This condominium with three bedrooms and three-and-a-half bathrooms is a corner unit that spans the east side of the 14-story brick, limestone and glass building and encompasses 3,519 square feet of living space. Tracy Campion of Campion and Company Fine Real Estate has listed this gem at $12,500,000.

If you were allowed to choose only one adjective to describe E-9A, a spacious home at the Residences at the Mandarin Oriental in the Back Bay, it would have to be elegant. And even that does not fully evoke the sense of well-being presented here.

This condominium with three bedrooms and three-and-a-half bathrooms is a corner unit that spans the east side of the 14-story brick, limestone and glass building and encompasses 3,519 square feet of living space. Tracy Campion of Campion and Company Fine Real Estate has listed this gem for $12,500,000.

Its entrance at 776 Boylston St. is separate from the hotel entry and is staffed by a doorman and a concierge.

A keyed elevator will transport you to the ninth floor and hallway to this unit. Tall, highly lacquered double doors open into a vestibule that flows into a magnificent foyer that features a nine-foot-high cove ceiling with crown molding accented with gold trim and a stone floor - all a harbinger of the understated luxury that lies within.

A turn to the left, past a columned doorway, leads into an expansive, light-filled living room with dark-stained hardwood flooring laid in a herringbone pattern.

The floor-to-ceiling corner windows overlook Boylston Street and Ring Road with views of the Back Bay and beyond to Downtown.

Wide doorways on either side of a double-sided gas fireplace with a custom mantelpiece access the large dining room. Like the pair of windows in the living room looking out to Boylston Street, the dining room windows open to Juliet balconies.

Both rooms include the cove ceilings with the gold-accented crown molding. William Hodgins, an internationally known interior designer, designed these spaces, according to Campion.

Adjacent to the dining room is an extraordinary eat-in kitchen, filled with especially designed high-gloss, deep red Poggenpohl cabinetry and furnished with top-of-the-line appliances – a Sub-Zero integrated refrigerator, a Thermador Professional six-burner gas range with a griddle, a stainless steel wall microwave and Fisher & Paykel dish drawers. Recessed lighting and under-cabinet task lighting brighten the room, and the white stone counters and bleached ash flooring contrast nicely with the bold red cabinets.

Double doors in the dining room can close off the kitchen, and a second door from the reception hall to the kitchen can keep family and guests separate from a caterer’s busy activities.

Another set of double doors in the foyer opens into a charming library with wall-to-wall plush carpeting and a cove ceiling. Floor-to-ceiling shelves to hold books, photographs or art objects line the walls here, interrupted only by pocket doors from the living room or another set of French double doors to the private quarters. Behind these doors is a spacious en suite master bedroom, fully carpeted, with built-in dressers.

Two mirrored doors open into a closet and into a sumptuous master bath that includes a large white stone vanity with a single sink, a deep soaking tub set into a tiled deck beneath a window and an adjacent glass-enclosed shower with a rain forest shower head. A water closet encloses the toilet and bidet, and the flooring features a basket weave design.

Beyond this bath are two good-sized walk-in closets; one has access to the reception hall, but is not used; the second extends into a hallway that leads to the two other bedrooms that also are carpeted. Each has an en suite bath with a single vanity and glass-enclosed shower. One of the baths has corner windows.

Off the hallway that returns to the foyer are a storage closet, a laundry room with a side-by-side Maytag washer and dryer and a pretty powder room painted with a lovely pastoral scene.

Valet service and self-parking are available for the home’s two underground heated parking spaces, and the amenities that accompany this property simply add a level of serenity and comfort for the residents.

The mixed-use complex includes a Forbes Five-Star spa (the only one in Massachusetts), a state-of-the-art fitness center and a famed Bar Boulud. White glove services also include in-residence dining from the bar and the hotel itself. Indeed, Residences at the Mandarin Oriental epitomize fine urban living.