Which retailer holds the Guinness World Record for the largest individual store by retail floor space?

The retail industry is known for breaking boundaries, and some stores have literally done this by claiming world records for their massive size. From shopping malls to department stores, retailers around the globe compete to create the most impressive shopping destinations. This trivia question tests your knowledge about which retailer holds the impressive world record for the largest individual store (not a mall) by retail floor space.

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Macy's Herald Square (New York City)
Shinsegae Centum City Department Store (Busan, South Korea)
IKEA (Gwangmyeong, South Korea)
Selfridges (London, UK)