This townhouse sure was something to write home about!

Built in 1860 by President Martin Van Buren for his daughter, it is also where famed playwright Tennessee Williams lived in the 1940s — just before the Broadway debut of his most famous work, “The Glass Menagerie.”

Now a duplex apartment in this four-story, six-unit co-op is on the market for $1.84 million.

Shortly after Williams moved in, he wrote a postcard home to his dad, C.C. Williams.

The postcard, dated 1940, reveals that even back then, living with roommates helped people afford the high cost of moving to New York to follow their dreams.

The postcard, which has remained in the home, reads: “Settled in lovely new apt., 151 E. 37 St. 3 big rooms and other a roof with skyline & view of river for $18.50 (3 of us) each (per month) Also piano & complete furnishings.

Everything is going nicely.

Summer weather has arrived.

Hope your moving is not too difficult.

Love, Tom.” (That was his real name.) Williams also penned “Cat on a Hot Tin Roof” and “A Streetcar Named Desire.” The three-bedroom, two-bathroom apartment includes three fireplaces, high ceilings,a skylight, exclusive roof rights and skyline views.

The listing brokers are Corcoran’s Paul Gavriani and Vincent Falcone.