This home, built in 1850, has a flat fašade with a distinctive four-bay oriel. Black sills and lintels frame the nine-over-nine windows with black shutters.

A fine South End townhouse at 161 West Brookline St. between Tremont Street and Warren Avenue reflects an architectural transition from bow front brick homes with high stoops toward the north and houses with shorter flights of stairs and flat facades toward the south.

This home, built in 1850, has a flat façade with a distinctive four-bay oriel. Black sills and lintels frame the nine-over-nine windows with black shutters.

Cast iron railings line the granite steps to a recessed columned entry with double doors with decorative ironwork and a colorful transom above. Adjacent to the stairs are steps that descend to an interesting garden with a water element and a separate entrance to the lower level of the home.

Greg Jackson and Calvin Arey of Coldwell Banker Residential Brokerage have listed this home at $2,599,000.

Officially a two-family home, it presently is used as a single-family residence and has great flexibility.

The space on the street level could be an in-law or au pair suite, a family room or another bedroom. The powder room and kitchen space could be expanded.

The home has a side hall plan and the marble-tiled foyer behind the double doors features a gracefully curved staircase. Straight ahead is the kitchen, and on the right is a charming dining room with deep crown molding and recessed lighting.

This room flows into a contemporary kitchen with a curved granite-topped center island with a prep sink and a decorative fireplace with a tile surround. Custom cherry cabinetry lines one wall, and on the opposite wall is a white-painted hutch with a glass front.

High-end stainless steel appliances include a six-burner Viking gas range and hood, an Amana refrigerator and a Bosch dishwasher.

Some time ago the owners extended the kitchen to create a space for casual dining (beyond the breakfast seating at the island) and added an outdoor deck. The new space has a built-in banquette that is curved, complementing the island, and the deck is furnished with gas, water and electric service, making it convenient for el fresco dining.

The second floor has two large rooms separated by a marble-tiled bath with a glass-enclosed shower and a vanity with an undermount sink. The front room is used as a living room and has a four-bay oriel with views of tree-lined West Brookline Street. One wall boasts built-in cupboards and open shelving for photographs, books and objects d’art. On the opposite side of the room is a large walk-in closet with a window.

The third level features two more bedrooms, each with good-sized closets. In between these rooms is another full bath with a pedestal sink and soaking tub. A row of glass blocks above the tub allows for more light to come into the room. The laundry with a stacked Bosch washer and dryer is behind louvered doors.

A skylight floods the carpeted stairs to the master suite on the top floor. At the top of the staircase is a pleasant dormered sitting area. Two large storage spaces with lighting are built into the eaves on either side.

The master bath is luxurious and boasts a radiant-heated floor. The glass-enclosed shower with a wide bench features long vertical tiles and a skylight. The bath also has a dual flush toilet and a dark stone vanity with swirls of green.

The bedroom has a skylight as well as three windows and a long window seat. Built-in bookcases and a wood-burning raised fireplace with a flush granite surround and hearth create a delightful penthouse retreat. A large closet with sliding doors has separate storage above them.

More living space is on the street level, which could be legally built out as an apartment. In addition to its private entrance, a staircase connects to the main floor. Outside this kitchen is a huge covered deck with gas, electric and water service. Steps lead down to a brick pathway where numerous plantings, including liriope and other perennials, flourish. A flowering dogwood with variegated leaves offers shade. Beyond the enclosed fence and wooden gate is a single deeded parking space.

The owners describe their home of 26 years as having “good bones and good vibes,” providing creative space for their socially responsible work.