Mystery solved: The former Subway sandwich shop at 137 Hudson (between Hubert and Beach) will be the first “concept store” for Elphia Beauty, according to a press release. “Elphia Beauty is a vegan-friendly and cruelty-free skin care company with a strong dedication to the science behind how skin care product ingredients work both independently and once combined. […] Elphia Beauty will be launching the concept store with its two signature products: the Luxe Exfoliating Gel and the Luxe Rejuvenation Serum. The Luxe Exfoliating Gel is a vegan friendly face and décolletage refining gel. Think of it as an easy-to-use at-home spa treatment, targeting your dead skin cells. It instantly exfoliates and brightens for enhanced skin renewal, comparable to a professional salon peel. […] The Luxe Rejuvenation Serum is a pure, naturally derived formula that works to provide hydration through the layers of your skin, functioning to renew your skin’s texture and provide a spa-like radiance.” The store opens Monday. And judging from the photo below, the company would seem to have discovered Interlude Coffee & Tea up the block.