Most people who live alone know they’re paying a premium compared to their friends who split rent with partners or roommates. But in no city is this “singles tax” more expensive than in New York City.

New residents have filled over a quarter of the 237 luxury units in new and historic buildings at the former School Sisters of Notre Dame site.

Pennrose, the national housing developer, is closing in on an occupancy target date for Forge, its 13-building, 65-unit ...