Birmingham-based construction firm Robins & Morton has completed two office buildings and a parking deck in the Redstone Gateway office park next Redstone Arsenal’s main gate for defense contractor Northrop Grumman.

The company said the $100 million project included the two “build to suit” facilities and a parking deck. Each building is five stories tall and built in the new “tilt-wall” method that constructs each wall flat on the ground and raises it into position.

The two buildings contain office space, program management and engineering design space, an integration laboratory, a data center and a 350-person auditorium.

“I’d like to commend everyone who helped make this campus a reality – COPT, Northrop Grumman, design team partners, our trade contractors and our Robins & Morton team members,” Robins & Morton Project Director Stephen Flournoy said. “This was $100 million of greenfield, highly customized office space completed within an aggressive project deadline. We’re thrilled to see Redstone Gateway continue to grow under our client COPT.”

COPT is short for Corporate Office Properties Trust, a privately traded real estate company partnered with Montgomery-based Jim Williams & Associates in the Gateway project. Robins & Morton served as the general contractor, and Powers Brown Architecture was the architect.

The Gateway development also includes land just inside Redstone Gate 9 for companies wanting the extra security of being behind the arsenal’s fence. Robins & Morton said it is working on a new 215,000-square-fot building behind the gate.