Premise: Buckingham Palace . During the 19th century it was enlarged , principally by architects John Nash and Edward Blore , who constructed three wings around a central courtyard . John Nash (architect) . His best-known buildings are the Royal Pavilion , Brighton , and Buckingham Palace ( though the facade facing The Mall is an early 20th-century remodelling by Aston Webb of an 1850s wing by Edward Blore , and thus is not Nash 's work ) . Marble Arch . The structure was designed by John Nash in 1827 to be the state entrance to the cour d'honneur of Buckingham Palace ; it stood near the site of what is today the three-bayed , central projection of the palace containing the well known balcony .
Hypothesis: John Nash designed Buckingham Palace.
Label: ENTAILMENT