(Updated at 2:50 p.m.) Heavy demolition is underway at the corner of Wilson Blvd and N. Randolph Street, as portions of the old Ballston Common Mall are demolished to make way for the renovated Ballston Quarter shopping center and apartment tower.

Demolition crews from Celtic Demolition are at work tearing down the corner of the building that contained one of the mall’s main entrances and the former Macy’s furniture store. Crews are hosing down the debris with water to reduce dust.

One tipster who works across the street from the mall, at the National Science Foundation, said yesterday — after demolition started — that the close proximity of the demolition to moving traffic was concerning.

“You have to see the way they are demolishing the Ballston Mall,” the tipster said. “It is such a recipe for disaster. The debris is falling onto [the street] as cars and buses are driving by.”

The extensive renovation project is expected to wrap up in 2018.