While a condo may be a modern dwelling, Unit 1 is a classic traditional dwelling with many original details, according to broker Allison Mazer of Gibson Sotheby's.

Beautiful traditional brownstone buildings line Commonwealth Avenue in the Back Bay section of Boston and one located at 68 Commonwealth Ave. was converted into four condominiums.

While a condo may be a modern dwelling, Unit 1 is a classic traditional dwelling with many original details, according to broker Allison Mazer of Gibson Sotheby’s, but also has the potential to be whatever the new home owner envisions.

According to Mazer, the home is accessible from Commonwealth Avenue, but also from a deeded parking space.

The foyer speaks to the sophistication of the building with custom carved woodwork on the outer doors, sconce and chandelier lighting and a white and black patterned marble floor.

Choose from one of three doorways to enter the first floor of the unit depending on the plans for the day or evening.

“(The unit) is under 3,000 square feet, but it feels much large,” Mazer said.

On first floor is a grand living room with 12-foot ceilings and large windows overlooking the Commonwealth Greenway.

Preserved hardwood floors run the length of the unit front to back and a beautiful arched doorway separating the living room from a formal dining room contains a pocket door original to the rooms.

Attention to detail is evidenced by the gold leaf trim on the ceiling moldings and the lovely wainscoting gracing the living room walls.

Another touch of charm and beauty to the room comes from an elegant marble fireplace with intricate details on the wooden mantle.

The formal dining room has all that is needed for entertaining, including a built-in china cabinet with multiple shelves and cabinets to showcase dishes as well as store them.

Off of this dining room is a kitchenette, complete with a double burner Gaggeneau cook top, an oven and a microwave for keeping things warm or cooking for one’s guests.

Beyond the dining room behind privacy doors is the expansive master bedroom with a second marble fireplace, a sitting area and a recently renovated private bathroom.

The bathroom now includes a soaking tub, glass-door shower, a long double vanity and speakers wired for sound

The high ceilings, wainscoting and almost floor-to-ceiling windows give added dimension and depth to the already large 15 by 22-foot room that is as large as the living room.

“It’s so grand, the details are outrageous,” Mazer said. “People have talked about turning the master into another less formal dining area with the kitchenette so all the living is on one level.”

Heading downstairs is like going into a different home altogether with lovely terra cotta flooring and a third fireplace with imported tiles surrounding it in the living room.

The room has built-in shelving for books, a large flat screen TV, or other items for display as well as lots of cabinet storage.

“The two floors feel very different,” Mazer said. “Upstairs is very formal and grand with the ceiling heights while downstairs is cozier.”

Off of this living room is a lovely private brick-walled patio area with two separate access doors, large enough for a table and chairs and a grill for three seasons of eating outside.

“Being on the ground floor, you want the light and outdoor space which you have here,” Mazer said.

A full contemporary chef’s kitchen, recently redone in the last few years according to Mazer, with Thermadore and Subzero appliances, granite counter tops, a wine rack built in next to the refrigerator and a five-burner gas cook top, makes cooking a breeze while the many cabinets and drawers give ample room for storage.

This level has two bedrooms and an office that could potentially be turned into a smaller third bedroom.

Each bedroom has its own private full bathroom while a third half bathroom is located in the hallway on this floor.

The office has two closets with shelving and built-in bookcases, so use as an office means plenty of room for tools and supplies while if it were turned into another bedroom, there would be room for clothing, shoes and storage.

“It’s large enough for an empty nester who wants an in-city property, but wants the extra bedrooms and storage space when people visit,” Mazer said. “It lives like a home. There’s a lot of square footage.”

Calling the building “exceptionally maintained,” Mazer said a lot of work has been done, including preserving and protecting the brickwork.

She said the home is also perfect for someone with a vision who wants to recreate the unit into how they want it to function.

“You have a lot of options with the floor plan and how you want to live in the unit,” Mazer said. “It’s a pretty special property for someone who (appreciates) the details and wants some of the charm of Back Bay.”