The commercial building in Changsha city caved in last Friday, prompting over six days of painstaking attempts to pull survivors free from the mass of rubble and twisted metal.
"The search and rescue work at the Changsha building collapse site has been completed," state broadcaster CCTV quoted city officials as saying.
"The trapped and incommunicado people from the accident scene have all been found... ten people were rescued and 53 people died."
The tenth person pulled alive from the rubble just after midnight on Thursday had been buried in debris for nearly six days, state media reported earlier.
Local official Wu Guiying apologised for the accident during the briefing, mentioning her "extreme distress" and "unparalleled self-blame", as well as offering a "sincere apology to society".
The toll from the collapse rose from twenty-six as of Thursday evening.
The block had contained apartments, a hotel and a cinema. The flattened structure, which has left a gaping hole in a dense Changsha streetscape, created a mess of debris and crumbled concrete beams.
