The centre features marble and wood floors, leather armchairs, carpeting and high lighting.
General manager Kelson Campbell said: “The Derby centre is the largest we have built to date. It means we can now offer an even better service to Lexus owners in Derbyshire.
“I want to ensure that potential buyers and existing customers receive only the highest levels of service, and we’ll go the extra mile to offer that.”
There are plans for local events to attract both private and business customers. Additionally, cars can be demonstrated to potential buyers either at their home or office.
On the service side there is while-you-wait servicing, with daily newspapers, tea and coffee available in a lounge within the new showroom. A 13-bay workshop is included on the site.
The formal launch of Lexus Derby is due to take place on February 1.