According to Manhattan-based developer Alchemy Properties, Inc., construction and sales have begun on its first Upper East Side ground-up residential development, The Isis Condominium.  Located at 303 East 77th St. in the heart of the Upper East Side, the boutique building will feature a striking cantilevered design and a unique mosaic facade. "The Isis Condominium will be an impressive, sophisticated, intimate and stylish addition to one of the most desirable and family-friendly neighborhoods in New York City," said Kenneth Horn, president of Alchemy Properties, Inc.  "It was designed with the New York family in mind; those seeking more spacious layouts, impeccable views, great value and luxurious design." When completed in July 2009, The Isis Condominium will contain 31 two, two-plus den and three-bedroom residences ranging in size from 1,205 s/f to 1,691 s/f.  The family-friendly building will feature a ground-level retail space, two spacious units on each floor and four penthouses, one of which is a four bedroom, 2,553 s/f unit with four private terraces and balconies totaling an additional 806 s/f.  Combination full-floor plans are available to create units as large as four bedrooms with dens.  Designed by FXFOWLE Architects, this 18-story new construction building will feature a cantilevered design resting on a six-story base, providing residents with views in all directions.