name the restaurant that was in this building

there used to be a popular chinese/cantonese restaurant in this building. i ate there once or twice. i remember the old fashioned lift with a collapsible gate. i think the restaurant was then on the second or third floor.

(1) what was the name of the restaurant?

(2) where is its present location?

(3) what was the dish that it claimed to have 'invented' in 1964?

(4) who were the four culinary kings of singapore?