The terraces were concreted in 1951 and Tynecastle became Scotland's first all-concrete stadium in 1954. Following the modernisation of the stadium, the club architects said that the capacity stood at 54,359, but for safety reasons only 49,000 tickets were printed and sold for big matches. Floodlights were installed at Tynecastle in 1957. A roof was constructed along part of the "distillery" side and in the north-west corner of the ground in 1959. This work was paid for by the sale of Dave Mackay for £32,000 to Tottenham Hotspur.