Clover Hotel / Royal Hotel / Chunghing Hotel, 380 Nathan Road [c.1957-c.1987]
Klaus found this information:
The book "Golden Guide to South and East Asia" from 1967 gives the following information: "Clover Hotel, (380 Nathan Rd., Tel. 846191, cable CLOVERTEL). 86 rooms, single 25$ up, double 35 up, suites 70 up. Chinese restaurant."
I've guessed the completion and demolition dates for the building were roughly the same as for the Astor Theatre, which was also on this site at the same time.
The hotel changed its name several times over the years - see Stanley's comment below.