Brighton and Hove City Council planning committee last year – against the recommendation of planning officers.
The company appealed against the decision, prompting the public inquiry.