The condo has its own “guest apartment” and was once part of Tiffany & Co.’s headquarters A Union Square Park-facing condo loft with its own “guest apartment” just listed for $10.495 million. The building, 15 Union Square West, once served as Tiffany & Co. headquarters. The 2,849-square-foot loft has three bedrooms, three bathrooms, a partial bath, 16-foot-high ceilings throughout, hardwood floors, marble kitchen island, and arched windows. The 1,415-square-foot guest “master suite” has one bedroom, along with its own guest room, a full kitchen, and one bathroom. Converted into a condo more…

Prepare your calendars—and cameras—for the yearly phenomenon It’s that time of the year again: prepare your cameras and mark your calendars for Manhattanhenge, the moment that happens every spring and summer when the sun strikingly aligns with Manhattan’s street grid. On Thursday, May 30, at 8:12 p.m. and Friday July 12, at 8:20 p.m., you’ll be able to catch the full sunset and on Wednesday, May 29, at 8:13 p.m. and Saturday July 13 at 8:21 p.m., you’ll see half, according to the American Museum of Natural History (AMNH). The best locations to watch it—and take the best pictures—are large cross streets including 14th, 34th, 42nd, 57th, and 79th…

Get a glimpse inside what will be Manhattan’s tallest residential building Extell’s massive supertall at 217 West 57th Street, aka Central Park Tower, launched sales last year, but you wouldn’t know it from looking at StreetEasy. As is par for the course with überpricey Billionaires’ Row towers (see also: 220 Central Park South, 111 West 57th Street), the rollout of residences at the skyscraper has largely been shrouded in secrecy. But the veil will be lifted next week, when the…