Located on the third and fourth floors at 54 Commonwealth Ave., this is a classically styled building that looks 19th century, but was built in the 1980s

Commonwealth Avenue has countless memorable residences and this unique two-level home is one of its most outstanding examples.

Located on the third and fourth floors at 54 Commonwealth Ave., this is a classically styled building that looks 19th century, but was built in the 1980s. This home that lives like a single-family is two floors combined into one unit with direct elevator access. Three parking spots - two in a garage and one outside - are also included.

Annette Given and Mackenzie Harpine of The Charles Realty have listed this Back Bay 3,919-square-foot home with four bedrooms, three full bathrooms and one half bathroom for $5,775,000.

Direct entry from the elevator opens into a long and wide “gallery” foyer that characterizes the aesthetic of this sophisticated residence. A colorful mosaic wall fountain purchased in Morocco is an immediate conversation starter while a gently barrel arched ceiling invokes intimacy. Mottled grey-and-white marble tile trimmed in black is an elegant canvas for the entire unit (there are two sensational exceptions) and leads to living spaces at each end of the gallery.

In the massive and fully open living-dining room, the wood-burning fireplace with a custom mantel by Boston Ornament Company, Inc. is a striking visual feature that reflects the contemporary styling of this home. A coffered-ceiling effect (complete with recessed ceiling lights) at each end of this large space creates individual “rooms” - albeit ones without walls - that makes the entire space user friendly.

Each end has a single eight-over-eight, double-hung window “flanking” an extra-wide three-window bay overlooking the Mall.

Custom storage units with open cubbies (again on each side of the room) have fabric screens. Some are doors; others are sliders. The result is instant decorative displays that can change with minimal effort. The wood niche for the fireplace is behind one screen, for example, and others have books, art work and/or the odds ’n’ ends that tend to accumulate in every home. Neutral colors enhance the serene ambiance of the room.

One storage section adjacent to the dining room, which seats eight easily, serves as a modern version of a traditional china closet. This elegant space has pocket doors both to and from the living room and the kitchen.

Like the rest of this home, the galley kitchen is stylish with a touch of glamour, yet efficient and worthy of a master chef. Under-cabinet lighting and the lacquer finish on an abundance of white cabinetry sparkle in the mirrored backsplash.

The cabinets are more than pretty, however. Along with a pantry closet, this kitchen has a pullout spice rack and a pull-up appliance shelf that becomes counter height plus a second round stainless steel sink.

The appliance package that includes a Sub-Zero refrigerator, Kitchen Aid trash compactor, a four-burner (with grill) gas stove and a dishwasher with an integrated front panel are additional chef’s tools. This well-planned and large space (it’s an extra wide galley) even has built-in eat-in/desk space under a window with custom chairs that match the cabinets.

Full-on glamour rules in a nearby powder room that has an oval nickel sink with nickel faucets. The granite countertop complements everything.

An enormous room at the other end of the gallery, filled with beautiful details and extras, is ready for just about anything. French doors open to the room with cork tile flooring that is the width of the unit; two more sets of French doors opening to Juliet balconies are on either side of large double-hung windows.

A full wall of built-in storage and huge closets plus a wet bar with all the essentials: cabinet space, a square ceramic sink, U-line wine cooler, compact refrigerator and an ice maker, increase the versatility of this room.

Essentially a clean slate, this room could be a stunning first-floor master suite, family room, guest quarters, studio (art, yoga, etc.) or an incredible home office. Combining one or two of these uses is another option.

Whether taking the stairs or the elevator to the second floor bedrooms (extremely handy when returning from a trip) the destination is well worth the journey. Although the layout with long galleries (on each side of the elevator) leading to living spaces at each end is similar to the floor below, the second level has a distinct personality.

The guest wing (at the back of the home) includes two rooms. One is master-bedroom-big with an extra-wide lighted double closet along with its own linen closet. A jetted tub/shower combination in the en suite bathroom has multiple body sprays, a marble surround and glass doors.

Plantation shutters give the other spacious room an oasis-like feeling. A great bedroom has two closets, both of which are lighted. This also works well as a study, a sunroom (it faces south) and/or an office.

The shared bathroom features a five-foot-long (at least) walk-in marble shower with multiple body sprays. A marble banjo-shaped countertop maximizes the use of space.

The master suite, however, is an oasis of serenity and beauty. Cherry flooring begins at pocket doors that open to an “outer” space with a meditative ambiance. A custom wall of rectangular niches of different sizes (each is internally lit) with drawers below and a bookcase at one end is, on its own, a piece of installation art. When collectibles are added to each section, the entire wall becomes an art gallery.

Surrounded by works of art, this space is ideally suited for contemplation or slightly more active relaxation such as yoga.

Multi-pane French doors open to the sleeping chamber, which although even larger, has the same retreat-like feeling. A large bay window area has an exceptional view of Commonwealth Avenue and the mall.

Two pocket doors open to a dressing room/closet built for two. This room-size walk-in wardrobe offers all the essentials and then some: floor-to-ceiling drawers (in graduated sizes) and cabinets, specialized hanging spaces, shoe storage and a floor-to-ceiling three-section mirror.

An adjacent laundry room is fully equipped with an Electrolux washer and dryer (full-size) plus a stainless steel sink and storage cabinets. While a fold-down ironing board is a thoughtful convenience, luxury is not overlooked. The floor tile is marble.

A radiant heated floor is only one luxurious detail in the en suite marble bathroom. The jetted tub/commode room, for example, has custom remote controlled shades that allow in natural light while providing a complete privacy. A step-in steam shower is fully tiled and the vanity has two sinks. The dressing table is an extra treat.

One more detail: pets are permitted per an amendment to the condo docs.