Savile Row was extended to Conduit Street in 1937–38, and by 1939, the Metropolitan Police Station was constructed on the corner of Boyle Street. This police station was damaged in another German bombing raid in September 1940, during which the building opposite, No. 21a, was destroyed, as was No. 7 earlier that month. Fortress House, an eight-storey block of offices faced with Portland stone, was constructed at 23 Savile Row in 1949-50 and occupied by a series of government ministries, ending with a long period of occupation by English Heritage until 2006. It was demolished in 2009 and replaced by a new mixed-use development designed by Eric Parry, Architects.