One New Yorker is proving the city’s past is just a business card away.

After stumbling upon a dusty Rolodex at an Upper East Side estate sale, Mari Huang, 31, has turned a stranger’s curated collection of business cards into a heartwarming nostalgia rabbit hole — tracking down old-school NYC shops, performers and neighborhood gems that somehow survived decades of change.

The Crown Heights resident’s step back in time began with a $5 impulse buy at an estate sale in an old apartment building near Central Park in January 2025, just months after she moved to the city from Ohio.

Since spotting the hidden gem, Huang has documented her visits to these old-school businesses, the ones still around, in her viral “Rolodex Recs” TikTok series that has since become a love letter to the New York many longtime residents thought was gone forever.

“I’ve had so much fun since I discovered the Rolodex and I’m a really nostalgic person,” Huang told The Post.

“Physical media matters so much to me, and I loved finding a tangible list of places to discover that were loved by a longtime New Yorker.”

The business card holder — which she later learned isn’t technically a Rolodex at all — belonged to an Upper East Side woman affectionately known as “Peach,” who died in 2024 at 79 after a life filled with art, museums, travel, volunteering and, apparently, impeccable taste.

“I saw the Rolodex sitting there among this woman’s really cool and eclectic things in the apartment and knew I had to bring it home,” adding that she could tell the woman had “such a chic signature style based on her clothing, artwork and trinkets” that were all for sale.

Upon examining the holder a little closer, Huang, who works in social media management, quickly realized she wasn’t just buying an organizer — she was inheriting someone else’s New York.

“I wanted to make a series centered around New York and I wanted to go to the places found in the Rolodex that this woman went to,” Huang explained.

Since snagging the organizer, the 31-year-old has been methodically sorting the cards into two piles: the businesses that are still standing and those that have disappeared beneath soaring rents, luxury developments and changing neighborhoods.

The result is part scavenger hunt, part time capsule.

Among Huang’s favorite discoveries is Tiny Doll House on the Upper East Side, a whimsical miniature shop that’s quietly remained in business for more than three decades.

“…It’s such a special, unique and cool store that sells miniatures for dollhouses,” she said.

She was equally thrilled to find East Village vintage eyewear shop Fabulous Fanny’s still serving stylish New Yorkers after more than 30 years.

The Brooklynite told the story of the estate sale Rolodex to one of the store employees and said the two bonded over their love of fashion.

“I love how the Rolodex helps me meet such interesting and stylish people and it’s brought so many fun experiences into my life,” Huang told The Post.

Other cards led her to century-old bakeries like the UES staple Orwashers, while some represented places that no longer exist (like the shuttered Midtown shop Cellini Shoes and Bags) — bittersweet reminders of the city Gothamites have watched slowly disappear.

Thanks to Peach, Huang also discovered longtime Carnegie Hill cookbook shop Kitchen Arts & Letters, the Italian-inspired espresso and wine bar La Bomboniera, and beloved independent bookseller The Corner Bookstore just steps away.

But it isn’t just the businesses that fascinate Huang.

Mixed between storefronts are business cards for Broadway actresses, opera singers, artists, vintage jewelry experts and even a classical harpist — clues to the colorful social circle Peach cultivated over decades.

Inside, Huang also found a foldable Central Park map, a 2006 subway map, Paris business cards, a 1987 crystal guide, church keepsakes, obituary cards and one especially touching surprise.

“Something I also found within the Rolodex is a handwritten list of things she was thankful for that she wrote out, and I think that’s so sweet,” the millennial explained.

“She wrote things like ‘air to breathe, water to drink and swim in, money I have to give, family and sex,’ and I’m like, ‘okay queen, you go girl,'” Huang said with a laugh.

The more Huang explored, the more she felt she’d stumbled into the life story of someone she somehow already understood.

“Obviously, I didn’t meet her, but I do feel connected to her,” Huang said. “I feel like Peach and I are kindred spirits because she also kept lists, keepsakes and mementos that mattered to her in a detailed, organized and meticulous way.”

Huang loves to “junk journal,” or add receipts, concert stubs, movie tickets and more little things into a journal, which she says helps tangibly document her life and memories.

That connection has resonated with viewers, too.

Older Big Apple residents have flooded the comments of Huang’s videos reminiscing about long-lost businesses and neighborhoods, while younger viewers describe the videos as feeling like a “time travel” to an era before chain stores and algorithms dictated where people shopped, ate and explored.

“This is making me emotional…this was someone’s life. You are in their footsteps… I’m gonna cry,” one viewer of Huang’s viral videos wrote.

“What a wonderful way to commemorate someone you never even knew,” another added.

An additional fan commented, “Oh my gosh, I’ve been to all these spots. It feels so special to know someone else loved them as much as I do.”

For Huang, the project has become more than a viral series.

It’s a reminder that the city’s soul often lives in the places that quietly refuse to disappear.

“I love having a physical, cool, curated list of places to check out instead of feeling the need to resort to the internet or social media posts,” she said.

“I’m lucky to have a list from a different era, and I love seeing which places are still here today thanks to the woman who left it behind.”

The experience has also changed the way she thinks about memory itself.

“She left something special behind that a stranger was able to discover, and it made me think more about what I’d like to leave behind someday. No one is going to discover my digital Google Maps lists of places I love when I’m gone,” Huang said.

As her videos rack up views, Huang says she’s still working her way through Peach’s carefully collected stack of cards — one forgotten storefront at a time.

Huang says she plans to keep mining the Rolodex for forgotten NYC gems. While the first two installments of the series were filmed with the help of Shortform Series, she now creates the videos alongside her sister — a partnership she plans to continue.

“I think the response from viewers has been so cool. I’m so excited that people are as excited as I am and want to follow along my journey with the Rolodex,” she said.

“Other New Yorkers are now invested in this series and want to discover more new places that Peach had saved and noted.”

“It’s really encouraged me to keep looking through it and planning more places to visit. I’m grateful she is guiding me through the city.”