It’s come a long way from its tragic past.

The angular townhouse at 18 W. 11th St. — the exact site where members of the radical leftist organization Weather Underground accidentally detonated a bomb that killed three people in 1970 — is now in contract. The 6,590-square-foot property was most recently listed for $12.95 million.

Details of the contract price or the buyer were not immediately available.

The standing 22-foot property, rumored to have been rebuilt with its now signature angular facade paying architectural homage to the original building’s bombing, comes with approved plans for a major makeover, the listing says. They include making roomy living spaces that lead out to the south-facing, 30-foot-deep garden space; 13-foot-tall ceilings in the basement level; and the addition, a glass-enclosed rooftop penthouse with room for a rooftop lawn, which would bring the townhouse to six stories.

The blasted building was completely torn down following the explosion, but architect Hugh Hardy bought the cleared lot for $80,000 with a design plan in mind. They never materialized, and he ended up selling it to a couple (now deceased) for that same price in 1978 under the condition that they build the home according to his plan, reports say.

A young financier named Justin Korsant bought the spread in December 2012 from their estate for $9.25 million. And with these reconstruction plans in mind, he relisted the townhouse for $13.5 million last June.

Compass honcho Leonard Steinberg, one of the listing brokers, declined comment. Korsant could not be reached by press time.