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The townhouses that formerly housed the Box Tree Restaurant and Inn have been demolished for a 20-story condominium apartment tower at 250 East 49th Street.

A rendering of the planned new building designed by Sydness Architects, PC., on the firm's website indicates that the 31-unit, mid-block tower will be cantilevered over the low-rise building immediately to its east and that the cantilevered portion of the new tower will be clad in gray tinted glass and supported by an asymmetrical array of struts while the north and south facades of the tower will have clear floor-to-ceiling windows with frosted glass balustrades in a random pattern across the front of the building.

According to the website, the building's apartments will range from one- to three-bedroom units and include one large duplex residence with no more than two apartments per floor. The tower has a setback at the 15th floor and a landscaped rooftop terrace for all residents.

Prior to forming Sydness Architects, K. Jeffries Sydness was a partner with John Burgee Architects, the successor firm to Johnson/Burgee Architects, which was founded by Philip Johnson and John Burgee.

A spokesman for the architect offered no details yesterday on the project nor the developer but said he would call back.

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Architecture Critic Carter Horsley Since 1997, Carter B. Horsley has been the editorial director of CityRealty. He began his journalistic career at The New York Times in 1961 where he spent 26 years as a reporter specializing in real estate & architectural news. In 1987, he became the architecture critic and real estate editor of The New York Post.