This classic Manhattan townhouse is situated on a street on the Upper East Side with a an uninterrupted row of identical mid-nineteenth century brownstones. This mid-block house was stylishly renovated in the 1920s by a society architect. We added a full floor addition above the fourth floor of the containing two bedrooms and a full bath, and access to a rooftop terrace. The appearance of the rooftop addition from the street is of a complexly curved pediment adorning a nineteenth century brownstone facade, and providing a vertical loft to the interior of the new bedroom that it adorns. To the elegantly designed 1920s renovated dining room on the garden level, we added a full width glass wall opening it to the garden while enhancing its early twentieth century design.