The windows – more than 25 of them – are one outstanding feature. Sleek and chic, these black metal beauties include multi-pane glass sliders and several double hung 12-over-12 windows, many of which are almost floor-to-ceiling.

“Extras” such as garage parking, an elevator building and a gigantic private roof deck with views that go on for days are enough to create immediate excitement about Unit 8 at 350 West Broadway in South Boston.

But the real treasures are inside this applause-worthy, two-bedroom penthouse duplex with 2,360 square feet of living space, listed by Samantha Jason Lehman of William Raveis Real Estate for $2,099,000.

The windows – more than 25 of them – are one outstanding feature. Sleek and chic, these black metal beauties include multi-pane glass sliders and several double hung 12-over-12 windows, many of which are almost floor-to-ceiling. Nine-foot-high ceilings (on both levels) and customized California Closets are standard as is hardwood flooring with custom baseboards and Hansgrohe faucets in the three full bathrooms.

Some of the conveniences include Nest-controlled dual-zone heat and central air, Navien on-demand tankless hot water and four-zone Sonos surround sound.

Fine furnishings and finishes - such as chandeliers, draperies, wall sconces and mirrors - enhance the innate elegance of this home. In fact, buying this unit furnished is an option.

But the devil is in the details and the details are spectacular. The spacious front foyer is the gateway to this sophisticated one-owner home designed by Brian Watford Interiors of Atlanta.

The main level features a huge office/den plus a sizable sitting area where a stunning gas fireplace, flanked by custom built-in book/display cases, is an instant focal point. Two double closets provide an abundance of storage – and that’s in addition to common basement storage. Using this as a guest space and/or another bedroom is very doable.

A full bathroom that has a tub/shower ensemble with a subway tile surround is directly across from a second spacious bedroom with two windows flanking fabulous French doors to a Juliet balcony. An oversized double closet is a bonus in this light-filled space.

The master suite, however, is amazing. Massive – yes. It’s the width of the unit. And stunning, too, with a wall of windows overlooking Broadway, a sitting “room” area and more than ample space left for a king-size bed and any desired bedroom furniture. The walk-in closet is 16 feet long and has a window in addition to all kinds of custom inserts.

Luxurious and spa-like, the en suite bathroom has a radiant heated tile floor and dual Hansgrohe rain shower heads in the oversized, glass-enclosed walk-in steam shower. Two sinks in the extra-long vanity are more than elbow-room apart.

For added convenience, this level has a huge laundry room with full-size Electrolux machines and two more double closets.

A custom wrought iron railing in the stairwell to the upper level is a subtle, but striking clue that what’s ahead is memorable. And it is.

The completely open living room - dining room - kitchen area is enveloped by three walls of windows. Natural light floods this gigantic space that is anchored by the spacious L-shaped kitchen. This gourmet chef-worthy cookery with Wolf, Sub-Zero and Bosch stainless steel appliances, a Danby wine cooler and quartz countertops offers more than just form. Beauty is integrated into every aspect from custom J&K cabinetry and a Blanco kitchen faucet to the Javier blown glass pendant over the center island with a stainless steel sink. The island also seats four people comfortably.

A full bathroom on this level with a pocket door and walk-in marble shower is admittedly a bonus (both in convenience and in looks), but for sheer drama, the award goes to the 400-square-foot walkout Trex roof deck. With sweeping skyline views from One Dalton in Back Bay to the Seaport, this outdoor oasis is a yard in the sky - complete with a direct gas line for a grill and a custom wrought iron railing. Exterior lighting – Restoration Hardware Union Filament sconces – allows for nighttime enjoyment, too.

Extra amenities besides outdoor space and garage parking include a well-maintained and professionally managed sprinkler building and the advantages that come with this sensational location. D Street (and access to the Seaport) is right around the corner while Foodies and eateries such as Nero, Lincoln Tavern, Capo and Loco Taqueria are two blocks away or less. The Broadway T-Station is four-and-a-half blocks away and the bus stop is right outside the door.

For more information and to get a virtual tour, visit 350WestBroadway.com.