 Around 1709, during Burlington's minority, Lady Juliana Boyle, the second Countess, commissioned James Gibbs to reconfigure the staircase and make exterior alterations to the house, including a quadrant Doric colonnade which was later praised by Sir William Chambers as "one of the finest pieces of architecture".The colonnade separated the house from increasingly urbanized Piccadilly with a "cour d'honneur".Inside, Baroque decorative paintings in the entrance hall and a staircase by Sebastiano Ricci and Giovanni Antonio Pellegrini makes it one of the richest interiors in London.