The $1 billion Nylex sign silo development has hit a hurdle, with the developer ordered to revise the first stage of its massive proposal for the site.

Among the orders from the state planning tribunal is for the number of one-bedroom apartments in the project to be scaled back, and for more two and three-bed units to be included.

Developer Caydon's plan for apartment towers that would replace Richmond's old silos and Nylex clock.

And the developer was told that its proposed towers would have a visual impact on "prominence and landmark qualities of the Nylex sign and clock, and the 1960s silos that support this structure".

Joe Russo runs the Caydon Property Group, which on Monday was ordered back to the drawing board on its Malt District project.