The recently completed pale brick building on a busy corner includes a rooftop garden, yoga studio, and ground-floor retail.

A gem of an aerie at 170 Fifth Ave. has a dazzling amenity that’s rare to find in New York — and now a new generation stands to get it.

Visitors to New York City’s famed Flatiron Building may have noticed the landmark’s lesser-known neighbor — a narrow high-rise that would be modest if not for its extravagant gold dome. Now ...