A full-page newspaper ad announces the grand opening of Stern's Great Neck, which replaced the 4-year-old John Wanamaker Great Neck store in September 1955.
Advert from the Allied Stores Corporation 

The Long Island Railroad's Great Neck Station was -and is- located across South Middle Neck Road from the shopping hub.
Photo from Wikipedia / Adam Moss 

The SHOPPING MART was in decline by the mid-1980s. It was renovated and re-tenanted in the mid-1990s and renamed THE GARDENS AT GREAT NECK PLAZA. The snapshot above -and the two that follow- show the shopping hub in the early 2000s. 

Photo from Nassau County, New York

Moving toward the center of the center, we see the previous John Wanamaker Great Neck store. It housed the Waldbaum's supermarket seen here for over 14 years. 

Photo from http//www.showcase.com

In this snapshot, we see the West Wing of the PLAZA. A Rite Aid pharmacy appears on the right. Over the years, this space has housed a Grand Union grocery and Pathmark Drugs.

Photo from Nassau County, New York

Since the 1990s renovation, the official name of the shopping strip has morphed from THE GARDENS AT GREAT NECK PLAZA to simply THE GARDENS AT GREAT NECK. At the time of a circa-2020 site plan, the center anchor space is occupied by a Best Market grocery store. There were seventeen tenant spaces and free parking for 500 autos.

THE GARDENS AT GREAT NECK TENANTS 2020:

Astoria Federal Savings & Loan / Best Market / Chase Bank (outparcel) / Chipotle Mexican Grill / Dream Wellness-Dreamnastics / European Wax Center / Fine Wines & Liquors / GoHealth Urgent Care / Great Neck Library Station Branch (Second Floor) / Matsuya Japanese Restaurant / MCS Mortgage Bankers (Second Floor) / Planet Fitness (basement) / Rite Aid Drugs / Starbucks Coffee / Sterling National Bank / Sunny Nail Spa / TD Bank / Voro Real Estate (Second Floor) / Wells Fargo Bank / Wild Ginger restaurant