Outside a pretty walkup building at 242 East 60th Street is a postwar-style sign for an apartment building called Ambassador Terrace, a white-brick highrise in the East 40s.
I’m sure the interiors and lobby at the Ambassador have undergone upgrades over the years. But you wouldn’t know it from the sign, with its wonderful two-letter prefix on the management office’s phone number.
LO for Longacre, a reminder that Times Square was Longacre Square until 1904.
What’s also great is the two-digit zip code: 18.
These short postal codes were instituted in the 1940s to help speed mail delivery. They were replaced by the 5-number zip codes we use today in the 1960s.
Here’s more examples of old phone exchanges found around the modern city. And postal codes too: this one was hiding on East 10th Street.