 The State Apartments form the major part of the Upper Ward and lie along the north side of the quadrangle . The modern building follows the medieval foundations laid down by Edward III , with the ground floor comprising service chambers and cellars , and the much grander first floor forming the main part of the palace . On the first floor , the layout of the western end of the State Apartments is primarily the work of architect Hugh May , whereas the structure on the eastern side represents Jeffry Wyatville 's plans . 
