Brooklyn Academy of Music chairman Alan Fishman holds the unique distinction of having presided over Washington Mutual as its CEO for only 17 days in September 2008 before the bank’s assets were seized by the feds in what became the largest bank failure in US history.

Fishman earned $19 million for three weeks of work, while the bank’s stock price crashed from $45 a share to pennies.

Eight years later, Fishman and his wife, Judith, have bought a $7.4 million penthouse at 1 Pierrepont St. in Brooklyn Heights.

The five-bedroom, four-bathroom co-op comes with a dining room, a library — which may or may not hold books on the economic crash and lessons learned — as well as herringbone floors.

The 25-foot-wide living room comes with a woodburning fireplace and “space for a grand piano and multiple seating areas,” according to the listing.

There’s also a chef’s kitchen, a large butler’s pantry and a windowed laundry room with wine storage.

The 24-unit building boasts amenities including a rooftop solarium with an outdoor terrace and a landscaped private garden.

The listing brokers were Corcoran’s James Cornell and Leslie Marshall.