Luxury home furnishings retailer RH is expanding further into Long Island, as the retailer looks to double its size internationally over the next five to seven years.

RH will have four stores operating on Long Island as of Saturday, when its newest gallery opens in the high-end Americana Manhasset shopping center. The 19,410-square-foot store occupies three levels at 2128 Northern Blvd. in Manhasset.

RH kicked off the Manhasset opening with a VIP reception Thursday night in the new store, where hundreds of guests milled about chatting, nibbling on hors d’oeuvres, and checking out muted-toned living room, dining room and bedroom furniture, while bartenders mixed drinks and a DJ played upbeat tunes.

Old Brookville resident Claire Nathel, 53, has been an RH customer for 15 years. She has b

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