California's coastal development agency has postponed voting on U2 guitarist The Edge's plan for a cluster of mansions overlooking Malibu at the musician's request.
Staff for the California Coastal Commission recommended that officials reject The Edge's project at its meeting.
The proposal led by the musician, whose real name is David Evans, includes five multi-level homes ranging from 7,220 to 12,785 square feet to be built on a ridgeline in the Santa Monica Mountains overlooking Malibu.
The guitarist has said the mansions will be some of the most environmentally sensitive ever designed in the world.
But the green pitch has not got very far with neighbouring residents, environmental groups, the Santa Monica Mountains Conservancy and even the National Park Service, which raised concerns about biological and visual impacts in such sensitive habitat.
"We believe the intensity of this project - in terms of the amount of new construction, location relative to surrounding habitat and topography, scale of grading and significance of infrastructural improvements - is unprecedented for single family residential development in the Santa Monica Mountains," wrote Woody Smeck, the agency's Santa Monica Mountains National Recreation Area superintendent in a letter to the commission.