NEW YORK — Working the overnight shift in a building where rents top out at $8,000 a month, concierge David Long has a front-row seat into how spendthrift some residents of this city’s luxury properties can be.

Long, 38, accepts and secures about 300 packages each night for the residents in his 370-unit building along the East River in Manhattan. And some nights, the food deliveries he intercepts for tenants never stop arriving — one apartment can order a dozen DoorDash and Uber Eats meals in a single day, he said.

Long is among the 34,000 doorman, concierges, building cleaners and property managers threatening to strike over stagnated wages in an increasingly testy battle over who can afford to live and work in New York. The debate is centered around what’s considered a fair wage for workers who support an estimated 1.5 million residents, many of whom live in comfortable conditions that far outstrip those who serve them.

The dispute sets up yet another test for a labor movement that appears poised for a renaissance under new Mayor Zohran Mamdani, a democratic socialist. It also poses a challenge for property owners who fear higher labor pay will collide with soaring insurance, regulatory and utility costs.