Mary-Kate and Ashley Olsen are selling their New York apartment for a $4.7 million profit.

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The 21-year-old Olsen twins have never even lived in the 12 room Greenwich Village property - which they bought in 1994 for $7.3 million - but have now put it on the market for $12 million.

The millionaire stars have been renting out the spectacular condo for $35,000 a month.

Real estate agent Charlotte Van Doren said, "The apartment has been rented, and has been continually rented since they first bought it."

The apartment's main feature is a 53ft-long entertainment space with a glass-enclosed fireplace in the centre.

Van Doren said, "It's very dramatic, very dramatic. You walk in and it's right there, bang."

The condo also boast views of the Hudson River from the living/dining room, the master bedroom, the master dressing room and the two other bedrooms.

It also has two separate 100sq ft walk-in closets.

Mary-Kate and Ashley - who in 2005 were estimated to have a combined net worth of $300 million - have a lucrative brand including their own fashion and accessories range, their own film series and successful acting and modeling careers.

Last week, Mary-Kate was admitted to hospital with a "kidney infection". She has since recovered and has been spotted dining out and shopping with Ashley in New York.

The twins began their career at just six-months-old playing the part of baby Michelle Tanner on US TV show "Full House".