Two beautiful duplex homes at 82 Worcester St. recently sold and a third is now under agreement.

When a classic 1900 brownstone in a conveniently located South End neighborhood meets a well-planned and executed 21st century down-to-the-studs renovation/remodel design, the results are destined to be spectacular.

Rob Kilgore of Coldwell Banker Residential Brokerage marketed these three duplex homes at 82 Worcester St. that certainly represent all that and more. And now two of those units have been sold and a third is under agreement.

Unit 1, a 2,055-square-foot duplex with three bedrooms and two-and-a-half baths, was on the market for $1,999,000. It is now under agreement with a closing expected as soon as March, according to Kilgore.

Unit 2, which sold on Jan. 25 for $1,757,500, has 1,765 square feet and includes three bedrooms and two-and-a-half baths.

Also off the market is Unit 3 – the penthouse, which sold on Jan. 19 for $1,925,000. That luxury top-floor condo has 2,030 square feet of space, three bedrooms and two-and-a-half baths.

Although each unit includes a fully open kitchen-dining-living room layout, these homes each have distinct personalities as well as attention-grabbing individual features.

The penthouse duplex, for example, has an extra wide living room that extends beyond the two-window bay. This part of the room that has a window overlooking Worcester Street could be office space or used for additional seating.

A huge walk-in closet in the master suite is just off the “second-floor” landing at the top of the staircase, saving space cleverly tucked behind the “first-floor” dining room wall. In fact, the stairs are so well hidden, be prepared for guests to ask where the bedrooms are located.

But the most distinctive feature in this home is found outside. Follow the full staircase through an easy-to-use bubble hatch (door) to a huge private roof deck. The new owners are going to love the 360-degree unobstructed views of the city, including the Back Bay and financial district. The availability of gas, water and electricity make this massive rooftop getaway entertainment central.

This home has a wonderful second private deck off the kitchen.

Unit Number 2 – with a parlor and above duplex home - is the smallest of the three homes, but that term is relative. The kitchen island is certainly immense and easily seats five. A full pantry closet is another bonus.

This home also has an appealing private outdoor space - a large deck that is directly off the kitchen.

With an enormous, private two-tiered paver patio area with gas, water and electricity that is also fully fenced, Unit Number 1 is the largest of the three homes. The first floor and garden-level duplex home also has a private front entrance with a vestibule large enough for a stroller or bike and a private back entrance.

In this home, the gigantic living room area is at the back of the unit with extra storage space (and a lot of it) off the kitchen. The kitchen also has a large skylight almost directly over the sink.

Another plus is that the master suite as well as the third bedroom, which can easily handle a full-size bed and is very workable as a nursery/kid’s room/office, is bigger than these same rooms in the other units.

However, what is most distinctive about these homes is not their differences, but what they have in common - an extraordinarily long list of exquisite details and luxurious finishes plus superb craftsmanship and state-of-the-art technology.

High ceilings, triple crown molding and five-inch white oak flooring pay homage to the building’s history while a Sonos-ready pre-wire system, central air conditioning and smart technology such as programmable Nest thermostats and on-demand water heaters, address contemporary desires.

Period-looking two-over-two Pella windows and natural gas fireplaces - all in the living rooms - are comfortable (no pun intended) in both worlds.

All fixtures and hardware throughout reflect modern sensibilities. Wolf appliances including a five-burner gas cooktop, microwave and wine fridge, an Asko dishwasher and a Sub-Zero refrigerator with a two-drawer freezer and integrated panel are installed in each home. White Carrera marble backsplashes and honed Jet Mist granite countertops (including the over-sized center island) complement Chef Pro Artisan stainless steel sinks with Grohe faucets.

Custom white wood cabinets (Unit 2 has Shaker-style cabinets while the cabinetry in Units 1 and 3 are designed with flat square edge perimeters) have LED under-cabinet lighting. Enormous center islands with honed marble counters (Montclair “Danby”) double as excellent work/prep space. The islands comfortably have room to seat several people.

Two kitchens (Units 2 and 3) offer casual eat-in areas in a sunny bump out. In Unit 1, this is additional space for the living room since the floor layout is reversed with the kitchen area facing Worcester Street.

The powder room in each unit has a Kohler commode and a white Elite Elanti sink with a Kohler Toobi chrome faucet. Custom cabinets are also in these rooms along with tile floors and beautifully accented walls.

Radiant heated tile floors are only one of many impressive details in the master en suite bathrooms. Carrera marble herringbone patterned flooring, Grohe fixtures (including a rain shower spray in the step-in shower) and recessed Robern medicine cabinets - the full glass doors roll up - are on the list, too.

Each unit also has a variation of a Jack ’n’ Jill bathroom with a Mirabelle Edentun tub/shower combination with a tile surround and Kohler commodes. Full-size Electrolux washers and dryers are installed in laundry closets.

And speaking of closets, the new owners are going to love the storage space. Every closet is large, especially those in the master suite. These are huge customized walk-in affairs.

These urban residences also have deeded parking behind the building.