name	city	years_as_tallest	metres	feet	floors
carlton centre	johannesburg	1973-01-01 - present	223.0	732	50
kwadukuza egoli hotel tower 1 , trust bank building	johannesburg	1970-01-01 - 1973-01-01	140.0	459	31
standard bank building	johannesburg	1968-01-01 - 1970-01-01	138.8	455	34
schlesinger building	johannesburg	9999-01-01	110.0	361	21
naspers centre	cape town	9999-01-01	93.0	205	22
mutual heights building	cape town	1940-01-01 - 1962-01-01	91.0	298	18
chamber of mines building	johannesburg	1936-01-01 - 1940-01-01	80.0	262	18
union buildings	pretoria	1913-01-01 - 1936-01-01	60.0	196	10

SELECT CASE WHEN COUNT(*) = 0 THEN 'FALSE' ELSE 'TRUE' END FROM table_sql WHERE name = 'carlton centre' AND city = 'johannesburg' AND floors = 50;