When you own a brilliant collection of blue-chip contemporary art, assembled slowly and deliberately with your heart as well as with your head (the elusive true collector), it can be difficult to create a setting with the aesthetic brio to match.

Alex Papachristidis
Richard Powers

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A pair of 1960s chairs from John Salibello is in a , the custom sofas are covered in , and the Karl Springer cocktail table (foreground) is from ; the 1960s stainless steel chairs and cube are by Maria Pergay, the table lamps are by , and the curtains are of a silk-cotton blend; the artworks on the wall are by (from left) Richard Prince, Rudolf Stingel, George Condo, and Elizabeth Peyton.

But this native Manhattanite in her 50s did not have to look far to find a simpatico partner: Interior designer extraordinaire Alex Papachristidis has been a family friend since childhood. They both grew up in (perhaps unsurprisingly) art-filled households on the Upper East Side during the late 1970s. In fact, it was she who, during college, told Papachristidis that he should become a decorator. “It was so obvious to me,” she says, decades later. “And now, the really beautiful thing is that everything has come full circle.”

Alex Papachristidis
Richard Powers

On the opposite end of the living room, paintings by Richard Prince (left) and John Currin hang on either side of the door to the library. The custom glazed-ceramic Eve Kaplan console is from , and the vintage Jacques Quinet games table and chairs, in an , are from .

The home that Papachristidis radically transformed for her is imbued with significance for them both: She has lived there since her 20s, the last 10 years or so with her second husband, and the gracious building is just blocks from where, as teenagers, she and the nascent designer snuck into such hot spots as Dorrian’s Red Hand and gossiped over hamburgers at Jackson Hole, still an important hangout for private-schoolers.

 Alex Papachristidis
Richard Powers
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In the dining room, the custom tables are by , the vintage Peter Hvidt chairs are in a linen-cotton blend, and the silver leaf–and–rock crystal chandelier is from ; the curtains are of a fabric with trim, and the walls are painted in ’s Cumulus Cloud. A pair of Jeff Koons Puppy vases rests on the custom mantel below an Anish Kapoor Purple Mirror wall sculpture; the fireplace is framed by Rudolf Stingel artworks.

Swathed in shades of white, with sculptural furniture by some of the most rarefied design talents of the 20th century—and embellished with strong gold and silver touches that catch the light flooding through picture windows—the apartment is a dazzling locus for the couple’s art collection.

alex papachristidis
Richard Powers

The dining room’s vintage Lucien Rollin buffet is from ; the wall artwork is by Rudolf Stingel, the sculpture is by Maurizio Cattelan, and the framed painting is by George Condo.

They own several major works each by Rudolf Stingel, Elizabeth Peyton, George Condo, and John Currin, which they have amassed throughout the artists’ careers. But despite the two-year process it took to create the glamorous dwelling, the experience for the homeowner was one of joy. “Doing a project like this with your best friend,” she says, “makes your life richer on every level.”

alex papachristidis
Richard Powers

In the entrance hall, the consoles are by , and the custom plaster lanterns are by ; the artworks include two paintings by Christopher Wool and a sculpture by Mark Grotjahn.

Her husband found the process just as pleasurable. As a young man, he had bought midcentury furniture by Prouvé and Perriand but had grown disenchanted with how ubiquitous their work had become. “I’d seen enough of that,” he says. Redoing the apartment gave him a chance to explore rare works by monumental figures including Maria Pergay and Gabriella Crespi.

alex papachristidis
Richard Powers
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A pair of circa-1960 aluminum John Vesey folding benches from flanks the entry into the master wing; the paintings are by Elizabeth Peyton, and the bird sculptures are by Maurizio Cattelan; the walls are painted in ’s Super White.

In fact, it was a Crespi Z desk, which now commands a corner of the library, that set the tone for the entire project. Once they found it, ideas began to flow. The apartment had the requisite classical bones, but the couple wanted a clean, more modern environment. The wife loved the haute-1980s way Mark Hampton had decorated it (during her first marriage) and appreciated the freshening Papachristidis had provided 10 years ago, but it was time for an entirely new era. “Everyone was surprised, because I am such a creature of habit,” she says, “but once we decided, I found myself going even further than Alex wanted.” Among the only things they kept from the previous decor was a small table by Diego Giacometti. (Really, who could blame them?)

alex papachristidis
Richard Powers

The kitchen’s custom island is topped with brushed stainless steel, the range is by , the Saarinen table and chairs are from , and the Dandelion chandeliers by Tony Duquette are from ; the Roman shade is of a China Seas fabric with velvet trim from , and the floor tiles are by .

Papachristidis fashioned geometric moldings and mantels inspired by the designs of the 20th-century French modernist Jean-Michel Frank. He stained the original oak herringbone floors gray and had carpets made to suggest African motifs.

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Some decorators, faced with this caliber of an art collection, might have played the decor safe with demure sofas and chairs that don’t compete with what’s on the walls. Papachristidis took the opposite approach. He created contoured seating in the manner of Ward Bennett, the influential American midcentury furniture designer, and commissioned a pair of Andrea Koeppel lamps in gilded ceramic and parchment trefoil that hold their own in the space, even with a striking Condo canvas hanging nearby. The front door is flanked by trompe l’oeil consoles in white, gray, and black opaline glass by Roberto Giulio Rida; the couple found them in an antiques shop in the Carlyle hotel, where they stayed while their home was under construction. “We just knew they would really set the tone,” the wife says.

alex papachristidis
Richard Powers

In the library, the vintage Ward Bennett swivel chair in a cotton-silk blend is from , the circa-1960 Italian lounge chair in a linen is from , and the custom sofa is in a fabric; the marble-and-brass cocktail table is by, the Claude Lalanne bronze chair is from , and the custom carpet is from A sculpture by Maurizio Cattelan hangs over the custom mantel, which holds artworks by Elizabeth Peyton.

Papachristidis, who himself lives in a color-saturated, maximalist apartment nearby and spends weekends in Bridgehampton, also pushed his clients to temper the rooms with a few well-chosen traditional elements, including the dining room’s rock-crystal chandelier. “Bringing a touch of the Old World into the mix,” he notes, “creates a home that will never feel dated.”

alex papachristidis
Richard Powers
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The master bed is upholstered in a silk and dressed in linens; the stainless steel chair (right) is by Maria Pergay, and the Philippe Hiquily chair purchased at Sotheby’s has cushions in a fabric; the curtains are of a silk satin, the carpet is by , and the walls are sheathed in a Rubelli cotton velvet; the sculpture is by Rebecca Warren, and the painting to the left of the bed is by Richard Prince.

The couple may have come into the project with a rich knowledge of art, but working on their apartment with Papachristidis helped to broaden their horizons. On shopping trips to Europe, he introduced them to the whimsical and much-adored designs of François-Xavier Lalanne, whose animal sculptures they fell in love with. Such elements provide a bridge in their home between art and design, worlds with increasingly porous boundaries. “The best thing,” says the husband, “is that the thrill of this place hasn’t worn off one bit. Every day I walk through the door, sink into the Ward Bennett sofa, and pinch myself that I live here. I’m not the least bit jaded. I’m still in awe.” Indeed.

This story originally appeared in the December 2017 issue of Siweb.