Question: Which house in London was destroyed by the Luftwaffe in 1940?

<P0-S0> Montagu House at 22 Portman Square was a historic London house. <P0-S1>  Occupying a site at the northwest corner of the square, in the angle between Gloucester Place and Upper Berkeley Street, it was built for Mrs Elizabeth Montagu, a wealthy widow and patroness of the arts, to the design of the neoclassicist architect James Stuart. <P0-S2>  Construction began in 1777 and the house was completed in 1781, whereupon it became Mrs Montagu's London residence until her death on 25 August 1800. <P0-S3>  The house was destroyed by an incendiary bomb in the Blitz of London and the site is now occupied by the Radisson SAS Portman Hotel. <SEP> <P1-S0> The Blitz was a German bombing offensive against Britain in 1940 and 1941, during the Second World War. <P1-S1>  The term was first used by the British press as an abbreviation of "Blitzkrieg" (lightning war). <P1-S2>  The Germans conducted mass air attacks against industrial targets, towns and cities, beginning with raids on London towards the end of the Battle of Britain in 1940, a battle for daylight air superiority between the "Luftwaffe" and the Royal Air Force over the United Kingdom. <P1-S3>  From 7 September 1940, London was systematically bombed by the "Luftwaffe" for 56 out of the following 57 days and nights. <P1-S4>  By September 1940, the "Luftwaffe" had failed and the German air fleets ("Luftflotten") were ordered to attack London, to draw RAF Fighter Command into a battle of annihilation. <P1-S5>  Adolf Hitler and "Reichsmarschall" Hermann Göring, commander-in-chief of the "Luftwaffe", ordered the new policy on 6 September 1940. <P1-S6>  Most notable was a large daylight attack against London on 15 September. <SEP> <P2-S0> The Municipal Theatre of Corfu (Greek: Δημοτικό Θέατρο Κέρκυρας ) was the main theatre and opera house in Corfu, Greece, from 1902 to 1943. <P2-S1>  The theatre was the successor of the Nobile Teatro di San Giacomo di Corfù, which became the Corfu city hall. <P2-S2>  It was destroyed during a Luftwaffe aerial bombardment in 1943. <P2-S3>  During its 41-year history it was one of the premier theatres and opera houses in Europe with contributions to the Arts and to the history of the Balkans. <SEP> <P3-S0> Old Devonshire House at 48 Boswell Street, was located between Theobald's Road in Bloomsbury, and Queen Square, London. <P3-S1>  William Cavendish, 3rd Earl of Devonshire had the house built in 1668 for his son, also called William Cavendish, who was MP for Derby at that time and eventually became 1st Duke of Devonshire in 1694. <P3-S2>  This house was later sold by William Cavendish, 3rd Duke of Devonshire, who built Devonshire House in fashionable Piccadilly. <P3-S3>  Major George Henry Benton Fletcher bought Old Devonshire House in 1932, to display his keyboard collection. <P3-S4>  He donated the house and his collection to the National Trust in November 1937. <P3-S5>  The house was destroyed in May 1941 by a Luftwaffe bombing raid on Holborn during the Blitz. <P3-S6>  Most of his keyboard instruments had been evacuated to Gloucestershire before the raid. <P3-S7>  These survived and are currently on display in Fenton House, Hampstead.