The refined, sophisticated Residence 4 at 9 Commonwealth is loaded with luxurious features and is ready for new owners. Tracy Campion of Campion and Company is offering it for $5,250,000.

9 Commonwealth Ave. is a spacious, exquisitely designed building, splashed in brilliant sunlight and situated in one of the choicest of Back Bay locations – in between Arlington and Berkeley streets overlooking the Commonwealth Avenue Mall and a short hop away from the Public Garden.

Built in 1861, the edifice went through a massive transformation in 2015, restoring it inside and out and creating six luxury condos in the process.

The refined, sophisticated Residence 4 at 9 Commonwealth is loaded with luxurious features and is ready for new owners. Tracy Campion of Campion and Company is offering it for $5,250,000.

Beth McBride of Campion’s team conducted a recent tour. When the direct access elevator stops at the unit’s lovely foyer, she said, “It’s a really elegant home. They did such a beautiful job here.” That might actually be an understatement.

The home has amazing design with every detail taken into account. With custom moldings, marble and hardwood floors, silk wallcovering, concealed storage and shining lacquered doors, this place has a modern aesthetic that meshes perfectly with its historic detail. If you moved in, you wouldn’t want to change a thing.

Every room in this unit has something unique to recommend it. The expansive living room’s three bay windows let in plenty of natural light along with quintessential Back Bay views. The walls glow softly and so do the silk draperies. Pale oak hardwood floors have dark walnut inlays, adding a subtle touch of charm. The modern chandelier provides contrast to the deep crown moldings that surround the room.

Step through a pair of French doors into the airy front bedroom, which the current owners use as a study. Numerous built-ins ensure that this versatile room will provide storage for any purpose. Light flows in through the huge picture window, illuminating the space in every season.

An adjacent powder room provides for guests. This half bathroom is highlighted by a marble floor, a large pedestal sink and a substantial wall mirror. It would be easy to turn the powder room into a full bathroom if you wanted another one - the plumbing is in place to add a shower.

At the center of the home is the pale gray kitchen. It’s a marvel with quartzite counters, a shiny subway tile backsplash and state-of-the-art appliances.

A built-in Thermador French door refrigerator is king of the kitchen, which also has a Bosch dishwasher and double wall ovens, plus a six-burner Wolf cooktop sporting iconic cherry red knobs.

Storage is everywhere with a generous pantry for non-perishables. The island is the perfect size - it doesn’t take over the kitchen and it provides seating for casual meals. Sparkling French doors lead the way to the dining room.

Your guests will be eager to dine in this space. Its dramatic hand-painted de Gournay wallpaper features garden images, echoing the view through the unit’s front windows. There’s no need for a separate china closet in the dining room because china is stored in cabinets hidden behind wall panels.

The hardwood flooring is laid in a herringbone pattern - another wonderful detail. A gas fireplace has a custom marble mantel, giving it a contemporary look which perfectly balances the formality of the crystal chandelier overhead.

If visitors are lucky enough to stay overnight, they’ll find rest and comfort once they pull down the guest room’s queen-size Murphy bed. It’s flanked by bookcases and other storage.

Guests will also appreciate having their own full marble bathroom with soaking tub across the hall.

It’s the big, quiet master suite that completes this home and makes it a sumptuous retreat. The bedroom feels both cozy and contemporary - an excellent combination. Damask wallpaper from de Gournay duplicates the wall covering used at the Hotel Bristol in Paris. A king-size bed fits easily between the back windows, which have motorized blackout shades, allowing privacy and the ability to sleep in on weekends.

On the practical side, there are three walk-in closets so you have space for wardrobe, shoes, luggage and whatever else you need to put away.

The master bathroom is impeccable - a personal spa. It’s breathtaking with a custom double quartzite vanity, heated marble floor and tiles of a coordinating marble.

A deep soaking tub invites relaxation, but if you’d prefer, you can enjoy the big walk-in shower with a built-in bench. You’ll feel refreshed while standing under the showerhead and enjoying the luxury of a hand-held body spray. While you’re in there cleaning up, take the time to admire the single marble slab that comprises the control wall.

When laundry day arrives, you’ll be able to step into your convenient laundry room and load clothes into the full-size dark stainless steel LG washer and dryer. A Kohler sink allows hand washing of delicates and a quartz countertop provides space for folding.

This home boasts fabulous details, enviable views and ample storage. As McBride says, “It’s all very livable. There’s a place for everything. It’s cohesive. They thought through the whole space.”