NEW YORK - If you want to usher in 2000 with a romantic kiss on the roof, you might have to walk there. Some New York City building managers plan to shut down elevators just before midnight on Dec. 31.

The residential building managers fear a Y2K glitch in the power grid could trigger wide-scale blackouts, stranding people in elevators. At about 11:50 p.m. on New Year's Eve, the elevators will be taken to the ground floors and left there for 20 or 30 minutes with their doors open.

It's just a precaution, said Craig Lamb, president of J&C Lamb Management, which runs 19 buildings.

"We're trying not to be alarmist,'' Lamb told the New York Post, "but we don't want anyone ringing in the New Year stuck in an elevator.''

Con Edison officials and elevator operators, however, have assured there will be no interruptions in their services.

"Everything is a go,'' said Ron Massip of Mainco, one of the city's biggest elevator companies. "We ran a series of tests on all of our systems that would be affected, and they're all Y2K compliant.''

But, Massip said, Mainco will keep computer technicians on hand - just in case.