The bonus is that this jewel box of a residence in The Penmark, which is the former Boston College High School, has a sophisticated ambiance and is filled with fine modern finishes and thoroughly up-to-date features.

Living in a building with an impressive Boston pedigree on a prettily tree-lined street in the South End, complete with a brick paver sidewalk, may be enticing, but the real issue is whether what’s inside is as impressive as the exterior. As the home in question is thoroughly modern and beautifully renovated, the answer is an unequivocal – yes.

The bonus is that this jewel box of a residence in The Penmark, which is the former Boston College High School, has a sophisticated ambiance and is filled with fine modern finishes and thoroughly up-to-date features.

Anthony Conti of Sprogis & Neale Real Estate has listed Unit 205 at 21 Father Francis Gilday St. for $1,249,000. This home has 1,144 square feet of space with two bedrooms and two full baths.

A generously-sized foyer is the gateway to this chic home. The well-planned layout that maintains personal privacy plus an open concept floor plan is equally suitable for entertaining and for daily living.

High ceilings – we’re talking almost 10-feet high everywhere – add drama and showcase stunning four-over-four windows in each room that are almost floor-to-ceiling. It is all the better to enjoy views of Back Bay and the historic burying grounds.

Sleek modern black frames within classic window casings evoke a timeless vibe that enhances eco-friendly bamboo flooring throughout the entire home. The result is a flexible backdrop that works for various decors: modern, traditional or eclectic.

The fully (and newly) gut-renovated kitchen is more than just big; it’s beautiful. Stainless steel appliances that include a Bosch gas stove, oven and dishwasher and a JennAir French-door refrigerator with the freezer on the bottom are hardworking as well as good-looking tools for budding and master chefs. Stunning custom cabinetry with glass and closed front cupboards with under-mount lighting are a double treat: functional and easy on the eyes.

The glass tile backsplash in a herringbone pattern is a striking complement for white Caesarstone countertops installed in a waterfall effect on the peninsula. The multi-functional peninsula also has a stainless steel under-mount sink and seating for two people.

The open concept living-dining area is not only large, but also well-proportioned - making furniture arrangement easy. The dining area, for example, can be set up for intimate tête-à-têtes, formal repasts for six or eight people, cocktail parties or larger casual (or not) gatherings while still maintaining sufficient seating/conversation areas in the living room.

The huge window in the master suite sleeping chamber is an immediate focal point, but this room has more bragging rights than that. In addition to handling a king-size bed, this space has all kinds of room for a chest/bureau, etc., and could easily accommodate a comfy chair.

The lighted walk-in closet is big and deep with custom inserts (open shelving and specialized hanging spaces) while an adjacent smaller closet is handy for shoes, sweaters and such.

The en suite bathroom has a huge step-in shower with a frameless glass enclosure. Built-in corner shelves hold bathing necessities. Ceramic tile flooring matches the tile surround, creating a seamless and serene look.

Like every room in this home, the guest chamber is quite sizable with an extra wide, lighted double closet with custom inserts. A mini bump out adds character and architectural dimension. The bonus is an abundance of natural light via all those great windows that makes having this room do double duty as an office a viable option.

A contemporary bathroom directly across the hall has a tub/shower ensemble. In-unit laundry facilities include a full-size stackable, Frigidaire washer and dryer in their own dedicated space with sufficient room for laundry supplies.

Speaking of storage, two roomy closets – one bigger than the other – just off the foyer can be used for coats and/or a pantry.

The building has its own share of perks that make it user friendly, such as an elevator and additional storage space on the lower level. The Penmark’s fitness center, garage parking and 24/7 concierge services are also part of the deal.