An upscale condo for Manhattan's Hudson Yards

New York

A WEAK luxury market may be making some developers nervous. But the developers of 35 Hudson Yards, a 72-storey condo-hotel-office hybrid where sales of 143 luxury apartments will start in mid-March, are confidently predicting a speedy one-year sellout.

"It's not just a building," said Stephen M Ross, chairman of the Related Cos, which has partnered with the Oxford Properties Group on the project. "You're really buying int…