NEW YORK — Restaurants, a key part of New York City’s identity, will be allowed to open with outdoor seating Monday as the city enters the second phase of easing coronavirus restrictions, Mayor Bill de Blasio said Thursday.

The outdoor seating plan will provide a lifeline for New York’s crucial restaurant industry as the city emerges cautiously from lockdown.

“We have to save this industry,” he said. “It’s part of our identity.”

Restaurateurs will be able to go online starting Friday to apply to open with seating on the sidewalk, in a backyard patio or using parking spaces. He estimated that 5,000 restaurants employing 45,000 workers would be able to open starting next week.

Offices, hair salons, retail stores and playgrounds in public parks will also be allowed to open during Phase 2 of the reopening, de Blasio said. He said 150,000 to 300,000 more people should be back at work.

Gov. Andrew Cuomo had indicated that the city would be ready for Phase 2 on Monday, but de Blasio had said previously that he thought it might take longer. De Blasio said Thursday that he has spoken with the governor’s office about the reopening plan and that “there’s been a high degree of unity.”