Photo courtesy of Newmark Knight Frank

Environmental services firm Clean Harbors has acquired its Norwell headquarters from The RMR Group of Newton for $27.5 million.

The 104,008-square-foot office building in Assinippi Park was built in 1995 and has been Clean Harbors’ headquarters since 2004. It’s currently undergoing a capital improvement program including a renovated cafe, new patio and upgrades to office space.

Newmark Knight Frank’s capital markets team oversaw the transaction.

“42 Longwater Drive benefits from its positioning along the Route 3 South corridor, which offers direct access to the South Shore’s highly sought-after employee base,” Newmark Knight Frank Executive Managing Director Matthew Pullen said in a statement.