skyscraper in the Market East neighborhood in Center City, Philadelphia, Pennsylvania. Located at the corner of 12th and Market Streets, the skyscraper contains in the original building, with more space provided by a modern addition. The main building consists of a T-shaped tower and its base. The tower is split between the building's cross-bar that serves as the skyscraper's spine, and the rest of the tower which projects from the spine asymmetrically. The office floors are set back from 12th Street about and is set back on its western side about . The tower's facade is made up of vertical piers of limestone and horizontal spandrels of matte buff brick. The piers protrude outward from the rest of the facade. The facade of the core of the tower, which contains the elevators, stairwells, and utilities, is made of glazed black brick. The tower's windows are grouped in sets of four on the east and west sides of the tower. The north-side windows stretch across its entire length except for at the fourth and fifth floors where the windows are two sets of four flanking a set of six. The 21st floor, a mechanical floor that houses the air conditioning equipment, has narrower windows than on the rest of the building. The building's base is differentiated from the rest of the tower by a facade of polished granite and large windows. The base is wider than most of the tower above and is curved at the corner facing the Market Street and 12th Street intersection. The base housed the original banking hall and former retail space. Two-story-tall windows set in flat aluminum frames open into the banking hall area, curving with the rest of the base. Stainless steel rods make up the window mullions. Sign and tower The skyscraper is topped by a distinctive sign with the Philadelphia Saving Fund Society's initials. The high letters are white by day and illuminated with red neon lights by night. The sign hides mechanical equipment and can be seen for . The PSFS sign has become a Philadelphia icon. At the time of construction, abbreviations were rarely used but architects Howe and Lescaze pushed for their use as the full name would have been illegible from the ground. When Loews announced it was going to be converted into a hotel, the first question asked by reporters was what was happening to the sign. Loews