Many an Upper East Side apartment boasts gracious rooms, decorator swag and grandeur to spare. This one-bedroom co-op at 18 East 84th Street in a prime spot just off Fifth Avenue has designer cred with cool, creative execution–and it doesn’t sacrifice a bit of grandeur. This enviable “penthouse” residence is on the top floor of a turn-of-the-century Georgian mansion with plenty of original historic details joining unique and stylish interiors; it’s currently asking $1.095 million.

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