The Blackburn Road dealership has enlarged its showroom to fit 16 cars.
The revamp also incorporates a dedicated sales area for Smart, a new customer reception and an approved used display accommodating 55 vehicles. Behind the scenes, a 17-bay workshop will help to reduce lead times on service bookings.
"Our customers have been tremendously understanding throughout the redevelopment but they now have a fantastic retail outlet at their disposal that is much more in keeping with the Mercedes-Benz brand," said Watson-Brown, who has worked in the motor trade for 17 years.
"It's now up to my team and I to deliver the levels of service to match our magnificent surroundings," she added.
"We're now more focused than ever before on ensuring that our customers are completely satisfied with the service that they receive and providing everyone - whether buying a car or having an existing vehicle serviced - with an unrivalled retail experience."
New DP at Mercedes-Benz of Bolton, Claire Watson-Brown