After hours of taking a wrecking ball to the side of the Leaning Tower of Dallas, crews on Monday attempted to finish the work of the implosion that failed to topple all of the former Affiliated Computer Services building.

KXAS-TV (NBC 5) live-streamed the demolition, which will take three to four days to complete.

The stubborn 11-story tower at 2828 N. Haskell Ave. near downtown Dallas became an internet sensation after it defied destruction Feb. 16.

News of the tilted core of the building spread quickly as footage of the failed implosion was shared online. North Texans soon began gathering nearby, posing for pictures as if they were holding up the remains of the building.

Partial implosions are not uncommon, Lloyd Nabors said afterward.

“These cores can be really tough,” he said. “We did a lot of work to prep for it, but unfortunately it didn’t come over.”

Mohammad Najafi, director of the University of Texas at Arlington’s construction management program, said that “definitely something went wrong,” however. He noted that building implosions usually involve explosions at short intervals, starting at the structure’s perimeter and then moving to the core.

“I think probably that the delay … didn’t activate when it got into the core of the building,” he said. “That delay process helps with the safety, dust and flying objects. The delay helps it, but it should have come down.”

After the remaining structure is demolished, the lot will become the site of a $2.5 billion mixed-use development named The Central. The project is expected to include 5 million square feet of residential, office, retail, dining and entertainment space.

Staff writer Nataly Keomoungkhoun contributed to this report.