https://screenrant.com/is-arconia-a-real-building-only-murders/

The Arconia is essentially one of Only Murders in the Building's most important characters but is the New York City building a real place?

You can Google it. Yes, it's a real building. But see below:


"Is the Arconia a real place?
The Arconia is, in fact, a real building in New York City - it just doesn't go by that name. The production of Hulu used The Belford building in New York City for exterior shots of The Arconia (via House Beautiful)."